Jerseyville 2 SW Weather Records (USC00114489)
Record envelope, standing records and threshold days for Jerseyville 2 SW (USC00114489), Illinois, United States, with 87 years of record.
Key Facts for Jerseyville 2 SW
- Jerseyville 2 SW (USC00114489) is a weather station in Illinois, United States at 39.10 latitude and -90.34 longitude, 186 m (610 ft) above sea level.
- The station reports from 1940 to 2026, 87 years of record.
- 1,464 records set at Jerseyville 2 SW still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Jerseyville 2 SW tied a monthly record high minimum temperature of 20.6 C (69.1 F) on 1 October 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: Illinois, United States, 39.10 latitude, -90.34 longitude.
- Elevation: 186 m (610 ft).
- Period of record: 1940 to 2026, 87 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
16 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 23.3 C (73.9 F) | -31.7 C (-25.1 F) | 19.4 C (66.9 F) | -24.4 C (-11.9 F) |
| Feb | 27.8 C (82.0 F) | -30.0 C (-22.0 F) | 24.4 C (75.9 F) | -20.0 C (-4.0 F) |
| Mar | 33.9 C (93.0 F) | -23.9 C (-11.0 F) | 33.9 C (93.0 F) | -11.1 C (12.0 F) |
| Apr | 33.3 C (91.9 F) | -7.8 C (18.0 F) | 31.7 C (89.1 F) | 2.8 C (37.0 F) |
| May | 35.6 C (96.1 F) | -2.2 C (28.0 F) | 30.6 C (87.1 F) | 4.4 C (39.9 F) |
| Jun | 40.0 C (104.0 F) | 2.8 C (37.0 F) | 33.9 C (93.0 F) | 11.7 C (53.1 F) |
| Jul | 44.4 C (111.9 F) | 3.3 C (37.9 F) | 36.1 C (97.0 F) | 15.6 C (60.1 F) |
| Aug | 40.6 C (105.1 F) | 3.3 C (37.9 F) | 34.4 C (93.9 F) | 12.2 C (54.0 F) |
| Sep | 38.9 C (102.0 F) | -4.4 C (24.1 F) | 38.3 C (100.9 F) | 8.9 C (48.0 F) |
| Oct | 33.9 C (93.0 F) | -8.3 C (17.1 F) | 32.8 C (91.0 F) | 6.7 C (44.1 F) |
| Nov | 28.9 C (84.0 F) | -18.9 C (-2.0 F) | n/a | n/a |
| Dec | 24.4 C (75.9 F) | -28.3 C (-18.9 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1940 | 19 |
| 1941 | 17 |
| 1942 | 20 |
| 1943 | 26 |
| 1944 | 13 |
| 1945 | 3 |
| 1948 | 15 |
| 1949 | 8 |
| 1950 | 33 |
| 1951 | 16 |
| 1952 | 37 |
| 1953 | 29 |
| 1954 | 41 |
| 1955 | 16 |
| 1956 | 21 |
| 1957 | 8 |
| 1958 | 9 |
| 1959 | 13 |
| 1960 | 17 |
| 1961 | 18 |
| 1962 | 30 |
| 1963 | 30 |
| 1964 | 19 |
| 1965 | 23 |
| 1966 | 19 |
| 1967 | 24 |
| 1968 | 13 |
| 1969 | 8 |
| 1970 | 14 |
| 1971 | 9 |
| 1972 | 14 |
| 1973 | 7 |
| 1974 | 25 |
| 1975 | 7 |
| 1976 | 30 |
| 1977 | 21 |
| 1978 | 18 |
| 1979 | 24 |
| 1980 | 24 |
| 1981 | 18 |
| 1982 | 16 |
| 1983 | 33 |
| 1984 | 18 |
| 1985 | 18 |
| 1986 | 20 |
| 1987 | 11 |
| 1988 | 17 |
| 1989 | 34 |
| 1990 | 20 |
| 1991 | 30 |
| 1992 | 15 |
| 1993 | 19 |
| 1994 | 14 |
| 1995 | 9 |
| 1996 | 22 |
| 1997 | 18 |
| 1998 | 21 |
| 1999 | 9 |
| 2000 | 14 |
| 2001 | 7 |
| 2002 | 16 |
| 2003 | 11 |
| 2004 | 13 |
| 2005 | 8 |
| 2006 | 14 |
| 2007 | 19 |
| 2008 | 9 |
| 2009 | 9 |
| 2010 | 2 |
| 2011 | 13 |
| 2012 | 21 |
| 2013 | 14 |
| 2014 | 22 |
| 2015 | 19 |
| 2016 | 14 |
| 2017 | 22 |
| 2018 | 12 |
| 2019 | 15 |
| 2020 | 7 |
| 2021 | 15 |
| 2022 | 14 |
| 2023 | 7 |
| 2024 | 11 |
| 2025 | 16 |
| 2026 | 20 |
All-Time Record Progression
3 new records| Date | Kind | Detail |
|---|---|---|
| 1977-01-17 | Record low maximum temperature | Record low maximum temperature -20.6 C (-5.1 F) |
| 1977-01-17 | Record low minimum temperature | Record low minimum temperature -31.7 C (-25.1 F) |
