Polotitlan Weather Records (MXN00015069)
Record envelope, standing records and threshold days for Polotitlan (MXN00015069), Mexico, with 48 years of record.
Key Facts for Polotitlan
- Polotitlan (MXN00015069) is a weather station in Mexico at 20.22 latitude and -99.83 longitude, 2,280 m (7,480 ft) above sea level.
- The station reports from 1961 to 2008, 48 years of record.
- 1,464 records set at Polotitlan still stand.
- Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
- Polotitlan tied a daily record low maximum temperature of 13.9 C (57.0 F) on 26 November 2008.
About the Station
- Location: Mexico, 20.22 latitude, -99.83 longitude.
- Elevation: 2,280 m (7,480 ft).
- Period of record: 1961 to 2008, 48 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 | 26.1 C (79.0 F) | -4.4 C (24.1 F) | n/a | n/a |
| Feb | 28.3 C (82.9 F) | -6.1 C (21.0 F) | n/a | n/a |
| Mar | 30.6 C (87.1 F) | -1.1 C (30.0 F) | n/a | n/a |
| Apr | 33.3 C (91.9 F) | 0.0 C (32.0 F) | n/a | n/a |
| May | 35.0 C (95.0 F) | 2.8 C (37.0 F) | n/a | n/a |
| Jun | 33.9 C (93.0 F) | 2.8 C (37.0 F) | n/a | n/a |
| Jul | 30.6 C (87.1 F) | 3.9 C (39.0 F) | n/a | n/a |
| Aug | 30.0 C (86.0 F) | 3.9 C (39.0 F) | n/a | n/a |
| Sep | 28.9 C (84.0 F) | 0.0 C (32.0 F) | n/a | n/a |
| Oct | 27.2 C (81.0 F) | -2.2 C (28.0 F) | n/a | n/a |
| Nov | 26.7 C (80.1 F) | -4.4 C (24.1 F) | n/a | n/a |
| Dec | 26.7 C (80.1 F) | -7.2 C (19.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1961 | 68 |
| 1962 | 39 |
| 1963 | 41 |
| 1964 | 39 |
| 1965 | 26 |
| 1966 | 42 |
| 1967 | 29 |
| 1968 | 22 |
| 1969 | 24 |
| 1970 | 44 |
| 1971 | 44 |
| 1972 | 26 |
| 1973 | 23 |
| 1974 | 20 |
| 1975 | 24 |
| 1976 | 30 |
| 1977 | 22 |
| 1978 | 16 |
| 1979 | 38 |
| 1980 | 67 |
| 1981 | 27 |
| 1982 | 69 |
| 1983 | 66 |
| 1984 | 29 |
| 1985 | 25 |
| 1986 | 37 |
| 1987 | 57 |
| 1988 | 35 |
| 1989 | 29 |
| 1990 | 27 |
| 1991 | 37 |
| 1992 | 27 |
| 1993 | 19 |
| 1994 | 10 |
| 1995 | 19 |
| 1996 | 23 |
| 1997 | 54 |
| 1998 | 24 |
| 1999 | 61 |
| 2000 | 47 |
| 2008 | 58 |
All-Time Record Progression
1 new records| Date | Kind | Detail |
|---|---|---|
| 1997-12-14 | Record low minimum temperature | Record low minimum temperature -7.2 C (19.0 F) |
Wettest Day of Each Month
Sep: 133.9 mm (5.3 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 40.9 mm (1.6 in) | 13 January 1993 |
| Feb | 47.0 mm (1.9 in) | 11 February 2008 |
| Mar | 21.8 mm (0.9 in) | 21 March 1997 |
| Apr | 53.8 mm (2.1 in) | 6 April 1979 |
| May | 52.8 mm (2.1 in) | 25 May 1995 |
