Chicago Botanic Garden Weather Records (USC00111497)
Record envelope, standing records and threshold days for Chicago Botanic Garden (USC00111497), Illinois, United States, with 39 years of record.
Key Facts for Chicago Botanic Garden
- Chicago Botanic Garden (USC00111497) is a weather station in Illinois, United States at 42.14 latitude and -87.79 longitude, 192 m (630 ft) above sea level.
- The station reports from 1981 to 2019, 39 years of record.
- 1,464 records set at Chicago Botanic Garden still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Chicago Botanic Garden set a daily record precipitation of 40.1 mm (1.6 in) on 5 June 2019.
About the Station
- Location: Illinois, United States, 42.14 latitude, -87.79 longitude.
- Elevation: 192 m (630 ft).
- Period of record: 1981 to 2019, 39 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
0 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 18.3 C (64.9 F) | -32.8 C (-27.0 F) | n/a | n/a |
| Feb | 23.3 C (73.9 F) | -28.9 C (-20.0 F) | n/a | n/a |
| Mar | 30.0 C (86.0 F) | -20.6 C (-5.1 F) | n/a | n/a |
| Apr | 32.2 C (90.0 F) | -12.2 C (10.0 F) | n/a | n/a |
| May | 35.0 C (95.0 F) | -2.2 C (28.0 F) | n/a | n/a |
| Jun | 38.9 C (102.0 F) | 2.8 C (37.0 F) | n/a | n/a |
| Jul | 40.6 C (105.1 F) | 7.2 C (45.0 F) | n/a | n/a |
| Aug | 38.3 C (100.9 F) | 5.6 C (42.1 F) | n/a | n/a |
| Sep | 36.1 C (97.0 F) | -1.1 C (30.0 F) | n/a | n/a |
| Oct | 31.7 C (89.1 F) | -4.4 C (24.1 F) | n/a | n/a |
| Nov | 25.0 C (77.0 F) | -14.4 C (6.1 F) | n/a | n/a |
| Dec | 21.1 C (70.0 F) | -28.9 C (-20.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1982 | 63 |
| 1983 | 54 |
| 1984 | 47 |
| 1985 | 46 |
| 1986 | 39 |
| 1987 | 38 |
| 1988 | 50 |
| 1989 | 55 |
| 1990 | 50 |
| 1991 | 62 |
| 1992 | 55 |
| 1993 | 33 |
| 1994 | 44 |
| 1995 | 43 |
| 1996 | 42 |
| 1997 | 38 |
| 1998 | 30 |
| 1999 | 30 |
| 2000 | 42 |
| 2001 | 27 |
| 2002 | 47 |
| 2003 | 21 |
| 2004 | 24 |
| 2005 | 35 |
| 2006 | 32 |
| 2007 | 33 |
| 2008 | 25 |
| 2009 | 22 |
| 2010 | 26 |
| 2011 | 27 |
| 2012 | 50 |
| 2013 | 23 |
| 2014 | 62 |
| 2015 | 38 |
| 2016 | 18 |
| 2017 | 48 |
| 2018 | 32 |
| 2019 | 13 |
All-Time Record Progression
1 new records| Date | Kind | Detail |
|---|---|---|
| 2014-02-18 | Record snow depth | Record snow depth 48.3 cm (19.0 in) |
Wettest Day of Each Month
Aug: 140.7 mm (5.5 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 54.4 mm (2.1 in) | 1 January 1985 |
| Feb | 81.3 mm (3.2 in) | 21 February 1997 |
| Mar | 50.8 mm (2.0 in) | 4 March 1985 |
| Apr | 69.1 mm (2.7 in) | 18 April 2013 |
| May | 83.8 mm (3.3 in) | 13 May 2014 |
