Caohekou Weather Records (CHM00054483)
Record envelope, standing records and threshold days for Caohekou (CHM00054483), China, with 40 years of record.
Key Facts for Caohekou
- Caohekou (CHM00054483) is a weather station in China at 40.88 latitude and 123.90 longitude, 235 m (771 ft) above sea level.
- The station reports from 1952 to 1991, 40 years of record.
- 1,464 records set at Caohekou still stand.
- Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
- Caohekou set a daily record low maximum temperature of 20.6 C (69.1 F) on 27 June 1991.
About the Station
- Location: China, 40.88 latitude, 123.90 longitude.
- Elevation: 235 m (771 ft).
- Period of record: 1952 to 1991, 40 years.
- Eligible elements: tmax, tmin, prcp.
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 | 7.4 C (45.3 F) | -31.7 C (-25.1 F) | n/a | n/a |
| Feb | 10.3 C (50.5 F) | -28.4 C (-19.1 F) | n/a | n/a |
| Mar | 18.6 C (65.5 F) | -26.1 C (-15.0 F) | n/a | n/a |
| Apr | 28.0 C (82.4 F) | -15.5 C (4.1 F) | n/a | n/a |
| May | 33.2 C (91.8 F) | -3.1 C (26.4 F) | n/a | n/a |
| Jun | 33.1 C (91.6 F) | 2.7 C (36.9 F) | n/a | n/a |
| Jul | 36.1 C (97.0 F) | 9.1 C (48.4 F) | n/a | n/a |
| Aug | 35.3 C (95.5 F) | 4.4 C (39.9 F) | n/a | n/a |
| Sep | 31.7 C (89.1 F) | -2.4 C (27.7 F) | n/a | n/a |
| Oct | 27.2 C (81.0 F) | -10.4 C (13.3 F) | n/a | n/a |
| Nov | 18.6 C (65.5 F) | -22.2 C (-8.0 F) | n/a | n/a |
| Dec | 11.0 C (51.8 F) | -30.5 C (-22.9 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1952 | 18 |
| 1953 | 43 |
| 1954 | 30 |
| 1955 | 36 |
| 1956 | 48 |
| 1957 | 50 |
| 1958 | 59 |
| 1959 | 40 |
| 1960 | 28 |
| 1961 | 30 |
| 1962 | 40 |
| 1963 | 26 |
| 1964 | 38 |
| 1965 | 41 |
| 1966 | 54 |
| 1967 | 41 |
| 1968 | 39 |
| 1969 | 34 |
| 1970 | 36 |
| 1971 | 35 |
| 1972 | 42 |
| 1973 | 26 |
| 1974 | 40 |
| 1975 | 27 |
| 1976 | 42 |
| 1977 | 41 |
| 1978 | 26 |
| 1979 | 44 |
| 1980 | 50 |
| 1981 | 42 |
| 1982 | 45 |
| 1983 | 34 |
| 1984 | 20 |
| 1985 | 23 |
| 1986 | 33 |
| 1987 | 33 |
| 1988 | 23 |
| 1989 | 39 |
| 1990 | 51 |
| 1991 | 17 |
Wettest Day of Each Month
Aug: 193.4 mm (7.6 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 19.8 mm (0.8 in) | 12 January 1964 |
| Feb | 41.1 mm (1.6 in) | 10 February 1962 |
| Mar | 26.9 mm (1.1 in) | 29 March 1968 |
| Apr | 76.6 mm (3.0 in) | 26 April 1983 |
| May | 51.1 mm (2.0 in) | 31 May 1974 |
| Jun | 71.7 mm (2.8 in) | 18 June 1967 |
| Jul | 150.5 mm (5.9 in) | 21 July 1985 |
| Aug | 193.4 mm (7.6 in) | 4 August 1960 |
