Iowa City Muni AP Weather Records (USW00014937)
Record envelope, standing records and threshold days for Iowa City Muni AP (USW00014937), Iowa, United States, with 79 years of record.
Key Facts for Iowa City Muni AP
- Iowa City Muni AP (USW00014937) is a weather station in Iowa, United States at 41.64 latitude and -91.54 longitude, 199 m (652 ft) above sea level.
- The station reports from 1948 to 2026, 79 years of record.
- 1,464 records set at Iowa City Muni AP still stand.
- Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
- Iowa City Muni AP set a daily record high maximum temperature of 30.6 C (87.1 F) on 12 October 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: Iowa, United States, 41.64 latitude, -91.54 longitude.
- Elevation: 199 m (652 ft).
- Period of record: 1948 to 2026, 79 years.
- Eligible elements: tmax, tmin, prcp.
Daily Record Envelope and 2026
18 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) | -33.3 C (-27.9 F) | 15.0 C (59.0 F) | -25.0 C (-13.0 F) |
| Feb | 25.0 C (77.0 F) | -36.7 C (-34.1 F) | 21.1 C (70.0 F) | -16.1 C (3.0 F) |
| Mar | 32.8 C (91.0 F) | -26.7 C (-16.1 F) | 32.8 C (91.0 F) | -14.4 C (6.1 F) |
| Apr | 33.3 C (91.9 F) | -9.3 C (15.3 F) | 29.4 C (84.9 F) | -1.7 C (28.9 F) |
| May | 36.7 C (98.1 F) | -4.4 C (24.1 F) | 32.8 C (91.0 F) | 0.6 C (33.1 F) |
| Jun | 37.2 C (99.0 F) | 5.0 C (41.0 F) | 34.4 C (93.9 F) | 10.0 C (50.0 F) |
| Jul | 40.6 C (105.1 F) | 7.8 C (46.0 F) | 35.0 C (95.0 F) | 12.8 C (55.0 F) |
| Aug | 38.3 C (100.9 F) | 4.4 C (39.9 F) | 33.3 C (91.9 F) | 12.8 C (55.0 F) |
| Sep | 38.3 C (100.9 F) | -3.3 C (26.1 F) | 35.0 C (95.0 F) | 10.0 C (50.0 F) |
| Oct | 33.9 C (93.0 F) | -11.7 C (10.9 F) | 30.6 C (87.1 F) | 6.7 C (44.1 F) |
| Nov | 26.1 C (79.0 F) | -19.4 C (-2.9 F) | n/a | n/a |
| Dec | 23.9 C (75.0 F) | -28.3 C (-18.9 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1948 | 34 |
| 1949 | 33 |
| 1950 | 78 |
| 1951 | 67 |
| 1952 | 61 |
| 1953 | 11 |
| 1995 | 24 |
| 1996 | 55 |
| 1997 | 43 |
| 1998 | 35 |
| 1999 | 32 |
| 2000 | 54 |
| 2001 | 31 |
| 2002 | 32 |
| 2003 | 33 |
| 2004 | 54 |
| 2005 | 44 |
| 2006 | 57 |
| 2007 | 29 |
| 2008 | 23 |
| 2009 | 37 |
| 2010 | 22 |
| 2011 | 21 |
| 2012 | 60 |
| 2013 | 35 |
| 2014 | 54 |
| 2015 | 32 |
| 2016 | 17 |
| 2017 | 44 |
| 2018 | 38 |
| 2019 | 32 |
| 2020 | 27 |
| 2021 | 35 |
| 2022 | 35 |
| 2023 | 39 |
| 2024 | 40 |
| 2025 | 37 |
| 2026 | 29 |
Wettest Day of Each Month
Jun: 143.5 mm (5.6 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 36.1 mm (1.4 in) | 25 January 1950 |
| Feb | 42.2 mm (1.7 in) | 27 February 1948 |
