Zacatlan Weather Records (MXN00021107)
Record envelope, standing records and threshold days for Zacatlan (MXN00021107), Mexico, with 55 years of record.
Key Facts for Zacatlan
- Zacatlan (MXN00021107) is a weather station in Mexico at 19.95 latitude and -97.95 longitude, 2,084 m (6,837 ft) above sea level.
- The station reports from 1955 to 2009, 55 years of record.
- 1,464 records set at Zacatlan still stand.
- Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
- Zacatlan set a daily record low maximum temperature of 7.8 C (46.0 F) on 20 December 2009.
About the Station
- Location: Mexico, 19.95 latitude, -97.95 longitude.
- Elevation: 2,084 m (6,837 ft).
- Period of record: 1955 to 2009, 55 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 | 28.9 C (84.0 F) | -6.1 C (21.0 F) | n/a | n/a |
| Feb | 31.7 C (89.1 F) | -5.0 C (23.0 F) | n/a | n/a |
| Mar | 33.9 C (93.0 F) | -1.1 C (30.0 F) | n/a | n/a |
| Apr | 35.6 C (96.1 F) | -2.2 C (28.0 F) | n/a | n/a |
| May | 33.9 C (93.0 F) | 0.0 C (32.0 F) | n/a | n/a |
| Jun | 36.7 C (98.1 F) | 2.8 C (37.0 F) | n/a | n/a |
| Jul | 28.9 C (84.0 F) | 2.8 C (37.0 F) | n/a | n/a |
| Aug | 28.9 C (84.0 F) | 3.9 C (39.0 F) | n/a | n/a |
| Sep | 30.0 C (86.0 F) | -1.1 C (30.0 F) | n/a | n/a |
| Oct | 28.9 C (84.0 F) | -2.2 C (28.0 F) | n/a | n/a |
| Nov | 28.9 C (84.0 F) | -5.0 C (23.0 F) | n/a | n/a |
| Dec | 27.8 C (82.0 F) | -4.4 C (24.1 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1955 | 6 |
| 1956 | 47 |
| 1957 | 67 |
| 1958 | 64 |
| 1959 | 44 |
| 1960 | 59 |
| 1961 | 50 |
| 1962 | 66 |
| 1963 | 31 |
| 1964 | 61 |
| 1965 | 54 |
| 1966 | 45 |
| 1967 | 38 |
| 1968 | 21 |
| 1969 | 40 |
| 1970 | 33 |
| 1971 | 40 |
| 1972 | 22 |
| 1973 | 32 |
| 1974 | 17 |
| 1975 | 35 |
| 1976 | 25 |
| 1977 | 24 |
| 1978 | 22 |
| 1979 | 22 |
| 1980 | 15 |
| 1981 | 15 |
| 1982 | 11 |
| 1983 | 19 |
| 1984 | 30 |
| 1985 | 21 |
| 1986 | 22 |
| 1987 | 18 |
| 1988 | 29 |
| 1989 | 41 |
| 1990 | 27 |
| 1991 | 24 |
| 1992 | 20 |
| 1993 | 28 |
| 1994 | 73 |
| 1995 | 7 |
| 2007 | 28 |
| 2008 | 28 |
| 2009 | 43 |
All-Time Record Progression
3 new records| Date | Kind | Detail |
|---|---|---|
| 1994-03-06 | Record high minimum temperature | Record high minimum temperature 18.3 C (64.9 F) |
| 1994-03-07 | Record high minimum temperature | Record high minimum temperature 20.0 C (68.0 F) |
| 2008-01-02 | Record low maximum temperature | Record low maximum temperature 1.7 C (35.1 F) |
Wettest Day of Each Month
Sep: 125.0 mm (4.9 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 69.9 mm (2.8 in) | 12 January 1968 |
| Feb | 34.8 mm (1.4 in) | 24 February 1974 |
| Mar | 38.9 mm (1.5 in) | 7 March 1956 |
| Apr | 33.3 mm (1.3 in) | 20 April 1979 |
| May | 58.9 mm (2.3 in) | 17 May 1959 |
