McHenry Stratton Lock/Dam Weather Records (USC00115493)
Record envelope, standing records and threshold days for McHenry Stratton Lock/Dam (USC00115493), Illinois, United States, with 79 years of record.
Key Facts for McHenry Stratton Lock/Dam
- McHenry Stratton Lock/Dam (USC00115493) is a weather station in Illinois, United States at 42.31 latitude and -88.25 longitude, 224 m (736 ft) above sea level.
- The station reports from 1948 to 2026, 79 years of record.
- 1,464 records set at McHenry Stratton Lock/Dam still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- McHenry Stratton Lock/Dam set a daily record high minimum temperature of 17.2 C (63.0 F) on 13 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, 42.31 latitude, -88.25 longitude.
- Elevation: 224 m (736 ft).
- Period of record: 1948 to 2026, 79 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
20 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 16.7 C (62.1 F) | -35.6 C (-32.1 F) | 15.6 C (60.1 F) | -25.6 C (-14.1 F) |
| Feb | 25.6 C (78.1 F) | -30.6 C (-23.1 F) | 18.9 C (66.0 F) | -18.9 C (-2.0 F) |
| Mar | 28.3 C (82.9 F) | -25.0 C (-13.0 F) | 27.8 C (82.0 F) | -13.3 C (8.1 F) |
| Apr | 32.2 C (90.0 F) | -10.0 C (14.0 F) | 28.9 C (84.0 F) | -4.4 C (24.1 F) |
| May | 37.2 C (99.0 F) | -3.3 C (26.1 F) | 31.1 C (88.0 F) | -1.1 C (30.0 F) |
| Jun | 37.8 C (100.0 F) | 1.7 C (35.1 F) | 34.4 C (93.9 F) | 7.2 C (45.0 F) |
| Jul | 38.3 C (100.9 F) | 6.7 C (44.1 F) | 35.0 C (95.0 F) | 9.4 C (48.9 F) |
| Aug | 36.7 C (98.1 F) | 4.4 C (39.9 F) | 31.7 C (89.1 F) | 10.6 C (51.1 F) |
| Sep | 35.6 C (96.1 F) | -2.2 C (28.0 F) | 35.0 C (95.0 F) | 6.7 C (44.1 F) |
| Oct | 32.2 C (90.0 F) | -5.6 C (21.9 F) | 32.2 C (90.0 F) | 5.6 C (42.1 F) |
| Nov | 25.6 C (78.1 F) | -15.6 C (3.9 F) | n/a | n/a |
| Dec | 20.0 C (68.0 F) | -28.3 C (-18.9 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1992 | 2 |
| 1993 | 31 |
| 1994 | 60 |
| 1995 | 56 |
| 1996 | 62 |
| 1997 | 44 |
| 1998 | 43 |
| 1999 | 43 |
| 2000 | 56 |
| 2001 | 37 |
| 2002 | 40 |
| 2003 | 32 |
| 2004 | 43 |
| 2005 | 40 |
| 2006 | 46 |
| 2007 | 40 |
| 2008 | 28 |
| 2009 | 38 |
| 2010 | 25 |
| 2011 | 23 |
| 2012 | 63 |
| 2013 | 48 |
| 2014 | 62 |
| 2015 | 48 |
| 2016 | 24 |
| 2017 | 55 |
| 2018 | 52 |
| 2019 | 45 |
| 2020 | 42 |
| 2021 | 50 |
| 2022 | 35 |
| 2023 | 41 |
| 2024 | 46 |
| 2025 | 41 |
| 2026 | 23 |
All-Time Record Progression
1 new records| Date | Kind | Detail |
|---|---|---|
| 2011-02-02 | Record daily snowfall | Record daily snowfall 43.9 cm (17.3 in) |
Wettest Day of Each Month
Jul: 121.2 mm (4.8 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 43.7 mm (1.7 in) | 14 January 1995 |