| Sep | 83.7 mm (3.3 in) | 4 September 1956 |
| Oct | 56.6 mm (2.2 in) | 29 October 1977 |
| Nov | 36.5 mm (1.4 in) | 3 November 1976 |
| Dec | 29.2 mm (1.1 in) | 2 December 1975 |
Period of Record Coverage
1952 to 1991| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1952 | 184 | 50% | No |
| 1953 | 365 | 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 | 365 | 100% | Yes |
| 1968 | 366 | 100% | Yes |
| 1969 | 365 | 100% | Yes |
| 1970 | 365 | 100% | Yes |
| 1971 | 365 | 100% | Yes |
| 1972 | 366 | 100% | Yes |
| 1973 | 365 | 100% | Yes |
| 1974 | 365 | 100% | Yes |
| 1975 | 365 | 100% | Yes |
| 1976 | 366 | 100% | Yes |
| 1977 | 365 | 100% | Yes |
| 1978 | 365 | 100% | Yes |
| 1979 | 365 | 100% | Yes |
| 1980 | 366 | 100% | Yes |
| 1981 | 365 | 100% | Yes |
| 1982 | 365 | 100% | Yes |
| 1983 | 365 | 100% | Yes |
| 1984 | 366 | 100% | Yes |
| 1985 | 365 | 100% | Yes |
| 1986 | 365 | 100% | Yes |
| 1987 | 365 | 100% | Yes |
| 1988 | 366 | 100% | Yes |
| 1989 | 365 | 100% | Yes |
| 1990 | 365 | 100% | Yes |
| 1991 | 181 | 50% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 27 June 1991 | Caohekou, CN | daily low max | 20.6 C (69.1 F) | 0.7 C (1.3 F) | 32 years | 14 of 100 (Routine) |
| 26 June 1991 | Caohekou, CN | daily rain | 30.1 mm (1.2 in) | 4.9 mm (0.19 in) | 8 years | 10 of 100 (Routine) |
| 17 June 1991 | Caohekou, CN | daily low min | 7.1 C (44.8 F) | 3.1 C (5.6 F) | 5 years | 14 of 100 (Routine) |
| 12 June 1991 | Caohekou, CN | daily high min | 17.3 C (63.1 F) | 0.4 C (0.7 F) | 20 years | 11 of 100 (Routine) |
| 11 June 1991 | Caohekou, CN | daily high min | 18.9 C (66.0 F) | 2.3 C (4.1 F) | 2 years | 11 of 100 (Routine) |
| 10 June 1991 | Caohekou, CN | daily high min | 17.5 C (63.5 F) | 0.3 C (0.5 F) | 10 years | 7 of 100 (Routine) |
| 9 June 1991 | Caohekou, CN | daily high min | 17.0 C (62.6 F) | 0.8 C (1.4 F) | 17 years | 11 of 100 (Routine) |
| 14 May 1991 | Caohekou, CN | daily high min | 12.4 C (54.3 F) | 1.9 C (3.4 F) | 24 years | 16 of 100 (Routine) |
| 25 April 1991 | Caohekou, CN | daily rain | 26.9 mm (1.1 in) | 8.1 mm (0.32 in) | 16 years | 20 of 100 (Routine) |
| 20 April 1991 | Caohekou, CN | daily low min | -3.2 C (26.2 F) | 0.1 C (0.2 F) | 8 years | 6 of 100 (Routine) |
| 12 April 1991 | Caohekou, CN | daily high min | 7.4 C (45.3 F) | 0.5 C (0.9 F) | 36 years | 16 of 100 (Routine) |
| 10 April 1991 | Caohekou, CN | daily high min | 6.6 C (43.9 F) | 1.7 C (3.1 F) | 26 years | 16 of 100 (Routine) |