| Jun | 84.8 mm (3.3 in) | 21 June 1973 |
| Jul | 69.6 mm (2.7 in) | 2 July 1969 |
| Aug | 122.9 mm (4.8 in) | 22 August 2007 |
| Sep | 125.0 mm (4.9 in) | 29 September 1974 |
| Oct | 100.8 mm (4.0 in) | 13 October 1958 |
| Nov | 59.9 mm (2.4 in) | 8 November 1971 |
| Dec | 35.3 mm (1.4 in) | 7 December 1973 |
Period of Record Coverage
1955 to 2009| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1955 | 25 | 7% | No |
| 1956 | 366 | 100% | Yes |
| 1957 | 364 | 100% | Yes |
| 1958 | 336 | 92% | Yes |
| 1959 | 365 | 100% | Yes |
| 1960 | 366 | 100% | Yes |
| 1961 | 365 | 100% | Yes |
| 1962 | 365 | 100% | Yes |
| 1963 | 365 | 100% | Yes |
| 1964 | 365 | 100% | Yes |
| 1965 | 364 | 100% | Yes |
| 1966 | 273 | 75% | No |
| 1967 | 364 | 100% | Yes |
| 1968 | 336 | 92% | Yes |
| 1969 | 359 | 98% | Yes |
| 1970 | 331 | 91% | Yes |
| 1971 | 364 | 100% | Yes |
| 1972 | 366 | 100% | Yes |
| 1973 | 365 | 100% | Yes |
| 1974 | 364 | 100% | Yes |
| 1975 | 365 | 100% | Yes |
| 1976 | 365 | 100% | Yes |
| 1977 | 365 | 100% | Yes |
| 1978 | 365 | 100% | Yes |
| 1979 | 365 | 100% | Yes |
| 1980 | 365 | 100% | Yes |
| 1981 | 337 | 92% | Yes |
| 1982 | 365 | 100% | Yes |
| 1983 | 364 | 100% | Yes |
| 1984 | 366 | 100% | Yes |
| 1985 | 365 | 100% | Yes |
| 1986 | 211 | 58% | No |
| 1987 | 151 | 41% | No |
| 1988 | 242 | 66% | No |
| 1989 | 361 | 99% | Yes |
| 1990 | 330 | 90% | Yes |
| 1991 | 360 | 99% | Yes |
| 1992 | 358 | 98% | Yes |
| 1993 | 334 | 92% | Yes |
| 1994 | 363 | 99% | Yes |
| 1995 | 120 | 33% | No |
| 2007 | 356 | 98% | Yes |
| 2008 | 360 | 98% | Yes |
| 2009 | 365 | 100% | Yes |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 20 December 2009 | Zacatlan, MX | daily low max | 7.8 C (46.0 F) | 2.2 C (4.0 F) | 50 years | 25 of 100 (Routine) |
| 6 December 2009 | Zacatlan, MX | daily high max (Tie) | 25.6 C (78.1 F) | tie | 52 years | 5 of 100 (Routine) |
| 28 November 2009 | Zacatlan, MX | daily low max | 10.0 C (50.0 F) | 1.7 C (3.1 F) | 43 years | 21 of 100 (Routine) |
| 27 November 2009 | Zacatlan, MX | daily low max (Tie) | 10.0 C (50.0 F) | tie | 28 years | 3 of 100 (Routine) |
| 21 November 2009 | Zacatlan, MX | daily high max (Tie) | 25.0 C (77.0 F) | tie | 46 years | 4 of 100 (Routine) |
| 18 November 2009 | Zacatlan, MX | daily low max | 8.9 C (48.0 F) | 2.8 C (5.0 F) | 28 years | 20 of 100 (Routine) |
| 13 November 2009 | Zacatlan, MX | daily low min (Tie) | 0.0 C (32.0 F) | tie | 52 years | 5 of 100 (Routine) |
| 12 November 2009 | Zacatlan, MX | daily low max | 7.8 C (46.0 F) | 2.8 C (5.0 F) | 28 years | 20 of 100 (Routine) |
| 11 November 2009 | Zacatlan, MX | daily low max | 10.0 C (50.0 F) | 0.6 C (1.1 F) | 28 years | 14 of 100 (Routine) |