| Mar | 42.7 mm (1.7 in) | 8 March 2009 |
| Apr | 101.1 mm (4.0 in) | 17 April 2013 |
| May | 118.6 mm (4.7 in) | 9 May 1996 |
| Jun | 143.5 mm (5.6 in) | 22 June 2007 |
| Jul | 76.7 mm (3.0 in) | 3 July 2004 |
| Aug | 84.8 mm (3.3 in) | 23 August 2002 |
| Sep | 70.1 mm (2.8 in) | 5 September 2018 |
| Oct | 90.4 mm (3.6 in) | 17 October 1998 |
| Nov | 66.5 mm (2.6 in) | 16 November 1952 |
| Dec | 40.4 mm (1.6 in) | 13 December 2015 |
Period of Record Coverage
1948 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1948 | 364 | 99% | Yes |
| 1949 | 364 | 100% | Yes |
| 1950 | 365 | 100% | Yes |
| 1951 | 365 | 100% | Yes |
| 1952 | 366 | 100% | Yes |
| 1953 | 136 | 37% | No |
| 1995 | 153 | 42% | No |
| 1996 | 354 | 97% | Yes |
| 1997 | 360 | 99% | Yes |
| 1998 | 359 | 98% | Yes |
| 1999 | 363 | 99% | Yes |
| 2000 | 361 | 99% | Yes |
| 2001 | 363 | 99% | Yes |
| 2002 | 358 | 98% | Yes |
| 2003 | 365 | 100% | Yes |
| 2004 | 363 | 99% | Yes |
| 2005 | 363 | 99% | Yes |
| 2006 | 362 | 99% | Yes |
| 2007 | 365 | 100% | Yes |
| 2008 | 366 | 100% | Yes |
| 2009 | 365 | 100% | Yes |
| 2010 | 364 | 100% | Yes |
| 2011 | 365 | 100% | Yes |
| 2012 | 365 | 100% | Yes |
| 2013 | 365 | 100% | Yes |
| 2014 | 365 | 100% | Yes |
| 2015 | 365 | 100% | Yes |
| 2016 | 366 | 100% | Yes |
| 2017 | 365 | 100% | Yes |
| 2018 | 365 | 100% | Yes |
| 2019 | 365 | 100% | Yes |
| 2020 | 366 | 100% | Yes |
| 2021 | 365 | 100% | Yes |
| 2022 | 365 | 100% | Yes |
| 2023 | 365 | 100% | Yes |
| 2024 | 366 | 100% | Yes |
| 2025 | 355 | 97% | Yes |
| 2026 | 284 | 78% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 12 October 2026 | Iowa City Muni AP, US | daily high max (Provisional) | 30.6 C (87.1 F) | 1.2 C (2.2 F) | 31 years | 17 of 100 (Routine) |
| 12 October 2026 | Iowa City Muni AP, US | daily high min (Provisional) | 17.2 C (63.0 F) | 1.1 C (2.0 F) | 28 years | 17 of 100 (Routine) |
| 10 October 2026 | Iowa City Muni AP, US | daily high max (Provisional) | 29.4 C (84.9 F) | 1.6 C (2.9 F) | 16 years | 13 of 100 (Routine) |
| 30 September 2026 | Iowa City Muni AP, US | daily rain (Provisional) | 28.4 mm (1.1 in) | 16.2 mm (0.6 in) | 19 years | 25 of 100 (Routine) |
| 20 September 2026 | Iowa City Muni AP, US | daily rain (Provisional) | 41.4 mm (1.6 in) | 0.8 mm (0.03 in) | 77 years | 30 of 100 (Routine) |
| 19 September 2026 | Iowa City Muni AP, US | daily rain (Provisional) | 53.1 mm (2.1 in) | 32.3 mm (1.3 in) | 8 years | 36 of 100 (Notable) |
| 15 September 2026 | Iowa City Muni AP, US | daily rain (Provisional) | 37.1 mm (1.5 in) | 8.9 mm (0.35 in) | 21 years | 20 of 100 (Routine) |