| 1983-12-25 | Record low maximum temperature | Record low maximum temperature -22.2 C (-8.0 F) |
Wettest Day of Each Month
Aug: 147.6 mm (5.8 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 73.7 mm (2.9 in) | 11 January 2020 |
| Feb | 56.1 mm (2.2 in) | 6 February 2008 |
| Mar | 71.6 mm (2.8 in) | 12 March 1977 |
| Apr | 102.6 mm (4.0 in) | 30 April 2017 |
| May | 115.1 mm (4.5 in) | 26 May 2008 |
| Jun | 90.7 mm (3.6 in) | 12 June 2002 |
| Jul | 138.2 mm (5.4 in) | 27 July 2025 |
| Aug | 147.6 mm (5.8 in) | 11 August 1961 |
| Sep | 96.0 mm (3.8 in) | 9 September 1989 |
| Oct | 141.7 mm (5.6 in) | 2 October 2014 |
| Nov | 89.4 mm (3.5 in) | 18 November 2003 |
| Dec | 130.0 mm (5.1 in) | 3 December 1982 |
Period of Record Coverage
1940 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1940 | 141 | 39% | No |
| 1941 | 363 | 99% | Yes |
| 1942 | 326 | 89% | No |
| 1943 | 361 | 99% | Yes |
| 1944 | 342 | 93% | Yes |
| 1945 | 73 | 20% | No |
| 1947 | 63 | 17% | No |
| 1948 | 222 | 61% | No |
| 1949 | 145 | 40% | No |
| 1950 | 356 | 98% | Yes |
| 1951 | 363 | 99% | Yes |
| 1952 | 366 | 100% | Yes |
| 1953 | 360 | 99% | Yes |
| 1954 | 362 | 99% | Yes |
| 1955 | 362 | 99% | Yes |
| 1956 | 365 | 100% | Yes |
| 1957 | 365 | 100% | Yes |
| 1958 | 365 | 100% | Yes |
| 1959 | 364 | 100% | Yes |
| 1960 | 366 | 100% | Yes |
| 1961 | 363 | 99% | Yes |
| 1962 | 365 | 100% | Yes |
| 1963 | 363 | 99% | Yes |
| 1964 | 348 | 95% | Yes |
| 1965 | 364 | 100% | Yes |
| 1966 | 364 | 100% | Yes |
| 1967 | 365 | 100% | Yes |
| 1968 | 366 | 100% | Yes |
| 1969 | 363 | 99% | Yes |
| 1970 | 365 | 100% | Yes |
| 1971 | 365 | 100% | Yes |
| 1972 | 366 | 100% | Yes |
| 1973 | 362 | 99% | Yes |
| 1974 | 363 | 99% | Yes |
| 1975 | 364 | 100% | Yes |
| 1976 | 366 | 100% | Yes |
| 1977 | 365 | 100% | Yes |
| 1978 | 364 | 100% | Yes |
| 1979 | 302 | 83% | No |
| 1980 | 365 | 100% | Yes |
| 1981 | 364 | 100% | Yes |
| 1982 | 333 | 91% | Yes |
| 1983 | 365 | 100% | Yes |
| 1984 | 366 | 100% | Yes |
| 1985 | 362 | 99% | Yes |
| 1986 | 364 | 100% | Yes |
| 1987 | 362 | 99% | Yes |
| 1988 | 365 | 100% | Yes |
| 1989 | 363 | 99% | Yes |
| 1990 | 361 | 99% | Yes |
| 1991 | 354 | 97% | Yes |
| 1992 | 365 | 100% | Yes |
| 1993 | 363 | 99% | Yes |
| 1994 | 364 | 100% | Yes |
| 1995 | 362 | 99% | Yes |
| 1996 | 365 | 100% | Yes |
| 1997 | 364 | 100% | Yes |
| 1998 | 364 | 100% | Yes |
| 1999 | 362 | 99% | Yes |
| 2000 | 364 | 99% | Yes |
| 2001 | 296 | 81% | No |
| 2002 | 365 | 100% | Yes |
| 2003 | 332 | 91% | Yes |
| 2004 | 306 | 84% | No |
| 2005 | 356 | 98% | Yes |
| 2006 | 273 | 75% | No |
| 2007 | 360 | 99% | Yes |
| 2008 | 363 | 99% | Yes |
| 2009 | 303 | 83% | No |
| 2010 | 365 | 100% | Yes |
| 2011 | 365 | 100% | Yes |
| 2012 | 341 | 93% | Yes |
| 2013 | 355 | 97% | Yes |
| 2014 | 360 | 99% | Yes |
| 2015 | 361 | 99% | Yes |
| 2016 | 365 | 100% | Yes |
| 2017 | 364 | 100% | Yes |
| 2018 | 360 | 99% | Yes |
| 2019 | 364 | 100% | Yes |
| 2020 | 362 | 99% | Yes |
| 2021 | 360 | 99% | Yes |
| 2022 | 359 | 98% | Yes |
| 2023 | 353 | 97% | Yes |
| 2024 | 361 | 99% | Yes |
| 2025 | 346 | 95% | Yes |
| 2026 | 274 | 75% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 1 October 2026 | Jerseyville 2 SW, US | monthly high min (Tie, Provisional) | 20.6 C (69.1 F) | tie | 71 years | 9 of 100 (Routine) |