| Feb | 52.3 mm (2.1 in) | 21 February 1997 |
| Mar | 72.9 mm (2.9 in) | 5 March 1976 |
| Apr | 96.8 mm (3.8 in) | 18 April 2013 |
| May | 72.1 mm (2.8 in) | 18 May 2004 |
| Jun | 111.8 mm (4.4 in) | 26 June 2013 |
| Jul | 121.2 mm (4.8 in) | 15 July 1985 |
| Aug | 116.3 mm (4.6 in) | 14 August 1987 |
| Sep | 115.6 mm (4.6 in) | 12 September 2019 |
| Oct | 68.1 mm (2.7 in) | 18 October 1998 |
| Nov | 46.0 mm (1.8 in) | 11 November 1995 |
| Dec | 43.2 mm (1.7 in) | 10 December 2003 |
Period of Record Coverage
1992 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1992 | 30 | 8% | No |
| 1993 | 304 | 83% | No |
| 1994 | 365 | 100% | Yes |
| 1995 | 365 | 100% | Yes |
| 1996 | 366 | 100% | Yes |
| 1997 | 365 | 100% | Yes |
| 1998 | 365 | 100% | Yes |
| 1999 | 365 | 100% | Yes |
| 2000 | 335 | 92% | Yes |
| 2001 | 333 | 91% | Yes |
| 2002 | 273 | 75% | No |
| 2003 | 330 | 90% | Yes |
| 2004 | 341 | 93% | Yes |
| 2005 | 365 | 100% | Yes |
| 2006 | 365 | 100% | Yes |
| 2007 | 365 | 100% | Yes |
| 2008 | 366 | 100% | Yes |
| 2009 | 365 | 100% | Yes |
| 2010 | 365 | 100% | Yes |
| 2011 | 365 | 100% | Yes |
| 2012 | 366 | 100% | Yes |
| 2013 | 363 | 99% | Yes |
| 2014 | 363 | 99% | Yes |
| 2015 | 362 | 99% | Yes |
| 2016 | 365 | 100% | Yes |
| 2017 | 359 | 98% | Yes |
| 2018 | 363 | 99% | Yes |
| 2019 | 363 | 99% | Yes |
| 2020 | 365 | 100% | Yes |
| 2021 | 364 | 100% | Yes |
| 2022 | 360 | 99% | Yes |
| 2023 | 365 | 100% | Yes |
| 2024 | 366 | 100% | Yes |
| 2025 | 365 | 100% | Yes |
| 2026 | 285 | 78% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 13 October 2026 | McHenry Stratton Lock/Dam, US | daily high min (Provisional) | 17.2 C (63.0 F) | 3.9 C (7.0 F) | 28 years | 18 of 100 (Routine) |
| 13 October 2026 | McHenry Stratton Lock/Dam, US | monthly high max (Tie, Provisional) | 32.2 C (90.0 F) | tie | 1 year | 3 of 100 (Routine) |
| 20 September 2026 | McHenry Stratton Lock/Dam, US | daily rain (Provisional) | 49.0 mm (1.9 in) | 22.8 mm (0.9 in) | 28 years | 30 of 100 (Routine) |
| 19 September 2026 | McHenry Stratton Lock/Dam, US | daily rain (Provisional) | 33.5 mm (1.3 in) | 4.0 mm (0.16 in) | 24 years | 16 of 100 (Routine) |
| 5 September 2026 | McHenry Stratton Lock/Dam, US | daily high min (Provisional) | 22.2 C (72.0 F) | 1.6 C (2.9 F) | 8 years | 8 of 100 (Routine) |
| 4 September 2026 | McHenry Stratton Lock/Dam, US | daily high min (Provisional) | 22.2 C (72.0 F) | 2.2 C (4.0 F) | 8 years | 9 of 100 (Routine) |
| 3 September 2026 | McHenry Stratton Lock/Dam, US | monthly high min (Provisional) | 23.3 C (73.9 F) | 1.1 C (2.0 F) | 25 years | 22 of 100 (Routine) |
