Red Oak Weather Records (USC00136940)
Record envelope, standing records and threshold days for Red Oak (USC00136940), Iowa, United States, with 130 years of record.
Key Facts for Red Oak
- Red Oak (USC00136940) is a weather station in Iowa, United States at 41.00 latitude and -95.24 longitude, 317 m (1,040 ft) above sea level.
- The station reports from 1897 to 2026, 130 years of record.
- 1,464 records set at Red Oak still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Red Oak set a daily record precipitation of 50.8 mm (2.0 in) on 30 September 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: Iowa, United States, 41.00 latitude, -95.24 longitude.
- Elevation: 317 m (1,040 ft).
- Period of record: 1897 to 2026, 130 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
8 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 20.6 C (69.1 F) | -32.8 C (-27.0 F) | 18.9 C (66.0 F) | -22.8 C (-9.0 F) |
| Feb | 26.7 C (80.1 F) | -33.3 C (-27.9 F) | 22.8 C (73.0 F) | -20.0 C (-4.0 F) |
| Mar | 33.9 C (93.0 F) | -30.0 C (-22.0 F) | 33.9 C (93.0 F) | -14.4 C (6.1 F) |
| Apr | 34.4 C (93.9 F) | -16.7 C (1.9 F) | 31.1 C (88.0 F) | -0.6 C (30.9 F) |
| May | 38.3 C (100.9 F) | -3.3 C (26.1 F) | 31.7 C (89.1 F) | -1.7 C (28.9 F) |
| Jun | 40.0 C (104.0 F) | 1.1 C (34.0 F) | 33.3 C (91.9 F) | 10.0 C (50.0 F) |
| Jul | 42.8 C (109.0 F) | 3.9 C (39.0 F) | 37.2 C (99.0 F) | 14.4 C (57.9 F) |
| Aug | 41.1 C (106.0 F) | 1.1 C (34.0 F) | n/a | n/a |
| Sep | 39.4 C (102.9 F) | -5.0 C (23.0 F) | 21.7 C (71.1 F) | 18.9 C (66.0 F) |
| Oct | 35.0 C (95.0 F) | -10.6 C (12.9 F) | n/a | n/a |
| Nov | 27.8 C (82.0 F) | -25.6 C (-14.1 F) | n/a | n/a |
| Dec | 22.8 C (73.0 F) | -32.2 C (-26.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1897 | 15 |
| 1898 | 12 |
| 1899 | 33 |
| 1900 | 10 |
| 1901 | 16 |
| 1902 | 16 |
| 1903 | 13 |
| 1904 | 6 |
| 1905 | 18 |
| 1906 | 6 |
| 1938 | 20 |
| 1939 | 30 |
| 1940 | 23 |
| 1941 | 21 |
| 1942 | 14 |
| 1943 | 21 |
| 1944 | 19 |
| 1945 | 19 |
| 1946 | 22 |
| 1947 | 14 |
| 1948 | 14 |
| 1949 | 8 |
| 1950 | 23 |
| 1951 | 19 |
| 1952 | 18 |
| 1953 | 17 |
| 1954 | 13 |
| 1955 | 30 |
| 1956 | 12 |
| 1957 | 12 |
| 1958 | 7 |
| 1959 | 8 |
| 1960 | 12 |
| 1961 | 8 |
| 1962 | 23 |
| 1963 | 19 |
| 1964 | 17 |
| 1965 | 19 |
| 1966 | 18 |
| 1967 | 13 |
| 1968 | 15 |
| 1969 | 8 |
| 1970 | 12 |
| 1971 | 11 |
| 1972 | 16 |
| 1973 | 13 |
| 1974 | 22 |
| 1975 | 20 |
| 1976 | 18 |
| 1977 | 15 |
| 1978 | 8 |
| 1979 | 13 |
| 1980 | 20 |
| 1981 | 24 |
| 1982 | 13 |
| 1983 | 15 |
| 1984 | 12 |
| 1985 | 15 |
| 1986 | 13 |
| 1987 | 14 |
| 1988 | 19 |
| 1989 | 19 |
| 1990 | 15 |
| 1991 | 24 |
| 1992 | 12 |
| 1993 | 11 |
| 1994 | 6 |
| 1995 | 15 |
| 1996 | 6 |
| 1997 | 14 |
| 1998 | 17 |
| 1999 | 12 |
| 2000 | 21 |
| 2001 | 12 |
| 2002 | 13 |
| 2003 | 9 |
| 2004 | 13 |
| 2005 | 15 |
| 2006 | 13 |
| 2007 | 6 |
| 2008 | 6 |
| 2009 | 10 |
| 2010 | 9 |
| 2011 | 8 |
| 2012 | 18 |
| 2013 | 13 |
| 2014 | 15 |
| 2015 | 7 |
| 2016 | 10 |
| 2017 | 19 |
| 2018 | 22 |
| 2019 | 15 |
| 2020 | 14 |
| 2021 | 16 |
| 2022 | 15 |
| 2023 | 7 |
| 2024 | 9 |
| 2025 | 13 |
| 2026 | 11 |
All-Time Record Progression
7 new records| Date | Kind | Detail |
|---|---|---|
| 1974-01-12 | Record low minimum temperature | Record low minimum temperature -32.8 C (-27.0 F) |
| 1974-07-21 | Record high maximum temperature | Record high maximum temperature 42.8 C (109.0 F) |
| 1977-08-28 | Record daily precipitation | Record daily precipitation 175.3 mm (6.9 in) |
| 1987-08-25 | Record daily precipitation | Record daily precipitation 193.0 mm (7.6 in) |
| 1989-08-04 | Record high minimum temperature | Record high minimum temperature 27.2 C (81.0 F) |
| 1989-12-22 | Record low maximum temperature | Record low maximum temperature -23.3 C (-9.9 F) |
| 1996-02-03 | Record low minimum temperature | Record low minimum temperature -33.3 C (-27.9 F) |
Wettest Day of Each Month
Aug: 193.0 mm (7.6 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 33.0 mm (1.3 in) | 9 January 2026 |
| Feb | 59.2 mm (2.3 in) | 21 February 1976 |
| Mar | 61.7 mm (2.4 in) | 30 March 2012 |
| Apr | 143.5 mm (5.6 in) | 15 April 2012 |
| May | 165.1 mm (6.5 in) | 26 May 1987 |
| Jun | 151.1 mm (5.9 in) | 10 June 1967 |
| Jul | 152.9 mm (6.0 in) | 18 July 1902 |