| 1 October 2026 | Jerseyville 2 SW, US | daily high max (Tie, Provisional) | 32.8 C (91.0 F) | tie | 7 years | 2 of 100 (Routine) |
| 20 September 2026 | Jerseyville 2 SW, US | daily high max (Provisional) | 36.1 C (97.0 F) | 0.5 C (0.9 F) | 85 years | 34 of 100 (Routine) |
| 20 September 2026 | Jerseyville 2 SW, US | daily high min (Provisional) | 21.1 C (70.0 F) | 0.5 C (0.9 F) | 60 years | 26 of 100 (Routine) |
| 19 September 2026 | Jerseyville 2 SW, US | daily high max (Provisional) | 37.2 C (99.0 F) | 2.8 C (5.0 F) | 85 years | 39 of 100 (Notable) |
| 19 September 2026 | Jerseyville 2 SW, US | daily high min (Provisional) | 22.8 C (73.0 F) | 1.1 C (2.0 F) | 48 years | 24 of 100 (Routine) |
| 18 September 2026 | Jerseyville 2 SW, US | daily high max (Provisional) | 38.3 C (100.9 F) | 3.3 C (5.9 F) | 72 years | 36 of 100 (Notable) |
| 17 September 2026 | Jerseyville 2 SW, US | daily high max (Provisional) | 35.6 C (96.1 F) | 0.6 C (1.1 F) | 72 years | 30 of 100 (Routine) |
| 17 September 2026 | Jerseyville 2 SW, US | daily high min (Provisional) | 22.8 C (73.0 F) | 2.8 C (5.0 F) | 28 years | 21 of 100 (Routine) |
| 16 September 2026 | Jerseyville 2 SW, US | daily high max (Provisional) | 37.2 C (99.0 F) | 1.6 C (2.9 F) | 72 years | 32 of 100 (Routine) |
| 16 September 2026 | Jerseyville 2 SW, US | daily high min (Provisional) | 22.8 C (73.0 F) | 2.2 C (4.0 F) | 35 years | 22 of 100 (Routine) |
| 6 September 2026 | Jerseyville 2 SW, US | daily high max (Tie, Provisional) | 38.3 C (100.9 F) | tie | 72 years | 7 of 100 (Routine) |
| 5 September 2026 | Jerseyville 2 SW, US | daily high min (Provisional) | 23.3 C (73.9 F) | 2.2 C (4.0 F) | 72 years | 33 of 100 (Routine) |
| 4 September 2026 | Jerseyville 2 SW, US | daily high min (Provisional) | 23.9 C (75.0 F) | 1.7 C (3.1 F) | 84 years | 36 of 100 (Notable) |
| 3 September 2026 | Jerseyville 2 SW, US | daily high max (Provisional) | 38.3 C (100.9 F) | 1.1 C (2.0 F) | 15 years | 14 of 100 (Routine) |
| 3 September 2026 | Jerseyville 2 SW, US | monthly high min (Tie, Provisional) | 24.4 C (75.9 F) | tie | 83 years | 10 of 100 (Routine) |
| 2 September 2026 | Jerseyville 2 SW, US | daily high min (Provisional) | 22.8 C (73.0 F) | 0.6 C (1.1 F) | 64 years | 28 of 100 (Routine) |
| 16 August 2026 | Jerseyville 2 SW, US | daily high min (Tie, Provisional) | 23.9 C (75.0 F) | tie | 72 years | 7 of 100 (Routine) |
| 15 August 2026 | Jerseyville 2 SW, US | daily high min | 25.0 C (77.0 F) | 0.6 C (1.1 F) | 39 years | 20 of 100 (Routine) |
| 12 August 2026 | Jerseyville 2 SW, US | daily high min (Tie) | 24.4 C (75.9 F) | tie | 83 years | 8 of 100 (Routine) |
Climate Trend
67 complete years, 1941 to 2024| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1941 | 13.5 C | +1.33 C |
| 1943 | 13.0 C | +0.86 C |
| 1950 | 12.5 C | +0.31 C |
| 1951 | 12.2 C | +0.04 C |
| 1952 | 13.3 C | +1.18 C |
| 1953 | 13.9 C | +1.73 C |
| 1954 | 13.9 C | +1.73 C |
| 1955 | 13.1 C | +0.98 C |
| 1956 | 13.2 C | +1.05 C |
| 1957 | 12.8 C | +0.67 C |
| 1958 | 12.3 C | +0.12 C |
| 1959 | 12.9 C | +0.76 C |
| 1960 | 11.6 C | -0.51 C |
| 1961 | 11.7 C | -0.44 C |
| 1962 | 11.7 C | -0.43 C |
| 1963 | 12.5 C | +0.38 C |
| 1965 | 12.8 C | +0.60 C |
| 1966 | 11.5 C | -0.65 C |
| 1967 | 11.7 C | -0.48 C |
