March AFB Weather Records (USW00023119)
Record envelope, standing records and threshold days for March AFB (USW00023119), California, United States, with 78 years of record.
Key Facts for March AFB
- March AFB (USW00023119) is a weather station in California, United States at 33.90 latitude and -117.25 longitude, 468 m (1,536 ft) above sea level.
- The station reports from 1949 to 2026, 78 years of record.
- 1,464 records set at March AFB still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- March AFB set a daily record low maximum temperature of 17.7 C (63.9 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: California, United States, 33.90 latitude, -117.25 longitude.
- Elevation: 468 m (1,536 ft).
- Period of record: 1949 to 2026, 78 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
31 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 30.0 C (86.0 F) | -7.8 C (18.0 F) | 27.2 C (81.0 F) | -2.2 C (28.0 F) |
| Feb | 31.1 C (88.0 F) | -7.1 C (19.2 F) | 31.1 C (88.0 F) | 0.0 C (32.0 F) |
| Mar | 37.8 C (100.0 F) | -3.9 C (25.0 F) | 37.8 C (100.0 F) | 2.8 C (37.0 F) |
| Apr | 36.1 C (97.0 F) | -2.8 C (27.0 F) | 31.1 C (88.0 F) | 4.4 C (39.9 F) |
| May | 39.4 C (102.9 F) | 0.6 C (33.1 F) | 37.2 C (99.0 F) | 6.7 C (44.1 F) |
| Jun | 43.9 C (111.0 F) | 5.0 C (41.0 F) | 37.2 C (99.0 F) | 11.7 C (53.1 F) |
| Jul | 44.4 C (111.9 F) | 9.4 C (48.9 F) | 40.6 C (105.1 F) | 12.2 C (54.0 F) |
| Aug | 43.3 C (109.9 F) | 10.0 C (50.0 F) | 41.6 C (106.9 F) | 17.6 C (63.7 F) |
| Sep | 46.7 C (116.1 F) | 6.1 C (43.0 F) | 40.7 C (105.3 F) | 13.0 C (55.4 F) |
| Oct | 42.2 C (108.0 F) | 1.1 C (34.0 F) | 38.8 C (101.8 F) | 14.2 C (57.6 F) |
| Nov | 33.9 C (93.0 F) | -3.3 C (26.1 F) | n/a | n/a |
| Dec | 32.2 C (90.0 F) | -8.3 C (17.1 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1949 | 70 |
| 1950 | 38 |
| 1951 | 26 |
| 1952 | 31 |
| 1953 | 41 |
| 1954 | 41 |
| 1955 | 36 |
| 1956 | 27 |
| 1957 | 41 |
| 1958 | 42 |
| 1959 | 34 |
| 1960 | 38 |
| 1961 | 29 |
| 1962 | 46 |
| 1963 | 51 |
| 1964 | 50 |
| 1965 | 55 |
| 1966 | 45 |
| 1967 | 46 |
| 1968 | 48 |
| 1969 | 46 |
| 1970 | 43 |
| 2011 | 30 |
| 2012 | 42 |
| 2013 | 38 |
| 2014 | 30 |
| 2015 | 36 |
| 2016 | 27 |
| 2017 | 34 |
| 2018 | 28 |
| 2019 | 34 |
| 2020 | 49 |
| 2021 | 32 |
| 2022 | 45 |
| 2023 | 27 |
| 2024 | 24 |
| 2025 | 24 |
| 2026 | 40 |
All-Time Record Progression
2 new records| Date | Kind | Detail |
|---|---|---|
| 2020-09-05 | Record high maximum temperature | Record high maximum temperature 46.1 C (115.0 F) |
| 2020-09-06 | Record high maximum temperature | Record high maximum temperature 46.7 C (116.1 F) |