| Aug | 193.0 mm (7.6 in) | 25 August 1987 |
| Sep | 138.4 mm (5.4 in) | 8 September 1989 |
| Oct | 125.5 mm (4.9 in) | 15 October 2007 |
| Nov | 93.7 mm (3.7 in) | 4 November 2003 |
| Dec | 59.2 mm (2.3 in) | 14 December 2015 |
Period of Record Coverage
1897 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1897 | 327 | 90% | No |
| 1898 | 304 | 83% | No |
| 1899 | 364 | 100% | Yes |
| 1900 | 362 | 99% | Yes |
| 1901 | 355 | 97% | Yes |
| 1902 | 363 | 99% | Yes |
| 1903 | 349 | 96% | Yes |
| 1904 | 364 | 99% | Yes |
| 1905 | 343 | 94% | Yes |
| 1906 | 149 | 41% | No |
| 1938 | 250 | 68% | No |
| 1939 | 362 | 99% | Yes |
| 1940 | 334 | 91% | Yes |
| 1941 | 365 | 100% | Yes |
| 1942 | 333 | 91% | Yes |
| 1943 | 365 | 100% | Yes |
| 1944 | 365 | 100% | Yes |
| 1945 | 364 | 100% | Yes |
| 1946 | 365 | 100% | Yes |
| 1947 | 363 | 99% | Yes |
| 1948 | 365 | 100% | Yes |
| 1949 | 365 | 100% | Yes |
| 1950 | 364 | 100% | Yes |
| 1951 | 365 | 100% | Yes |
| 1952 | 366 | 100% | Yes |
| 1953 | 364 | 100% | Yes |
| 1954 | 365 | 100% | Yes |
| 1955 | 365 | 100% | Yes |
| 1956 | 365 | 100% | Yes |
| 1957 | 364 | 100% | Yes |
| 1958 | 365 | 100% | Yes |
| 1959 | 365 | 100% | Yes |
| 1960 | 365 | 100% | Yes |
| 1961 | 365 | 100% | Yes |
| 1962 | 364 | 100% | Yes |
| 1963 | 365 | 100% | Yes |
| 1964 | 366 | 100% | Yes |
| 1965 | 365 | 100% | Yes |
| 1966 | 364 | 100% | Yes |
| 1967 | 365 | 100% | Yes |
| 1968 | 366 | 100% | Yes |
| 1969 | 333 | 91% | Yes |
| 1970 | 363 | 99% | Yes |
| 1971 | 360 | 99% | Yes |
| 1972 | 366 | 100% | Yes |
| 1973 | 363 | 99% | Yes |
| 1974 | 364 | 100% | Yes |
| 1975 | 364 | 100% | Yes |
| 1976 | 363 | 99% | Yes |
| 1977 | 362 | 99% | Yes |
| 1978 | 363 | 99% | Yes |
| 1979 | 362 | 99% | Yes |
| 1980 | 365 | 100% | Yes |
| 1981 | 362 | 99% | Yes |
| 1982 | 312 | 85% | No |
| 1983 | 331 | 91% | Yes |
| 1984 | 356 | 97% | Yes |
| 1985 | 354 | 97% | Yes |
| 1986 | 350 | 96% | Yes |
| 1987 | 348 | 95% | Yes |
| 1988 | 356 | 97% | Yes |
| 1989 | 361 | 99% | Yes |
| 1990 | 364 | 100% | Yes |
| 1991 | 360 | 99% | Yes |
| 1992 | 321 | 88% | No |
| 1993 | 310 | 85% | No |
| 1994 | 311 | 85% | No |
| 1995 | 309 | 85% | No |
| 1996 | 340 | 93% | Yes |
| 1997 | 360 | 99% | Yes |
| 1998 | 364 | 100% | Yes |
| 1999 | 365 | 100% | Yes |
| 2000 | 366 | 100% | Yes |
| 2001 | 365 | 100% | Yes |
| 2002 | 365 | 100% | Yes |
| 2003 | 365 | 100% | Yes |
| 2004 | 366 | 100% | Yes |
| 2005 | 365 | 100% | Yes |
| 2006 | 365 | 100% | Yes |
| 2007 | 365 | 100% | Yes |
| 2008 | 361 | 99% | Yes |
| 2009 | 364 | 100% | Yes |
| 2010 | 334 | 92% | Yes |
| 2011 | 365 | 100% | Yes |
| 2012 | 365 | 100% | Yes |
| 2013 | 365 | 100% | Yes |
| 2014 | 365 | 100% | Yes |
| 2015 | 365 | 100% | Yes |
| 2016 | 366 | 100% | Yes |
| 2017 | 365 | 100% | Yes |
| 2018 | 364 | 100% | Yes |
| 2019 | 314 | 86% | No |
| 2020 | 351 | 96% | Yes |
| 2021 | 363 | 99% | Yes |
| 2022 | 364 | 100% | Yes |
| 2023 | 362 | 99% | Yes |
| 2024 | 360 | 98% | Yes |
| 2025 | 349 | 96% | Yes |
| 2026 | 213 | 58% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 30 September 2026 | Red Oak, US | daily rain (Provisional) | 50.8 mm (2.0 in) | 1.5 mm (0.06 in) | 7 years | 12 of 100 (Routine) |
| 10 June 2026 | Red Oak, US | daily high min | 23.3 C (73.9 F) | 0.5 C (0.9 F) | 9 years | 13 of 100 (Routine) |
| 17 May 2026 | Red Oak, US | daily rain | 49.5 mm (1.9 in) | 8.6 mm (0.34 in) | 27 years | 23 of 100 (Routine) |
| 14 April 2026 | Red Oak, US | daily high min | 17.2 C (63.0 F) | 1.6 C (2.9 F) | 84 years | 37 of 100 (Notable) |
| 13 April 2026 | Red Oak, US | daily high min | 17.2 C (63.0 F) | 0.5 C (0.9 F) | 84 years | 35 of 100 (Notable) |
| 31 March 2026 | Red Oak, US | daily high max | 31.1 C (88.0 F) | 1.1 C (2.0 F) | 80 years | 35 of 100 (Notable) |
| 22 March 2026 | Red Oak, US | monthly high max | 33.9 C (93.0 F) | 1.1 C (2.0 F) | 39 years | 32 of 100 (Routine) |
| 21 March 2026 | Red Oak, US | daily high max | 30.0 C (86.0 F) | 3.9 C (7.0 F) | 87 years | 40 of 100 (Notable) |
| 20 March 2026 | Red Oak, US | daily high max | 26.7 C (80.1 F) | 1.7 C (3.1 F) | 8 years | 14 of 100 (Routine) |
| 6 March 2026 | Red Oak, US | daily rain | 20.3 mm (0.8 in) | 6.1 mm (0.24 in) | 43 years | 20 of 100 (Routine) |
| 17 February 2026 | Red Oak, US | daily high min (Tie) | 1.1 C (34.0 F) | tie | 44 years | 5 of 100 (Routine) |
