Quincy Dam 21 Weather Records (USC00117077)
Record envelope, standing records and threshold days for Quincy Dam 21 (USC00117077), Illinois, United States, with 90 years of record.
Key Facts for Quincy Dam 21
- Quincy Dam 21 (USC00117077) is a weather station in Illinois, United States at 39.90 latitude and -91.43 longitude, 147 m (483 ft) above sea level.
- The station reports from 1937 to 2026, 90 years of record.
- 1,464 records set at Quincy Dam 21 still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Quincy Dam 21 set a daily record high minimum temperature of 17.2 C (63.0 F) on 15 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, 39.90 latitude, -91.43 longitude.
- Elevation: 147 m (483 ft).
- Period of record: 1937 to 2026, 90 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
27 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 26.1 C (79.0 F) | -29.4 C (-20.9 F) | 18.9 C (66.0 F) | -20.0 C (-4.0 F) |
| Feb | 26.1 C (79.0 F) | -27.2 C (-17.0 F) | 22.8 C (73.0 F) | -16.1 C (3.0 F) |
| Mar | 32.8 C (91.0 F) | -24.4 C (-11.9 F) | 32.8 C (91.0 F) | -11.1 C (12.0 F) |
| Apr | 33.3 C (91.9 F) | -11.1 C (12.0 F) | 30.6 C (87.1 F) | 2.2 C (36.0 F) |
| May | 36.7 C (98.1 F) | 0.6 C (33.1 F) | 31.1 C (88.0 F) | 5.0 C (41.0 F) |
| Jun | 39.4 C (102.9 F) | 7.2 C (45.0 F) | 34.4 C (93.9 F) | 13.9 C (57.0 F) |
| Jul | 40.6 C (105.1 F) | 11.1 C (52.0 F) | 36.7 C (98.1 F) | 16.7 C (62.1 F) |
| Aug | 40.6 C (105.1 F) | 8.9 C (48.0 F) | 36.7 C (98.1 F) | 17.2 C (63.0 F) |
| Sep | 39.4 C (102.9 F) | -1.1 C (30.0 F) | 38.9 C (102.0 F) | 11.7 C (53.1 F) |
| Oct | 36.1 C (97.0 F) | -5.6 C (21.9 F) | 33.3 C (91.9 F) | 9.4 C (48.9 F) |
| Nov | 30.6 C (87.1 F) | -16.1 C (3.0 F) | n/a | n/a |
| Dec | 24.4 C (75.9 F) | -27.8 C (-18.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1937 | 23 |
| 1938 | 32 |
| 1939 | 38 |
| 1940 | 36 |
| 1941 | 52 |
| 1942 | 35 |
| 1943 | 25 |
| 1944 | 21 |
| 1945 | 32 |
| 1946 | 27 |
| 1947 | 20 |
| 1948 | 8 |
| 1967 | 2 |
| 1970 | 1 |
| 1974 | 4 |
| 1977 | 38 |
| 1978 | 32 |
| 1979 | 44 |
| 1980 | 29 |
| 1981 | 24 |
| 1982 | 26 |
| 1983 | 36 |
| 1984 | 19 |
| 1985 | 14 |
| 1986 | 11 |
| 1987 | 2 |
| 1988 | 32 |
| 1989 | 35 |
| 1990 | 30 |
| 1991 | 36 |
| 1992 | 24 |
| 1993 | 13 |
| 1995 | 4 |
| 1996 | 32 |
| 1997 | 29 |
| 1998 | 18 |
| 1999 | 18 |
| 2000 | 28 |
| 2001 | 23 |
| 2002 | 28 |
| 2003 | 13 |
| 2004 | 14 |
| 2005 | 22 |
| 2006 | 31 |
| 2007 | 19 |
| 2008 | 16 |
| 2009 | 19 |
| 2010 | 18 |
| 2011 | 10 |
| 2012 | 39 |
| 2013 | 21 |
| 2014 | 31 |
| 2015 | 9 |
| 2016 | 20 |
| 2017 | 31 |
| 2018 | 34 |
| 2019 | 15 |
| 2020 | 13 |
| 2021 | 19 |
| 2022 | 17 |
| 2023 | 16 |
| 2024 | 20 |
| 2025 | 14 |
| 2026 | 22 |
All-Time Record Progression
8 new records| Date | Kind | Detail |
|---|---|---|
| 1978-02-14 | Record snow depth | Record snow depth 35.6 cm (14.0 in) |
| 1979-01-13 | Record snow depth | Record snow depth 40.6 cm (16.0 in) |
| 1979-01-14 | Record snow depth | Record snow depth 48.3 cm (19.0 in) |