| 3 September 2026 | McHenry Stratton Lock/Dam, US | daily high max (Provisional) | 34.4 C (93.9 F) | 1.1 C (2.0 F) | 27 years | 13 of 100 (Routine) |
| 2 September 2026 | McHenry Stratton Lock/Dam, US | daily high max (Provisional) | 35.0 C (95.0 F) | 1.1 C (2.0 F) | 25 years | 12 of 100 (Routine) |
| 2 September 2026 | McHenry Stratton Lock/Dam, US | daily high min (Provisional) | 21.7 C (71.1 F) | 1.1 C (2.0 F) | 15 years | 9 of 100 (Routine) |
| 1 September 2026 | McHenry Stratton Lock/Dam, US | daily high min (Provisional) | 21.1 C (70.0 F) | 0.5 C (0.9 F) | 16 years | 8 of 100 (Routine) |
| 16 August 2026 | McHenry Stratton Lock/Dam, US | daily high min | 22.2 C (72.0 F) | 1.1 C (2.0 F) | 23 years | 12 of 100 (Routine) |
| 11 August 2026 | McHenry Stratton Lock/Dam, US | daily high min (Tie) | 22.2 C (72.0 F) | tie | 0 years | 0 of 100 (Routine) |
| 2 August 2026 | McHenry Stratton Lock/Dam, US | daily rain | 29.2 mm (1.1 in) | 19.5 mm (0.8 in) | 12 years | 23 of 100 (Routine) |
| 2 August 2026 | McHenry Stratton Lock/Dam, US | daily low max (Tie) | 21.1 C (70.0 F) | tie | 16 years | 2 of 100 (Routine) |
| 1 August 2026 | McHenry Stratton Lock/Dam, US | daily rain | 47.8 mm (1.9 in) | 35.6 mm (1.4 in) | 31 years | 40 of 100 (Notable) |
| 27 July 2026 | McHenry Stratton Lock/Dam, US | daily high min | 25.0 C (77.0 F) | 2.2 C (4.0 F) | 23 years | 15 of 100 (Routine) |
| 23 July 2026 | McHenry Stratton Lock/Dam, US | daily low min | 9.4 C (48.9 F) | 2.3 C (4.1 F) | 19 years | 14 of 100 (Routine) |
| 2 July 2026 | McHenry Stratton Lock/Dam, US | daily high min | 25.0 C (77.0 F) | 1.1 C (2.0 F) | 15 years | 10 of 100 (Routine) |
| 2 July 2026 | McHenry Stratton Lock/Dam, US | daily high max | 35.0 C (95.0 F) | 0.6 C (1.1 F) | 8 years | 6 of 100 (Routine) |
Climate Trend
27 complete years, 1994 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1994 | 8.3 C | -0.68 C |
| 1995 | 8.3 C | -0.73 C |
| 1996 | 7.1 C | -1.89 C |
| 1997 | 8.0 C | -1.01 C |
| 1998 | 10.7 C | +1.68 C |
| 1999 | 9.4 C | +0.41 C |
| 2005 | 9.1 C | +0.14 C |
| 2006 | 9.4 C | +0.43 C |
| 2007 | 8.9 C | -0.10 C |
| 2008 | 7.7 C | -1.33 C |
| 2009 | 7.8 C | -1.24 C |
| 2010 | 9.2 C | +0.19 C |
| 2011 | 8.7 C | -0.26 C |
| 2012 | 10.3 C | +1.33 C |
| 2013 | 7.5 C | -1.53 C |
| 2014 | 6.5 C | -2.47 C |
| 2015 | 8.9 C | -0.13 C |
| 2016 | 10.0 C | +1.00 C |
| 2017 | 9.9 C | +0.86 C |
| 2018 | 9.1 C | +0.08 C |
| 2019 | 8.7 C | -0.32 C |
| 2020 | 9.9 C | +0.94 C |
| 2021 | 10.0 C | +1.05 C |
| 2022 | 8.8 C | -0.16 C |
| 2023 | 10.2 C | +1.19 C |
| 2024 | 10.9 C | +1.95 C |
| 2025 | 9.5 C | +0.52 C |
This station does not have enough complete years (30 are needed) to fit a temperature trend.