Wettest Day of Each Month
Jan: 58.7 mm (2.3 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 58.7 mm (2.3 in) | 26 January 1956 |
| Feb | 53.1 mm (2.1 in) | 25 February 1969 |
| Mar | 47.8 mm (1.9 in) | 12 March 2020 |
| Apr | 39.9 mm (1.6 in) | 1 April 1965 |
| May | 12.4 mm (0.5 in) | 11 May 1957 |
| Jun | 4.1 mm (0.16 in) | 9 June 1957 |
| Jul | 26.4 mm (1.0 in) | 28 July 1968 |
| Aug | 57.7 mm (2.3 in) | 30 August 2012 |
| Sep | 49.3 mm (1.9 in) | 17 September 1963 |
| Oct | 19.3 mm (0.8 in) | 12 October 2018 |
| Nov | 53.3 mm (2.1 in) | 22 November 1965 |
| Dec | 47.8 mm (1.9 in) | 3 December 1966 |
Period of Record Coverage
1949 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1949 | 365 | 100% | Yes |
| 1950 | 365 | 100% | Yes |
| 1951 | 364 | 100% | Yes |
| 1952 | 366 | 100% | Yes |
| 1953 | 364 | 100% | Yes |
| 1954 | 365 | 100% | Yes |
| 1955 | 365 | 100% | Yes |
| 1956 | 366 | 100% | Yes |
| 1957 | 365 | 100% | Yes |
| 1958 | 365 | 100% | Yes |
| 1959 | 365 | 100% | Yes |
| 1960 | 366 | 100% | Yes |
| 1961 | 365 | 100% | Yes |
| 1962 | 365 | 100% | Yes |
| 1963 | 365 | 100% | Yes |
| 1964 | 366 | 100% | Yes |
| 1965 | 365 | 100% | Yes |
| 1966 | 365 | 100% | Yes |
| 1967 | 364 | 100% | Yes |
| 1968 | 366 | 100% | Yes |
| 1969 | 365 | 100% | Yes |
| 1970 | 365 | 100% | Yes |
| 2011 | 122 | 33% | No |
| 2012 | 361 | 99% | Yes |
| 2013 | 359 | 98% | Yes |
| 2014 | 365 | 100% | Yes |
| 2015 | 363 | 99% | Yes |
| 2016 | 363 | 99% | Yes |
| 2017 | 345 | 95% | Yes |
| 2018 | 311 | 85% | No |
| 2019 | 325 | 89% | No |
| 2020 | 366 | 100% | Yes |
| 2021 | 360 | 99% | Yes |
| 2022 | 363 | 99% | Yes |
| 2023 | 364 | 100% | Yes |
| 2024 | 366 | 100% | Yes |
| 2025 | 359 | 98% | Yes |
| 2026 | 282 | 77% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 12 October 2026 | March AFB, US | daily low max (Provisional) | 17.7 C (63.9 F) | 1.2 C (2.2 F) | 68 years | 29 of 100 (Routine) |
| 11 October 2026 | March AFB, US | monthly rain (Provisional) | 29.0 mm (1.1 in) | 9.7 mm (0.38 in) | 7 years | 42 of 100 (Notable) |
| 11 October 2026 | March AFB, US | daily high min (Tie, Provisional) | 16.7 C (62.1 F) | tie | 4 years | 2 of 100 (Routine) |
| 9 October 2026 | March AFB, US | daily high min (Provisional) | 18.5 C (65.3 F) | 2.4 C (4.3 F) | 75 years | 36 of 100 (Notable) |
| 8 October 2026 | March AFB, US | daily high min (Provisional) | 17.8 C (64.0 F) | 1.1 C (2.0 F) | 4 years | 11 of 100 (Routine) |
| 7 October 2026 | March AFB, US | daily high min (Provisional) | 19.6 C (67.3 F) | 1.3 C (2.3 F) | 61 years | 29 of 100 (Routine) |