| Jun | 114.3 mm (4.5 in) | 24 June 1994 |
| Jul | 101.9 mm (4.0 in) | 23 July 2011 |
| Aug | 140.7 mm (5.5 in) | 14 August 1987 |
| Sep | 85.1 mm (3.4 in) | 14 September 2008 |
| Oct | 91.2 mm (3.6 in) | 3 October 2006 |
| Nov | 59.2 mm (2.3 in) | 1 November 1994 |
| Dec | 70.9 mm (2.8 in) | 3 December 1982 |
Period of Record Coverage
1981 to 2019| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1981 | 31 | 8% | No |
| 1982 | 364 | 100% | Yes |
| 1983 | 363 | 99% | Yes |
| 1984 | 334 | 91% | Yes |
| 1985 | 364 | 100% | Yes |
| 1986 | 334 | 92% | Yes |
| 1987 | 363 | 99% | Yes |
| 1988 | 335 | 92% | Yes |
| 1989 | 365 | 100% | Yes |
| 1990 | 335 | 92% | Yes |
| 1991 | 361 | 99% | Yes |
| 1992 | 365 | 100% | Yes |
| 1993 | 364 | 100% | Yes |
| 1994 | 363 | 99% | Yes |
| 1995 | 361 | 99% | Yes |
| 1996 | 365 | 100% | Yes |
| 1997 | 363 | 99% | Yes |
| 1998 | 365 | 100% | Yes |
| 1999 | 362 | 99% | Yes |
| 2000 | 366 | 100% | Yes |
| 2001 | 364 | 100% | Yes |
| 2002 | 361 | 99% | Yes |
| 2003 | 364 | 100% | Yes |
| 2004 | 365 | 100% | Yes |
| 2005 | 364 | 100% | Yes |
| 2006 | 365 | 100% | Yes |
| 2007 | 364 | 100% | Yes |
| 2008 | 365 | 100% | Yes |
| 2009 | 364 | 100% | Yes |
| 2010 | 362 | 99% | Yes |
| 2011 | 363 | 99% | Yes |
| 2012 | 364 | 99% | Yes |
| 2013 | 365 | 100% | Yes |
| 2014 | 365 | 100% | Yes |
| 2015 | 365 | 100% | Yes |
| 2016 | 365 | 100% | Yes |
| 2017 | 362 | 99% | Yes |
| 2018 | 365 | 100% | Yes |
| 2019 | 154 | 42% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 5 June 2019 | Chicago Botanic Garden, US | daily rain | 40.1 mm (1.6 in) | 17.5 mm (0.7 in) | 32 years | 24 of 100 (Routine) |
| 8 May 2019 | Chicago Botanic Garden, US | daily low max (Tie) | 10.0 C (50.0 F) | tie | 24 years | 2 of 100 (Routine) |
| 29 April 2019 | Chicago Botanic Garden, US | daily rain | 23.6 mm (0.9 in) | 7.9 mm (0.31 in) | 25 years | 18 of 100 (Routine) |
| 28 April 2019 | Chicago Botanic Garden, US | daily snowfall | 6.4 cm (2.5 in) | 6.4 cm (2.5 in) | 36 years | 26 of 100 (Routine) |
| 28 April 2019 | Chicago Botanic Garden, US | daily snow depth | 7.6 cm (3.0 in) | 7.6 cm (3.0 in) | 36 years | 20 of 100 (Routine) |
| 15 April 2019 | Chicago Botanic Garden, US | daily snowfall | 10.2 cm (4.0 in) | 5.1 cm (2.0 in) | 4 years | 14 of 100 (Routine) |
| 15 April 2019 | Chicago Botanic Garden, US | daily snow depth | 10.2 cm (4.0 in) | 5.1 cm (2.0 in) | 4 years | 9 of 100 (Routine) |
| 15 April 2019 | Chicago Botanic Garden, US | daily low max | 2.2 C (36.0 F) | 1.1 C (2.0 F) | 0 years | 4 of 100 (Routine) |