| 1968 | 11.6 C | -0.54 C |
| 1969 | 11.4 C | -0.76 C |
| 1970 | 12.0 C | -0.14 C |
| 1971 | 12.7 C | +0.55 C |
| 1972 | 12.0 C | -0.11 C |
| 1973 | 13.0 C | +0.83 C |
| 1974 | 12.3 C | +0.17 C |
| 1975 | 12.2 C | +0.07 C |
| 1976 | 11.0 C | -1.15 C |
| 1977 | 11.6 C | -0.59 C |
| 1978 | 10.3 C | -1.87 C |
| 1980 | 11.2 C | -0.93 C |
| 1981 | 11.2 C | -0.92 C |
| 1984 | 11.6 C | -0.54 C |
| 1985 | 11.1 C | -1.10 C |
| 1986 | 12.7 C | +0.53 C |
| 1987 | 13.0 C | +0.86 C |
| 1988 | 11.7 C | -0.42 C |
| 1989 | 11.2 C | -0.95 C |
| 1990 | 13.0 C | +0.85 C |
| 1991 | 12.9 C | +0.75 C |
| 1992 | 11.9 C | -0.25 C |
| 1993 | 10.9 C | -1.27 C |
| 1994 | 11.7 C | -0.42 C |
| 1995 | 11.3 C | -0.90 C |
| 1996 | 10.7 C | -1.50 C |
| 1997 | 11.1 C | -1.05 C |
| 1998 | 13.3 C | +1.15 C |
| 1999 | 12.5 C | +0.35 C |
| 2000 | 11.8 C | -0.38 C |
| 2002 | 12.3 C | +0.13 C |
| 2005 | 12.8 C | +0.62 C |
| 2007 | 12.7 C | +0.59 C |
| 2008 | 11.1 C | -1.07 C |
| 2010 | 11.9 C | -0.21 C |
| 2011 | 12.3 C | +0.19 C |
| 2013 | 11.0 C | -1.13 C |
| 2014 | 10.2 C | -1.98 C |
| 2015 | 12.0 C | -0.12 C |
| 2016 | 13.1 C | +0.99 C |
| 2017 | 13.0 C | +0.82 C |
| 2018 | 12.0 C | -0.13 C |
| 2019 | 11.7 C | -0.44 C |
| 2020 | 12.2 C | +0.07 C |
| 2021 | 12.5 C | +0.34 C |
| 2022 | 11.6 C | -0.54 C |
| 2023 | 13.0 C | +0.81 C |
| 2024 | 13.3 C | +1.19 C |
The fitted trend in annual mean temperature here over 1941 to 2024 is -0.08 C (-0.17 to 0.01) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.15 F (-0.31 to 0.01) per decade. The slope is a straight line fitted to 67 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | -0.08 C (-0.17 to 0.01) per decade | -0.15 F (-0.31 to 0.01) per decade | 1941 to 2024 | 67 | Not clearly different from zero |
| Mean daily maximum | -0.2 C (-0.3 to -0.1) per decade | -0.3 F (-0.5 to -0.1) per decade | 1941 to 2024 | 67 | Fall |
| Mean daily minimum | 0.02 C (-0.07 to 0.11) per decade | 0.03 F (-0.12 to 0.19) per decade | 1941 to 2024 | 67 | 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
1940 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 44.4 C (111.9 F) | 1954 | 36.7 C (98.1 F) | 86 |
| Coldest night (TNn) | -31.7 C (-25.1 F) | 1977 | -22.2 C (-8.0 F) | 86 |
| Wettest day (Rx1day) | 147.6 mm (5.8 in) | 1961 | 63.5 mm (2.5 in) | 86 |
| Wettest five days (Rx5day) | 201.2 mm (7.9 in) | 1961 | 99.4 mm (3.9 in) | 86 |
| Longest dry spell (CDD) | 39 days | 2025 | 22 days | 86 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1940 | 36.7 C (98.1 F) |
| 1941 | 38.3 C (100.9 F) |
| 1942 | 35.6 C (96.1 F) |
| 1943 | 39.4 C (102.9 F) |
| 1944 | 38.3 C (100.9 F) |
| 1945 | 29.4 C (84.9 F) |
| 1947 | 17.2 C (63.0 F) |
| 1948 | 35.6 C (96.1 F) |
| 1949 | 32.2 C (90.0 F) |
| 1950 | 35.6 C (96.1 F) |
| 1951 | 36.7 C (98.1 F) |
| 1952 | 39.4 C (102.9 F) |
| 1953 | 39.4 C (102.9 F) |
| 1954 | 44.4 C (111.9 F) |
| 1955 | 37.2 C (99.0 F) |
| 1956 | 36.7 C (98.1 F) |
| 1957 | 36.7 C (98.1 F) |
| 1958 | 35.6 C (96.1 F) |
| 1959 | 37.2 C (99.0 F) |
| 1960 | 37.8 C (100.0 F) |
| 1961 | 34.4 C (93.9 F) |
| 1962 | 40.0 C (104.0 F) |
| 1963 | 39.4 C (102.9 F) |
| 1964 | 40.6 C (105.1 F) |
| 1965 | 35.6 C (96.1 F) |
| 1966 | 38.9 C (102.0 F) |
| 1967 | 33.3 C (91.9 F) |
| 1968 | 33.9 C (93.0 F) |
| 1969 | 34.4 C (93.9 F) |
| 1970 | 38.3 C (100.9 F) |