| 6 October 2026 | March AFB, US | daily high min (Provisional) | 21.1 C (70.0 F) | 2.8 C (5.0 F) | 65 years | 34 of 100 (Routine) |
| 5 October 2026 | March AFB, US | daily high min (Provisional) | 19.9 C (67.8 F) | 3.2 C (5.8 F) | 73 years | 38 of 100 (Notable) |
| 4 October 2026 | March AFB, US | daily high min (Provisional) | 19.1 C (66.4 F) | 1.3 C (2.3 F) | 4 years | 12 of 100 (Routine) |
| 3 October 2026 | March AFB, US | daily high min (Provisional) | 19.3 C (66.7 F) | 1.0 C (1.8 F) | 68 years | 30 of 100 (Routine) |
| 10 September 2026 | March AFB, US | daily high min (Provisional) | 24.0 C (75.2 F) | 1.2 C (2.2 F) | 11 years | 13 of 100 (Routine) |
| 9 September 2026 | March AFB, US | daily high max (Provisional) | 40.7 C (105.3 F) | 0.1 C (0.2 F) | 1 year | 7 of 100 (Routine) |
| 7 September 2026 | March AFB, US | daily rain (Provisional) | 0.8 mm (0.03 in) | 0.8 mm (0.03 in) | 76 years | 20 of 100 (Routine) |
| 6 September 2026 | March AFB, US | daily rain (Provisional) | 9.7 mm (0.38 in) | 5.9 mm (0.23 in) | 56 years | 20 of 100 (Routine) |
| 29 August 2026 | March AFB, US | daily high min (Provisional) | 23.5 C (74.3 F) | 1.3 C (2.3 F) | 4 years | 12 of 100 (Routine) |
| 28 August 2026 | March AFB, US | daily high min (Provisional) | 24.7 C (76.5 F) | 3.6 C (6.5 F) | 4 years | 20 of 100 (Routine) |
| 27 August 2026 | March AFB, US | all-time high min (Tie, Provisional) | 26.1 C (79.0 F) | tie | 58 years | 11 of 100 (Routine) |
| 26 August 2026 | March AFB, US | daily high max (Provisional) | 41.6 C (106.9 F) | 2.2 C (4.0 F) | 8 years | 15 of 100 (Routine) |
| 26 August 2026 | March AFB, US | daily high min (Provisional) | 22.8 C (73.0 F) | 0.6 C (1.1 F) | 12 years | 12 of 100 (Routine) |
| 24 August 2026 | March AFB, US | daily high min (Provisional) | 21.9 C (71.4 F) | 0.8 C (1.4 F) | 59 years | 26 of 100 (Routine) |
Climate Trend
33 complete years, 1949 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1949 | 16.5 C | -0.79 C |
| 1950 | 17.2 C | -0.04 C |
| 1951 | 16.8 C | -0.50 C |
| 1952 | 16.6 C | -0.64 C |
| 1953 | 16.9 C | -0.32 C |
| 1954 | 17.4 C | +0.13 C |
| 1955 | 16.8 C | -0.48 C |
| 1956 | 17.3 C | +0.00 C |
| 1957 | 17.3 C | +0.02 C |
| 1958 | 18.1 C | +0.84 C |
| 1959 | 18.4 C | +1.11 C |
| 1960 | 17.7 C | +0.49 C |
| 1961 | 17.5 C | +0.23 C |
| 1962 | 16.6 C | -0.66 C |
| 1963 | 16.3 C | -0.97 C |
| 1964 | 15.7 C | -1.54 C |
| 1965 | 16.1 C | -1.12 C |
| 1966 | 16.8 C | -0.45 C |
| 1967 | 16.8 C | -0.45 C |
| 1968 | 16.6 C | -0.69 C |
| 1969 | 16.3 C | -1.00 C |
| 1970 | 16.7 C | -0.51 C |