| 10 April 1991 | Caohekou, CN | daily high max | 20.7 C (69.3 F) | 2.4 C (4.3 F) | 9 years | 10 of 100 (Routine) |
| 5 April 1991 | Caohekou, CN | daily high min | 4.0 C (39.2 F) | 0.7 C (1.3 F) | 9 years | 7 of 100 (Routine) |
| 30 March 1991 | Caohekou, CN | daily low max | 1.1 C (34.0 F) | 1.5 C (2.7 F) | 33 years | 17 of 100 (Routine) |
| 24 March 1991 | Caohekou, CN | daily high max | 14.6 C (58.3 F) | 0.8 C (1.4 F) | 12 years | 8 of 100 (Routine) |
| 19 March 1991 | Caohekou, CN | daily high min | 3.6 C (38.5 F) | 1.6 C (2.9 F) | 28 years | 15 of 100 (Routine) |
| 23 February 1991 | Caohekou, CN | daily low max | -11.7 C (10.9 F) | 0.2 C (0.4 F) | 21 years | 10 of 100 (Routine) |
| 22 February 1991 | Caohekou, CN | daily low max | -14.2 C (6.4 F) | 3.7 C (6.7 F) | 24 years | 18 of 100 (Routine) |
| 31 December 1990 | Caohekou, CN | daily rain | 3.9 mm (0.15 in) | 1.2 mm (0.05 in) | 25 years | 13 of 100 (Routine) |
Climate Trend
38 complete years, 1953 to 1990| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1953 | 6.1 C | -0.65 C |
| 1954 | 6.7 C | -0.01 C |
| 1955 | 7.2 C | +0.52 C |
| 1956 | 5.5 C | -1.24 C |
| 1957 | 5.9 C | -0.78 C |
| 1958 | 7.0 C | +0.29 C |
| 1959 | 7.5 C | +0.75 C |
| 1960 | 6.9 C | +0.22 C |
| 1961 | 7.3 C | +0.55 C |
| 1962 | 6.9 C | +0.21 C |
| 1963 | 6.8 C | +0.05 C |
| 1964 | 6.7 C | -0.01 C |
| 1965 | 6.4 C | -0.31 C |
| 1966 | 6.3 C | -0.36 C |
| 1967 | 6.7 C | -0.02 C |
| 1968 | 6.7 C | 0.00 C |
| 1969 | 5.5 C | -1.17 C |
| 1970 | 6.4 C | -0.29 C |
| 1971 | 6.4 C | -0.28 C |
| 1972 | 6.7 C | -0.05 C |
| 1973 | 7.1 C | +0.38 C |
| 1974 | 6.5 C | -0.16 C |
| 1975 | 7.3 C | +0.56 C |
| 1976 | 6.1 C | -0.56 C |
| 1977 | 6.8 C | +0.13 C |
| 1978 | 6.8 C | +0.13 C |
| 1979 | 6.8 C | +0.07 C |
| 1980 | 5.8 C | -0.90 C |
| 1981 | 6.3 C | -0.38 C |
| 1982 | 7.3 C | +0.63 C |
| 1983 | 7.4 C | +0.65 C |
| 1984 | 6.5 C | -0.23 C |
| 1985 | 6.1 C | -0.62 C |
| 1986 | 6.5 C | -0.16 C |
| 1987 | 6.6 C | -0.09 C |
| 1988 | 7.1 C | +0.44 C |
| 1989 | 8.0 C | +1.31 C |
| 1990 | 8.2 C | +1.48 C |
The fitted trend in annual mean temperature here over 1953 to 1990 is 0.14 C (-0.03 to 0.32) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.3 F (-0.1 to 0.6) per decade. The slope is a straight line fitted to 38 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.14 C (-0.03 to 0.32) per decade | 0.3 F (-0.1 to 0.6) per decade | 1953 to 1990 | 38 | Not clearly different from zero |