| 1979-02-09 | Record snow depth | Record snow depth 50.8 cm (20.0 in) |
| 1993-07-01 | Record daily precipitation | Record daily precipitation 153.9 mm (6.1 in) |
| 2003-08-27 | Record high maximum temperature | Record high maximum temperature 40.6 C (105.1 F) |
| 2011-02-02 | Record daily snowfall | Record daily snowfall 55.9 cm (22.0 in) |
| 2011-02-02 | Record snow depth | Record snow depth 55.9 cm (22.0 in) |
Wettest Day of Each Month
Jul: 153.9 mm (6.1 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 66.8 mm (2.6 in) | 30 January 1982 |
| Feb | 83.1 mm (3.3 in) | 21 February 1997 |
| Mar | 50.3 mm (2.0 in) | 4 March 1976 |
| Apr | 94.5 mm (3.7 in) | 21 April 1973 |
| May | 109.7 mm (4.3 in) | 28 May 1955 |
| Jun | 115.8 mm (4.6 in) | 15 June 1968 |
| Jul | 153.9 mm (6.1 in) | 1 July 1993 |
| Aug | 115.6 mm (4.6 in) | 8 August 1943 |
| Sep | 105.2 mm (4.1 in) | 24 September 1970 |
| Oct | 89.2 mm (3.5 in) | 5 October 1955 |
| Nov | 61.0 mm (2.4 in) | 30 November 2006 |
| Dec | 95.3 mm (3.8 in) | 3 December 1982 |
Period of Record Coverage
1937 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1937 | 244 | 67% | No |
| 1938 | 359 | 98% | Yes |
| 1939 | 363 | 99% | Yes |
| 1940 | 364 | 99% | Yes |
| 1941 | 363 | 99% | Yes |
| 1942 | 361 | 99% | Yes |
| 1943 | 355 | 97% | Yes |
| 1944 | 362 | 99% | Yes |
| 1945 | 358 | 98% | Yes |
| 1946 | 330 | 90% | Yes |
| 1947 | 357 | 98% | Yes |
| 1948 | 133 | 36% | No |
| 1967 | 30 | 8% | No |
| 1970 | 29 | 8% | No |
| 1974 | 25 | 7% | No |
| 1976 | 28 | 8% | No |
| 1977 | 305 | 84% | No |
| 1978 | 364 | 100% | Yes |
| 1979 | 365 | 100% | Yes |
| 1980 | 366 | 100% | Yes |
| 1981 | 365 | 100% | Yes |
| 1982 | 360 | 99% | Yes |
| 1983 | 333 | 91% | Yes |
| 1984 | 334 | 91% | Yes |
| 1985 | 302 | 83% | No |
| 1986 | 119 | 33% | No |
| 1987 | 28 | 8% | No |
| 1988 | 306 | 84% | No |
| 1989 | 300 | 82% | No |
| 1990 | 332 | 91% | Yes |
| 1991 | 361 | 99% | Yes |
| 1992 | 366 | 100% | Yes |
| 1993 | 242 | 66% | No |
| 1995 | 92 | 25% | No |
| 1996 | 364 | 99% | Yes |
| 1997 | 363 | 99% | Yes |
| 1998 | 363 | 99% | Yes |
| 1999 | 363 | 99% | Yes |
| 2000 | 363 | 99% | Yes |
| 2001 | 359 | 98% | Yes |
| 2002 | 365 | 100% | Yes |
| 2003 | 334 | 92% | Yes |
| 2004 | 301 | 82% | No |
| 2005 | 362 | 99% | Yes |
| 2006 | 363 | 99% | Yes |
| 2007 | 356 | 98% | Yes |
| 2008 | 361 | 99% | Yes |
| 2009 | 357 | 98% | Yes |
| 2010 | 365 | 100% | Yes |
| 2011 | 290 | 79% | No |
| 2012 | 333 | 91% | Yes |
| 2013 | 332 | 91% | Yes |
| 2014 | 318 | 87% | No |
| 2015 | 286 | 78% | No |
| 2016 | 343 | 94% | Yes |
| 2017 | 346 | 95% | Yes |
| 2018 | 350 | 96% | Yes |
| 2019 | 327 | 90% | No |
| 2020 | 325 | 89% | No |
| 2021 | 338 | 93% | Yes |
| 2022 | 335 | 92% | Yes |
| 2023 | 335 | 92% | Yes |
| 2024 | 336 | 92% | Yes |
| 2025 | 334 | 92% | Yes |
| 2026 | 239 | 65% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 15 October 2026 | Quincy Dam 21, US | daily high min (Provisional) | 17.2 C (63.0 F) | 1.1 C (2.0 F) | 88 years | 37 of 100 (Notable) |