| 11 April 2019 | Chicago Botanic Garden, US | daily low max (Tie) | 3.9 C (39.0 F) | tie | 29 years | 2 of 100 (Routine) |
| 31 March 2019 | Chicago Botanic Garden, US | daily snowfall | 0.3 cm (0.1 in) | 0.3 cm (0.1 in) | 36 years | 14 of 100 (Routine) |
| 10 March 2019 | Chicago Botanic Garden, US | daily rain | 14.7 mm (0.6 in) | 2.0 mm (0.08 in) | 26 years | 13 of 100 (Routine) |
| 5 March 2019 | Chicago Botanic Garden, US | monthly low max | -10.0 C (14.0 F) | 1.1 C (2.0 F) | 22 years | 20 of 100 (Routine) |
| 5 March 2019 | Chicago Botanic Garden, US | daily low min | -18.3 C (-0.9 F) | 2.7 C (4.9 F) | 16 years | 12 of 100 (Routine) |
| 26 February 2019 | Chicago Botanic Garden, US | daily low max (Tie) | -7.2 C (19.0 F) | tie | 16 years | 1 of 100 (Routine) |
| 18 February 2019 | Chicago Botanic Garden, US | daily rain | 12.7 mm (0.5 in) | 2.0 mm (0.08 in) | 11 years | 8 of 100 (Routine) |
| 18 February 2019 | Chicago Botanic Garden, US | daily snowfall | 12.7 cm (5.0 in) | 2.5 cm (1.0 in) | 4 years | 8 of 100 (Routine) |
| 12 February 2019 | Chicago Botanic Garden, US | daily rain | 16.3 mm (0.6 in) | 0.3 mm (0.01 in) | 9 years | 5 of 100 (Routine) |
| 6 February 2019 | Chicago Botanic Garden, US | daily rain | 15.0 mm (0.6 in) | 1.0 mm (0.04 in) | 11 years | 7 of 100 (Routine) |
| 4 February 2019 | Chicago Botanic Garden, US | daily high min | 6.1 C (43.0 F) | 2.2 C (4.0 F) | 28 years | 14 of 100 (Routine) |
| 1 February 2019 | Chicago Botanic Garden, US | monthly low min (Tie) | -28.9 C (-20.0 F) | tie | 22 years | 4 of 100 (Routine) |
Climate Trend
33 complete years, 1982 to 2018| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1982 | 8.2 C | -1.46 C |
| 1983 | 9.3 C | -0.38 C |
| 1985 | 8.5 C | -1.12 C |
| 1987 | 10.6 C | +0.91 C |
| 1989 | 8.2 C | -1.42 C |
| 1991 | 10.2 C | +0.57 C |
| 1992 | 8.7 C | -0.94 C |
| 1993 | 8.8 C | -0.84 C |
| 1994 | 9.5 C | -0.19 C |
| 1995 | 9.3 C | -0.33 C |
| 1996 | 8.2 C | -1.50 C |
| 1997 | 8.9 C | -0.73 C |
| 1998 | 11.5 C | +1.89 C |
| 1999 | 10.2 C | +0.57 C |
| 2000 | 9.9 C | +0.26 C |
| 2001 | 10.4 C | +0.74 C |
| 2002 | 10.2 C | +0.58 C |
| 2003 | 9.0 C | -0.67 C |
| 2004 | 9.7 C | +0.06 C |
| 2005 | 10.4 C | +0.79 C |
| 2006 | 10.6 C | +0.90 C |
| 2007 | 10.1 C | +0.44 C |
| 2008 | 9.0 C | -0.67 C |
| 2009 | 8.9 C | -0.76 C |
| 2010 | 10.6 C | +0.92 C |
| 2011 | 10.2 C | +0.53 C |
| 2012 | 11.9 C | +2.21 C |
| 2013 | 9.0 C | -0.69 C |
| 2014 | 7.9 C | -1.79 C |
| 2015 | 9.8 C | +0.13 C |
| 2016 | 10.9 C | +1.29 C |
| 2017 | 10.5 C | +0.86 C |
| 2018 | 9.6 C | -0.10 C |