| 2012 | 17.8 C | +0.52 C |
| 2013 | 17.3 C | +0.01 C |
| 2014 | 18.7 C | +1.46 C |
| 2015 | 18.1 C | +0.87 C |
| 2016 | 18.2 C | +0.93 C |
| 2020 | 17.6 C | +0.30 C |
| 2021 | 18.0 C | +0.78 C |
| 2022 | 18.7 C | +1.48 C |
| 2023 | 16.8 C | -0.47 C |
| 2024 | 17.7 C | +0.45 C |
| 2025 | 18.2 C | +0.92 C |
The annual mean temperature here has risen by 0.2 C (0.1 to 0.2) per decade over 1949 to 2025. In Fahrenheit: 0.3 F (0.1 to 0.4) 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 | 0.2 C (0.1 to 0.2) per decade | 0.3 F (0.1 to 0.4) per decade | 1949 to 2025 | 33 | Rise |
| Mean daily maximum | 0.3 C (0.2 to 0.4) per decade | 0.5 F (0.4 to 0.7) per decade | 1949 to 2025 | 33 | Rise |
| Mean daily minimum | 0.01 C (-0.09 to 0.11) per decade | 0.01 F (-0.17 to 0.20) per decade | 1949 to 2025 | 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
1949 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 46.7 C (116.1 F) | 2020 | 41.1 C (106.0 F) | 38 |
| Coldest night (TNn) | -8.3 C (17.1 F) | 1968 | -3.5 C (25.6 F) | 38 |
| Wettest day (Rx1day) | 58.7 mm (2.3 in) | 1956 | 31.9 mm (1.3 in) | 38 |
| Wettest five days (Rx5day) | 148.1 mm (5.8 in) | 1969 | 51.2 mm (2.0 in) | 38 |
| Longest dry spell (CDD) | 211 days | 1962 | 122 days | 38 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1949 | 41.7 C (107.1 F) |
| 1950 | 41.1 C (106.0 F) |
| 1951 | 40.0 C (104.0 F) |
| 1952 | 38.3 C (100.9 F) |
| 1953 | 40.0 C (104.0 F) |
| 1954 | 38.9 C (102.0 F) |
| 1955 | 43.3 C (109.9 F) |
| 1956 | 40.6 C (105.1 F) |
| 1957 | 40.6 C (105.1 F) |
| 1958 | 41.7 C (107.1 F) |
| 1959 | 41.7 C (107.1 F) |
| 1960 | 42.2 C (108.0 F) |
| 1961 | 43.3 C (109.9 F) |
| 1962 | 40.6 C (105.1 F) |
| 1963 | 39.4 C (102.9 F) |
| 1964 | 40.6 C (105.1 F) |
| 1965 | 41.1 C (106.0 F) |
| 1966 | 38.9 C (102.0 F) |
| 1967 | 42.8 C (109.0 F) |
| 1968 | 40.0 C (104.0 F) |
| 1969 | 41.1 C (106.0 F) |
| 1970 | 41.7 C (107.1 F) |
| 2011 | 39.4 C (102.9 F) |
| 2012 | 41.7 C (107.1 F) |
| 2013 | 42.8 C (109.0 F) |
| 2014 | 41.1 C (106.0 F) |
| 2015 | 40.6 C (105.1 F) |
| 2016 | 43.9 C (111.0 F) |
| 2017 | 42.8 C (109.0 F) |
| 2018 | 44.4 C (111.9 F) |
| 2019 | 40.0 C (104.0 F) |
| 2020 | 46.7 C (116.1 F) |
| 2021 | 40.0 C (104.0 F) |
| 2022 | 43.9 C (111.0 F) |
| 2023 | 40.0 C (104.0 F) |
| 2024 | 45.0 C (113.0 F) |
| 2025 | 40.6 C (105.1 F) |
| 2026 | 41.6 C (106.9 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1949 | -5.0 C (23.0 F) |
| 1950 | -3.3 C (26.1 F) |
| 1951 | -1.7 C (28.9 F) |
| 1952 | -2.8 C (27.0 F) |
| 1953 | -2.8 C (27.0 F) |
| 1954 | -2.2 C (28.0 F) |
| 1955 | -2.2 C (28.0 F) |
