San Telmo Weather Records (MXN00002055)
Record envelope, standing records and threshold days for San Telmo (MXN00002055), Mexico, with 65 years of record.
Key Facts for San Telmo
- San Telmo (MXN00002055) is a weather station in Mexico at 30.95 latitude and -116.10 longitude, 60 m (196 ft) above sea level.
- The station reports from 1948 to 2012, 65 years of record.
- 1,464 records set at San Telmo still stand.
- Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
- San Telmo set a daily record high maximum temperature of 30.6 C (87.1 F) on 24 November 2012.
About the Station
- Location: Mexico, 30.95 latitude, -116.10 longitude.
- Elevation: 60 m (196 ft).
- Period of record: 1948 to 2012, 65 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 | 35.0 C (95.0 F) | -7.2 C (19.0 F) | n/a | n/a |
| Feb | 35.6 C (96.1 F) | -6.1 C (21.0 F) | n/a | n/a |
| Mar | 35.6 C (96.1 F) | -5.0 C (23.0 F) | n/a | n/a |
| Apr | 35.0 C (95.0 F) | -1.7 C (28.9 F) | n/a | n/a |
| May | 40.0 C (104.0 F) | 0.6 C (33.1 F) | n/a | n/a |
| Jun | 43.3 C (109.9 F) | 2.8 C (37.0 F) | n/a | n/a |
| Jul | 43.9 C (111.0 F) | 6.1 C (43.0 F) | n/a | n/a |
| Aug | 40.6 C (105.1 F) | 5.0 C (41.0 F) | n/a | n/a |
| Sep | 47.8 C (118.0 F) | 1.7 C (35.1 F) | n/a | n/a |
| Oct | 40.0 C (104.0 F) | -3.3 C (26.1 F) | n/a | n/a |
| Nov | 36.7 C (98.1 F) | -6.1 C (21.0 F) | n/a | n/a |
| Dec | 32.8 C (91.0 F) | -7.8 C (18.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1948 | 23 |
| 1949 | 59 |
| 1950 | 48 |
| 1951 | 21 |
| 1952 | 62 |
| 1953 | 69 |
| 1954 | 35 |
| 1955 | 53 |
| 1956 | 43 |
| 1957 | 42 |
| 1958 | 46 |
| 1959 | 48 |
| 1960 | 47 |
| 1961 | 23 |
| 1962 | 32 |
| 1963 | 25 |
| 1964 | 30 |
| 1965 | 40 |
| 1966 | 24 |
| 1967 | 29 |
| 1968 | 27 |
| 1969 | 23 |
| 1970 | 33 |
| 1971 | 43 |
| 1972 | 29 |
| 1973 | 26 |
| 1974 | 36 |
| 1975 | 21 |
| 1976 | 31 |
| 1977 | 28 |
| 1978 | 37 |
| 1979 | 42 |
| 1980 | 27 |
| 1981 | 39 |
| 1982 | 32 |
| 1983 | 35 |
| 1984 | 51 |
| 1985 | 19 |
| 1986 | 19 |
| 1988 | 2 |
| 1990 | 27 |
| 2011 | 11 |
| 2012 | 27 |
Wettest Day of Each Month
Sep: 82.8 mm (3.3 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 67.8 mm (2.7 in) | 16 January 1979 |
| Feb | 71.9 mm (2.8 in) | 28 February 1978 |
| Mar | 37.8 mm (1.5 in) | 10 March 1986 |
| Apr | 39.9 mm (1.6 in) | 2 April 1965 |
| May | 6.9 mm (0.27 in) | 8 May 1977 |
| Jun | 4.8 mm (0.19 in) | 8 June 1972 |
| Jul | 51.8 mm (2.0 in) | 17 July 1984 |
| Aug | 23.4 mm (0.9 in) | 16 August 1977 |
| Sep | 82.8 mm (3.3 in) | 17 September 1963 |
| Oct | 20.8 mm (0.8 in) | 9 October 1985 |