| 16 February 2026 | Red Oak, US | daily high max | 18.9 C (66.0 F) | 0.6 C (1.1 F) | 64 years | 29 of 100 (Routine) |
| 15 February 2026 | Red Oak, US | daily high max (Tie) | 17.8 C (64.0 F) | tie | 20 years | 4 of 100 (Routine) |
| 10 February 2026 | Red Oak, US | daily high max | 22.8 C (73.0 F) | 6.1 C (11.0 F) | 16 years | 23 of 100 (Routine) |
| 24 January 2026 | Red Oak, US | daily low max | -17.2 C (1.0 F) | 3.3 C (5.9 F) | 23 years | 20 of 100 (Routine) |
| 9 January 2026 | Red Oak, US | monthly rain | 33.0 mm (1.3 in) | 5.1 mm (0.20 in) | 84 years | 54 of 100 (Notable) |
| 8 January 2026 | Red Oak, US | daily high max | 18.9 C (66.0 F) | 1.1 C (2.0 F) | 23 years | 17 of 100 (Routine) |
| 27 December 2025 | Red Oak, US | daily high min | 3.9 C (39.0 F) | 1.7 C (3.1 F) | 7 years | 14 of 100 (Routine) |
| 25 December 2025 | Red Oak, US | daily high min | 6.1 C (43.0 F) | 3.9 C (7.0 F) | 6 years | 17 of 100 (Routine) |
| 24 December 2025 | Red Oak, US | daily high max | 13.9 C (57.0 F) | 0.6 C (1.1 F) | 2 years | 10 of 100 (Routine) |
Climate Trend
84 complete years, 1899 to 2024| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1899 | 10.8 C | +0.23 C |
| 1900 | 11.7 C | +1.18 C |
| 1901 | 10.8 C | +0.21 C |
| 1902 | 10.3 C | -0.23 C |
| 1904 | 9.7 C | -0.82 C |
| 1905 | 10.6 C | +0.02 C |
| 1939 | 11.2 C | +0.62 C |
| 1941 | 11.5 C | +0.91 C |
| 1943 | 9.9 C | -0.66 C |
| 1944 | 10.1 C | -0.42 C |
| 1945 | 9.5 C | -1.05 C |
| 1946 | 11.3 C | +0.75 C |
| 1947 | 10.2 C | -0.30 C |
| 1948 | 10.1 C | -0.49 C |
| 1949 | 10.0 C | -0.59 C |
| 1950 | 8.7 C | -1.87 C |
| 1951 | 8.9 C | -1.65 C |
| 1952 | 10.6 C | +0.02 C |
| 1953 | 11.7 C | +1.16 C |
| 1954 | 11.9 C | +1.38 C |
| 1955 | 10.7 C | +0.18 C |
| 1956 | 11.3 C | +0.72 C |
| 1957 | 10.5 C | -0.05 C |
| 1958 | 10.2 C | -0.39 C |
| 1959 | 10.3 C | -0.29 C |
| 1960 | 9.5 C | -1.01 C |
| 1961 | 9.8 C | -0.75 C |
| 1962 | 10.1 C | -0.43 C |
| 1963 | 10.9 C | +0.39 C |
| 1964 | 11.1 C | +0.57 C |
| 1965 | 10.3 C | -0.22 C |
| 1966 | 10.0 C | -0.51 C |
| 1967 | 10.2 C | -0.34 C |
| 1968 | 10.6 C | +0.08 C |
| 1970 | 10.7 C | +0.14 C |
| 1971 | 10.8 C | +0.29 C |
| 1972 | 10.3 C | -0.26 C |
| 1973 | 11.5 C | +0.97 C |
| 1974 | 11.3 C | +0.80 C |
| 1975 | 10.6 C | +0.08 C |
| 1976 | 10.4 C | -0.15 C |
| 1977 | 10.6 C | +0.07 C |
| 1978 | 8.8 C | -1.73 C |
| 1979 | 8.9 C | -1.69 C |
| 1980 | 10.5 C | -0.03 C |
| 1981 | 10.5 C | -0.09 C |
| 1984 | 10.8 C | +0.22 C |
| 1985 | 9.8 C | -0.76 C |
| 1986 | 11.1 C | +0.51 C |
| 1987 | 11.8 C | +1.28 C |
| 1988 | 11.6 C | +1.03 C |
| 1989 | 10.3 C | -0.21 C |
| 1990 | 11.7 C | +1.14 C |
| 1991 | 11.1 C | +0.60 C |
| 1992 | 10.9 C | +0.39 C |
| 1993 | 9.5 C | -1.06 C |
| 1994 | 11.0 C | +0.47 C |
| 1996 | 9.6 C | -0.99 C |
| 1997 | 9.8 C | -0.76 C |
| 1998 | 11.2 C | +0.65 C |
| 1999 | 10.5 C | -0.04 C |
| 2000 | 10.5 C | -0.09 C |
| 2001 | 10.9 C | +0.34 C |
| 2002 | 10.7 C | +0.20 C |
| 2003 | 10.2 C | -0.30 C |
| 2004 | 10.5 C | -0.08 C |
| 2005 | 11.1 C | +0.57 C |
| 2006 | 11.5 C | +0.99 C |
| 2007 | 10.7 C | +0.17 C |
| 2008 | 9.2 C | -1.30 C |
| 2009 | 9.4 C | -1.12 C |
| 2011 | 10.4 C | -0.17 C |
| 2012 | 12.4 C | +1.84 C |
| 2013 | 9.6 C | -0.97 C |
| 2014 | 9.3 C | -1.23 C |
| 2015 | 11.0 C | +0.41 C |
| 2016 | 11.9 C | +1.33 C |
| 2017 | 11.5 C | +0.91 C |
| 2018 | 9.9 C | -0.64 C |
| 2020 | 10.9 C | +0.32 C |
| 2021 | 11.1 C | +0.54 C |
| 2022 | 9.9 C | -0.69 C |
| 2023 | 11.4 C | +0.87 C |
| 2024 | 11.8 C | +1.26 C |
The fitted trend in annual mean temperature here over 1899 to 2024 is 0.02 C (-0.03 to 0.08) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.04 F (-0.06 to 0.14) per decade. The slope is a straight line fitted to 84 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.02 C (-0.03 to 0.08) per decade | 0.04 F (-0.06 to 0.14) per decade | 1899 to 2024 | 84 | Not clearly different from zero |
| Mean daily maximum | 0.06 C (-0.01 to 0.13) per decade | 0.10 F (-0.03 to 0.23) per decade | 1899 to 2024 | 84 | Not clearly different from zero |
| Mean daily minimum | -0.01 C (-0.07 to 0.04) per decade | -0.02 F (-0.13 to 0.08) per decade | 1899 to 2024 | 84 | Not clearly different from zero |
A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.