| 14 October 2026 | Quincy Dam 21, US | daily high min (Provisional) | 18.9 C (66.0 F) | 3.3 C (5.9 F) | 84 years | 40 of 100 (Notable) |
| 14 October 2026 | Quincy Dam 21, US | daily high max (Provisional) | 33.3 C (91.9 F) | 1.6 C (2.9 F) | 88 years | 37 of 100 (Notable) |
| 13 October 2026 | Quincy Dam 21, US | daily high max (Provisional) | 33.3 C (91.9 F) | 2.2 C (4.0 F) | 1 year | 12 of 100 (Routine) |
| 12 October 2026 | Quincy Dam 21, US | daily high max (Provisional) | 33.3 C (91.9 F) | 2.7 C (4.9 F) | 36 years | 24 of 100 (Routine) |
| 11 October 2026 | Quincy Dam 21, US | daily high max (Provisional) | 31.7 C (89.1 F) | 2.8 C (5.0 F) | 1 year | 13 of 100 (Routine) |
| 10 October 2026 | Quincy Dam 21, US | daily high max (Provisional) | 32.8 C (91.0 F) | 1.7 C (3.1 F) | 83 years | 35 of 100 (Notable) |
| 20 September 2026 | Quincy Dam 21, US | daily high min (Provisional) | 22.8 C (73.0 F) | 2.2 C (4.0 F) | 48 years | 27 of 100 (Routine) |
| 19 September 2026 | Quincy Dam 21, US | daily high min (Provisional) | 22.8 C (73.0 F) | 1.1 C (2.0 F) | 37 years | 22 of 100 (Routine) |
| 18 September 2026 | Quincy Dam 21, US | daily high max (Provisional) | 35.6 C (96.1 F) | 1.2 C (2.2 F) | 79 years | 34 of 100 (Routine) |
| 18 September 2026 | Quincy Dam 21, US | daily high min (Tie, Provisional) | 22.2 C (72.0 F) | tie | 84 years | 8 of 100 (Routine) |
| 17 September 2026 | Quincy Dam 21, US | daily high max (Provisional) | 35.0 C (95.0 F) | 0.6 C (1.1 F) | 28 years | 18 of 100 (Routine) |
| 16 September 2026 | Quincy Dam 21, US | daily rain (Provisional) | 53.1 mm (2.1 in) | 10.7 mm (0.4 in) | 48 years | 29 of 100 (Routine) |
| 9 September 2026 | Quincy Dam 21, US | daily high max (Provisional) | 37.8 C (100.0 F) | 2.8 C (5.0 F) | 45 years | 27 of 100 (Routine) |
| 6 September 2026 | Quincy Dam 21, US | daily high min (Provisional) | 23.3 C (73.9 F) | 0.5 C (0.9 F) | 8 years | 12 of 100 (Routine) |
| 5 September 2026 | Quincy Dam 21, US | daily high max (Provisional) | 38.3 C (100.9 F) | 2.7 C (4.9 F) | 36 years | 24 of 100 (Routine) |
| 5 September 2026 | Quincy Dam 21, US | daily high min (Tie, Provisional) | 23.3 C (73.9 F) | tie | 12 years | 3 of 100 (Routine) |
| 4 September 2026 | Quincy Dam 21, US | daily high max (Provisional) | 38.9 C (102.0 F) | 1.1 C (2.0 F) | 79 years | 34 of 100 (Routine) |
| 3 September 2026 | Quincy Dam 21, US | daily high max (Provisional) | 38.3 C (100.9 F) | 0.5 C (0.9 F) | 15 years | 14 of 100 (Routine) |
| 1 September 2026 | Quincy Dam 21, US | daily high max (Provisional) | 37.8 C (100.0 F) | 0.6 C (1.1 F) | 12 years | 13 of 100 (Routine) |
Climate Trend
41 complete years, 1938 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1938 | 13.6 C | +1.52 C |
| 1939 | 13.2 C | +1.16 C |
| 1940 | 11.5 C | -0.57 C |
| 1941 | 13.7 C | +1.64 C |
| 1942 | 12.2 C | +0.18 C |
| 1944 | 12.3 C | +0.22 C |
| 1945 | 11.6 C | -0.48 C |
| 1947 | 12.3 C | +0.21 C |
| 1978 | 9.7 C | -2.40 C |
| 1979 | 9.8 C | -2.25 C |
| 1980 | 10.7 C | -1.32 C |
| 1981 | 11.2 C | -0.81 C |