| Jun | 103.9 mm (4.1 in) | 11 June 1971 |
| Jul | 69.9 mm (2.8 in) | 15 July 1983 |
| Aug | 78.0 mm (3.1 in) | 2 August 1974 |
| Sep | 133.9 mm (5.3 in) | 27 September 1970 |
| Oct | 84.8 mm (3.3 in) | 6 October 1998 |
| Nov | 29.0 mm (1.1 in) | 1 November 1977 |
| Dec | 23.9 mm (0.9 in) | 2 December 1984 |
Period of Record Coverage
1961 to 2008| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1961 | 365 | 100% | Yes |
| 1962 | 335 | 92% | Yes |
| 1963 | 365 | 100% | Yes |
| 1964 | 336 | 92% | Yes |
| 1965 | 365 | 100% | Yes |
| 1966 | 365 | 100% | Yes |
| 1967 | 365 | 100% | Yes |
| 1968 | 366 | 100% | Yes |
| 1969 | 304 | 83% | No |
| 1970 | 365 | 100% | Yes |
| 1971 | 365 | 100% | Yes |
| 1972 | 274 | 75% | No |
| 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 | 364 | 100% | Yes |
| 1980 | 336 | 92% | 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 | 364 | 100% | Yes |
| 1988 | 363 | 99% | Yes |
| 1989 | 363 | 99% | Yes |
| 1990 | 365 | 100% | Yes |
| 1991 | 365 | 100% | Yes |
| 1992 | 366 | 100% | Yes |
| 1993 | 362 | 99% | Yes |
| 1994 | 269 | 74% | No |
| 1995 | 364 | 100% | Yes |
| 1996 | 364 | 99% | Yes |
| 1997 | 356 | 98% | Yes |
| 1998 | 353 | 97% | Yes |
| 1999 | 361 | 99% | Yes |
| 2000 | 331 | 90% | Yes |
| 2008 | 334 | 91% | Yes |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 26 November 2008 | Polotitlan, MX | daily low max (Tie) | 13.9 C (57.0 F) | tie | 10 years | 1 of 100 (Routine) |
| 24 November 2008 | Polotitlan, MX | daily low min | 0.0 C (32.0 F) | 0.6 C (1.1 F) | 43 years | 18 of 100 (Routine) |
| 23 November 2008 | Polotitlan, MX | daily low max | 12.8 C (55.0 F) | 2.8 C (5.0 F) | 44 years | 26 of 100 (Routine) |
| 22 November 2008 | Polotitlan, MX | daily low max (Tie) | 10.0 C (50.0 F) | tie | 32 years | 3 of 100 (Routine) |
| 22 November 2008 | Polotitlan, MX | daily low min (Tie) | 0.0 C (32.0 F) | tie | 17 years | 2 of 100 (Routine) |
| 21 November 2008 | Polotitlan, MX | daily low max | 13.9 C (57.0 F) | 1.1 C (2.0 F) | 32 years | 16 of 100 (Routine) |
| 21 November 2008 | Polotitlan, MX | daily low min | -1.1 C (30.0 F) | 1.1 C (2.0 F) | 17 years | 13 of 100 (Routine) |
| 20 November 2008 | Polotitlan, MX | daily low min | -3.3 C (26.1 F) | 5.0 C (9.0 F) | 43 years | 36 of 100 (Notable) |
| 20 November 2008 | Polotitlan, MX | daily low max | 12.8 C (55.0 F) | 2.2 C (4.0 F) | 8 years | 13 of 100 (Routine) |
| 19 November 2008 | Polotitlan, MX | daily low min | -3.3 C (26.1 F) | 5.0 C (9.0 F) | 43 years | 36 of 100 (Notable) |