| Mean daily maximum | 0.1 C (-0.1 to 0.3) per decade | 0.2 F (-0.2 to 0.5) per decade | 1953 to 1990 | 38 | Not clearly different from zero |
| Mean daily minimum | 0.18 C (0.01 to 0.36) per decade | 0.33 F (0.01 to 0.64) per decade | 1953 to 1990 | 38 | 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
1952 to 1991| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 36.1 C (97.0 F) | 1958 | 32.5 C (90.5 F) | 40 |
| Coldest night (TNn) | -31.7 C (-25.1 F) | 1966 | -27.0 C (-16.7 F) | 40 |
| Wettest day (Rx1day) | 193.4 mm (7.6 in) | 1960 | 80.4 mm (3.2 in) | 40 |
| Wettest five days (Rx5day) | 274.6 mm (10.8 in) | 1960 | 137.5 mm (5.4 in) | 40 |
| Longest dry spell (CDD) | 52 days | 1984 | 32 days | 40 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1952 | 33.6 C (92.5 F) |
| 1953 | 32.6 C (90.7 F) |
| 1954 | 31.0 C (87.8 F) |
| 1955 | 34.3 C (93.7 F) |
| 1956 | 33.1 C (91.6 F) |
| 1957 | 30.5 C (86.9 F) |
| 1958 | 36.1 C (97.0 F) |
| 1959 | 32.0 C (89.6 F) |
| 1960 | 30.5 C (86.9 F) |
| 1961 | 33.5 C (92.3 F) |
| 1962 | 33.2 C (91.8 F) |
| 1963 | 33.1 C (91.6 F) |
| 1964 | 33.9 C (93.0 F) |
| 1965 | 31.7 C (89.1 F) |
| 1966 | 32.4 C (90.3 F) |
| 1967 | 32.9 C (91.2 F) |
| 1968 | 34.5 C (94.1 F) |
| 1969 | 31.5 C (88.7 F) |
| 1970 | 32.5 C (90.5 F) |
| 1971 | 31.4 C (88.5 F) |
| 1972 | 33.5 C (92.3 F) |
| 1973 | 31.2 C (88.2 F) |
| 1974 | 33.9 C (93.0 F) |
| 1975 | 33.3 C (91.9 F) |
| 1976 | 31.0 C (87.8 F) |
| 1977 | 31.5 C (88.7 F) |
| 1978 | 32.3 C (90.1 F) |
| 1979 | 33.2 C (91.8 F) |
| 1980 | 31.5 C (88.7 F) |
| 1981 | 32.2 C (90.0 F) |
| 1982 | 32.9 C (91.2 F) |
| 1983 | 33.1 C (91.6 F) |
| 1984 | 32.3 C (90.1 F) |
| 1985 | 30.4 C (86.7 F) |
| 1986 | 30.5 C (86.9 F) |
| 1987 | 31.2 C (88.2 F) |
| 1988 | 33.5 C (92.3 F) |
| 1989 | 35.3 C (95.5 F) |
| 1990 | 32.5 C (90.5 F) |
| 1991 | 29.4 C (84.9 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1952 | -25.4 C (-13.7 F) |
| 1953 | -28.4 C (-19.1 F) |
| 1954 | -22.5 C (-8.5 F) |
| 1955 | -24.6 C (-12.3 F) |
| 1956 | -30.5 C (-22.9 F) |
| 1957 | -28.0 C (-18.4 F) |
| 1958 | -30.4 C (-22.7 F) |
| 1959 | -30.4 C (-22.7 F) |
| 1960 | -26.6 C (-15.9 F) |
| 1961 | -26.5 C (-15.7 F) |
| 1962 | -24.6 C (-12.3 F) |
| 1963 | -28.0 C (-18.4 F) |
| 1964 | -27.6 C (-17.7 F) |
| 1965 | -28.4 C (-19.1 F) |
| 1966 | -31.7 C (-25.1 F) |
| 1967 | -28.8 C (-19.8 F) |
| 1968 | -26.6 C (-15.9 F) |
| 1969 | -26.8 C (-16.2 F) |
| 1970 | -28.8 C (-19.8 F) |
| 1971 | -27.9 C (-18.2 F) |
| 1972 | -25.4 C (-13.7 F) |
| 1973 | -26.9 C (-16.4 F) |
| 1974 | -23.8 C (-10.8 F) |