| 1982 | 10.3 C | -1.76 C |
| 1991 | 12.2 C | +0.18 C |
| 1992 | 11.6 C | -0.50 C |
| 1996 | 10.5 C | -1.59 C |
| 1997 | 11.3 C | -0.79 C |
| 1998 | 13.4 C | +1.31 C |
| 1999 | 12.6 C | +0.56 C |
| 2000 | 11.9 C | -0.13 C |
| 2001 | 12.4 C | +0.32 C |
| 2002 | 12.3 C | +0.25 C |
| 2005 | 12.8 C | +0.78 C |
| 2006 | 12.9 C | +0.81 C |
| 2007 | 12.6 C | +0.55 C |
| 2008 | 11.0 C | -1.01 C |
| 2009 | 11.4 C | -0.67 C |
| 2010 | 12.1 C | +0.04 C |
| 2012 | 13.9 C | +1.89 C |
| 2013 | 11.2 C | -0.81 C |
| 2014 | 10.4 C | -1.67 C |
| 2016 | 13.4 C | +1.34 C |
| 2017 | 13.1 C | +1.04 C |
| 2018 | 12.2 C | +0.18 C |
| 2019 | 11.8 C | -0.22 C |
| 2020 | 11.8 C | -0.21 C |
| 2021 | 12.4 C | +0.38 C |
| 2022 | 11.5 C | -0.58 C |
| 2023 | 13.1 C | +1.01 C |
| 2024 | 13.6 C | +1.50 C |
| 2025 | 12.8 C | +0.75 C |
The fitted trend in annual mean temperature here over 1938 to 2025 is 0.01 C (-0.11 to 0.14) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.02 F (-0.20 to 0.24) per decade. The slope is a straight line fitted to 41 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.01 C (-0.11 to 0.14) per decade | 0.02 F (-0.20 to 0.24) per decade | 1938 to 2025 | 41 | Not clearly different from zero |
| Mean daily maximum | 0.04 C (-0.08 to 0.16) per decade | 0.1 F (-0.1 to 0.3) per decade | 1938 to 2025 | 41 | Not clearly different from zero |
| Mean daily minimum | -0.01 C (-0.15 to 0.13) per decade | -0.02 F (-0.27 to 0.23) per decade | 1938 to 2025 | 41 | 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
1937 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 40.6 C (105.1 F) | 2003 | 37.2 C (99.0 F) | 65 |
| Coldest night (TNn) | -29.4 C (-20.9 F) | 1979 | -20.6 C (-5.1 F) | 64 |
| Wettest day (Rx1day) | 153.9 mm (6.1 in) | 1993 | 58.7 mm (2.3 in) | 89 |
| Wettest five days (Rx5day) | 222.5 mm (8.8 in) | 1949 | 95.8 mm (3.8 in) | 89 |
| Longest dry spell (CDD) | 44 days | 1999 | 22 days | 89 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1937 | 39.4 C (102.9 F) |
| 1938 | 38.3 C (100.9 F) |
| 1939 | 38.3 C (100.9 F) |
| 1940 | 38.9 C (102.0 F) |
| 1941 | 38.9 C (102.0 F) |
| 1942 | 36.7 C (98.1 F) |
| 1943 | 38.3 C (100.9 F) |
| 1944 | 37.2 C (99.0 F) |
| 1945 | 36.7 C (98.1 F) |
| 1946 | 36.7 C (98.1 F) |
| 1947 | 38.9 C (102.0 F) |
| 1948 | 30.6 C (87.1 F) |
| 1949 | n/a |
| 1950 | n/a |
| 1951 | n/a |
| 1952 | n/a |
| 1953 | n/a |
| 1954 | n/a |
| 1955 | n/a |
| 1956 | n/a |
| 1957 | n/a |
| 1958 | n/a |
| 1959 | n/a |
| 1960 | n/a |
| 1961 | n/a |
| 1962 | n/a |
| 1963 | n/a |
| 1964 | n/a |
| 1965 | n/a |
| 1966 | n/a |
| 1967 | 29.4 C (84.9 F) |
| 1968 | n/a |
| 1969 | n/a |
| 1970 | 33.9 C (93.0 F) |
| 1971 | n/a |
| 1972 | n/a |
| 1973 | n/a |
| 1974 | 32.8 C (91.0 F) |
| 1975 | n/a |
| 1976 | 28.3 C (82.9 F) |
| 1977 | 37.8 C (100.0 F) |
| 1978 | 36.7 C (98.1 F) |
| 1979 | 36.7 C (98.1 F) |
| 1980 | 40.0 C (104.0 F) |
| 1981 | 35.6 C (96.1 F) |
| 1982 | 36.1 C (97.0 F) |
| 1983 | 38.3 C (100.9 F) |
| 1984 | 39.4 C (102.9 F) |
| 1985 | 34.4 C (93.9 F) |
| 1986 | 33.3 C (91.9 F) |