| 1956 | -1.7 C (28.9 F) |
| 1957 | 0.0 C (32.0 F) |
| 1958 | -3.3 C (26.1 F) |
| 1959 | 0.6 C (33.1 F) |
| 1960 | -3.9 C (25.0 F) |
| 1961 | -1.1 C (30.0 F) |
| 1962 | -5.0 C (23.0 F) |
| 1963 | -7.8 C (18.0 F) |
| 1964 | -3.3 C (26.1 F) |
| 1965 | -5.6 C (21.9 F) |
| 1966 | -3.9 C (25.0 F) |
| 1967 | -3.9 C (25.0 F) |
| 1968 | -8.3 C (17.1 F) |
| 1969 | -6.7 C (19.9 F) |
| 1970 | -6.1 C (21.0 F) |
| 2011 | -5.5 C (22.1 F) |
| 2012 | -3.8 C (25.2 F) |
| 2013 | -5.5 C (22.1 F) |
| 2014 | -3.2 C (26.2 F) |
| 2015 | -4.9 C (23.2 F) |
| 2016 | -3.2 C (26.2 F) |
| 2017 | -1.6 C (29.1 F) |
| 2018 | -4.9 C (23.2 F) |
| 2019 | -4.3 C (24.3 F) |
| 2020 | -7.1 C (19.2 F) |
| 2021 | -3.8 C (25.2 F) |
| 2022 | -3.2 C (26.2 F) |
| 2023 | -4.3 C (24.3 F) |
| 2024 | -2.7 C (27.1 F) |
| 2025 | -2.2 C (28.0 F) |
| 2026 | -2.2 C (28.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1949 | 18.5 mm (0.7 in) |
| 1950 | 26.9 mm (1.1 in) |
| 1951 | 35.8 mm (1.4 in) |
| 1952 | 45.7 mm (1.8 in) |
| 1953 | 15.7 mm (0.6 in) |
| 1954 | 57.4 mm (2.3 in) |
| 1955 | 36.6 mm (1.4 in) |
| 1956 | 58.7 mm (2.3 in) |
| 1957 | 34.8 mm (1.4 in) |
| 1958 | 40.1 mm (1.6 in) |
| 1959 | 25.7 mm (1.0 in) |
| 1960 | 21.6 mm (0.9 in) |
| 1961 | 26.2 mm (1.0 in) |
| 1962 | 21.1 mm (0.8 in) |
| 1963 | 49.3 mm (1.9 in) |
| 1964 | 19.6 mm (0.8 in) |
| 1965 | 53.3 mm (2.1 in) |
| 1966 | 47.8 mm (1.9 in) |
| 1967 | 32.5 mm (1.3 in) |
| 1968 | 26.4 mm (1.0 in) |
| 1969 | 53.1 mm (2.1 in) |
| 1970 | 34.8 mm (1.4 in) |
| 2011 | 14.5 mm (0.6 in) |
| 2012 | 57.7 mm (2.3 in) |
| 2013 | 15.2 mm (0.6 in) |
| 2014 | 27.4 mm (1.1 in) |
| 2015 | 24.9 mm (1.0 in) |
| 2016 | 20.8 mm (0.8 in) |
| 2017 | 26.2 mm (1.0 in) |
| 2018 | 34.5 mm (1.4 in) |
| 2019 | 46.2 mm (1.8 in) |
| 2020 | 47.8 mm (1.9 in) |
| 2021 | 24.9 mm (1.0 in) |
| 2022 | 31.2 mm (1.2 in) |
| 2023 | 50.0 mm (2.0 in) |
| 2024 | 52.3 mm (2.1 in) |
| 2025 | 30.7 mm (1.2 in) |
| 2026 | 29.0 mm (1.1 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1949 | 41.6 mm (1.6 in) |
| 1950 | 40.3 mm (1.6 in) |
| 1951 | 72.7 mm (2.9 in) |
| 1952 | 89.4 mm (3.5 in) |
| 1953 | 25.4 mm (1.0 in) |
| 1954 | 68.9 mm (2.7 in) |
| 1955 | 50.5 mm (2.0 in) |
| 1956 | 78.8 mm (3.1 in) |
| 1957 | 43.7 mm (1.7 in) |
| 1958 | 67.6 mm (2.7 in) |
| 1959 | 44.5 mm (1.8 in) |
| 1960 | 48.0 mm (1.9 in) |
| 1961 | 29.5 mm (1.2 in) |
| 1962 | 43.5 mm (1.7 in) |
| 1963 | 67.3 mm (2.6 in) |
| 1964 | 32.1 mm (1.3 in) |
| 1965 | 103.9 mm (4.1 in) |
| 1966 | 94.4 mm (3.7 in) |
| 1967 | 74.6 mm (2.9 in) |
| 1968 | 37.9 mm (1.5 in) |
| 1969 | 148.1 mm (5.8 in) |