| 1975 | -27.0 C (-16.6 F) |
| 1976 | -28.0 C (-18.4 F) |
| 1977 | -27.0 C (-16.6 F) |
| 1978 | -26.5 C (-15.7 F) |
| 1979 | -27.3 C (-17.1 F) |
| 1980 | -26.3 C (-15.3 F) |
| 1981 | -27.2 C (-17.0 F) |
| 1982 | -27.1 C (-16.8 F) |
| 1983 | -27.1 C (-16.8 F) |
| 1984 | -24.9 C (-12.8 F) |
| 1985 | -30.2 C (-22.4 F) |
| 1986 | -27.2 C (-17.0 F) |
| 1987 | -25.1 C (-13.2 F) |
| 1988 | -23.9 C (-11.0 F) |
| 1989 | -21.3 C (-6.3 F) |
| 1990 | -28.7 C (-19.7 F) |
| 1991 | -26.9 C (-16.4 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1952 | 79.9 mm (3.1 in) |
| 1953 | 126.3 mm (5.0 in) |
| 1954 | 100.4 mm (4.0 in) |
| 1955 | 80.8 mm (3.2 in) |
| 1956 | 83.7 mm (3.3 in) |
| 1957 | 98.1 mm (3.9 in) |
| 1958 | 95.5 mm (3.8 in) |
| 1959 | 53.1 mm (2.1 in) |
| 1960 | 193.4 mm (7.6 in) |
| 1961 | 80.8 mm (3.2 in) |
| 1962 | 90.6 mm (3.6 in) |
| 1963 | 104.4 mm (4.1 in) |
| 1964 | 128.9 mm (5.1 in) |
| 1965 | 74.9 mm (2.9 in) |
| 1966 | 73.0 mm (2.9 in) |
| 1967 | 80.1 mm (3.2 in) |
| 1968 | 59.1 mm (2.3 in) |
| 1969 | 77.8 mm (3.1 in) |
| 1970 | 111.8 mm (4.4 in) |
| 1971 | 131.4 mm (5.2 in) |
| 1972 | 44.7 mm (1.8 in) |
| 1973 | 82.8 mm (3.3 in) |
| 1974 | 59.8 mm (2.4 in) |
| 1975 | 69.4 mm (2.7 in) |
| 1976 | 54.4 mm (2.1 in) |
| 1977 | 104.9 mm (4.1 in) |
| 1978 | 67.3 mm (2.6 in) |
| 1979 | 69.2 mm (2.7 in) |
| 1980 | 50.0 mm (2.0 in) |
| 1981 | 70.3 mm (2.8 in) |
| 1982 | 86.3 mm (3.4 in) |
| 1983 | 101.5 mm (4.0 in) |
| 1984 | 74.9 mm (2.9 in) |
| 1985 | 150.5 mm (5.9 in) |
| 1986 | 64.9 mm (2.6 in) |
| 1987 | 86.6 mm (3.4 in) |
| 1988 | 57.9 mm (2.3 in) |
| 1989 | 55.2 mm (2.2 in) |
| 1990 | 99.6 mm (3.9 in) |
| 1991 | 30.1 mm (1.2 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1952 | 166.0 mm (6.5 in) |
| 1953 | 246.2 mm (9.7 in) |
| 1954 | 250.2 mm (9.9 in) |
| 1955 | 98.5 mm (3.9 in) |
| 1956 | 164.9 mm (6.5 in) |
| 1957 | 180.8 mm (7.1 in) |
| 1958 | 131.5 mm (5.2 in) |
| 1959 | 87.0 mm (3.4 in) |
| 1960 | 274.6 mm (10.8 in) |
| 1961 | 126.8 mm (5.0 in) |
| 1962 | 145.8 mm (5.7 in) |
| 1963 | 271.2 mm (10.7 in) |
| 1964 | 196.1 mm (7.7 in) |
| 1965 | 135.6 mm (5.3 in) |
| 1966 | 131.0 mm (5.2 in) |
| 1967 | 134.6 mm (5.3 in) |
| 1968 | 98.5 mm (3.9 in) |
| 1969 | 134.5 mm (5.3 in) |
| 1970 | 159.0 mm (6.3 in) |
| 1971 | 202.4 mm (8.0 in) |
| 1972 | 65.1 mm (2.6 in) |
| 1973 | 209.5 mm (8.2 in) |
| 1974 | 129.6 mm (5.1 in) |
| 1975 | 177.0 mm (7.0 in) |
| 1976 | 65.5 mm (2.6 in) |
| 1977 | 139.3 mm (5.5 in) |
| 1978 | 95.6 mm (3.8 in) |