| 8 September 2026 | Iowa City Muni AP, US | daily rain (Provisional) | 48.8 mm (1.9 in) | 9.4 mm (0.37 in) | 5 years | 16 of 100 (Routine) |
| 8 September 2026 | Iowa City Muni AP, US | daily high max (Tie, Provisional) | 32.2 C (90.0 F) | tie | 24 years | 3 of 100 (Routine) |
| 5 September 2026 | Iowa City Muni AP, US | daily high max (Provisional) | 34.4 C (93.9 F) | 0.5 C (0.9 F) | 12 years | 11 of 100 (Routine) |
| 5 September 2026 | Iowa City Muni AP, US | daily high min (Provisional) | 23.3 C (73.9 F) | 0.5 C (0.9 F) | 3 years | 8 of 100 (Routine) |
| 4 September 2026 | Iowa City Muni AP, US | daily high min (Provisional) | 22.2 C (72.0 F) | 0.5 C (0.9 F) | 13 years | 12 of 100 (Routine) |
| 3 September 2026 | Iowa City Muni AP, US | daily high min (Provisional) | 22.8 C (73.0 F) | 1.7 C (3.1 F) | 25 years | 17 of 100 (Routine) |
| 1 September 2026 | Iowa City Muni AP, US | daily high min (Provisional) | 22.8 C (73.0 F) | 1.1 C (2.0 F) | 25 years | 16 of 100 (Routine) |
| 14 August 2026 | Iowa City Muni AP, US | daily rain | 19.0 mm (0.7 in) | 8.1 mm (0.32 in) | 1 year | 13 of 100 (Routine) |
| 12 August 2026 | Iowa City Muni AP, US | daily rain | 32.3 mm (1.3 in) | 16.6 mm (0.7 in) | 27 years | 28 of 100 (Routine) |
| 11 August 2026 | Iowa City Muni AP, US | daily high min | 23.3 C (73.9 F) | 0.5 C (0.9 F) | 9 years | 10 of 100 (Routine) |
| 10 August 2026 | Iowa City Muni AP, US | daily high min | 22.8 C (73.0 F) | 0.6 C (1.1 F) | 20 years | 14 of 100 (Routine) |
| 1 August 2026 | Iowa City Muni AP, US | daily rain | 5.6 mm (0.22 in) | 4.6 mm (0.18 in) | 31 years | 19 of 100 (Routine) |
| 31 July 2026 | Iowa City Muni AP, US | daily rain | 37.1 mm (1.5 in) | 18.1 mm (0.7 in) | 1 year | 19 of 100 (Routine) |
Climate Trend
35 complete years, 1948 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1948 | 9.3 C | -0.81 C |
| 1949 | 9.6 C | -0.52 C |
| 1950 | 8.1 C | -2.04 C |
| 1951 | 7.8 C | -2.30 C |
| 1952 | 9.6 C | -0.47 C |
| 1996 | 8.1 C | -2.03 C |
| 1997 | 8.9 C | -1.16 C |
| 1998 | 11.2 C | +1.10 C |
| 1999 | 10.4 C | +0.30 C |
| 2000 | 9.7 C | -0.43 C |
| 2001 | 10.1 C | +0.03 C |
| 2002 | 10.0 C | -0.12 C |
| 2003 | 9.5 C | -0.64 C |
| 2004 | 10.1 C | +0.05 C |
| 2005 | 11.4 C | +1.32 C |
| 2006 | 11.3 C | +1.25 C |
| 2007 | 10.3 C | +0.18 C |
| 2008 | 8.7 C | -1.41 C |
| 2009 | 9.2 C | -0.93 C |
| 2010 | 10.2 C | +0.14 C |
| 2011 | 10.2 C | +0.10 C |
| 2012 | 12.0 C | +1.88 C |
| 2013 | 9.3 C | -0.76 C |
| 2014 | 8.2 C | -1.93 C |
| 2015 | 10.4 C | +0.27 C |
| 2016 | 11.5 C | +1.45 C |