| Nov | 34.8 mm (1.4 in) | 30 November 1982 |
| Dec | 79.8 mm (3.1 in) | 27 December 1984 |
Period of Record Coverage
1948 to 2012| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1948 | 224 | 61% | No |
| 1949 | 365 | 100% | Yes |
| 1950 | 365 | 100% | Yes |
| 1951 | 364 | 100% | Yes |
| 1952 | 365 | 100% | Yes |
| 1953 | 365 | 100% | Yes |
| 1954 | 365 | 100% | Yes |
| 1955 | 364 | 100% | Yes |
| 1956 | 365 | 100% | Yes |
| 1957 | 364 | 100% | Yes |
| 1958 | 364 | 100% | Yes |
| 1959 | 364 | 100% | Yes |
| 1960 | 365 | 100% | Yes |
| 1961 | 360 | 99% | Yes |
| 1962 | 365 | 100% | Yes |
| 1963 | 365 | 100% | Yes |
| 1964 | 327 | 89% | No |
| 1965 | 351 | 96% | Yes |
| 1966 | 341 | 93% | Yes |
| 1967 | 340 | 93% | Yes |
| 1968 | 345 | 94% | Yes |
| 1969 | 304 | 83% | No |
| 1970 | 354 | 97% | Yes |
| 1971 | 355 | 97% | Yes |
| 1972 | 361 | 99% | Yes |
| 1973 | 365 | 100% | Yes |
| 1974 | 354 | 97% | Yes |
| 1975 | 365 | 100% | Yes |
| 1976 | 333 | 91% | Yes |
| 1977 | 364 | 100% | Yes |
| 1978 | 342 | 94% | Yes |
| 1979 | 357 | 98% | Yes |
| 1980 | 341 | 93% | Yes |
| 1981 | 365 | 100% | Yes |
| 1982 | 325 | 89% | No |
| 1983 | 318 | 87% | No |
| 1984 | 340 | 93% | Yes |
| 1985 | 301 | 82% | No |
| 1986 | 238 | 65% | No |
| 1988 | 7 | 2% | No |
| 1990 | 90 | 25% | No |
| 2011 | 148 | 41% | No |
| 2012 | 322 | 88% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 24 November 2012 | San Telmo, MX | daily high max | 30.6 C (87.1 F) | 1.2 C (2.2 F) | 55 years | 24 of 100 (Routine) |
| 10 November 2012 | San Telmo, MX | daily high min (Tie) | 13.9 C (57.0 F) | tie | 59 years | 5 of 100 (Routine) |
| 9 November 2012 | San Telmo, MX | daily high min | 15.0 C (59.0 F) | 3.3 C (5.9 F) | 45 years | 27 of 100 (Routine) |
| 8 November 2012 | San Telmo, MX | daily rain | 4.8 mm (0.19 in) | 2.0 mm (0.08 in) | 30 years | 17 of 100 (Routine) |
| 22 October 2012 | San Telmo, MX | daily high min (Tie) | 16.7 C (62.1 F) | tie | 56 years | 5 of 100 (Routine) |
| 20 October 2012 | San Telmo, MX | daily high min | 16.7 C (62.1 F) | 1.7 C (3.1 F) | 54 years | 26 of 100 (Routine) |
| 20 October 2012 | San Telmo, MX | daily high max | 35.6 C (96.1 F) | 1.7 C (3.1 F) | 29 years | 18 of 100 (Routine) |
| 19 October 2012 | San Telmo, MX | daily high max (Tie) | 35.6 C (96.1 F) | tie | 45 years | 4 of 100 (Routine) |
| 18 October 2012 | San Telmo, MX | daily high min | 17.8 C (64.0 F) | 2.8 C (5.0 F) | 40 years | 25 of 100 (Routine) |
| 9 October 2012 | San Telmo, MX | daily high min | 17.8 C (64.0 F) | 0.6 C (1.1 F) | 35 years | 17 of 100 (Routine) |