Extremes by Year
1897 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 42.8 C (109.0 F) | 1974 | 36.7 C (98.1 F) | 99 |
| Coldest night (TNn) | -33.3 C (-27.9 F) | 1996 | -26.7 C (-16.1 F) | 99 |
| Wettest day (Rx1day) | 193.0 mm (7.6 in) | 1987 | 69.2 mm (2.7 in) | 112 |
| Wettest five days (Rx5day) | 288.3 mm (11.4 in) | 1977 | 99.7 mm (3.9 in) | 112 |
| Longest dry spell (CDD) | 81 days | 1927 | 28 days | 112 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1897 | 37.8 C (100.0 F) |
| 1898 | 37.2 C (99.0 F) |
| 1899 | 37.8 C (100.0 F) |
| 1900 | 36.7 C (98.1 F) |
| 1901 | 38.3 C (100.9 F) |
| 1902 | 32.2 C (90.0 F) |
| 1903 | 34.4 C (93.9 F) |
| 1904 | 31.7 C (89.1 F) |
| 1905 | 37.8 C (100.0 F) |
| 1906 | 30.6 C (87.1 F) |
| 1924 | n/a |
| 1925 | n/a |
| 1926 | n/a |
| 1927 | n/a |
| 1928 | n/a |
| 1929 | n/a |
| 1930 | n/a |
| 1931 | n/a |
| 1932 | n/a |
| 1933 | n/a |
| 1934 | n/a |
| 1935 | n/a |
| 1936 | n/a |
| 1938 | 40.0 C (104.0 F) |
| 1939 | 41.1 C (106.0 F) |
| 1940 | 42.2 C (108.0 F) |
| 1941 | 38.9 C (102.0 F) |
| 1942 | 37.2 C (99.0 F) |
| 1943 | 36.7 C (98.1 F) |
| 1944 | 36.7 C (98.1 F) |
| 1945 | 36.7 C (98.1 F) |
| 1946 | 40.0 C (104.0 F) |
| 1947 | 38.3 C (100.9 F) |
| 1948 | 36.1 C (97.0 F) |
| 1949 | 35.6 C (96.1 F) |
| 1950 | 35.0 C (95.0 F) |
| 1951 | 36.7 C (98.1 F) |
| 1952 | 39.4 C (102.9 F) |
| 1953 | 39.4 C (102.9 F) |
| 1954 | 42.2 C (108.0 F) |
| 1955 | 41.1 C (106.0 F) |
| 1956 | 40.6 C (105.1 F) |
| 1957 | 40.0 C (104.0 F) |
| 1958 | 35.6 C (96.1 F) |
| 1959 | 35.6 C (96.1 F) |
| 1960 | 36.1 C (97.0 F) |
| 1961 | 36.7 C (98.1 F) |
| 1962 | 36.1 C (97.0 F) |
| 1963 | 38.9 C (102.0 F) |
| 1964 | 40.0 C (104.0 F) |
| 1965 | 36.1 C (97.0 F) |
| 1966 | 38.9 C (102.0 F) |
| 1967 | 37.2 C (99.0 F) |
| 1968 | 37.8 C (100.0 F) |
| 1969 | 36.1 C (97.0 F) |
| 1970 | 37.2 C (99.0 F) |
| 1971 | 37.2 C (99.0 F) |
| 1972 | 37.2 C (99.0 F) |
| 1973 | 36.7 C (98.1 F) |
| 1974 | 42.8 C (109.0 F) |
| 1975 | 38.3 C (100.9 F) |
| 1976 | 36.7 C (98.1 F) |
| 1977 | 37.2 C (99.0 F) |
| 1978 | 37.2 C (99.0 F) |
| 1979 | 36.7 C (98.1 F) |
| 1980 | 40.0 C (104.0 F) |
| 1981 | 37.8 C (100.0 F) |
| 1982 | 36.7 C (98.1 F) |
| 1983 | 39.4 C (102.9 F) |
| 1984 | 38.9 C (102.0 F) |
| 1985 | 39.4 C (102.9 F) |
| 1986 | 35.6 C (96.1 F) |
| 1987 | 38.3 C (100.9 F) |
| 1988 | 41.1 C (106.0 F) |
| 1989 | 37.2 C (99.0 F) |
| 1990 | 38.9 C (102.0 F) |
| 1991 | 35.6 C (96.1 F) |
| 1992 | 32.8 C (91.0 F) |
| 1993 | 34.4 C (93.9 F) |
| 1994 | 35.6 C (96.1 F) |
| 1995 | 38.9 C (102.0 F) |
| 1996 | 35.6 C (96.1 F) |
| 1997 | 35.0 C (95.0 F) |
| 1998 | 35.6 C (96.1 F) |
| 1999 | 36.1 C (97.0 F) |
| 2000 | 37.2 C (99.0 F) |
| 2001 | 36.7 C (98.1 F) |
| 2002 | 38.3 C (100.9 F) |
| 2003 | 38.9 C (102.0 F) |
| 2004 | 33.9 C (93.0 F) |
| 2005 | 36.1 C (97.0 F) |
| 2006 | 38.3 C (100.9 F) |
| 2007 | 35.6 C (96.1 F) |
| 2008 | 36.1 C (97.0 F) |
| 2009 | 36.1 C (97.0 F) |
| 2010 | 34.4 C (93.9 F) |
| 2011 | 36.7 C (98.1 F) |
| 2012 | 39.4 C (102.9 F) |
| 2013 | 36.7 C (98.1 F) |
| 2014 | 35.6 C (96.1 F) |
| 2015 | 36.1 C (97.0 F) |
| 2016 | 36.7 C (98.1 F) |
| 2017 | 35.6 C (96.1 F) |
| 2018 | 38.3 C (100.9 F) |
| 2019 | 35.0 C (95.0 F) |
| 2020 | 35.0 C (95.0 F) |
| 2021 | 37.2 C (99.0 F) |
| 2022 | 36.7 C (98.1 F) |
| 2023 | 37.2 C (99.0 F) |
| 2024 | 36.1 C (97.0 F) |
| 2025 | 35.6 C (96.1 F) |
| 2026 | 37.2 C (99.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1897 | -27.2 C (-17.0 F) |
| 1898 | -21.7 C (-7.1 F) |
| 1899 | -31.7 C (-25.1 F) |
| 1900 | -22.8 C (-9.0 F) |
| 1901 | -25.0 C (-13.0 F) |
| 1902 | -26.1 C (-15.0 F) |
| 1903 | -23.3 C (-9.9 F) |
| 1904 | -25.6 C (-14.1 F) |