| 1987 | 26.7 C (80.1 F) |
| 1988 | 39.4 C (102.9 F) |
| 1989 | 37.8 C (100.0 F) |
| 1990 | 37.8 C (100.0 F) |
| 1991 | 37.2 C (99.0 F) |
| 1992 | 34.4 C (93.9 F) |
| 1993 | 37.8 C (100.0 F) |
| 1995 | 30.0 C (86.0 F) |
| 1996 | 36.7 C (98.1 F) |
| 1997 | 37.8 C (100.0 F) |
| 1998 | 36.7 C (98.1 F) |
| 1999 | 38.9 C (102.0 F) |
| 2000 | 36.7 C (98.1 F) |
| 2001 | 38.3 C (100.9 F) |
| 2002 | 36.7 C (98.1 F) |
| 2003 | 40.6 C (105.1 F) |
| 2004 | 36.7 C (98.1 F) |
| 2005 | 40.6 C (105.1 F) |
| 2006 | 39.4 C (102.9 F) |
| 2007 | 37.8 C (100.0 F) |
| 2008 | 35.6 C (96.1 F) |
| 2009 | 37.2 C (99.0 F) |
| 2010 | 37.2 C (99.0 F) |
| 2011 | 40.0 C (104.0 F) |
| 2012 | 40.0 C (104.0 F) |
| 2013 | 38.3 C (100.9 F) |
| 2014 | 36.7 C (98.1 F) |
| 2015 | 35.0 C (95.0 F) |
| 2016 | 36.7 C (98.1 F) |
| 2017 | 36.7 C (98.1 F) |
| 2018 | 36.7 C (98.1 F) |
| 2019 | 35.0 C (95.0 F) |
| 2020 | 35.0 C (95.0 F) |
| 2021 | 36.7 C (98.1 F) |
| 2022 | 37.2 C (99.0 F) |
| 2023 | 39.4 C (102.9 F) |
| 2024 | 37.2 C (99.0 F) |
| 2025 | 36.1 C (97.0 F) |
| 2026 | 38.9 C (102.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1937 | -15.6 C (3.9 F) |
| 1938 | -17.2 C (1.0 F) |
| 1939 | -17.8 C (0.0 F) |
| 1940 | -25.6 C (-14.1 F) |
| 1941 | -15.6 C (3.9 F) |
| 1942 | -21.7 C (-7.1 F) |
| 1943 | -25.0 C (-13.0 F) |
| 1944 | -20.6 C (-5.1 F) |
| 1945 | -24.4 C (-11.9 F) |
| 1946 | -16.1 C (3.0 F) |
| 1947 | -21.1 C (-6.0 F) |
| 1948 | -22.2 C (-8.0 F) |
| 1949 | n/a |
| 1950 | n/a |
| 1951 | n/a |
| 1952 | n/a |
| 1953 | n/a |
| 1954 | n/a |
| 1955 | n/a |
| 1956 | n/a |
| 1957 | n/a |
| 1958 | n/a |
| 1959 | n/a |
| 1960 | n/a |
| 1961 | n/a |
| 1962 | n/a |
| 1963 | n/a |
| 1964 | n/a |
| 1965 | n/a |
| 1966 | n/a |
| 1967 | 2.8 C (37.0 F) |
| 1968 | n/a |
| 1969 | n/a |
| 1970 | 14.4 C (57.9 F) |
| 1971 | n/a |
| 1972 | n/a |
| 1973 | n/a |
| 1974 | 10.0 C (50.0 F) |
| 1975 | n/a |
| 1976 | n/a |
| 1977 | -19.4 C (-2.9 F) |
| 1978 | -25.0 C (-13.0 F) |
| 1979 | -29.4 C (-20.9 F) |
| 1980 | -22.2 C (-8.0 F) |
| 1981 | -24.4 C (-11.9 F) |
| 1982 | -28.9 C (-20.0 F) |
| 1983 | -27.8 C (-18.0 F) |
| 1984 | -24.4 C (-11.9 F) |
| 1985 | -27.8 C (-18.0 F) |
| 1986 | -21.7 C (-7.1 F) |
| 1987 | -2.8 C (27.0 F) |
| 1988 | -21.7 C (-7.1 F) |
| 1989 | -20.6 C (-5.1 F) |
| 1990 | -17.8 C (0.0 F) |
| 1991 | -20.0 C (-4.0 F) |
| 1992 | -15.0 C (5.0 F) |
| 1993 | -18.9 C (-2.0 F) |
| 1995 | -17.2 C (1.0 F) |
| 1996 | -26.7 C (-16.1 F) |
| 1997 | -23.3 C (-9.9 F) |
| 1998 | -18.9 C (-2.0 F) |
| 1999 | -28.9 C (-20.0 F) |
| 2000 | -20.0 C (-4.0 F) |
| 2001 | -20.6 C (-5.1 F) |
| 2002 | -17.2 C (1.0 F) |
| 2003 | -19.4 C (-2.9 F) |
| 2004 | -20.6 C (-5.1 F) |
| 2005 | -18.3 C (-0.9 F) |
| 2006 | -18.3 C (-0.9 F) |
| 2007 | -20.6 C (-5.1 F) |
| 2008 | -17.8 C (0.0 F) |
| 2009 | -21.1 C (-6.0 F) |
| 2010 | -23.9 C (-11.0 F) |
| 2011 | -22.2 C (-8.0 F) |
| 2012 | -13.3 C (8.1 F) |
| 2013 | -17.8 C (0.0 F) |
| 2014 | -24.4 C (-11.9 F) |
| 2015 | -18.3 C (-0.9 F) |
| 2016 | -21.1 C (-6.0 F) |
| 2017 | -20.0 C (-4.0 F) |