| 4 October 2012 | San Telmo, MX | daily high max | 35.6 C (96.1 F) | 1.7 C (3.1 F) | 54 years | 26 of 100 (Routine) |
| 3 October 2012 | San Telmo, MX | daily high max | 37.8 C (100.0 F) | 1.1 C (2.0 F) | 47 years | 22 of 100 (Routine) |
| 2 October 2012 | San Telmo, MX | daily high max | 37.8 C (100.0 F) | 0.6 C (1.1 F) | 47 years | 21 of 100 (Routine) |
| 1 October 2012 | San Telmo, MX | daily high max | 36.7 C (98.1 F) | 1.7 C (3.1 F) | 29 years | 18 of 100 (Routine) |
| 25 September 2012 | San Telmo, MX | daily low max | 20.0 C (68.0 F) | 1.1 C (2.0 F) | 38 years | 19 of 100 (Routine) |
| 19 September 2012 | San Telmo, MX | daily high min (Tie) | 18.9 C (66.0 F) | tie | 28 years | 3 of 100 (Routine) |
| 15 September 2012 | San Telmo, MX | daily high min (Tie) | 20.0 C (68.0 F) | tie | 53 years | 5 of 100 (Routine) |
| 14 September 2012 | San Telmo, MX | daily high min (Tie) | 20.0 C (68.0 F) | tie | 28 years | 3 of 100 (Routine) |
| 13 September 2012 | San Telmo, MX | daily high min (Tie) | 20.6 C (69.1 F) | tie | 29 years | 3 of 100 (Routine) |
| 8 September 2012 | San Telmo, MX | daily rain | 5.8 mm (0.23 in) | 0.5 mm (0.02 in) | 36 years | 16 of 100 (Routine) |
Climate Trend
32 complete years, 1949 to 1985| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1949 | 15.8 C | -0.41 C |
| 1950 | 16.2 C | +0.00 C |
| 1951 | 15.7 C | -0.54 C |
| 1952 | 15.1 C | -1.16 C |
| 1953 | 16.2 C | +0.01 C |
| 1954 | 16.1 C | -0.13 C |
| 1955 | 15.1 C | -1.12 C |
| 1956 | 15.6 C | -0.61 C |
| 1957 | 16.2 C | +0.00 C |
| 1958 | 17.1 C | +0.83 C |
| 1959 | 17.3 C | +1.09 C |
| 1960 | 16.3 C | +0.05 C |
| 1961 | 16.0 C | -0.19 C |
| 1962 | 15.5 C | -0.70 C |
| 1963 | 16.5 C | +0.25 C |
| 1965 | 15.7 C | -0.54 C |
| 1966 | 16.2 C | -0.08 C |
| 1967 | 16.2 C | -0.03 C |
| 1968 | 16.1 C | -0.11 C |
| 1970 | 15.8 C | -0.47 C |
| 1971 | 15.2 C | -1.00 C |
| 1972 | 16.1 C | -0.10 C |
| 1973 | 15.7 C | -0.50 C |
| 1974 | 15.6 C | -0.66 C |
| 1975 | 15.2 C | -1.05 C |
| 1977 | 17.1 C | +0.89 C |
| 1979 | 16.9 C | +0.64 C |
| 1980 | 17.4 C | +1.13 C |
| 1981 | 17.8 C | +1.52 C |
| 1982 | 16.6 C | +0.40 C |
| 1984 | 17.8 C | +1.59 C |
| 1985 | 17.1 C | +0.88 C |
The annual mean temperature here has risen by 0.3 C (0.1 to 0.6) per decade over 1949 to 1985. In Fahrenheit: 0.6 F (0.2 to 1.0) per decade. The slope is a straight line fitted to 32 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 0.6) per decade | 0.6 F (0.2 to 1.0) per decade | 1949 to 1985 | 32 | Rise |
| Mean daily maximum | 0.5 C (0.2 to 0.8) per decade | 0.9 F (0.3 to 1.4) per decade | 1949 to 1985 | 32 | Rise |