| 1971 | 35.6 C (96.1 F) |
| 1972 | 36.1 C (97.0 F) |
| 1973 | 35.0 C (95.0 F) |
| 1974 | 37.2 C (99.0 F) |
| 1975 | 36.7 C (98.1 F) |
| 1976 | 36.7 C (98.1 F) |
| 1977 | 36.7 C (98.1 F) |
| 1978 | 36.1 C (97.0 F) |
| 1979 | 36.7 C (98.1 F) |
| 1980 | 40.0 C (104.0 F) |
| 1981 | 35.0 C (95.0 F) |
| 1982 | 35.0 C (95.0 F) |
| 1983 | 39.4 C (102.9 F) |
| 1984 | 40.0 C (104.0 F) |
| 1985 | 35.0 C (95.0 F) |
| 1986 | 36.1 C (97.0 F) |
| 1987 | 38.9 C (102.0 F) |
| 1988 | 37.8 C (100.0 F) |
| 1989 | 36.1 C (97.0 F) |
| 1990 | 37.2 C (99.0 F) |
| 1991 | 36.7 C (98.1 F) |
| 1992 | 35.6 C (96.1 F) |
| 1993 | 34.4 C (93.9 F) |
| 1994 | 36.1 C (97.0 F) |
| 1995 | 36.7 C (98.1 F) |
| 1996 | 34.4 C (93.9 F) |
| 1997 | 36.7 C (98.1 F) |
| 1998 | 36.7 C (98.1 F) |
| 1999 | 37.8 C (100.0 F) |
| 2000 | 35.6 C (96.1 F) |
| 2001 | 37.2 C (99.0 F) |
| 2002 | 36.1 C (97.0 F) |
| 2003 | 37.2 C (99.0 F) |
| 2004 | 33.9 C (93.0 F) |
| 2005 | 37.8 C (100.0 F) |
| 2006 | 37.2 C (99.0 F) |
| 2007 | 39.4 C (102.9 F) |
| 2008 | 35.0 C (95.0 F) |
| 2009 | 33.9 C (93.0 F) |
| 2010 | 36.1 C (97.0 F) |
| 2011 | 37.8 C (100.0 F) |
| 2012 | 40.0 C (104.0 F) |
| 2013 | 38.9 C (102.0 F) |
| 2014 | 35.0 C (95.0 F) |
| 2015 | 34.4 C (93.9 F) |
| 2016 | 36.7 C (98.1 F) |
| 2017 | 38.9 C (102.0 F) |
| 2018 | 36.1 C (97.0 F) |
| 2019 | 34.4 C (93.9 F) |
| 2020 | 34.4 C (93.9 F) |
| 2021 | 35.0 C (95.0 F) |
| 2022 | 37.2 C (99.0 F) |
| 2023 | 36.7 C (98.1 F) |
| 2024 | 37.8 C (100.0 F) |
| 2025 | 36.7 C (98.1 F) |
| 2026 | 38.3 C (100.9 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1940 | -13.9 C (7.0 F) |
| 1941 | -15.6 C (3.9 F) |
| 1942 | -22.8 C (-9.0 F) |
| 1943 | -24.4 C (-11.9 F) |
| 1944 | -19.4 C (-2.9 F) |
| 1945 | -22.2 C (-8.0 F) |
| 1947 | -10.0 C (14.0 F) |
| 1948 | -23.3 C (-9.9 F) |
| 1949 | -11.1 C (12.0 F) |
| 1950 | -18.3 C (-0.9 F) |
| 1951 | -24.4 C (-11.9 F) |
| 1952 | -17.2 C (1.0 F) |
| 1953 | -17.2 C (1.0 F) |
| 1954 | -17.8 C (0.0 F) |
| 1955 | -20.6 C (-5.1 F) |
| 1956 | -16.1 C (3.0 F) |
| 1957 | -20.0 C (-4.0 F) |
| 1958 | -21.7 C (-7.1 F) |
| 1959 | -22.8 C (-9.0 F) |
| 1960 | -23.9 C (-11.0 F) |
| 1961 | -22.8 C (-9.0 F) |
| 1962 | -26.1 C (-15.0 F) |
| 1963 | -25.0 C (-13.0 F) |
| 1964 | -19.4 C (-2.9 F) |
| 1965 | -25.6 C (-14.1 F) |
| 1966 | -23.9 C (-11.0 F) |
| 1967 | -18.9 C (-2.0 F) |
| 1968 | -26.1 C (-15.0 F) |
| 1969 | -18.9 C (-2.0 F) |
| 1970 | -24.4 C (-11.9 F) |
| 1971 | -20.0 C (-4.0 F) |
| 1972 | -23.3 C (-9.9 F) |
| 1973 | -26.1 C (-15.0 F) |
| 1974 | -29.4 C (-20.9 F) |
| 1975 | -20.0 C (-4.0 F) |
| 1976 | -23.9 C (-11.0 F) |
| 1977 | -31.7 C (-25.1 F) |
| 1978 | -23.3 C (-9.9 F) |
| 1979 | -30.0 C (-22.0 F) |
| 1980 | -24.4 C (-11.9 F) |
| 1981 | -27.2 C (-17.0 F) |
| 1982 | -30.0 C (-22.0 F) |
| 1983 | -28.3 C (-18.9 F) |
| 1984 | -26.7 C (-16.1 F) |
| 1985 | -28.9 C (-20.0 F) |
| 1986 | -20.6 C (-5.1 F) |
| 1987 | -25.6 C (-14.1 F) |
| 1988 | -23.9 C (-11.0 F) |
| 1989 | -28.3 C (-18.9 F) |
| 1990 | -22.2 C (-8.0 F) |
| 1991 | -18.9 C (-2.0 F) |
| 1992 | -17.2 C (1.0 F) |
| 1993 | -22.2 C (-8.0 F) |
| 1994 | -27.2 C (-17.0 F) |
| 1995 | -18.3 C (-0.9 F) |
| 1996 | -26.7 C (-16.1 F) |
| 1997 | -21.7 C (-7.1 F) |
| 1998 | -16.1 C (3.0 F) |
| 1999 | -24.4 C (-11.9 F) |
| 2000 | -20.0 C (-4.0 F) |
| 2001 | -21.7 C (-7.1 F) |