| 1905 | -32.2 C (-26.0 F) |
| 1906 | -18.9 C (-2.0 F) |
| 1924 | n/a |
| 1925 | n/a |
| 1926 | n/a |
| 1927 | n/a |
| 1928 | n/a |
| 1929 | n/a |
| 1930 | n/a |
| 1931 | n/a |
| 1932 | n/a |
| 1933 | n/a |
| 1934 | n/a |
| 1935 | n/a |
| 1936 | n/a |
| 1938 | -18.3 C (-0.9 F) |
| 1939 | -23.9 C (-11.0 F) |
| 1940 | -30.6 C (-23.1 F) |
| 1941 | -17.8 C (0.0 F) |
| 1942 | -30.6 C (-23.1 F) |
| 1943 | -30.6 C (-23.1 F) |
| 1944 | -30.6 C (-23.1 F) |
| 1945 | -30.0 C (-22.0 F) |
| 1946 | -25.0 C (-13.0 F) |
| 1947 | -31.1 C (-24.0 F) |
| 1948 | -30.0 C (-22.0 F) |
| 1949 | -25.6 C (-14.1 F) |
| 1950 | -29.4 C (-20.9 F) |
| 1951 | -26.7 C (-16.1 F) |
| 1952 | -21.1 C (-6.0 F) |
| 1953 | -23.3 C (-9.9 F) |
| 1954 | -24.4 C (-11.9 F) |
| 1955 | -26.1 C (-15.0 F) |
| 1956 | -26.1 C (-15.0 F) |
| 1957 | -27.2 C (-17.0 F) |
| 1958 | -29.4 C (-20.9 F) |
| 1959 | -26.7 C (-16.1 F) |
| 1960 | -29.4 C (-20.9 F) |
| 1961 | -26.7 C (-16.1 F) |
| 1962 | -28.9 C (-20.0 F) |
| 1963 | -28.3 C (-18.9 F) |
| 1964 | -25.6 C (-14.1 F) |
| 1965 | -26.7 C (-16.1 F) |
| 1966 | -28.9 C (-20.0 F) |
| 1967 | -23.9 C (-11.0 F) |
| 1968 | -28.9 C (-20.0 F) |
| 1969 | -20.6 C (-5.1 F) |
| 1970 | -27.2 C (-17.0 F) |
| 1971 | -31.7 C (-25.1 F) |
| 1972 | -26.1 C (-15.0 F) |
| 1973 | -25.0 C (-13.0 F) |
| 1974 | -32.8 C (-27.0 F) |
| 1975 | -30.6 C (-23.1 F) |
| 1976 | -27.2 C (-17.0 F) |
| 1977 | -30.6 C (-23.1 F) |
| 1978 | -27.8 C (-18.0 F) |
| 1979 | -30.6 C (-23.1 F) |
| 1980 | -25.0 C (-13.0 F) |
| 1981 | -30.6 C (-23.1 F) |
| 1982 | -32.2 C (-26.0 F) |
| 1983 | -22.8 C (-9.0 F) |
| 1984 | -26.7 C (-16.1 F) |
| 1985 | -27.8 C (-18.0 F) |
| 1986 | -24.4 C (-11.9 F) |
| 1987 | -19.4 C (-2.9 F) |
| 1988 | -27.2 C (-17.0 F) |
| 1989 | -32.2 C (-26.0 F) |
| 1990 | -23.9 C (-11.0 F) |
| 1991 | -25.6 C (-14.1 F) |
| 1992 | -20.6 C (-5.1 F) |
| 1993 | -21.1 C (-6.0 F) |
| 1994 | -23.9 C (-11.0 F) |
| 1995 | -25.0 C (-13.0 F) |
| 1996 | -33.3 C (-27.9 F) |
| 1997 | -26.7 C (-16.1 F) |
| 1998 | -28.3 C (-18.9 F) |
| 1999 | -29.4 C (-20.9 F) |
| 2000 | -26.7 C (-16.1 F) |
| 2001 | -26.7 C (-16.1 F) |
| 2002 | -21.1 C (-6.0 F) |
| 2003 | -23.9 C (-11.0 F) |
| 2004 | -24.4 C (-11.9 F) |
| 2005 | -24.4 C (-11.9 F) |
| 2006 | -21.1 C (-6.0 F) |
| 2007 | -25.0 C (-13.0 F) |
| 2008 | -26.1 C (-15.0 F) |
| 2009 | -26.7 C (-16.1 F) |
| 2010 | -30.6 C (-23.1 F) |
| 2011 | -24.4 C (-11.9 F) |
| 2012 | -21.1 C (-6.0 F) |
| 2013 | -26.1 C (-15.0 F) |
| 2014 | -26.1 C (-15.0 F) |
| 2015 | -26.7 C (-16.1 F) |
| 2016 | -25.6 C (-14.1 F) |
| 2017 | -26.1 C (-15.0 F) |
| 2018 | -28.9 C (-20.0 F) |
| 2019 | -29.4 C (-20.9 F) |
| 2020 | -21.7 C (-7.1 F) |
| 2021 | -31.7 C (-25.1 F) |
| 2022 | -25.0 C (-13.0 F) |
| 2023 | -21.1 C (-6.0 F) |
| 2024 | -29.4 C (-20.9 F) |
| 2025 | -26.7 C (-16.1 F) |
| 2026 | -22.8 C (-9.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1897 | 63.5 mm (2.5 in) |
| 1898 | 42.4 mm (1.7 in) |
| 1899 | 75.7 mm (3.0 in) |
| 1900 | 66.0 mm (2.6 in) |
| 1901 | 53.3 mm (2.1 in) |
| 1902 | 152.9 mm (6.0 in) |
| 1903 | 156.0 mm (6.1 in) |
| 1904 | 49.8 mm (2.0 in) |
| 1905 | 55.9 mm (2.2 in) |
| 1906 | 26.4 mm (1.0 in) |
| 1924 | 31.8 mm (1.3 in) |
| 1925 | 67.3 mm (2.6 in) |
| 1926 | 94.0 mm (3.7 in) |
| 1927 | 46.5 mm (1.8 in) |
| 1928 | 95.3 mm (3.8 in) |
| 1929 | 63.5 mm (2.5 in) |
| 1930 | 44.5 mm (1.8 in) |
| 1931 | 76.2 mm (3.0 in) |
| 1932 | 70.6 mm (2.8 in) |
| 1933 | 57.2 mm (2.3 in) |
| 1934 | 39.4 mm (1.6 in) |
| 1935 | 88.4 mm (3.5 in) |
| 1936 | 57.4 mm (2.3 in) |
| 1938 | 71.9 mm (2.8 in) |
| 1939 | 53.8 mm (2.1 in) |
| 1940 | 30.0 mm (1.2 in) |
| 1941 | 121.2 mm (4.8 in) |
| 1942 | 61.0 mm (2.4 in) |