| Mean daily minimum | 0.2 C (-0.1 to 0.4) per decade | 0.3 F (-0.1 to 0.7) per decade | 1949 to 1985 | 32 | 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
1948 to 2012| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 47.8 C (118.0 F) | 1958 | 37.8 C (100.0 F) | 43 |
| Coldest night (TNn) | -7.8 C (18.0 F) | 1954 | -4.4 C (24.1 F) | 43 |
| Wettest day (Rx1day) | 82.8 mm (3.3 in) | 1963 | 24.9 mm (1.0 in) | 43 |
| Wettest five days (Rx5day) | 129.0 mm (5.1 in) | 1978 | 40.7 mm (1.6 in) | 43 |
| Longest dry spell (CDD) | 268 days | 1962 | 104 days | 43 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1948 | 37.8 C (100.0 F) |
| 1949 | 36.7 C (98.1 F) |
| 1950 | 40.0 C (104.0 F) |
| 1951 | 37.8 C (100.0 F) |
| 1952 | 36.7 C (98.1 F) |
| 1953 | 40.0 C (104.0 F) |
| 1954 | 36.7 C (98.1 F) |
| 1955 | 40.0 C (104.0 F) |
| 1956 | 38.9 C (102.0 F) |
| 1957 | 35.0 C (95.0 F) |
| 1958 | 47.8 C (118.0 F) |
| 1959 | 37.8 C (100.0 F) |
| 1960 | 37.2 C (99.0 F) |
| 1961 | 37.2 C (99.0 F) |
| 1962 | 35.6 C (96.1 F) |
| 1963 | 41.1 C (106.0 F) |
| 1964 | 35.6 C (96.1 F) |
| 1965 | 37.2 C (99.0 F) |
| 1966 | 35.6 C (96.1 F) |
| 1967 | 40.0 C (104.0 F) |
| 1968 | 39.4 C (102.9 F) |
| 1969 | 35.0 C (95.0 F) |
| 1970 | 38.9 C (102.0 F) |
| 1971 | 38.3 C (100.9 F) |
| 1972 | 40.0 C (104.0 F) |
| 1973 | 40.0 C (104.0 F) |
| 1974 | 37.8 C (100.0 F) |
| 1975 | 37.8 C (100.0 F) |
| 1976 | 37.2 C (99.0 F) |
| 1977 | 40.0 C (104.0 F) |
| 1978 | 43.3 C (109.9 F) |
| 1979 | 41.7 C (107.1 F) |
| 1980 | 39.4 C (102.9 F) |
| 1981 | 40.6 C (105.1 F) |
| 1982 | 37.8 C (100.0 F) |
| 1983 | 40.0 C (104.0 F) |
| 1984 | 40.0 C (104.0 F) |
| 1985 | 43.9 C (111.0 F) |
| 1986 | 35.6 C (96.1 F) |
| 1988 | 30.6 C (87.1 F) |
| 1990 | 28.9 C (84.0 F) |
| 2011 | 38.9 C (102.0 F) |
| 2012 | 37.8 C (100.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1948 | -5.0 C (23.0 F) |
| 1949 | -5.0 C (23.0 F) |
| 1950 | -5.0 C (23.0 F) |
| 1951 | -5.0 C (23.0 F) |
| 1952 | -1.1 C (30.0 F) |
| 1953 | -5.0 C (23.0 F) |
| 1954 | -7.8 C (18.0 F) |
| 1955 | -5.0 C (23.0 F) |
| 1956 | -5.0 C (23.0 F) |
| 1957 | -5.0 C (23.0 F) |
| 1958 | -6.1 C (21.0 F) |
| 1959 | -5.0 C (23.0 F) |
| 1960 | -6.1 C (21.0 F) |
| 1961 | -5.0 C (23.0 F) |
| 1962 | -4.4 C (24.1 F) |
| 1963 | -3.3 C (26.1 F) |
| 1964 | -5.0 C (23.0 F) |
| 1965 | -2.2 C (28.0 F) |
| 1966 | -5.6 C (21.9 F) |
| 1967 | -3.9 C (25.0 F) |
| 1968 | -4.4 C (24.1 F) |
| 1969 | -5.0 C (23.0 F) |
| 1970 | -7.2 C (19.0 F) |
| 1971 | -5.6 C (21.9 F) |
| 1972 | -5.0 C (23.0 F) |
| 1973 | -2.2 C (28.0 F) |