| 2002 | -17.8 C (0.0 F) |
| 2003 | -18.9 C (-2.0 F) |
| 2004 | -22.8 C (-9.0 F) |
| 2005 | -22.2 C (-8.0 F) |
| 2006 | -16.7 C (1.9 F) |
| 2007 | -19.4 C (-2.9 F) |
| 2008 | -17.8 C (0.0 F) |
| 2009 | -20.0 C (-4.0 F) |
| 2010 | -24.4 C (-11.9 F) |
| 2011 | -21.7 C (-7.1 F) |
| 2012 | -15.6 C (3.9 F) |
| 2013 | -16.1 C (3.0 F) |
| 2014 | -26.1 C (-15.0 F) |
| 2015 | -19.4 C (-2.9 F) |
| 2016 | -18.3 C (-0.9 F) |
| 2017 | -21.1 C (-6.0 F) |
| 2018 | -22.8 C (-9.0 F) |
| 2019 | -22.8 C (-9.0 F) |
| 2020 | -17.8 C (0.0 F) |
| 2021 | -22.2 C (-8.0 F) |
| 2022 | -21.7 C (-7.1 F) |
| 2023 | -13.3 C (8.1 F) |
| 2024 | -22.8 C (-9.0 F) |
| 2025 | -20.0 C (-4.0 F) |
| 2026 | -24.4 C (-11.9 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1940 | 35.6 mm (1.4 in) |
| 1941 | 64.8 mm (2.6 in) |
| 1942 | 68.3 mm (2.7 in) |
| 1943 | 50.8 mm (2.0 in) |
| 1944 | 78.0 mm (3.1 in) |
| 1945 | 35.3 mm (1.4 in) |
| 1947 | 23.9 mm (0.9 in) |
| 1948 | 47.0 mm (1.9 in) |
| 1949 | 45.7 mm (1.8 in) |
| 1950 | 50.8 mm (2.0 in) |
| 1951 | 54.9 mm (2.2 in) |
| 1952 | 32.8 mm (1.3 in) |
| 1953 | 68.6 mm (2.7 in) |
| 1954 | 56.4 mm (2.2 in) |
| 1955 | 67.8 mm (2.7 in) |
| 1956 | 63.2 mm (2.5 in) |
| 1957 | 89.2 mm (3.5 in) |
| 1958 | 42.7 mm (1.7 in) |
| 1959 | 28.7 mm (1.1 in) |
| 1960 | 51.1 mm (2.0 in) |
| 1961 | 147.6 mm (5.8 in) |
| 1962 | 66.5 mm (2.6 in) |
| 1963 | 53.3 mm (2.1 in) |
| 1964 | 68.3 mm (2.7 in) |
| 1965 | 65.0 mm (2.6 in) |
| 1966 | 48.3 mm (1.9 in) |
| 1967 | 47.2 mm (1.9 in) |
| 1968 | 56.4 mm (2.2 in) |
| 1969 | 95.0 mm (3.7 in) |
| 1970 | 53.3 mm (2.1 in) |
| 1971 | 57.2 mm (2.3 in) |
| 1972 | 50.8 mm (2.0 in) |
| 1973 | 65.3 mm (2.6 in) |
| 1974 | 61.5 mm (2.4 in) |
| 1975 | 81.8 mm (3.2 in) |
| 1976 | 86.9 mm (3.4 in) |
| 1977 | 71.6 mm (2.8 in) |
| 1978 | 68.6 mm (2.7 in) |
| 1979 | 61.5 mm (2.4 in) |
| 1980 | 35.6 mm (1.4 in) |
| 1981 | 55.9 mm (2.2 in) |
| 1982 | 130.0 mm (5.1 in) |
| 1983 | 94.7 mm (3.7 in) |
| 1984 | 61.0 mm (2.4 in) |
| 1985 | 66.3 mm (2.6 in) |
| 1986 | 58.7 mm (2.3 in) |
| 1987 | 55.9 mm (2.2 in) |
| 1988 | 40.9 mm (1.6 in) |
| 1989 | 96.0 mm (3.8 in) |
| 1990 | 72.6 mm (2.9 in) |
| 1991 | 47.8 mm (1.9 in) |
| 1992 | 53.3 mm (2.1 in) |
| 1993 | 88.9 mm (3.5 in) |
| 1994 | 67.3 mm (2.6 in) |
| 1995 | 64.8 mm (2.6 in) |
| 1996 | 76.5 mm (3.0 in) |
| 1997 | 44.5 mm (1.8 in) |
| 1998 | 34.5 mm (1.4 in) |
| 1999 | 63.5 mm (2.5 in) |
| 2000 | 71.1 mm (2.8 in) |
| 2001 | 91.9 mm (3.6 in) |
| 2002 | 90.7 mm (3.6 in) |
| 2003 | 89.4 mm (3.5 in) |
| 2004 | 50.8 mm (2.0 in) |
| 2005 | 55.6 mm (2.2 in) |
| 2006 | 65.3 mm (2.6 in) |
| 2007 | 50.8 mm (2.0 in) |
| 2008 | 115.1 mm (4.5 in) |
| 2009 | 70.1 mm (2.8 in) |
| 2010 | 61.5 mm (2.4 in) |
| 2011 | 58.7 mm (2.3 in) |
| 2012 | 69.9 mm (2.8 in) |
| 2013 | 63.5 mm (2.5 in) |
| 2014 | 141.7 mm (5.6 in) |
| 2015 | 112.3 mm (4.4 in) |
| 2016 | 66.5 mm (2.6 in) |
| 2017 | 102.6 mm (4.0 in) |
| 2018 | 50.3 mm (2.0 in) |
| 2019 | 81.8 mm (3.2 in) |
| 2020 | 73.7 mm (2.9 in) |
| 2021 | 53.6 mm (2.1 in) |
| 2022 | 62.2 mm (2.4 in) |
| 2023 | 42.7 mm (1.7 in) |
| 2024 | 101.6 mm (4.0 in) |
| 2025 | 138.2 mm (5.4 in) |
| 2026 | 89.4 mm (3.5 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1940 | 40.0 mm (1.6 in) |
| 1941 | 106.5 mm (4.2 in) |
| 1942 | 119.2 mm (4.7 in) |