| 2017 | 11.6 C | +1.48 C |
| 2018 | 10.1 C | +0.05 C |
| 2019 | 9.9 C | -0.21 C |
| 2020 | 10.8 C | +0.67 C |
| 2021 | 11.1 C | +1.00 C |
| 2022 | 10.0 C | -0.12 C |
| 2023 | 11.6 C | +1.55 C |
| 2024 | 12.1 C | +2.04 C |
| 2025 | 11.1 C | +1.04 C |
The annual mean temperature here has risen by 0.3 C (0.1 to 0.4) per decade over 1948 to 2025. In Fahrenheit: 0.5 F (0.2 to 0.8) per decade. The slope is a straight line fitted to 35 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.3 C (0.1 to 0.4) per decade | 0.5 F (0.2 to 0.8) per decade | 1948 to 2025 | 35 | Rise |
| Mean daily maximum | 0.16 C (-0.01 to 0.34) per decade | 0.29 F (-0.02 to 0.61) per decade | 1948 to 2025 | 35 | Not clearly different from zero |
| Mean daily minimum | 0.4 C (0.2 to 0.5) per decade | 0.7 F (0.4 to 0.9) per decade | 1948 to 2025 | 35 | Rise |
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) | 40.6 C (105.1 F) | 2012 | 35.6 C (96.1 F) | 38 |
| Coldest night (TNn) | -36.7 C (-34.1 F) | 1996 | -25.0 C (-13.0 F) | 38 |
| Wettest day (Rx1day) | 143.5 mm (5.6 in) | 2007 | 58.8 mm (2.3 in) | 38 |
| Wettest five days (Rx5day) | 154.6 mm (6.1 in) | 2007 | 89.6 mm (3.5 in) | 38 |
| Longest dry spell (CDD) | 62 days | 1952 | 23 days | 38 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1948 | 37.8 C (100.0 F) |
| 1949 | 36.1 C (97.0 F) |
| 1950 | 33.9 C (93.0 F) |
| 1951 | 35.6 C (96.1 F) |
| 1952 | 36.1 C (97.0 F) |
| 1953 | 28.9 C (84.0 F) |
| 1995 | 35.0 C (95.0 F) |
| 1996 | 35.6 C (96.1 F) |
| 1997 | 36.1 C (97.0 F) |
| 1998 | 35.0 C (95.0 F) |
| 1999 | 37.8 C (100.0 F) |
| 2000 | 36.7 C (98.1 F) |
| 2001 | 36.1 C (97.0 F) |
| 2002 | 35.0 C (95.0 F) |
| 2003 | 38.3 C (100.9 F) |
| 2004 | 32.2 C (90.0 F) |
| 2005 | 39.4 C (102.9 F) |
| 2006 | 36.7 C (98.1 F) |
| 2007 | 33.9 C (93.0 F) |
| 2008 | 33.9 C (93.0 F) |
| 2009 | 34.4 C (93.9 F) |
| 2010 | 34.4 C (93.9 F) |
| 2011 | 36.7 C (98.1 F) |
| 2012 | 40.6 C (105.1 F) |
| 2013 | 38.3 C (100.9 F) |
| 2014 | 33.3 C (91.9 F) |
| 2015 | 35.0 C (95.0 F) |
| 2016 | 34.4 C (93.9 F) |
| 2017 | 35.0 C (95.0 F) |
| 2018 | 36.7 C (98.1 F) |
| 2019 | 36.7 C (98.1 F) |
| 2020 | 35.6 C (96.1 F) |
| 2021 | 35.6 C (96.1 F) |
| 2022 | 36.7 C (98.1 F) |
| 2023 | 37.8 C (100.0 F) |
| 2024 | 35.6 C (96.1 F) |
| 2025 | 35.6 C (96.1 F) |
| 2026 | 35.0 C (95.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1948 | -26.7 C (-16.1 F) |
| 1949 | -29.4 C (-20.9 F) |
| 1950 | -26.7 C (-16.1 F) |
| 1951 | -29.4 C (-20.9 F) |
| 1952 | -22.2 C (-8.0 F) |
| 1953 | -26.7 C (-16.1 F) |
| 1995 | -20.6 C (-5.1 F) |