| 1974 | -6.1 C (21.0 F) |
| 1975 | -4.4 C (24.1 F) |
| 1976 | -1.1 C (30.0 F) |
| 1977 | -2.2 C (28.0 F) |
| 1978 | -2.2 C (28.0 F) |
| 1979 | -6.1 C (21.0 F) |
| 1980 | -2.2 C (28.0 F) |
| 1981 | -3.3 C (26.1 F) |
| 1982 | 0.0 C (32.0 F) |
| 1983 | 0.0 C (32.0 F) |
| 1984 | -1.1 C (30.0 F) |
| 1985 | -3.3 C (26.1 F) |
| 1986 | -1.1 C (30.0 F) |
| 1988 | 7.8 C (46.0 F) |
| 1990 | 0.0 C (32.0 F) |
| 2011 | 0.0 C (32.0 F) |
| 2012 | 0.0 C (32.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1948 | 17.3 mm (0.7 in) |
| 1949 | 52.8 mm (2.1 in) |
| 1950 | 12.2 mm (0.5 in) |
| 1951 | 26.4 mm (1.0 in) |
| 1952 | 29.0 mm (1.1 in) |
| 1953 | 18.3 mm (0.7 in) |
| 1954 | 30.5 mm (1.2 in) |
| 1955 | 15.7 mm (0.6 in) |
| 1956 | 7.6 mm (0.30 in) |
| 1957 | 25.7 mm (1.0 in) |
| 1958 | 20.3 mm (0.8 in) |
| 1959 | 21.3 mm (0.8 in) |
| 1960 | 25.4 mm (1.0 in) |
| 1961 | 16.3 mm (0.6 in) |
| 1962 | 32.8 mm (1.3 in) |
| 1963 | 82.8 mm (3.3 in) |
| 1964 | 27.9 mm (1.1 in) |
| 1965 | 39.9 mm (1.6 in) |
| 1966 | 22.1 mm (0.9 in) |
| 1967 | 24.9 mm (1.0 in) |
| 1968 | 20.8 mm (0.8 in) |
| 1969 | 22.9 mm (0.9 in) |
| 1970 | 23.9 mm (0.9 in) |
| 1971 | 16.3 mm (0.6 in) |
| 1972 | 24.4 mm (1.0 in) |
| 1973 | 16.8 mm (0.7 in) |
| 1974 | 25.9 mm (1.0 in) |
| 1975 | 19.8 mm (0.8 in) |
| 1976 | 45.0 mm (1.8 in) |
| 1977 | 54.9 mm (2.2 in) |
| 1978 | 71.9 mm (2.8 in) |
| 1979 | 67.8 mm (2.7 in) |
| 1980 | 52.3 mm (2.1 in) |
| 1981 | 22.9 mm (0.9 in) |
| 1982 | 34.8 mm (1.4 in) |
| 1983 | 34.3 mm (1.4 in) |
| 1984 | 79.8 mm (3.1 in) |
| 1985 | 21.3 mm (0.8 in) |
| 1986 | 37.8 mm (1.5 in) |
| 1988 | 0.0 mm (0.00 in) |
| 1990 | 15.7 mm (0.6 in) |
| 2011 | 27.9 mm (1.1 in) |
| 2012 | 17.8 mm (0.7 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1948 | 22.7 mm (0.9 in) |
| 1949 | 82.4 mm (3.2 in) |
| 1950 | 14.0 mm (0.6 in) |
| 1951 | 40.7 mm (1.6 in) |
| 1952 | 39.0 mm (1.5 in) |
| 1953 | 26.0 mm (1.0 in) |
| 1954 | 56.1 mm (2.2 in) |
| 1955 | 40.9 mm (1.6 in) |
| 1956 | 10.9 mm (0.4 in) |
| 1957 | 52.1 mm (2.1 in) |
| 1958 | 23.9 mm (0.9 in) |
| 1959 | 51.1 mm (2.0 in) |
| 1960 | 45.2 mm (1.8 in) |
| 1961 | 35.1 mm (1.4 in) |
| 1962 | 32.8 mm (1.3 in) |
| 1963 | 87.6 mm (3.4 in) |
| 1964 | 34.4 mm (1.4 in) |
| 1965 | 83.4 mm (3.3 in) |
| 1966 | 33.5 mm (1.3 in) |
| 1967 | 35.6 mm (1.4 in) |
| 1968 | 25.6 mm (1.0 in) |
| 1969 | 40.7 mm (1.6 in) |
| 1970 | 41.7 mm (1.6 in) |
| 1971 | 34.8 mm (1.4 in) |
| 1972 | 47.0 mm (1.9 in) |
| 1973 | 36.1 mm (1.4 in) |
| 1974 | 41.5 mm (1.6 in) |
| 1975 | 39.2 mm (1.5 in) |
| 1976 | 100.1 mm (3.9 in) |
| 1977 | 93.2 mm (3.7 in) |