| 1943 | 134.8 mm (5.3 in) |
| 1944 | 98.1 mm (3.9 in) |
| 1945 | 32.5 mm (1.3 in) |
| 1947 | 31.5 mm (1.2 in) |
| 1948 | 91.4 mm (3.6 in) |
| 1949 | 68.5 mm (2.7 in) |
| 1950 | 91.4 mm (3.6 in) |
| 1951 | 124.2 mm (4.9 in) |
| 1952 | 47.3 mm (1.9 in) |
| 1953 | 80.3 mm (3.2 in) |
| 1954 | 68.8 mm (2.7 in) |
| 1955 | 79.0 mm (3.1 in) |
| 1956 | 104.9 mm (4.1 in) |
| 1957 | 112.6 mm (4.4 in) |
| 1958 | 63.0 mm (2.5 in) |
| 1959 | 52.7 mm (2.1 in) |
| 1960 | 124.6 mm (4.9 in) |
| 1961 | 201.2 mm (7.9 in) |
| 1962 | 154.2 mm (6.1 in) |
| 1963 | 73.4 mm (2.9 in) |
| 1964 | 77.0 mm (3.0 in) |
| 1965 | 77.9 mm (3.1 in) |
| 1966 | 103.4 mm (4.1 in) |
| 1967 | 59.9 mm (2.4 in) |
| 1968 | 115.5 mm (4.5 in) |
| 1969 | 151.1 mm (5.9 in) |
| 1970 | 113.4 mm (4.5 in) |
| 1971 | 93.3 mm (3.7 in) |
| 1972 | 88.4 mm (3.5 in) |
| 1973 | 96.4 mm (3.8 in) |
| 1974 | 89.2 mm (3.5 in) |
| 1975 | 108.2 mm (4.3 in) |
| 1976 | 92.2 mm (3.6 in) |
| 1977 | 83.1 mm (3.3 in) |
| 1978 | 91.0 mm (3.6 in) |
| 1979 | 109.8 mm (4.3 in) |
| 1980 | 60.5 mm (2.4 in) |
| 1981 | 126.5 mm (5.0 in) |
| 1982 | 175.5 mm (6.9 in) |
| 1983 | 142.5 mm (5.6 in) |
| 1984 | 102.4 mm (4.0 in) |
| 1985 | 101.1 mm (4.0 in) |
| 1986 | 145.9 mm (5.7 in) |
| 1987 | 81.0 mm (3.2 in) |
| 1988 | 76.0 mm (3.0 in) |
| 1989 | 100.6 mm (4.0 in) |
| 1990 | 148.6 mm (5.9 in) |
| 1991 | 80.0 mm (3.1 in) |
| 1992 | 73.2 mm (2.9 in) |
| 1993 | 120.2 mm (4.7 in) |
| 1994 | 157.4 mm (6.2 in) |
| 1995 | 118.0 mm (4.6 in) |
| 1996 | 107.5 mm (4.2 in) |
| 1997 | 63.1 mm (2.5 in) |
| 1998 | 72.3 mm (2.8 in) |
| 1999 | 69.4 mm (2.7 in) |
| 2000 | 154.6 mm (6.1 in) |
| 2001 | 109.7 mm (4.3 in) |
| 2002 | 130.8 mm (5.1 in) |
| 2003 | 97.8 mm (3.9 in) |
| 2004 | 96.3 mm (3.8 in) |
| 2005 | 130.5 mm (5.1 in) |
| 2006 | 91.7 mm (3.6 in) |
| 2007 | 53.7 mm (2.1 in) |
| 2008 | 171.5 mm (6.8 in) |
| 2009 | 139.3 mm (5.5 in) |
| 2010 | 91.2 mm (3.6 in) |
| 2011 | 95.5 mm (3.8 in) |
| 2012 | 105.7 mm (4.2 in) |
| 2013 | 118.9 mm (4.7 in) |
| 2014 | 170.6 mm (6.7 in) |
| 2015 | 175.0 mm (6.9 in) |
| 2016 | 108.7 mm (4.3 in) |
| 2017 | 175.6 mm (6.9 in) |
| 2018 | 84.0 mm (3.3 in) |
| 2019 | 145.3 mm (5.7 in) |
| 2020 | 112.1 mm (4.4 in) |
| 2021 | 92.7 mm (3.6 in) |
| 2022 | 87.1 mm (3.4 in) |
| 2023 | 57.2 mm (2.3 in) |
| 2024 | 135.6 mm (5.3 in) |
| 2025 | 156.0 mm (6.1 in) |
| 2026 | 71.4 mm (2.8 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1940 | 33 days |
| 1941 | 28 days |
| 1942 | 29 days |
| 1943 | 20 days |
| 1944 | 23 days |
| 1945 | 32 days |
| 1947 | 20 days |
| 1948 | 24 days |
| 1949 | 21 days |
| 1950 | 29 days |
| 1951 | 14 days |
| 1952 | 27 days |
| 1953 | 23 days |
| 1954 | 20 days |
| 1955 | 38 days |
| 1956 | 33 days |
| 1957 | 21 days |
| 1958 | 33 days |
| 1959 | 24 days |
| 1960 | 23 days |
| 1961 | 14 days |
| 1962 | 23 days |
| 1963 | 35 days |
| 1964 | 29 days |
| 1965 | 14 days |
| 1966 | 32 days |
| 1967 | 26 days |
| 1968 | 34 days |
| 1969 | 17 days |
| 1970 | 25 days |
| 1971 | 25 days |
| 1972 | 18 days |
| 1973 | 15 days |
| 1974 | 27 days |
| 1975 | 11 days |
| 1976 | 25 days |
| 1977 | 32 days |
| 1978 | 20 days |
| 1979 | 31 days |
| 1980 | 25 days |
| 1981 | 23 days |
| 1982 | 17 days |
| 1983 | 31 days |
| 1984 | 34 days |
| 1985 | 28 days |
| 1986 | 32 days |
| 1987 | 27 days |