| 19 November 2008 | Polotitlan, MX | daily low max | 11.7 C (53.1 F) | 1.1 C (2.0 F) | 13 years | 10 of 100 (Routine) |
| 18 November 2008 | Polotitlan, MX | monthly low min | -4.4 C (24.1 F) | 0.5 C (0.9 F) | 33 years | 26 of 100 (Routine) |
| 18 November 2008 | Polotitlan, MX | daily low max (Tie) | 13.9 C (57.0 F) | tie | 13 years | 1 of 100 (Routine) |
| 17 November 2008 | Polotitlan, MX | daily low min | -3.3 C (26.1 F) | 2.2 C (4.0 F) | 38 years | 24 of 100 (Routine) |
| 3 November 2008 | Polotitlan, MX | daily low max (Tie) | 15.6 C (60.1 F) | tie | 37 years | 3 of 100 (Routine) |
| 30 October 2008 | Polotitlan, MX | daily low max | 15.0 C (59.0 F) | 0.6 C (1.1 F) | 33 years | 15 of 100 (Routine) |
| 29 October 2008 | Polotitlan, MX | daily low min | 0.0 C (32.0 F) | 1.1 C (2.0 F) | 40 years | 20 of 100 (Routine) |
| 28 October 2008 | Polotitlan, MX | daily low min | 0.6 C (33.1 F) | 1.1 C (2.0 F) | 43 years | 20 of 100 (Routine) |
| 28 October 2008 | Polotitlan, MX | monthly low max (Tie) | 10.0 C (50.0 F) | tie | 43 years | 6 of 100 (Routine) |
| 22 October 2008 | Polotitlan, MX | daily low min (Tie) | 0.6 C (33.1 F) | tie | 43 years | 4 of 100 (Routine) |
Climate Trend
33 complete years, 1961 to 1999| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1961 | 15.0 C | +0.58 C |
| 1963 | 14.6 C | +0.18 C |
| 1965 | 14.2 C | -0.21 C |
| 1966 | 14.0 C | -0.42 C |
| 1967 | 14.3 C | -0.08 C |
| 1968 | 14.2 C | -0.19 C |
| 1970 | 14.6 C | +0.20 C |
| 1971 | 14.9 C | +0.51 C |
| 1973 | 14.4 C | +0.02 C |
| 1974 | 13.9 C | -0.51 C |
| 1975 | 14.0 C | -0.34 C |
| 1976 | 13.9 C | -0.51 C |
| 1977 | 14.4 C | +0.00 C |
| 1978 | 14.4 C | +0.00 C |
| 1979 | 14.2 C | -0.14 C |
| 1981 | 14.8 C | +0.42 C |
| 1982 | 15.8 C | +1.39 C |
| 1983 | 15.5 C | +1.09 C |
| 1984 | 15.1 C | +0.71 C |
| 1985 | 15.1 C | +0.76 C |
| 1986 | 15.4 C | +0.98 C |
| 1987 | 15.5 C | +1.08 C |
| 1988 | 15.2 C | +0.81 C |
| 1989 | 14.8 C | +0.41 C |
| 1990 | 14.6 C | +0.21 C |
| 1991 | 14.6 C | +0.22 C |
| 1992 | 13.5 C | -0.91 C |
| 1993 | 13.8 C | -0.56 C |
| 1995 | 14.0 C | -0.34 C |
| 1996 | 13.4 C | -0.96 C |
| 1997 | 13.2 C | -1.13 C |
| 1998 | 13.3 C | -1.08 C |
| 1999 | 12.1 C | -2.24 C |
The fitted trend in annual mean temperature here over 1961 to 1999 is -0.20 C (-0.44 to 0.04) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.4 F (-0.8 to 0.1) 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 | -0.20 C (-0.44 to 0.04) per decade | -0.4 F (-0.8 to 0.1) per decade | 1961 to 1999 | 33 | Not clearly different from zero |