| 1978 | 129.0 mm (5.1 in) |
| 1979 | 85.4 mm (3.4 in) |
| 1980 | 91.6 mm (3.6 in) |
| 1981 | 71.4 mm (2.8 in) |
| 1982 | 45.4 mm (1.8 in) |
| 1983 | 61.0 mm (2.4 in) |
| 1984 | 104.5 mm (4.1 in) |
| 1985 | 23.1 mm (0.9 in) |
| 1986 | 46.5 mm (1.8 in) |
| 1988 | 0.0 mm (0.00 in) |
| 1990 | 15.7 mm (0.6 in) |
| 2011 | 39.5 mm (1.6 in) |
| 2012 | 20.9 mm (0.8 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1948 | 214 days |
| 1949 | 195 days |
| 1950 | 104 days |
| 1951 | 101 days |
| 1952 | 195 days |
| 1953 | 126 days |
| 1954 | 159 days |
| 1955 | 244 days |
| 1956 | 157 days |
| 1957 | 98 days |
| 1958 | 126 days |
| 1959 | 159 days |
| 1960 | 89 days |
| 1961 | 95 days |
| 1962 | 268 days |
| 1963 | 130 days |
| 1964 | 75 days |
| 1965 | 66 days |
| 1966 | 90 days |
| 1967 | 104 days |
| 1968 | 94 days |
| 1969 | 159 days |
| 1970 | 202 days |
| 1971 | 87 days |
| 1972 | 139 days |
| 1973 | 188 days |
| 1974 | 98 days |
| 1975 | 184 days |
| 1976 | 114 days |
| 1977 | 93 days |
| 1978 | 118 days |
| 1979 | 130 days |
| 1980 | 78 days |
| 1981 | 167 days |
| 1982 | 40 days |
| 1983 | 93 days |
| 1984 | 79 days |
| 1985 | 29 days |
| 1986 | 55 days |
| 1988 | 31 days |
| 1990 | 29 days |
| 2011 | 65 days |
| 2012 | 135 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 San Telmo falls on 18 March and the median first autumn frost on 21 November, which leaves a median of 247 days between them.
Fitted over all years, the growing season changes by +5.1 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1949 to 1985) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 18 March | n/a | 18 March | n/a | -6.2 days per decade |
| First autumn frost | 21 November | n/a | 21 November | n/a | -1.1 days per decade |
| Growing days | 247 days | n/a | 247 days | n/a | +5.1 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
36 years, 1949 to 2012A day with at least 26.6 mm (1.0 in) of rain is expected about once in 2 years. A day with at least 116.4 mm (4.6 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 26.6 mm (1.0 in) | |
| 5 years | 42.0 mm (1.7 in) | |
| 10 years | 54.9 mm (2.2 in) | |
| 25 years | 75.4 mm (3.0 in) | |
| 50 years | 94.1 mm (3.7 in) | Longer than the 36 years of record |
| 100 years | 116.4 mm (4.6 in) | Longer than the 36 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, 36 years of values from 1949 to 2012.
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: 82.8 mm (3.3 in) in 1963; 79.8 mm (3.1 in) in 1984; 71.9 mm (2.8 in) in 1978.
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).