| 1996 | -36.7 C (-34.1 F) |
| 1997 | -25.0 C (-13.0 F) |
| 1998 | -22.2 C (-8.0 F) |
| 1999 | -30.6 C (-23.1 F) |
| 2000 | -26.7 C (-16.1 F) |
| 2001 | -23.9 C (-11.0 F) |
| 2002 | -21.7 C (-7.1 F) |
| 2003 | -21.7 C (-7.1 F) |
| 2004 | -22.8 C (-9.0 F) |
| 2005 | -25.0 C (-13.0 F) |
| 2006 | -22.1 C (-7.8 F) |
| 2007 | -24.3 C (-11.7 F) |
| 2008 | -24.9 C (-12.8 F) |
| 2009 | -31.6 C (-24.9 F) |
| 2010 | -26.0 C (-14.8 F) |
| 2011 | -28.2 C (-18.8 F) |
| 2012 | -18.2 C (-0.8 F) |
| 2013 | -26.6 C (-15.9 F) |
| 2014 | -28.2 C (-18.8 F) |
| 2015 | -25.5 C (-13.9 F) |
| 2016 | -24.3 C (-11.7 F) |
| 2017 | -24.9 C (-12.8 F) |
| 2018 | -28.8 C (-19.8 F) |
| 2019 | -33.2 C (-27.8 F) |
| 2020 | -22.1 C (-7.8 F) |
| 2021 | -25.5 C (-13.9 F) |
| 2022 | -22.7 C (-8.9 F) |
| 2023 | -19.9 C (-3.8 F) |
| 2024 | -28.8 C (-19.8 F) |
| 2025 | -24.9 C (-12.8 F) |
| 2026 | -25.0 C (-13.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1948 | 75.7 mm (3.0 in) |
| 1949 | 51.8 mm (2.0 in) |
| 1950 | 68.3 mm (2.7 in) |
| 1951 | 40.4 mm (1.6 in) |
| 1952 | 66.5 mm (2.6 in) |
| 1953 | 38.4 mm (1.5 in) |
| 1995 | 33.8 mm (1.3 in) |
| 1996 | 118.6 mm (4.7 in) |
| 1997 | 47.8 mm (1.9 in) |
| 1998 | 90.4 mm (3.6 in) |
| 1999 | 69.1 mm (2.7 in) |
| 2000 | 79.2 mm (3.1 in) |
| 2001 | 46.0 mm (1.8 in) |
| 2002 | 84.8 mm (3.3 in) |
| 2003 | 59.9 mm (2.4 in) |
| 2004 | 76.7 mm (3.0 in) |
| 2005 | 32.5 mm (1.3 in) |
| 2006 | 39.6 mm (1.6 in) |
| 2007 | 143.5 mm (5.6 in) |
| 2008 | 54.6 mm (2.1 in) |
| 2009 | 55.9 mm (2.2 in) |
| 2010 | 39.1 mm (1.5 in) |
| 2011 | 63.0 mm (2.5 in) |
| 2012 | 54.9 mm (2.2 in) |
| 2013 | 101.1 mm (4.0 in) |
| 2014 | 94.7 mm (3.7 in) |
| 2015 | 42.9 mm (1.7 in) |
| 2016 | 72.6 mm (2.9 in) |
| 2017 | 56.6 mm (2.2 in) |
| 2018 | 84.1 mm (3.3 in) |
| 2019 | 57.7 mm (2.3 in) |
| 2020 | 88.1 mm (3.5 in) |
| 2021 | 59.9 mm (2.4 in) |
| 2022 | 54.4 mm (2.1 in) |
| 2023 | 40.9 mm (1.6 in) |
| 2024 | 64.8 mm (2.6 in) |
| 2025 | 43.9 mm (1.7 in) |
| 2026 | 53.1 mm (2.1 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1948 | 114.1 mm (4.5 in) |
| 1949 | 115.1 mm (4.5 in) |
| 1950 | 83.3 mm (3.3 in) |
| 1951 | 64.6 mm (2.5 in) |
| 1952 | 119.3 mm (4.7 in) |
| 1953 | 53.4 mm (2.1 in) |
| 1995 | 50.1 mm (2.0 in) |
| 1996 | 138.2 mm (5.4 in) |
| 1997 | 63.3 mm (2.5 in) |
| 1998 | 95.5 mm (3.8 in) |
| 1999 | 110.4 mm (4.3 in) |
| 2000 | 85.0 mm (3.3 in) |
| 2001 | 64.0 mm (2.5 in) |
| 2002 | 105.2 mm (4.1 in) |
| 2003 | 67.1 mm (2.6 in) |
| 2004 | 107.5 mm (4.2 in) |
| 2005 | 42.1 mm (1.7 in) |
| 2006 | 52.1 mm (2.1 in) |
| 2007 | 154.6 mm (6.1 in) |