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
1948 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 38.3 C (100.9 F) | 1995 | 35.0 C (95.0 F) | 35 |
| Coldest night (TNn) | -35.6 C (-32.1 F) | 2019 | -25.0 C (-13.0 F) | 35 |
| Wettest day (Rx1day) | 121.2 mm (4.8 in) | 1985 | 58.4 mm (2.3 in) | 55 |
| Wettest five days (Rx5day) | 203.0 mm (8.0 in) | 2013 | 93.8 mm (3.7 in) | 55 |
| Longest dry spell (CDD) | 43 days | 2026 | 20 days | 55 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1948 | n/a |
| 1949 | n/a |
| 1950 | n/a |
| 1951 | n/a |
| 1975 | n/a |
| 1976 | n/a |
| 1977 | n/a |
| 1978 | n/a |
| 1979 | n/a |
| 1980 | n/a |
| 1981 | n/a |
| 1982 | n/a |
| 1983 | n/a |
| 1984 | n/a |
| 1985 | n/a |
| 1986 | n/a |
| 1987 | n/a |
| 1988 | n/a |
| 1989 | n/a |
| 1990 | n/a |
| 1992 | 15.0 C (59.0 F) |
| 1993 | 33.3 C (91.9 F) |
| 1994 | 35.0 C (95.0 F) |
| 1995 | 38.3 C (100.9 F) |
| 1996 | 34.4 C (93.9 F) |
| 1997 | 35.6 C (96.1 F) |
| 1998 | 35.0 C (95.0 F) |
| 1999 | 36.7 C (98.1 F) |
| 2000 | 33.9 C (93.0 F) |
| 2001 | 35.0 C (95.0 F) |
| 2002 | 35.6 C (96.1 F) |
| 2003 | 34.4 C (93.9 F) |
| 2004 | 32.2 C (90.0 F) |
| 2005 | 35.6 C (96.1 F) |
| 2006 | 35.0 C (95.0 F) |
| 2007 | 33.3 C (91.9 F) |
| 2008 | 33.3 C (91.9 F) |
| 2009 | 33.9 C (93.0 F) |
| 2010 | 32.8 C (91.0 F) |
| 2011 | 35.6 C (96.1 F) |
| 2012 | 38.3 C (100.9 F) |
| 2013 | 33.3 C (91.9 F) |
| 2014 | 31.1 C (88.0 F) |
| 2015 | 32.2 C (90.0 F) |
| 2016 | 32.8 C (91.0 F) |
| 2017 | 35.6 C (96.1 F) |
| 2018 | 37.2 C (99.0 F) |
| 2019 | 36.1 C (97.0 F) |
| 2020 | 36.1 C (97.0 F) |
| 2021 | 35.6 C (96.1 F) |
| 2022 | 37.8 C (100.0 F) |
| 2023 | 36.7 C (98.1 F) |
| 2024 | 36.7 C (98.1 F) |
| 2025 | 34.4 C (93.9 F) |
| 2026 | 35.0 C (95.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1948 | n/a |
| 1949 | n/a |
| 1950 | n/a |
| 1951 | n/a |
| 1975 | n/a |
| 1976 | n/a |
| 1977 | n/a |
| 1978 | n/a |
| 1979 | n/a |
| 1980 | n/a |
| 1981 | n/a |
| 1982 | n/a |
| 1983 | n/a |
| 1984 | n/a |
| 1985 | n/a |
| 1986 | n/a |
| 1987 | n/a |
| 1988 | n/a |
| 1989 | n/a |
| 1990 | n/a |
| 1992 | -7.2 C (19.0 F) |
| 1993 | -22.8 C (-9.0 F) |
| 1994 | -32.8 C (-27.0 F) |
| 1995 | -21.7 C (-7.1 F) |
| 1996 | -30.6 C (-23.1 F) |
| 1997 | -25.0 C (-13.0 F) |
| 1998 | -20.6 C (-5.1 F) |
| 1999 | -30.6 C (-23.1 F) |
| 2000 | -28.3 C (-18.9 F) |
| 2001 | -22.8 C (-9.0 F) |
| 2002 | -24.4 C (-11.9 F) |
| 2003 | -22.8 C (-9.0 F) |
| 2004 | -24.4 C (-11.9 F) |
| 2005 | -22.8 C (-9.0 F) |
| 2006 | -23.3 C (-9.9 F) |
| 2007 | -25.6 C (-14.1 F) |
| 2008 | -23.3 C (-9.9 F) |
| 2009 | -30.6 C (-23.1 F) |
| 2010 | -21.7 C (-7.1 F) |
| 2011 | -25.0 C (-13.0 F) |
| 2012 | -19.4 C (-2.9 F) |
| 2013 | -22.8 C (-9.0 F) |
| 2014 | -28.9 C (-20.0 F) |
| 2015 | -25.6 C (-14.1 F) |
| 2016 | -26.7 C (-16.1 F) |
| 2017 | -24.4 C (-11.9 F) |
| 2018 | -26.7 C (-16.1 F) |
| 2019 | -35.6 C (-32.1 F) |
| 2020 | -23.9 C (-11.0 F) |
| 2021 | -25.6 C (-14.1 F) |