| 1943 | 79.8 mm (3.1 in) |
| 1944 | 50.5 mm (2.0 in) |
| 1945 | 52.6 mm (2.1 in) |
| 1946 | 104.9 mm (4.1 in) |
| 1947 | 103.1 mm (4.1 in) |
| 1948 | 78.0 mm (3.1 in) |
| 1949 | 51.3 mm (2.0 in) |
| 1950 | 86.6 mm (3.4 in) |
| 1951 | 44.5 mm (1.8 in) |
| 1952 | 71.1 mm (2.8 in) |
| 1953 | 34.0 mm (1.3 in) |
| 1954 | 51.3 mm (2.0 in) |
| 1955 | 81.0 mm (3.2 in) |
| 1956 | 91.4 mm (3.6 in) |
| 1957 | 40.9 mm (1.6 in) |
| 1958 | 91.9 mm (3.6 in) |
| 1959 | 36.8 mm (1.4 in) |
| 1960 | 102.4 mm (4.0 in) |
| 1961 | 74.4 mm (2.9 in) |
| 1962 | 94.7 mm (3.7 in) |
| 1963 | 37.1 mm (1.5 in) |
| 1964 | 99.6 mm (3.9 in) |
| 1965 | 101.9 mm (4.0 in) |
| 1966 | 66.0 mm (2.6 in) |
| 1967 | 151.1 mm (5.9 in) |
| 1968 | 38.4 mm (1.5 in) |
| 1969 | 66.0 mm (2.6 in) |
| 1970 | 52.8 mm (2.1 in) |
| 1971 | 63.5 mm (2.5 in) |
| 1972 | 94.5 mm (3.7 in) |
| 1973 | 73.7 mm (2.9 in) |
| 1974 | 61.5 mm (2.4 in) |
| 1975 | 67.1 mm (2.6 in) |
| 1976 | 80.0 mm (3.1 in) |
| 1977 | 175.3 mm (6.9 in) |
| 1978 | 64.8 mm (2.6 in) |
| 1979 | 63.0 mm (2.5 in) |
| 1980 | 74.7 mm (2.9 in) |
| 1981 | 47.2 mm (1.9 in) |
| 1982 | 99.6 mm (3.9 in) |
| 1983 | 56.4 mm (2.2 in) |
| 1984 | 67.8 mm (2.7 in) |
| 1985 | 73.7 mm (2.9 in) |
| 1986 | 95.3 mm (3.8 in) |
| 1987 | 193.0 mm (7.6 in) |
| 1988 | 64.0 mm (2.5 in) |
| 1989 | 138.4 mm (5.4 in) |
| 1990 | 120.7 mm (4.8 in) |
| 1991 | 74.9 mm (2.9 in) |
| 1992 | 58.9 mm (2.3 in) |
| 1993 | 62.2 mm (2.4 in) |
| 1994 | 47.8 mm (1.9 in) |
| 1995 | 66.8 mm (2.6 in) |
| 1996 | 103.4 mm (4.1 in) |
| 1997 | 81.8 mm (3.2 in) |
| 1998 | 73.2 mm (2.9 in) |
| 1999 | 90.9 mm (3.6 in) |
| 2000 | 39.6 mm (1.6 in) |
| 2001 | 72.1 mm (2.8 in) |
| 2002 | 71.6 mm (2.8 in) |
| 2003 | 93.7 mm (3.7 in) |
| 2004 | 70.6 mm (2.8 in) |
| 2005 | 38.4 mm (1.5 in) |
| 2006 | 49.3 mm (1.9 in) |
| 2007 | 125.5 mm (4.9 in) |
| 2008 | 128.0 mm (5.0 in) |
| 2009 | 62.0 mm (2.4 in) |
| 2010 | 52.3 mm (2.1 in) |
| 2011 | 83.1 mm (3.3 in) |
| 2012 | 143.5 mm (5.6 in) |
| 2013 | 65.5 mm (2.6 in) |
| 2014 | 103.1 mm (4.1 in) |
| 2015 | 63.5 mm (2.5 in) |
| 2016 | 94.7 mm (3.7 in) |
| 2017 | 86.1 mm (3.4 in) |
| 2018 | 87.4 mm (3.4 in) |
| 2019 | 111.3 mm (4.4 in) |
| 2020 | 40.6 mm (1.6 in) |
| 2021 | 72.1 mm (2.8 in) |
| 2022 | 35.6 mm (1.4 in) |
| 2023 | 48.3 mm (1.9 in) |
| 2024 | 63.5 mm (2.5 in) |
| 2025 | 63.5 mm (2.5 in) |
| 2026 | 81.3 mm (3.2 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1897 | 106.2 mm (4.2 in) |
| 1898 | 88.2 mm (3.5 in) |
| 1899 | 99.0 mm (3.9 in) |
| 1900 | 87.6 mm (3.4 in) |
| 1901 | 72.4 mm (2.9 in) |
| 1902 | 162.6 mm (6.4 in) |
| 1903 | 187.2 mm (7.4 in) |
| 1904 | 69.8 mm (2.7 in) |
| 1905 | 118.6 mm (4.7 in) |
| 1906 | 38.1 mm (1.5 in) |
| 1924 | 47.3 mm (1.9 in) |
| 1925 | 87.1 mm (3.4 in) |
| 1926 | 189.7 mm (7.5 in) |
| 1927 | 89.9 mm (3.5 in) |
| 1928 | 142.5 mm (5.6 in) |
| 1929 | 91.7 mm (3.6 in) |
| 1930 | 72.7 mm (2.9 in) |
| 1931 | 89.9 mm (3.5 in) |
| 1932 | 125.5 mm (4.9 in) |
| 1933 | 101.7 mm (4.0 in) |
| 1934 | 85.7 mm (3.4 in) |
| 1935 | 93.7 mm (3.7 in) |
| 1936 | 77.4 mm (3.0 in) |
| 1938 | 87.1 mm (3.4 in) |
| 1939 | 110.2 mm (4.3 in) |
| 1940 | 53.6 mm (2.1 in) |
| 1941 | 180.8 mm (7.1 in) |
| 1942 | 65.1 mm (2.6 in) |
| 1943 | 85.7 mm (3.4 in) |
| 1944 | 80.2 mm (3.2 in) |
| 1945 | 76.0 mm (3.0 in) |
| 1946 | 154.5 mm (6.1 in) |
| 1947 | 120.4 mm (4.7 in) |
| 1948 | 90.4 mm (3.6 in) |
| 1949 | 57.4 mm (2.3 in) |
| 1950 | 129.2 mm (5.1 in) |
| 1951 | 97.0 mm (3.8 in) |
| 1952 | 94.5 mm (3.7 in) |
| 1953 | 65.3 mm (2.6 in) |
| 1954 | 121.9 mm (4.8 in) |
| 1955 | 81.3 mm (3.2 in) |
| 1956 | 105.6 mm (4.2 in) |
| 1957 | 71.1 mm (2.8 in) |
| 1958 | 112.0 mm (4.4 in) |