The fitted trend in annual mean temperature here over 1982 to 2018 is 0.32 C (0.00 to 0.65) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.58 F (-0.01 to 1.18) per decade. The slope is a straight line fitted to 33 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.32 C (0.00 to 0.65) per decade | 0.58 F (-0.01 to 1.18) per decade | 1982 to 2018 | 33 | Not clearly different from zero |
| Mean daily maximum | 0.4 C (0.1 to 0.8) per decade | 0.8 F (0.1 to 1.4) per decade | 1982 to 2018 | 33 | Rise |
| Mean daily minimum | 0.2 C (-0.1 to 0.5) per decade | 0.4 F (-0.2 to 1.0) per decade | 1982 to 2018 | 33 | 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
1981 to 2019| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 40.6 C (105.1 F) | 1995 | 36.1 C (97.0 F) | 39 |
| Coldest night (TNn) | -32.8 C (-27.0 F) | 1982 | -21.7 C (-7.1 F) | 39 |
| Wettest day (Rx1day) | 140.7 mm (5.5 in) | 1987 | 66.0 mm (2.6 in) | 39 |
| Wettest five days (Rx5day) | 200.4 mm (7.9 in) | 1987 | 102.8 mm (4.0 in) | 39 |
| Longest dry spell (CDD) | 34 days | 1995 | 19 days | 39 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1981 | 8.9 C (48.0 F) |
| 1982 | 33.9 C (93.0 F) |
| 1983 | 36.7 C (98.1 F) |
| 1984 | 35.6 C (96.1 F) |
| 1985 | 35.0 C (95.0 F) |
| 1986 | 35.0 C (95.0 F) |
| 1987 | 36.1 C (97.0 F) |
| 1988 | 39.4 C (102.9 F) |
| 1989 | 37.8 C (100.0 F) |
| 1990 | 36.7 C (98.1 F) |
| 1991 | 38.3 C (100.9 F) |
| 1992 | 32.2 C (90.0 F) |
| 1993 | 35.0 C (95.0 F) |
| 1994 | 36.7 C (98.1 F) |
| 1995 | 40.6 C (105.1 F) |
| 1996 | 35.0 C (95.0 F) |
| 1997 | 36.1 C (97.0 F) |
| 1998 | 37.2 C (99.0 F) |
| 1999 | 40.0 C (104.0 F) |
| 2000 | 34.4 C (93.9 F) |
| 2001 | 36.1 C (97.0 F) |
| 2002 | 38.3 C (100.9 F) |
| 2003 | 36.7 C (98.1 F) |
| 2004 | 33.9 C (93.0 F) |
| 2005 | 39.4 C (102.9 F) |
| 2006 | 37.8 C (100.0 F) |
| 2007 | 35.6 C (96.1 F) |
| 2008 | 33.9 C (93.0 F) |
| 2009 | 35.6 C (96.1 F) |
| 2010 | 36.1 C (97.0 F) |
| 2011 | 38.9 C (102.0 F) |
| 2012 | 40.6 C (105.1 F) |
| 2013 | 35.6 C (96.1 F) |
| 2014 | 32.8 C (91.0 F) |
| 2015 | 34.4 C (93.9 F) |
| 2016 | 35.0 C (95.0 F) |
| 2017 | 35.0 C (95.0 F) |
| 2018 | 36.1 C (97.0 F) |
| 2019 | 29.4 C (84.9 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1981 | -17.2 C (1.0 F) |
| 1982 | -32.8 C (-27.0 F) |
| 1983 | -28.9 C (-20.0 F) |
| 1984 | -18.3 C (-0.9 F) |
| 1985 | -32.2 C (-26.0 F) |
| 1986 | -21.1 C (-6.0 F) |
| 1987 | -20.6 C (-5.1 F) |
| 1988 | -25.0 C (-13.0 F) |
| 1989 | -26.1 C (-15.0 F) |
| 1990 | -21.1 C (-6.0 F) |
| 1991 | -18.9 C (-2.0 F) |
| 1992 | -22.2 C (-8.0 F) |
| 1993 | -20.6 C (-5.1 F) |
| 1994 | -30.0 C (-22.0 F) |