| 1970 | 59.2 mm (2.3 in) |
| 2011 | 15.5 mm (0.6 in) |
| 2012 | 57.7 mm (2.3 in) |
| 2013 | 18.3 mm (0.7 in) |
| 2014 | 45.2 mm (1.8 in) |
| 2015 | 35.4 mm (1.4 in) |
| 2016 | 57.1 mm (2.2 in) |
| 2017 | 65.8 mm (2.6 in) |
| 2018 | 36.5 mm (1.4 in) |
| 2019 | 53.1 mm (2.1 in) |
| 2020 | 82.3 mm (3.2 in) |
| 2021 | 39.6 mm (1.6 in) |
| 2022 | 33.3 mm (1.3 in) |
| 2023 | 52.8 mm (2.1 in) |
| 2024 | 88.1 mm (3.5 in) |
| 2025 | 51.8 mm (2.0 in) |
| 2026 | 31.2 mm (1.2 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1949 | 177 days |
| 1950 | 193 days |
| 1951 | 39 days |
| 1952 | 143 days |
| 1953 | 100 days |
| 1954 | 98 days |
| 1955 | 189 days |
| 1956 | 76 days |
| 1957 | 123 days |
| 1958 | 95 days |
| 1959 | 139 days |
| 1960 | 135 days |
| 1961 | 142 days |
| 1962 | 211 days |
| 1963 | 130 days |
| 1964 | 140 days |
| 1965 | 107 days |
| 1966 | 188 days |
| 1967 | 93 days |
| 1968 | 54 days |
| 1969 | 81 days |
| 1970 | 120 days |
| 2011 | 34 days |
| 2012 | 77 days |
| 2013 | 114 days |
| 2014 | 97 days |
| 2015 | 63 days |
| 2016 | 136 days |
| 2017 | 154 days |
| 2018 | 136 days |
| 2019 | 110 days |
| 2020 | 203 days |
| 2021 | 99 days |
| 2022 | 139 days |
| 2023 | 49 days |
| 2024 | 125 days |
| 2025 | 129 days |
| 2026 | 87 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
30 years with a frostAcross 30 years with a frost, the median last spring frost at March AFB falls on 4 March and the median first autumn frost on 1 December, which leaves a median of 271 days between them.
Fitted over all years, the growing season changes by -1.1 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1949 to 2024) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 4 March | n/a | 4 March | n/a | -0.3 days per decade |
| First autumn frost | 1 December | n/a | 1 December | n/a | -1.4 days per decade |
| Growing days | 271 days | n/a | 271 days | n/a | -1.1 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, 1949 to 2025A day with at least 34.0 mm (1.3 in) of rain is expected about once in 2 years. A day with at least 73.1 mm (2.9 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 34.0 mm (1.3 in) | |
| 5 years | 46.5 mm (1.8 in) | |
| 10 years | 53.8 mm (2.1 in) | |
| 25 years | 62.3 mm (2.5 in) | |
| 50 years | 67.9 mm (2.7 in) | Longer than the 35 years of record |
| 100 years | 73.1 mm (2.9 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 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: 58.7 mm (2.3 in) in 1956; 57.7 mm (2.3 in) in 2012; 57.4 mm (2.3 in) in 1954.
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 (2026-10-17).