| 1959 | 88.2 mm (3.5 in) |
| 1960 | 113.6 mm (4.5 in) |
| 1961 | 124.2 mm (4.9 in) |
| 1962 | 128.7 mm (5.1 in) |
| 1963 | 61.1 mm (2.4 in) |
| 1964 | 160.3 mm (6.3 in) |
| 1965 | 130.6 mm (5.1 in) |
| 1966 | 93.9 mm (3.7 in) |
| 1967 | 273.7 mm (10.8 in) |
| 1968 | 65.3 mm (2.6 in) |
| 1969 | 101.6 mm (4.0 in) |
| 1970 | 92.2 mm (3.6 in) |
| 1971 | 89.4 mm (3.5 in) |
| 1972 | 172.8 mm (6.8 in) |
| 1973 | 95.0 mm (3.7 in) |
| 1974 | 88.5 mm (3.5 in) |
| 1975 | 119.7 mm (4.7 in) |
| 1976 | 107.1 mm (4.2 in) |
| 1977 | 288.3 mm (11.4 in) |
| 1978 | 119.0 mm (4.7 in) |
| 1979 | 74.2 mm (2.9 in) |
| 1980 | 148.8 mm (5.9 in) |
| 1981 | 106.1 mm (4.2 in) |
| 1982 | 104.0 mm (4.1 in) |
| 1983 | 81.5 mm (3.2 in) |
| 1984 | 104.4 mm (4.1 in) |
| 1985 | 73.7 mm (2.9 in) |
| 1986 | 131.1 mm (5.2 in) |
| 1987 | 231.8 mm (9.1 in) |
| 1988 | 88.6 mm (3.5 in) |
| 1989 | 192.5 mm (7.6 in) |
| 1990 | 152.2 mm (6.0 in) |
| 1991 | 77.5 mm (3.1 in) |
| 1992 | 81.3 mm (3.2 in) |
| 1993 | 112.5 mm (4.4 in) |
| 1994 | 87.5 mm (3.4 in) |
| 1995 | 136.2 mm (5.4 in) |
| 1996 | 189.5 mm (7.5 in) |
| 1997 | 88.7 mm (3.5 in) |
| 1998 | 125.3 mm (4.9 in) |
| 1999 | 115.3 mm (4.5 in) |
| 2000 | 73.9 mm (2.9 in) |
| 2001 | 98.3 mm (3.9 in) |
| 2002 | 100.3 mm (3.9 in) |
| 2003 | 130.5 mm (5.1 in) |
| 2004 | 91.6 mm (3.6 in) |
| 2005 | 105.1 mm (4.1 in) |
| 2006 | 92.5 mm (3.6 in) |
| 2007 | 172.4 mm (6.8 in) |
| 2008 | 203.7 mm (8.0 in) |
| 2009 | 70.9 mm (2.8 in) |
| 2010 | 88.2 mm (3.5 in) |
| 2011 | 92.0 mm (3.6 in) |
| 2012 | 168.2 mm (6.6 in) |
| 2013 | 160.3 mm (6.3 in) |
| 2014 | 164.4 mm (6.5 in) |
| 2015 | 131.8 mm (5.2 in) |
| 2016 | 130.8 mm (5.1 in) |
| 2017 | 139.9 mm (5.5 in) |
| 2018 | 105.9 mm (4.2 in) |
| 2019 | 146.2 mm (5.8 in) |
| 2020 | 72.6 mm (2.9 in) |
| 2021 | 140.4 mm (5.5 in) |
| 2022 | 74.8 mm (2.9 in) |
| 2023 | 64.7 mm (2.5 in) |
| 2024 | 90.3 mm (3.6 in) |
| 2025 | 76.2 mm (3.0 in) |
| 2026 | 100.4 mm (4.0 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1897 | 28 days |
| 1898 | 28 days |
| 1899 | 16 days |
| 1900 | 21 days |
| 1901 | 28 days |
| 1902 | 19 days |
| 1903 | 24 days |
| 1904 | 30 days |
| 1905 | 29 days |
| 1906 | 28 days |
| 1924 | 28 days |
| 1925 | 36 days |
| 1926 | 22 days |
| 1927 | 81 days |
| 1928 | 18 days |
| 1929 | 25 days |
| 1930 | 30 days |
| 1931 | 29 days |
| 1932 | 28 days |
| 1933 | 28 days |
| 1934 | 35 days |
| 1935 | 24 days |
| 1936 | 33 days |
| 1938 | 47 days |
| 1939 | 37 days |
| 1940 | 16 days |
| 1941 | 22 days |
| 1942 | 35 days |
| 1943 | 30 days |
| 1944 | 25 days |
| 1945 | 24 days |
| 1946 | 41 days |
| 1947 | 26 days |
| 1948 | 21 days |
| 1949 | 26 days |
| 1950 | 26 days |
| 1951 | 17 days |
| 1952 | 55 days |
| 1953 | 24 days |
| 1954 | 49 days |
| 1955 | 28 days |
| 1956 | 37 days |
| 1957 | 27 days |
| 1958 | 32 days |
| 1959 | 18 days |
| 1960 | 29 days |
| 1961 | 23 days |
| 1962 | 21 days |
| 1963 | 28 days |
| 1964 | 23 days |
| 1965 | 21 days |
| 1966 | 26 days |
| 1967 | 36 days |
| 1968 | 26 days |
| 1969 | 25 days |
| 1970 | 27 days |
| 1971 | 25 days |
| 1972 | 18 days |
| 1973 | 28 days |
| 1974 | 19 days |
| 1975 | 30 days |
| 1976 | 38 days |
| 1977 | 26 days |
| 1978 | 23 days |
| 1979 | 35 days |
| 1980 | 28 days |
| 1981 | 31 days |
| 1982 | 18 days |
| 1983 | 28 days |
| 1984 | 33 days |
| 1985 | 22 days |
| 1986 | 33 days |
| 1987 | 28 days |
| 1988 | 33 days |
| 1989 | 28 days |
| 1990 | 20 days |
| 1991 | 23 days |
| 1992 | 23 days |
| 1993 | 20 days |
| 1994 | 25 days |
| 1995 | 23 days |
| 1996 | 21 days |
| 1997 | 25 days |
| 1998 | 23 days |
| 1999 | 25 days |
| 2000 | 28 days |
| 2001 | 23 days |
| 2002 | 56 days |