| 1988 | 27 days |
| 1989 | 21 days |
| 1990 | 20 days |
| 1991 | 15 days |
| 1992 | 20 days |
| 1993 | 17 days |
| 1994 | 15 days |
| 1995 | 25 days |
| 1996 | 20 days |
| 1997 | 20 days |
| 1998 | 16 days |
| 1999 | 21 days |
| 2000 | 18 days |
| 2001 | 16 days |
| 2002 | 22 days |
| 2003 | 18 days |
| 2004 | 20 days |
| 2005 | 21 days |
| 2006 | 19 days |
| 2007 | 22 days |
| 2008 | 20 days |
| 2009 | 26 days |
| 2010 | 22 days |
| 2011 | 18 days |
| 2012 | 21 days |
| 2013 | 26 days |
| 2014 | 20 days |
| 2015 | 20 days |
| 2016 | 17 days |
| 2017 | 19 days |
| 2018 | 22 days |
| 2019 | 13 days |
| 2020 | 21 days |
| 2021 | 21 days |
| 2022 | 17 days |
| 2023 | 21 days |
| 2024 | 25 days |
| 2025 | 39 days |
| 2026 | 19 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
67 years with a frostAcross 67 years with a frost, the median last spring frost at Jerseyville 2 SW falls on 18 April and the median first autumn frost on 15 October, which leaves a median of 179 days between them.
In 1989 to 2024 the median growing season was 181 days. That is 3 days more than in 1941 to 1978.
Fitted over all years, the growing season changes by +1.2 days per decade at this station.
| Measure | Median, all years | Earliest period (1941 to 1978) | Recent period (1989 to 2024) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 18 April | 20 April | 16 April | 4 days earlier | -0.7 days per decade |
| First autumn frost | 15 October | 15 October | 18 October | 3 days later | +0.5 days per decade |
| Growing days | 179 days | 178 days | 181 days | 3 days more | +1.2 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
74 years, 1941 to 2024A day with at least 63.1 mm (2.5 in) of rain is expected about once in 2 years. A day with at least 150.0 mm (5.9 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 63.1 mm (2.5 in) | |
| 5 years | 83.3 mm (3.3 in) | |
| 10 years | 97.8 mm (3.9 in) | |
| 25 years | 117.5 mm (4.6 in) | |
| 50 years | 133.3 mm (5.2 in) | |
| 100 years | 150.0 mm (5.9 in) | Longer than the 74 years of record |
The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 74 years of values from 1941 to 2024.
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: 147.6 mm (5.8 in) in 1961; 141.7 mm (5.6 in) in 2014; 130.0 mm (5.1 in) in 1982.
Station Changes
1 suspectedOne change was suspected in the annual mean temperature of Jerseyville 2 SW, at 2007. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 2007 ran 0.3 C (0.5 F) lower than in the years before (possible change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 2007 | -0.3 | -0.5 | possible | 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, Jerseyville 2 SW had a mean temperature of 12.1 C (53.7 F) and 1,112.1 mm (43.8 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Vincennes 4 E (United States, 254 km away), Scottsburg (United States, 397 km away) and Palestine (United States, 236 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Vincennes 4 E | United States | 254 km (158 mi) | 12.1 C (53.8 F) | 1,059.1 mm (41.7 in) | 0.58 |
| Scottsburg | United States | 397 km (247 mi) | 12.0 C (53.6 F) | 1,106.7 mm (43.6 in) | 0.59 |
| Palestine | United States | 236 km (147 mi) | 12.3 C (54.2 F) | 1,064.3 mm (41.9 in) | 0.60 |
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).