| 2022 | -27.2 C (-17.0 F) |
| 2023 | -25.0 C (-13.0 F) |
| 2024 | -26.1 C (-15.0 F) |
| 2025 | -26.1 C (-15.0 F) |
| 2026 | -25.6 C (-14.1 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1948 | 24.9 mm (1.0 in) |
| 1949 | 55.4 mm (2.2 in) |
| 1950 | 82.6 mm (3.3 in) |
| 1951 | 72.9 mm (2.9 in) |
| 1975 | 17.3 mm (0.7 in) |
| 1976 | 72.9 mm (2.9 in) |
| 1977 | 41.4 mm (1.6 in) |
| 1978 | 60.2 mm (2.4 in) |
| 1979 | 33.8 mm (1.3 in) |
| 1980 | 41.4 mm (1.6 in) |
| 1981 | 77.5 mm (3.1 in) |
| 1982 | 23.6 mm (0.9 in) |
| 1983 | 42.4 mm (1.7 in) |
| 1984 | 39.6 mm (1.6 in) |
| 1985 | 121.2 mm (4.8 in) |
| 1986 | 89.2 mm (3.5 in) |
| 1987 | 116.3 mm (4.6 in) |
| 1988 | 49.5 mm (1.9 in) |
| 1989 | 12.7 mm (0.5 in) |
| 1990 | 41.7 mm (1.6 in) |
| 1992 | 40.9 mm (1.6 in) |
| 1993 | 74.2 mm (2.9 in) |
| 1994 | 48.8 mm (1.9 in) |
| 1995 | 46.7 mm (1.8 in) |
| 1996 | 55.9 mm (2.2 in) |
| 1997 | 52.3 mm (2.1 in) |
| 1998 | 77.2 mm (3.0 in) |
| 1999 | 101.9 mm (4.0 in) |
| 2000 | 69.9 mm (2.8 in) |
| 2001 | 52.3 mm (2.1 in) |
| 2002 | 96.5 mm (3.8 in) |
| 2003 | 43.2 mm (1.7 in) |
| 2004 | 72.1 mm (2.8 in) |
| 2005 | 33.3 mm (1.3 in) |
| 2006 | 52.6 mm (2.1 in) |
| 2007 | 106.4 mm (4.2 in) |
| 2008 | 64.8 mm (2.6 in) |
| 2009 | 49.3 mm (1.9 in) |
| 2010 | 88.1 mm (3.5 in) |
| 2011 | 101.9 mm (4.0 in) |
| 2012 | 65.0 mm (2.6 in) |
| 2013 | 111.8 mm (4.4 in) |
| 2014 | 58.7 mm (2.3 in) |
| 2015 | 54.6 mm (2.1 in) |
| 2016 | 58.4 mm (2.3 in) |
| 2017 | 59.4 mm (2.3 in) |
| 2018 | 58.4 mm (2.3 in) |
| 2019 | 115.6 mm (4.6 in) |
| 2020 | 56.4 mm (2.2 in) |
| 2021 | 99.1 mm (3.9 in) |
| 2022 | 69.3 mm (2.7 in) |
| 2023 | 48.3 mm (1.9 in) |
| 2024 | 95.5 mm (3.8 in) |
| 2025 | 65.8 mm (2.6 in) |
| 2026 | 56.4 mm (2.2 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1948 | 34.1 mm (1.3 in) |
| 1949 | 72.4 mm (2.9 in) |
| 1950 | 95.9 mm (3.8 in) |
| 1951 | 75.7 mm (3.0 in) |
| 1975 | 29.3 mm (1.2 in) |
| 1976 | 96.5 mm (3.8 in) |
| 1977 | 44.2 mm (1.7 in) |
| 1978 | 92.5 mm (3.6 in) |
| 1979 | 84.3 mm (3.3 in) |
| 1980 | 72.1 mm (2.8 in) |
| 1981 | 106.4 mm (4.2 in) |
| 1982 | 34.3 mm (1.4 in) |
| 1983 | 71.2 mm (2.8 in) |
| 1984 | 64.2 mm (2.5 in) |
| 1985 | 148.9 mm (5.9 in) |
| 1986 | 191.3 mm (7.5 in) |
| 1987 | 168.1 mm (6.6 in) |
| 1988 | 62.2 mm (2.4 in) |
| 1989 | 15.7 mm (0.6 in) |
| 1990 | 51.9 mm (2.0 in) |
| 1992 | 56.4 mm (2.2 in) |
| 1993 | 106.2 mm (4.2 in) |
| 1994 | 70.9 mm (2.8 in) |
| 1995 | 63.8 mm (2.5 in) |
| 1996 | 115.3 mm (4.5 in) |
| 1997 | 64.0 mm (2.5 in) |
| 1998 | 101.3 mm (4.0 in) |
| 1999 | 146.6 mm (5.8 in) |
| 2000 | 106.4 mm (4.2 in) |
| 2001 | 101.7 mm (4.0 in) |
| 2002 | 125.5 mm (4.9 in) |
| 2003 | 97.1 mm (3.8 in) |
| 2004 | 112.3 mm (4.4 in) |
| 2005 | 46.0 mm (1.8 in) |
| 2006 | 66.5 mm (2.6 in) |
| 2007 | 182.9 mm (7.2 in) |
| 2008 | 136.7 mm (5.4 in) |
| 2009 | 93.8 mm (3.7 in) |
| 2010 | 91.2 mm (3.6 in) |
| 2011 | 146.8 mm (5.8 in) |
| 2012 | 74.4 mm (2.9 in) |