| 1979 | 117.2 mm (4.6 in) |
| 1980 | 75.2 mm (3.0 in) |
| 1981 | 111.1 mm (4.4 in) |
| 1982 | 217.4 mm (8.6 in) |
| 1983 | 146.6 mm (5.8 in) |
| 1984 | 145.1 mm (5.7 in) |
| 1985 | 192.4 mm (7.6 in) |
| 1986 | 168.1 mm (6.6 in) |
| 1987 | 123.5 mm (4.9 in) |
| 1988 | 125.3 mm (4.9 in) |
| 1989 | 102.2 mm (4.0 in) |
| 1990 | 177.7 mm (7.0 in) |
| 1991 | 52.7 mm (2.1 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1952 | 22 days |
| 1953 | 37 days |
| 1954 | 32 days |
| 1955 | 28 days |
| 1956 | 24 days |
| 1957 | 23 days |
| 1958 | 29 days |
| 1959 | 19 days |
| 1960 | 30 days |
| 1961 | 26 days |
| 1962 | 38 days |
| 1963 | 49 days |
| 1964 | 51 days |
| 1965 | 24 days |
| 1966 | 26 days |
| 1967 | 50 days |
| 1968 | 35 days |
| 1969 | 47 days |
| 1970 | 27 days |
| 1971 | 32 days |
| 1972 | 32 days |
| 1973 | 41 days |
| 1974 | 42 days |
| 1975 | 50 days |
| 1976 | 27 days |
| 1977 | 35 days |
| 1978 | 31 days |
| 1979 | 22 days |
| 1980 | 48 days |
| 1981 | 31 days |
| 1982 | 37 days |
| 1983 | 37 days |
| 1984 | 52 days |
| 1985 | 23 days |
| 1986 | 24 days |
| 1987 | 35 days |
| 1988 | 30 days |
| 1989 | 34 days |
| 1990 | 33 days |
| 1991 | 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
38 years with a frostAcross 38 years with a frost, the median last spring frost at Caohekou falls on 1 May and the median first autumn frost on 2 October, which leaves a median of 154 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 (1961 to 1990) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 1 May | n/a | 2 May | n/a | +0.8 days per decade |
| First autumn frost | 2 October | n/a | 2 October | n/a | -1.0 days per decade |
| Growing days | 154 days | n/a | 154 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
38 years, 1953 to 1990A day with at least 80.3 mm (3.2 in) of rain is expected about once in 2 years. A day with at least 193.6 mm (7.6 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 80.3 mm (3.2 in) | |
| 5 years | 106.5 mm (4.2 in) | |
| 10 years | 125.4 mm (4.9 in) | |
| 25 years | 151.2 mm (6.0 in) | |
| 50 years | 171.8 mm (6.8 in) | Longer than the 38 years of record |
| 100 years | 193.6 mm (7.6 in) | Longer than the 38 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, 38 years of values from 1953 to 1990.
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: 193.4 mm (7.6 in) in 1960; 150.5 mm (5.9 in) in 1985; 131.4 mm (5.2 in) in 1971.
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 (2025-12-31).