| 1995 | -20.6 C (-5.1 F) |
| 1996 | -28.9 C (-20.0 F) |
| 1997 | -22.8 C (-9.0 F) |
| 1998 | -18.3 C (-0.9 F) |
| 1999 | -26.7 C (-16.1 F) |
| 2000 | -22.8 C (-9.0 F) |
| 2001 | -20.0 C (-4.0 F) |
| 2002 | -20.6 C (-5.1 F) |
| 2003 | -21.1 C (-6.0 F) |
| 2004 | -22.8 C (-9.0 F) |
| 2005 | -18.9 C (-2.0 F) |
| 2006 | -22.2 C (-8.0 F) |
| 2007 | -23.3 C (-9.9 F) |
| 2008 | -21.1 C (-6.0 F) |
| 2009 | -27.2 C (-17.0 F) |
| 2010 | -17.8 C (0.0 F) |
| 2011 | -21.7 C (-7.1 F) |
| 2012 | -16.7 C (1.9 F) |
| 2013 | -19.4 C (-2.9 F) |
| 2014 | -26.7 C (-16.1 F) |
| 2015 | -25.0 C (-13.0 F) |
| 2016 | -20.0 C (-4.0 F) |
| 2017 | -20.6 C (-5.1 F) |
| 2018 | -22.2 C (-8.0 F) |
| 2019 | -30.6 C (-23.1 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1981 | 22.9 mm (0.9 in) |
| 1982 | 70.9 mm (2.8 in) |
| 1983 | 60.7 mm (2.4 in) |
| 1984 | 41.9 mm (1.6 in) |
| 1985 | 54.4 mm (2.1 in) |
| 1986 | 64.0 mm (2.5 in) |
| 1987 | 140.7 mm (5.5 in) |
| 1988 | 48.3 mm (1.9 in) |
| 1989 | 81.8 mm (3.2 in) |
| 1990 | 75.4 mm (3.0 in) |
| 1991 | 66.0 mm (2.6 in) |
| 1992 | 50.3 mm (2.0 in) |
| 1993 | 46.5 mm (1.8 in) |
| 1994 | 114.3 mm (4.5 in) |
| 1995 | 65.5 mm (2.6 in) |
| 1996 | 77.0 mm (3.0 in) |
| 1997 | 81.3 mm (3.2 in) |
| 1998 | 64.8 mm (2.6 in) |
| 1999 | 55.1 mm (2.2 in) |
| 2000 | 65.0 mm (2.6 in) |
| 2001 | 79.5 mm (3.1 in) |
| 2002 | 126.5 mm (5.0 in) |
| 2003 | 56.6 mm (2.2 in) |
| 2004 | 58.4 mm (2.3 in) |
| 2005 | 27.4 mm (1.1 in) |
| 2006 | 91.2 mm (3.6 in) |
| 2007 | 61.7 mm (2.4 in) |
| 2008 | 85.1 mm (3.4 in) |
| 2009 | 51.3 mm (2.0 in) |
| 2010 | 77.0 mm (3.0 in) |
| 2011 | 101.9 mm (4.0 in) |
| 2012 | 88.9 mm (3.5 in) |
| 2013 | 69.1 mm (2.7 in) |
| 2014 | 83.8 mm (3.3 in) |
| 2015 | 48.3 mm (1.9 in) |
| 2016 | 95.5 mm (3.8 in) |
| 2017 | 75.9 mm (3.0 in) |
| 2018 | 71.1 mm (2.8 in) |
| 2019 | 55.6 mm (2.2 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1981 | 38.1 mm (1.5 in) |
| 1982 | 104.7 mm (4.1 in) |
| 1983 | 102.8 mm (4.0 in) |
| 1984 | 78.9 mm (3.1 in) |
| 1985 | 78.0 mm (3.1 in) |
| 1986 | 118.0 mm (4.6 in) |
| 1987 | 200.4 mm (7.9 in) |
| 1988 | 49.6 mm (2.0 in) |
| 1989 | 96.8 mm (3.8 in) |
| 1990 | 189.7 mm (7.5 in) |
| 1991 | 85.6 mm (3.4 in) |
| 1992 | 72.7 mm (2.9 in) |
| 1993 | 67.1 mm (2.6 in) |
| 1994 | 162.3 mm (6.4 in) |
| 1995 | 75.9 mm (3.0 in) |
| 1996 | 112.8 mm (4.4 in) |
| 1997 | 103.1 mm (4.1 in) |
| 1998 | 79.9 mm (3.1 in) |
| 1999 | 88.7 mm (3.5 in) |
| 2000 | 90.9 mm (3.6 in) |
| 2001 | 121.7 mm (4.8 in) |
| 2002 | 137.7 mm (5.4 in) |
| 2003 | 99.8 mm (3.9 in) |
| 2004 | 130.3 mm (5.1 in) |
| 2005 | 40.4 mm (1.6 in) |