| 2008 | 80.8 mm (3.2 in) |
| 2009 | 96.0 mm (3.8 in) |
| 2010 | 71.8 mm (2.8 in) |
| 2011 | 83.3 mm (3.3 in) |
| 2012 | 73.2 mm (2.9 in) |
| 2013 | 133.1 mm (5.2 in) |
| 2014 | 142.6 mm (5.6 in) |
| 2015 | 72.2 mm (2.8 in) |
| 2016 | 90.1 mm (3.5 in) |
| 2017 | 112.2 mm (4.4 in) |
| 2018 | 148.8 mm (5.9 in) |
| 2019 | 97.1 mm (3.8 in) |
| 2020 | 113.8 mm (4.5 in) |
| 2021 | 89.1 mm (3.5 in) |
| 2022 | 62.5 mm (2.5 in) |
| 2023 | 57.4 mm (2.3 in) |
| 2024 | 71.7 mm (2.8 in) |
| 2025 | 90.9 mm (3.6 in) |
| 2026 | 147.3 mm (5.8 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1948 | 31 days |
| 1949 | 23 days |
| 1950 | 30 days |
| 1951 | 16 days |
| 1952 | 62 days |
| 1953 | 10 days |
| 1995 | 21 days |
| 1996 | 19 days |
| 1997 | 37 days |
| 1998 | 23 days |
| 1999 | 36 days |
| 2000 | 19 days |
| 2001 | 13 days |
| 2002 | 32 days |
| 2003 | 27 days |
| 2004 | 21 days |
| 2005 | 17 days |
| 2006 | 20 days |
| 2007 | 30 days |
| 2008 | 15 days |
| 2009 | 26 days |
| 2010 | 27 days |
| 2011 | 21 days |
| 2012 | 28 days |
| 2013 | 23 days |
| 2014 | 19 days |
| 2015 | 23 days |
| 2016 | 22 days |
| 2017 | 22 days |
| 2018 | 17 days |
| 2019 | 16 days |
| 2020 | 21 days |
| 2021 | 21 days |
| 2022 | 26 days |
| 2023 | 29 days |
| 2024 | 34 days |
| 2025 | 19 days |
| 2026 | 33 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
35 years with a frostAcross 35 years with a frost, the median last spring frost at Iowa City Muni AP falls on 23 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 +2.5 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1996 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 23 April | n/a | 24 April | n/a | +0.4 days per decade |
| First autumn frost | 15 October | n/a | 16 October | n/a | +2.9 days per decade |
| Growing days | 172 days | n/a | 175 days | n/a | +2.5 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
35 years, 1948 to 2025A day with at least 61.3 mm (2.4 in) of rain is expected about once in 2 years. A day with at least 150.7 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 | 61.3 mm (2.4 in) | |
| 5 years | 82.6 mm (3.3 in) | |
| 10 years | 97.7 mm (3.8 in) | |
| 25 years | 118.0 mm (4.6 in) | |
| 50 years | 134.0 mm (5.3 in) | Longer than the 35 years of record |
| 100 years | 150.7 mm (5.9 in) | Longer than the 35 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, 35 years of values from 1948 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: 143.5 mm (5.6 in) in 2007; 118.6 mm (4.7 in) in 1996; 101.1 mm (4.0 in) in 2013.
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).