| 2018 | -23.3 C (-9.9 F) |
| 2019 | -24.4 C (-11.9 F) |
| 2020 | -20.0 C (-4.0 F) |
| 2021 | -21.1 C (-6.0 F) |
| 2022 | -22.2 C (-8.0 F) |
| 2023 | -15.0 C (5.0 F) |
| 2024 | -25.0 C (-13.0 F) |
| 2025 | -21.1 C (-6.0 F) |
| 2026 | -20.0 C (-4.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1937 | 71.1 mm (2.8 in) |
| 1938 | 50.3 mm (2.0 in) |
| 1939 | 56.1 mm (2.2 in) |
| 1940 | 58.4 mm (2.3 in) |
| 1941 | 52.1 mm (2.1 in) |
| 1942 | 57.2 mm (2.3 in) |
| 1943 | 115.6 mm (4.6 in) |
| 1944 | 87.1 mm (3.4 in) |
| 1945 | 58.7 mm (2.3 in) |
| 1946 | 85.3 mm (3.4 in) |
| 1947 | 96.3 mm (3.8 in) |
| 1948 | 57.4 mm (2.3 in) |
| 1949 | 148.1 mm (5.8 in) |
| 1950 | 57.9 mm (2.3 in) |
| 1951 | 49.3 mm (1.9 in) |
| 1952 | 41.1 mm (1.6 in) |
| 1953 | 35.1 mm (1.4 in) |
| 1954 | 52.3 mm (2.1 in) |
| 1955 | 109.7 mm (4.3 in) |
| 1956 | 46.0 mm (1.8 in) |
| 1957 | 87.6 mm (3.4 in) |
| 1958 | 85.6 mm (3.4 in) |
| 1959 | 35.3 mm (1.4 in) |
| 1960 | 50.3 mm (2.0 in) |
| 1961 | 90.2 mm (3.6 in) |
| 1962 | 47.0 mm (1.9 in) |
| 1963 | 66.0 mm (2.6 in) |
| 1964 | 52.6 mm (2.1 in) |
| 1965 | 86.9 mm (3.4 in) |
| 1966 | 50.8 mm (2.0 in) |
| 1967 | 50.8 mm (2.0 in) |
| 1968 | 115.8 mm (4.6 in) |
| 1969 | 65.8 mm (2.6 in) |
| 1970 | 105.2 mm (4.1 in) |
| 1971 | 39.1 mm (1.5 in) |
| 1972 | 41.7 mm (1.6 in) |
| 1973 | 94.5 mm (3.7 in) |
| 1974 | 53.3 mm (2.1 in) |
| 1975 | 64.0 mm (2.5 in) |
| 1976 | 50.3 mm (2.0 in) |
| 1977 | 100.3 mm (3.9 in) |
| 1978 | 83.1 mm (3.3 in) |
| 1979 | 40.6 mm (1.6 in) |
| 1980 | 43.9 mm (1.7 in) |
| 1981 | 62.7 mm (2.5 in) |
| 1982 | 105.4 mm (4.1 in) |
| 1983 | 66.0 mm (2.6 in) |
| 1984 | 71.4 mm (2.8 in) |
| 1985 | 64.3 mm (2.5 in) |
| 1986 | 15.7 mm (0.6 in) |
| 1987 | 5.6 mm (0.22 in) |
| 1988 | 39.6 mm (1.6 in) |
| 1989 | 58.2 mm (2.3 in) |
| 1990 | 66.0 mm (2.6 in) |
| 1991 | 67.3 mm (2.6 in) |
| 1992 | 69.9 mm (2.8 in) |
| 1993 | 153.9 mm (6.1 in) |
| 1995 | 34.0 mm (1.3 in) |
| 1996 | 53.6 mm (2.1 in) |
| 1997 | 83.1 mm (3.3 in) |
| 1998 | 52.6 mm (2.1 in) |
| 1999 | 50.8 mm (2.0 in) |
| 2000 | 38.9 mm (1.5 in) |
| 2001 | 44.5 mm (1.8 in) |
| 2002 | 54.1 mm (2.1 in) |
| 2003 | 80.0 mm (3.1 in) |
| 2004 | 89.4 mm (3.5 in) |
| 2005 | 43.2 mm (1.7 in) |
| 2006 | 61.0 mm (2.4 in) |
| 2007 | 68.6 mm (2.7 in) |
| 2008 | 76.2 mm (3.0 in) |
| 2009 | 63.5 mm (2.5 in) |
| 2010 | 56.1 mm (2.2 in) |
| 2011 | 54.6 mm (2.1 in) |
| 2012 | 71.1 mm (2.8 in) |
| 2013 | 83.8 mm (3.3 in) |
| 2014 | 82.6 mm (3.3 in) |
| 2015 | 61.7 mm (2.4 in) |
| 2016 | 51.1 mm (2.0 in) |
| 2017 | 54.4 mm (2.1 in) |
| 2018 | 65.0 mm (2.6 in) |
| 2019 | 56.4 mm (2.2 in) |
| 2020 | 50.8 mm (2.0 in) |
| 2021 | 79.0 mm (3.1 in) |
| 2022 | 79.2 mm (3.1 in) |
| 2023 | 42.9 mm (1.7 in) |
| 2024 | 49.5 mm (1.9 in) |
| 2025 | 92.7 mm (3.6 in) |
| 2026 | 89.2 mm (3.5 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1937 | 131.3 mm (5.2 in) |
| 1938 | 91.7 mm (3.6 in) |
| 1939 | 136.1 mm (5.4 in) |
| 1940 | 65.8 mm (2.6 in) |
| 1941 | 125.0 mm (4.9 in) |
| 1942 | 73.6 mm (2.9 in) |
| 1943 | 124.5 mm (4.9 in) |