| 2006 | 122.9 mm (4.8 in) |
| 2007 | 134.6 mm (5.3 in) |
| 2008 | 193.6 mm (7.6 in) |
| 2009 | 112.6 mm (4.4 in) |
| 2010 | 96.3 mm (3.8 in) |
| 2011 | 131.9 mm (5.2 in) |
| 2012 | 95.7 mm (3.8 in) |
| 2013 | 90.4 mm (3.6 in) |
| 2014 | 128.6 mm (5.1 in) |
| 2015 | 80.3 mm (3.2 in) |
| 2016 | 117.9 mm (4.6 in) |
| 2017 | 155.7 mm (6.1 in) |
| 2018 | 86.1 mm (3.4 in) |
| 2019 | 110.4 mm (4.3 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1981 | 13 days |
| 1982 | 17 days |
| 1983 | 16 days |
| 1984 | 15 days |
| 1985 | 13 days |
| 1986 | 25 days |
| 1987 | 29 days |
| 1988 | 29 days |
| 1989 | 22 days |
| 1990 | 15 days |
| 1991 | 28 days |
| 1992 | 23 days |
| 1993 | 21 days |
| 1994 | 21 days |
| 1995 | 34 days |
| 1996 | 27 days |
| 1997 | 16 days |
| 1998 | 24 days |
| 1999 | 24 days |
| 2000 | 19 days |
| 2001 | 20 days |
| 2002 | 20 days |
| 2003 | 19 days |
| 2004 | 19 days |
| 2005 | 23 days |
| 2006 | 17 days |
| 2007 | 21 days |
| 2008 | 14 days |
| 2009 | 23 days |
| 2010 | 15 days |
| 2011 | 13 days |
| 2012 | 15 days |
| 2013 | 19 days |
| 2014 | 12 days |
| 2015 | 20 days |
| 2016 | 13 days |
| 2017 | 18 days |
| 2018 | 12 days |
| 2019 | 13 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
33 years with a frostAcross 33 years with a frost, the median last spring frost at Chicago Botanic Garden falls on 24 April and the median first autumn frost on 15 October, which leaves a median of 172 days between them.
Fitted over all years, the growing season changes by +6.0 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1987 to 2018) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 24 April | n/a | 25 April | n/a | -1.8 days per decade |
| First autumn frost | 15 October | n/a | 15 October | n/a | +4.2 days per decade |
| Growing days | 172 days | n/a | 172 days | n/a | +6.0 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
37 years, 1982 to 2018A day with at least 68.5 mm (2.7 in) of rain is expected about once in 2 years. A day with at least 144.7 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 | 68.5 mm (2.7 in) | |
| 5 years | 89.2 mm (3.5 in) | |
| 10 years | 102.8 mm (4.0 in) | |
| 25 years | 119.8 mm (4.7 in) | |
| 50 years | 132.4 mm (5.2 in) | Longer than the 37 years of record |
| 100 years | 144.7 mm (5.7 in) | Longer than the 37 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, 37 years of values from 1982 to 2018.
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: 140.7 mm (5.5 in) in 1987; 126.5 mm (5.0 in) in 2002; 114.3 mm (4.5 in) in 1994.
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 (2025-12-31).