| 8 November 2009 | Zacatlan, MX | daily low max | 13.9 C (57.0 F) | 1.1 C (2.0 F) | 47 years | 21 of 100 (Routine) |
| 6 November 2009 | Zacatlan, MX | daily low max (Tie) | 11.7 C (53.1 F) | tie | 32 years | 3 of 100 (Routine) |
| 5 November 2009 | Zacatlan, MX | daily low max | 10.0 C (50.0 F) | 0.6 C (1.1 F) | 27 years | 14 of 100 (Routine) |
| 30 October 2009 | Zacatlan, MX | daily rain | 33.8 mm (1.3 in) | 8.4 mm (0.33 in) | 32 years | 20 of 100 (Routine) |
| 18 October 2009 | Zacatlan, MX | daily low max | 8.9 C (48.0 F) | 1.7 C (3.1 F) | 0 years | 10 of 100 (Routine) |
| 17 October 2009 | Zacatlan, MX | daily rain | 86.9 mm (3.4 in) | 61.2 mm (2.4 in) | 34 years | 55 of 100 (Notable) |
| 17 October 2009 | Zacatlan, MX | daily low max (Tie) | 12.8 C (55.0 F) | tie | 35 years | 3 of 100 (Routine) |
| 2 October 2009 | Zacatlan, MX | daily high max (Tie) | 25.0 C (77.0 F) | tie | 50 years | 5 of 100 (Routine) |
| 24 September 2009 | Zacatlan, MX | daily rain | 55.9 mm (2.2 in) | 31.0 mm (1.2 in) | 0 years | 27 of 100 (Routine) |
| 20 September 2009 | Zacatlan, MX | daily low max (Tie) | 16.7 C (62.1 F) | tie | 47 years | 4 of 100 (Routine) |
| 28 August 2009 | Zacatlan, MX | daily low min (Tie) | 6.7 C (44.1 F) | tie | 34 years | 3 of 100 (Routine) |
Climate Trend
31 complete years, 1956 to 2009| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1956 | 14.6 C | +0.19 C |
| 1957 | 15.4 C | +0.96 C |
| 1959 | 15.1 C | +0.72 C |
| 1960 | 15.0 C | +0.62 C |
| 1961 | 14.7 C | +0.25 C |
| 1962 | 14.9 C | +0.47 C |
| 1963 | 14.5 C | +0.07 C |
| 1964 | 14.9 C | +0.51 C |
| 1965 | 14.5 C | +0.11 C |
| 1967 | 14.4 C | -0.06 C |
| 1971 | 15.0 C | +0.56 C |
| 1972 | 14.9 C | +0.52 C |
| 1973 | 15.3 C | +0.91 C |
| 1974 | 14.6 C | +0.23 C |
| 1975 | 14.6 C | +0.17 C |
| 1976 | 13.2 C | -1.21 C |
| 1977 | 13.3 C | -1.08 C |
| 1978 | 14.3 C | -0.14 C |
| 1979 | 14.2 C | -0.25 C |
| 1980 | 14.1 C | -0.30 C |
| 1982 | 14.1 C | -0.27 C |
| 1983 | 14.0 C | -0.38 C |
| 1984 | 13.6 C | -0.78 C |
| 1985 | 13.7 C | -0.67 C |
| 1989 | 14.3 C | -0.11 C |
| 1991 | 15.2 C | +0.80 C |
| 1992 | 14.3 C | -0.13 C |
| 1994 | 16.5 C | +2.05 C |
| 2007 | 13.4 C | -1.04 C |
| 2008 | 12.9 C | -1.55 C |
| 2009 | 13.1 C | -1.32 C |
The annual mean temperature here has fallen by 0.3 C (0.1 to 0.4) per decade over 1956 to 2009. In Fahrenheit: 0.5 F (0.2 to 0.8) per decade. The slope is a straight line fitted to 31 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 (-0.4 to -0.1) per decade | -0.5 F (-0.8 to -0.2) per decade | 1956 to 2009 | 31 | Fall |
| Mean daily maximum | -0.6 C (-0.8 to -0.4) per decade | -1.0 F (-1.4 to -0.6) per decade | 1956 to 2009 | 31 | Fall |