| 2013 | 203.0 mm (8.0 in) |
| 2014 | 70.1 mm (2.8 in) |
| 2015 | 86.1 mm (3.4 in) |
| 2016 | 82.6 mm (3.3 in) |
| 2017 | 123.6 mm (4.9 in) |
| 2018 | 148.4 mm (5.8 in) |
| 2019 | 193.9 mm (7.6 in) |
| 2020 | 138.2 mm (5.4 in) |
| 2021 | 136.9 mm (5.4 in) |
| 2022 | 73.6 mm (2.9 in) |
| 2023 | 63.7 mm (2.5 in) |
| 2024 | 131.3 mm (5.2 in) |
| 2025 | 98.5 mm (3.9 in) |
| 2026 | 111.4 mm (4.4 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1948 | 26 days |
| 1949 | 13 days |
| 1950 | 30 days |
| 1951 | 16 days |
| 1975 | 14 days |
| 1976 | 26 days |
| 1977 | 18 days |
| 1978 | 17 days |
| 1979 | 33 days |
| 1980 | 13 days |
| 1981 | 31 days |
| 1982 | 17 days |
| 1983 | 13 days |
| 1984 | 16 days |
| 1985 | 14 days |
| 1986 | 26 days |
| 1987 | 29 days |
| 1988 | 35 days |
| 1989 | 16 days |
| 1990 | 11 days |
| 1992 | 13 days |
| 1993 | 18 days |
| 1994 | 20 days |
| 1995 | 34 days |
| 1996 | 29 days |
| 1997 | 16 days |
| 1998 | 24 days |
| 1999 | 33 days |
| 2000 | 16 days |
| 2001 | 34 days |
| 2002 | 24 days |
| 2003 | 30 days |
| 2004 | 20 days |
| 2005 | 22 days |
| 2006 | 18 days |
| 2007 | 18 days |
| 2008 | 14 days |
| 2009 | 26 days |
| 2010 | 29 days |
| 2011 | 14 days |
| 2012 | 18 days |
| 2013 | 19 days |
| 2014 | 22 days |
| 2015 | 20 days |
| 2016 | 12 days |
| 2017 | 34 days |
| 2018 | 20 days |
| 2019 | 26 days |
| 2020 | 15 days |
| 2021 | 22 days |
| 2022 | 19 days |
| 2023 | 22 days |
| 2024 | 29 days |
| 2025 | 13 days |
| 2026 | 43 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
27 years with a frostAcross 27 years with a frost, the median last spring frost at McHenry Stratton Lock/Dam falls on 28 April and the median first autumn frost on 13 October, which leaves a median of 167 days between them.
Fitted over all years, the growing season changes by +1.8 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1994 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 28 April | n/a | 28 April | n/a | +0.7 days per decade |
| First autumn frost | 13 October | n/a | 13 October | n/a | +2.5 days per decade |
| Growing days | 167 days | n/a | 167 days | n/a | +1.8 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
41 years, 1949 to 2025A day with at least 65.0 mm (2.6 in) of rain is expected about once in 2 years. A day with at least 151.3 mm (6.0 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 65.0 mm (2.6 in) | |
| 5 years | 88.1 mm (3.5 in) | |
| 10 years | 103.4 mm (4.1 in) | |
| 25 years | 122.7 mm (4.8 in) | |
| 50 years | 137.1 mm (5.4 in) | Longer than the 41 years of record |
| 100 years | 151.3 mm (6.0 in) | Longer than the 41 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, 41 years of values from 1949 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: 121.2 mm (4.8 in) in 1985; 116.3 mm (4.6 in) in 1987; 115.6 mm (4.6 in) in 2019.
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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-15).