| 1944 | 99.0 mm (3.9 in) |
| 1945 | 108.5 mm (4.3 in) |
| 1946 | 107.4 mm (4.2 in) |
| 1947 | 102.7 mm (4.0 in) |
| 1948 | 71.1 mm (2.8 in) |
| 1949 | 222.5 mm (8.8 in) |
| 1950 | 76.7 mm (3.0 in) |
| 1951 | 62.5 mm (2.5 in) |
| 1952 | 52.3 mm (2.1 in) |
| 1953 | 46.3 mm (1.8 in) |
| 1954 | 75.9 mm (3.0 in) |
| 1955 | 140.2 mm (5.5 in) |
| 1956 | 59.6 mm (2.3 in) |
| 1957 | 108.0 mm (4.3 in) |
| 1958 | 110.7 mm (4.4 in) |
| 1959 | 74.7 mm (2.9 in) |
| 1960 | 100.6 mm (4.0 in) |
| 1961 | 158.5 mm (6.2 in) |
| 1962 | 65.8 mm (2.6 in) |
| 1963 | 123.4 mm (4.9 in) |
| 1964 | 80.3 mm (3.2 in) |
| 1965 | 108.7 mm (4.3 in) |
| 1966 | 93.0 mm (3.7 in) |
| 1967 | 84.5 mm (3.3 in) |
| 1968 | 126.0 mm (5.0 in) |
| 1969 | 178.5 mm (7.0 in) |
| 1970 | 206.3 mm (8.1 in) |
| 1971 | 45.5 mm (1.8 in) |
| 1972 | 98.3 mm (3.9 in) |
| 1973 | 119.4 mm (4.7 in) |
| 1974 | 75.4 mm (3.0 in) |
| 1975 | 86.3 mm (3.4 in) |
| 1976 | 65.5 mm (2.6 in) |
| 1977 | 123.7 mm (4.9 in) |
| 1978 | 95.8 mm (3.8 in) |
| 1979 | 67.3 mm (2.6 in) |
| 1980 | 103.6 mm (4.1 in) |
| 1981 | 142.3 mm (5.6 in) |
| 1982 | 152.2 mm (6.0 in) |
| 1983 | 91.6 mm (3.6 in) |
| 1984 | 78.2 mm (3.1 in) |
| 1985 | 114.4 mm (4.5 in) |
| 1986 | 33.7 mm (1.3 in) |
| 1987 | 10.7 mm (0.4 in) |
| 1988 | 49.6 mm (2.0 in) |
| 1989 | 83.8 mm (3.3 in) |
| 1990 | 87.4 mm (3.4 in) |
| 1991 | 116.3 mm (4.6 in) |
| 1992 | 96.5 mm (3.8 in) |
| 1993 | 171.9 mm (6.8 in) |
| 1995 | 54.3 mm (2.1 in) |
| 1996 | 94.9 mm (3.7 in) |
| 1997 | 92.8 mm (3.7 in) |
| 1998 | 83.3 mm (3.3 in) |
| 1999 | 67.1 mm (2.6 in) |
| 2000 | 82.3 mm (3.2 in) |
| 2001 | 72.7 mm (2.9 in) |
| 2002 | 136.7 mm (5.4 in) |
| 2003 | 124.5 mm (4.9 in) |
| 2004 | 176.0 mm (6.9 in) |
| 2005 | 56.7 mm (2.2 in) |
| 2006 | 85.2 mm (3.4 in) |
| 2007 | 87.9 mm (3.5 in) |
| 2008 | 107.5 mm (4.2 in) |
| 2009 | 109.2 mm (4.3 in) |
| 2010 | 99.3 mm (3.9 in) |
| 2011 | 68.6 mm (2.7 in) |
| 2012 | 79.5 mm (3.1 in) |
| 2013 | 138.0 mm (5.4 in) |
| 2014 | 128.3 mm (5.1 in) |
| 2015 | 141.9 mm (5.6 in) |
| 2016 | 77.5 mm (3.1 in) |
| 2017 | 88.7 mm (3.5 in) |
| 2018 | 85.7 mm (3.4 in) |
| 2019 | 101.1 mm (4.0 in) |
| 2020 | 110.0 mm (4.3 in) |
| 2021 | 137.2 mm (5.4 in) |
| 2022 | 109.2 mm (4.3 in) |
| 2023 | 58.2 mm (2.3 in) |
| 2024 | 116.3 mm (4.6 in) |
| 2025 | 96.8 mm (3.8 in) |
| 2026 | 63.6 mm (2.5 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1937 | 19 days |
| 1938 | 23 days |
| 1939 | 37 days |
| 1940 | 25 days |
| 1941 | 31 days |
| 1942 | 29 days |
| 1943 | 28 days |
| 1944 | 28 days |
| 1945 | 26 days |
| 1946 | 22 days |
| 1947 | 29 days |
| 1948 | 25 days |
| 1949 | 17 days |
| 1950 | 29 days |
| 1951 | 14 days |
| 1952 | 27 days |
| 1953 | 23 days |
| 1954 | 23 days |
| 1955 | 29 days |
| 1956 | 29 days |
| 1957 | 23 days |
| 1958 | 32 days |
| 1959 | 25 days |
| 1960 | 27 days |
| 1961 | 15 days |
| 1962 | 18 days |
| 1963 | 34 days |
| 1964 | 29 days |
| 1965 | 20 days |
| 1966 | 19 days |
| 1967 | 25 days |
| 1968 | 17 days |
| 1969 | 18 days |
| 1970 | 16 days |