| 2003 | 23 days |
| 2004 | 25 days |
| 2005 | 30 days |
| 2006 | 33 days |
| 2007 | 30 days |
| 2008 | 33 days |
| 2009 | 19 days |
| 2010 | 26 days |
| 2011 | 21 days |
| 2012 | 29 days |
| 2013 | 22 days |
| 2014 | 34 days |
| 2015 | 47 days |
| 2016 | 35 days |
| 2017 | 29 days |
| 2018 | 23 days |
| 2019 | 19 days |
| 2020 | 28 days |
| 2021 | 34 days |
| 2022 | 26 days |
| 2023 | 27 days |
| 2024 | 48 days |
| 2025 | 42 days |
| 2026 | 41 days |
Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.
Frost Dates and Growing Season
84 years with a frostAcross 84 years with a frost, the median last spring frost at Red Oak falls on 27 April and the median first autumn frost on 6 October, which leaves a median of 162 days between them.
In 1992 to 2024 the median growing season was 168 days. That is 7 days more than in 1899 to 1964.
Fitted over all years, the growing season changes by -0.2 days per decade at this station.
| Measure | Median, all years | Earliest period (1899 to 1964) | Recent period (1992 to 2024) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 27 April | 23 April | 24 April | 1 day later | +0.2 days per decade |
| First autumn frost | 6 October | 8 October | 12 October | 4 days later | 0.0 days per decade |
| Growing days | 162 days | 161 days | 168 days | 7 days more | -0.2 days per decade |
A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.
Rainfall Return Levels
104 years, 1899 to 2025A day with at least 70.0 mm (2.8 in) of rain is expected about once in 2 years. A day with at least 186.0 mm (7.3 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 70.0 mm (2.8 in) | |
| 5 years | 97.3 mm (3.8 in) | |
| 10 years | 116.7 mm (4.6 in) | |
| 25 years | 143.1 mm (5.6 in) | |
| 50 years | 164.0 mm (6.5 in) | |
| 100 years | 186.0 mm (7.3 in) |
The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 104 years of values from 1899 to 2025.
A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.
The largest wettest-day totals in the fit: 193.0 mm (7.6 in) in 1987; 175.3 mm (6.9 in) in 1977; 156.0 mm (6.1 in) in 1903.
Station Changes
1 suspectedOne change was suspected in the annual mean temperature of Red Oak, at 1951. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1951 ran 0.3 C (0.6 F) higher than in the years before (likely change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 1951 | +0.3 | +0.6 | likely | 5 |
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
Climate Twins
2008 to 2024 against 1961 to 1990Over 2008 to 2024, Red Oak had a mean temperature of 10.6 C (51.1 F) and 923.8 mm (36.4 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Pontiac (United States, 555 km away), Ottawa 4SW (United States, 531 km away) and Rantoul (United States, 602 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Pontiac | United States | 555 km (345 mi) | 10.6 C (51.1 F) | 874.9 mm (34.4 in) | 0.53 |
| Ottawa 4SW | United States | 531 km (330 mi) | 10.7 C (51.2 F) | 911.0 mm (35.9 in) | 0.53 |
| Rantoul | United States | 602 km (374 mi) | 10.7 C (51.2 F) | 920.8 mm (36.3 in) | 0.55 |
Twins are stations, not cities. A twin is one of the three stations at least 100 km away whose earlier climate is closest to this station's recent one, so a close match does not mean the two places look alike in other ways. A station move or a gap in a record can change that station's averages. The list describes past climate; it is not a forecast and does not say what caused any change. How twins are found, and a search for any station.
Download the Data
Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-14 (14 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-14).