| Mean daily maximum | -0.2 C (-0.5 to 0.1) per decade | -0.4 F (-0.8 to 0.1) per decade | 1961 to 1999 | 33 | Not clearly different from zero |
| Mean daily minimum | -0.20 C (-0.45 to 0.05) per decade | -0.4 F (-0.8 to 0.1) per decade | 1961 to 1999 | 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
1961 to 2008| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 35.0 C (95.0 F) | 1980 | 30.6 C (87.1 F) | 41 |
| Coldest night (TNn) | -7.2 C (19.0 F) | 1997 | -1.1 C (30.0 F) | 41 |
| Wettest day (Rx1day) | 133.9 mm (5.3 in) | 1970 | 51.8 mm (2.0 in) | 41 |
| Wettest five days (Rx5day) | 203.4 mm (8.0 in) | 1971 | 91.8 mm (3.6 in) | 41 |
| Longest dry spell (CDD) | 114 days | 1996 | 57 days | 41 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1961 | 31.7 C (89.1 F) |
| 1962 | 30.0 C (86.0 F) |
| 1963 | 30.0 C (86.0 F) |
| 1964 | 30.6 C (87.1 F) |
| 1965 | 30.6 C (87.1 F) |
| 1966 | 30.6 C (87.1 F) |
| 1967 | 30.6 C (87.1 F) |
| 1968 | 30.0 C (86.0 F) |
| 1969 | 30.6 C (87.1 F) |
| 1970 | 31.7 C (89.1 F) |
| 1971 | 33.3 C (91.9 F) |
| 1972 | 30.6 C (87.1 F) |
| 1973 | 30.0 C (86.0 F) |
| 1974 | 28.9 C (84.0 F) |
| 1975 | 28.9 C (84.0 F) |
| 1976 | 28.3 C (82.9 F) |
| 1977 | 28.3 C (82.9 F) |
| 1978 | 30.0 C (86.0 F) |
| 1979 | 32.2 C (90.0 F) |
| 1980 | 35.0 C (95.0 F) |
| 1981 | 31.1 C (88.0 F) |
| 1982 | 30.0 C (86.0 F) |
| 1983 | 32.2 C (90.0 F) |
| 1984 | 30.6 C (87.1 F) |
| 1985 | 30.6 C (87.1 F) |
| 1986 | 30.6 C (87.1 F) |
| 1987 | 30.0 C (86.0 F) |
| 1988 | 31.7 C (89.1 F) |
| 1989 | 31.7 C (89.1 F) |
| 1990 | 31.7 C (89.1 F) |
| 1991 | 31.1 C (88.0 F) |
| 1992 | 27.8 C (82.0 F) |
| 1993 | 31.7 C (89.1 F) |
| 1994 | 30.6 C (87.1 F) |
| 1995 | 30.0 C (86.0 F) |
| 1996 | 31.1 C (88.0 F) |
| 1997 | 33.9 C (93.0 F) |
| 1998 | 30.0 C (86.0 F) |
| 1999 | 29.4 C (84.9 F) |
| 2000 | 26.7 C (80.1 F) |
| 2008 | 27.8 C (82.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1961 | -3.3 C (26.1 F) |
| 1962 | -2.8 C (27.0 F) |
| 1963 | -4.4 C (24.1 F) |
| 1964 | -0.6 C (30.9 F) |
| 1965 | -0.6 C (30.9 F) |
| 1966 | -4.4 C (24.1 F) |
| 1967 | -3.9 C (25.0 F) |
| 1968 | -0.6 C (30.9 F) |
| 1969 | -0.6 C (30.9 F) |
| 1970 | -1.1 C (30.0 F) |
| 1971 | -1.1 C (30.0 F) |
| 1972 | -2.2 C (28.0 F) |
| 1973 | -3.3 C (26.1 F) |
| 1974 | -3.9 C (25.0 F) |
| 1975 | -2.2 C (28.0 F) |
| 1976 | -1.1 C (30.0 F) |
| 1977 | 0.0 C (32.0 F) |
| 1978 | 0.0 C (32.0 F) |
| 1979 | -1.1 C (30.0 F) |
| 1980 | -1.1 C (30.0 F) |
| 1981 | -2.2 C (28.0 F) |
| 1982 | 0.0 C (32.0 F) |
| 1983 | -0.6 C (30.9 F) |