| 1971 | 28 days |
| 1972 | 18 days |
| 1973 | 19 days |
| 1974 | 15 days |
| 1975 | 14 days |
| 1976 | 26 days |
| 1977 | 18 days |
| 1978 | 22 days |
| 1979 | 30 days |
| 1980 | 22 days |
| 1981 | 16 days |
| 1982 | 17 days |
| 1983 | 25 days |
| 1984 | 22 days |
| 1985 | 17 days |
| 1986 | 25 days |
| 1987 | 16 days |
| 1988 | 27 days |
| 1989 | 22 days |
| 1990 | 16 days |
| 1991 | 24 days |
| 1992 | 20 days |
| 1993 | 21 days |
| 1995 | 24 days |
| 1996 | 22 days |
| 1997 | 23 days |
| 1998 | 19 days |
| 1999 | 44 days |
| 2000 | 18 days |
| 2001 | 16 days |
| 2002 | 32 days |
| 2003 | 13 days |
| 2004 | 37 days |
| 2005 | 21 days |
| 2006 | 34 days |
| 2007 | 18 days |
| 2008 | 20 days |
| 2009 | 18 days |
| 2010 | 27 days |
| 2011 | 18 days |
| 2012 | 21 days |
| 2013 | 34 days |
| 2014 | 21 days |
| 2015 | 15 days |
| 2016 | 21 days |
| 2017 | 21 days |
| 2018 | 26 days |
| 2019 | 16 days |
| 2020 | 20 days |
| 2021 | 23 days |
| 2022 | 17 days |
| 2023 | 21 days |
| 2024 | 27 days |
| 2025 | 26 days |
| 2026 | 20 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
41 years with a frostAcross 41 years with a frost, the median last spring frost at Quincy Dam 21 falls on 9 April and the median first autumn frost on 28 October, which leaves a median of 201 days between them.
Fitted over all years, the growing season changes by -0.3 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1981 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 9 April | n/a | 10 April | n/a | +0.5 days per decade |
| First autumn frost | 28 October | n/a | 28 October | n/a | +0.2 days per decade |
| Growing days | 201 days | n/a | 200 days | n/a | -0.3 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
77 years, 1938 to 2025A day with at least 61.5 mm (2.4 in) of rain is expected about once in 2 years. A day with at least 145.8 mm (5.7 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 61.5 mm (2.4 in) | |
| 5 years | 81.1 mm (3.2 in) | |
| 10 years | 95.2 mm (3.7 in) | |
| 25 years | 114.4 mm (4.5 in) | |
| 50 years | 129.7 mm (5.1 in) | |
| 100 years | 145.8 mm (5.7 in) | Longer than the 77 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, 77 years of values from 1938 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: 148.1 mm (5.8 in) in 1949; 115.8 mm (4.6 in) in 1968; 115.6 mm (4.6 in) in 1943.
Station Changes
2 suspected2 changes were suspected in the annual mean temperature of Quincy Dam 21, at 1992 and 2020. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1992 ran 0.3 C (0.6 F) higher than in the years before (possible change).
- Relative to 5 neighbouring stations, the station's annual mean temperature from 2020 ran 0.3 C (0.5 F) lower than in the years before (likely change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 1992 | +0.3 | +0.6 | possible | 5 |
| 2020 | -0.3 | -0.5 | 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.
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 2026-10-17 (17 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-18).