| 1984 | 0.0 C (32.0 F) |
| 1985 | 0.6 C (33.1 F) |
| 1986 | 0.0 C (32.0 F) |
| 1987 | 0.0 C (32.0 F) |
| 1988 | 0.0 C (32.0 F) |
| 1989 | 0.0 C (32.0 F) |
| 1990 | 0.0 C (32.0 F) |
| 1991 | 0.0 C (32.0 F) |
| 1992 | 0.0 C (32.0 F) |
| 1993 | 0.0 C (32.0 F) |
| 1994 | 0.0 C (32.0 F) |
| 1995 | -1.7 C (28.9 F) |
| 1996 | 0.0 C (32.0 F) |
| 1997 | -7.2 C (19.0 F) |
| 1998 | -3.3 C (26.1 F) |
| 1999 | -6.1 C (21.0 F) |
| 2000 | -3.9 C (25.0 F) |
| 2008 | -4.4 C (24.1 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1961 | 33.8 mm (1.3 in) |
| 1962 | 42.9 mm (1.7 in) |
| 1963 | 51.8 mm (2.0 in) |
| 1964 | 38.9 mm (1.5 in) |
| 1965 | 67.8 mm (2.7 in) |
| 1966 | 61.0 mm (2.4 in) |
| 1967 | 45.0 mm (1.8 in) |
| 1968 | 48.8 mm (1.9 in) |
| 1969 | 63.8 mm (2.5 in) |
| 1970 | 133.9 mm (5.3 in) |
| 1971 | 103.9 mm (4.1 in) |
| 1972 | 50.8 mm (2.0 in) |
| 1973 | 55.9 mm (2.2 in) |
| 1974 | 78.0 mm (3.1 in) |
| 1975 | 46.0 mm (1.8 in) |
| 1976 | 46.0 mm (1.8 in) |
| 1977 | 63.0 mm (2.5 in) |
| 1978 | 31.0 mm (1.2 in) |
| 1979 | 53.8 mm (2.1 in) |
| 1980 | 37.8 mm (1.5 in) |
| 1981 | 63.8 mm (2.5 in) |
| 1982 | 32.8 mm (1.3 in) |
| 1983 | 69.9 mm (2.8 in) |
| 1984 | 61.0 mm (2.4 in) |
| 1985 | 89.9 mm (3.5 in) |
| 1986 | 27.9 mm (1.1 in) |
| 1987 | 61.0 mm (2.4 in) |
| 1988 | 35.8 mm (1.4 in) |
| 1989 | 34.8 mm (1.4 in) |
| 1990 | 51.8 mm (2.0 in) |
| 1991 | 41.9 mm (1.6 in) |
| 1992 | 35.8 mm (1.4 in) |
| 1993 | 61.0 mm (2.4 in) |
| 1994 | 37.8 mm (1.5 in) |
| 1995 | 52.8 mm (2.1 in) |
| 1996 | 54.9 mm (2.2 in) |
| 1997 | 38.9 mm (1.5 in) |
| 1998 | 84.8 mm (3.3 in) |
| 1999 | 42.9 mm (1.7 in) |
| 2000 | 62.0 mm (2.4 in) |
| 2008 | 47.8 mm (1.9 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1961 | 89.4 mm (3.5 in) |
| 1962 | 100.8 mm (4.0 in) |
| 1963 | 120.4 mm (4.7 in) |
| 1964 | 56.3 mm (2.2 in) |
| 1965 | 102.3 mm (4.0 in) |
| 1966 | 146.3 mm (5.8 in) |
| 1967 | 71.3 mm (2.8 in) |
| 1968 | 110.6 mm (4.4 in) |
| 1969 | 120.0 mm (4.7 in) |
| 1970 | 163.1 mm (6.4 in) |
| 1971 | 203.4 mm (8.0 in) |
| 1972 | 83.1 mm (3.3 in) |
| 1973 | 83.4 mm (3.3 in) |
| 1974 | 100.2 mm (3.9 in) |
| 1975 | 93.5 mm (3.7 in) |
| 1976 | 140.3 mm (5.5 in) |
| 1977 | 106.7 mm (4.2 in) |
| 1978 | 62.5 mm (2.5 in) |
| 1979 | 77.7 mm (3.1 in) |
| 1980 | 65.2 mm (2.6 in) |
| 1981 | 77.4 mm (3.0 in) |
| 1982 | 61.4 mm (2.4 in) |
| 1983 | 152.4 mm (6.0 in) |
| 1984 | 82.3 mm (3.2 in) |
| 1985 | 108.4 mm (4.3 in) |
| 1986 | 80.2 mm (3.2 in) |
| 1987 | 68.3 mm (2.7 in) |
| 1988 | 92.5 mm (3.6 in) |
| 1989 | 74.5 mm (2.9 in) |
| 1990 | 90.4 mm (3.6 in) |
| 1991 | 126.1 mm (5.0 in) |
| 1992 | 90.1 mm (3.5 in) |
| 1993 | 75.7 mm (3.0 in) |
| 1994 | 101.4 mm (4.0 in) |
| 1995 | 95.3 mm (3.8 in) |
| 1996 | 76.8 mm (3.0 in) |
| 1997 | 79.2 mm (3.1 in) |
| 1998 | 111.7 mm (4.4 in) |
| 1999 | 70.3 mm (2.8 in) |
| 2000 | 91.8 mm (3.6 in) |
| 2008 | 136.4 mm (5.4 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1961 | 94 days |
| 1962 | 77 days |
| 1963 | 73 days |
| 1964 | 43 days |
| 1965 | 45 days |
| 1966 | 34 days |
| 1967 | 43 days |
| 1968 | 39 days |
| 1969 | 59 days |
| 1970 | 57 days |
| 1971 | 67 days |
| 1972 | 30 days |
| 1973 | 102 days |
| 1974 | 57 days |
| 1975 | 88 days |
| 1976 | 70 days |
| 1977 | 49 days |
| 1978 | 25 days |
| 1979 | 53 days |
| 1980 | 38 days |
| 1981 | 34 days |
| 1982 | 43 days |
| 1983 | 68 days |
| 1984 | 57 days |
| 1985 | 71 days |
| 1986 | 53 days |
| 1987 | 76 days |
| 1988 | 77 days |
| 1989 | 39 days |
| 1990 | 42 days |
| 1991 | 89 days |
| 1992 | 46 days |
| 1993 | 54 days |
| 1994 | 52 days |
| 1995 | 55 days |
| 1996 | 114 days |
| 1997 | 51 days |
| 1998 | 98 days |
| 1999 | 77 days |
| 2000 | 64 days |
| 2008 | 61 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
25 years with a frostAcross 25 years with a frost, the median last spring frost at Polotitlan falls on 28 February and the median first autumn frost on 15 November, which leaves a median of 259 days between them.
Fitted over all years, the growing season changes by -5.0 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1961 to 1999) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 28 February | n/a | 28 February | n/a | +1.9 days per decade |
| First autumn frost | 15 November | n/a | 15 November | n/a | -3.1 days per decade |
| Growing days | 259 days | n/a | 259 days | n/a | -5.0 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
38 years, 1961 to 2008A day with at least 49.9 mm (2.0 in) of rain is expected about once in 2 years. A day with at least 135.3 mm (5.3 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 49.9 mm (2.0 in) | |
| 5 years | 67.8 mm (2.7 in) | |
| 10 years | 81.4 mm (3.2 in) | |
| 25 years | 100.9 mm (4.0 in) | |
| 50 years | 117.3 mm (4.6 in) | Longer than the 38 years of record |
| 100 years | 135.3 mm (5.3 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 1961 to 2008.
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: 133.9 mm (5.3 in) in 1970; 103.9 mm (4.1 in) in 1971; 89.9 mm (3.5 in) in 1985.
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).