| Mean daily minimum | 0.1 C (-0.2 to 0.3) per decade | 0.1 F (-0.3 to 0.5) per decade | 1956 to 2009 | 31 | 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
1955 to 2009| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 36.7 C (98.1 F) | 1957 | 31.4 C (88.5 F) | 44 |
| Coldest night (TNn) | -6.1 C (21.0 F) | 1956 | -2.2 C (28.0 F) | 44 |
| Wettest day (Rx1day) | 125.0 mm (4.9 in) | 1974 | 57.4 mm (2.3 in) | 44 |
| Wettest five days (Rx5day) | 271.7 mm (10.7 in) | 1958 | 120.5 mm (4.7 in) | 44 |
| Longest dry spell (CDD) | 56 days | 2009 | 24 days | 44 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1955 | 23.9 C (75.0 F) |
| 1956 | 35.0 C (95.0 F) |
| 1957 | 36.7 C (98.1 F) |
| 1958 | 35.0 C (95.0 F) |
| 1959 | 30.0 C (86.0 F) |
| 1960 | 33.9 C (93.0 F) |
| 1961 | 35.0 C (95.0 F) |
| 1962 | 32.8 C (91.0 F) |
| 1963 | 30.6 C (87.1 F) |
| 1964 | 32.8 C (91.0 F) |
| 1965 | 31.7 C (89.1 F) |
| 1966 | 28.9 C (84.0 F) |
| 1967 | 32.8 C (91.0 F) |
| 1968 | 28.9 C (84.0 F) |
| 1969 | 31.7 C (89.1 F) |
| 1970 | 31.7 C (89.1 F) |
| 1971 | 31.7 C (89.1 F) |
| 1972 | 32.8 C (91.0 F) |
| 1973 | 33.9 C (93.0 F) |
| 1974 | 31.7 C (89.1 F) |
| 1975 | 32.8 C (91.0 F) |
| 1976 | 28.9 C (84.0 F) |
| 1977 | 32.8 C (91.0 F) |
| 1978 | 31.7 C (89.1 F) |
| 1979 | 31.7 C (89.1 F) |
| 1980 | 30.6 C (87.1 F) |
| 1981 | 26.7 C (80.1 F) |
| 1982 | 30.0 C (86.0 F) |
| 1983 | 32.8 C (91.0 F) |
| 1984 | 32.8 C (91.0 F) |
| 1985 | 30.0 C (86.0 F) |
| 1986 | 28.9 C (84.0 F) |
| 1987 | 30.0 C (86.0 F) |
| 1988 | 30.0 C (86.0 F) |
| 1989 | 31.7 C (89.1 F) |
| 1990 | 30.0 C (86.0 F) |
| 1991 | 30.0 C (86.0 F) |
| 1992 | 27.8 C (82.0 F) |
| 1993 | 31.1 C (88.0 F) |
| 1994 | 30.0 C (86.0 F) |
| 1995 | 29.4 C (84.9 F) |
| 2007 | 30.6 C (87.1 F) |
| 2008 | 30.0 C (86.0 F) |
| 2009 | 30.6 C (87.1 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1955 | -3.3 C (26.1 F) |
| 1956 | -6.1 C (21.0 F) |
| 1957 | -4.4 C (24.1 F) |
| 1958 | -3.3 C (26.1 F) |
| 1959 | -3.3 C (26.1 F) |
| 1960 | -4.4 C (24.1 F) |
| 1961 | -4.4 C (24.1 F) |
| 1962 | -5.0 C (23.0 F) |
| 1963 | -5.0 C (23.0 F) |
| 1964 | -3.3 C (26.1 F) |
| 1965 | -5.0 C (23.0 F) |
| 1966 | -5.0 C (23.0 F) |
| 1967 | -6.1 C (21.0 F) |
| 1968 | -1.1 C (30.0 F) |
| 1969 | -2.2 C (28.0 F) |
| 1970 | -5.0 C (23.0 F) |
| 1971 | 0.0 C (32.0 F) |
| 1972 | -3.3 C (26.1 F) |
| 1973 | -2.2 C (28.0 F) |
| 1974 | -1.1 C (30.0 F) |
| 1975 | 0.0 C (32.0 F) |
| 1976 | -4.4 C (24.1 F) |
| 1977 | -1.1 C (30.0 F) |
| 1978 | 0.6 C (33.1 F) |
| 1979 | -4.4 C (24.1 F) |
| 1980 | -1.1 C (30.0 F) |
| 1981 | 0.6 C (33.1 F) |
| 1982 | -2.2 C (28.0 F) |
| 1983 | -1.1 C (30.0 F) |
| 1984 | -2.2 C (28.0 F) |
| 1985 | -2.2 C (28.0 F) |
| 1986 | -4.4 C (24.1 F) |
| 1987 | -2.2 C (28.0 F) |
| 1988 | 0.0 C (32.0 F) |
| 1989 | 0.0 C (32.0 F) |
| 1990 | 0.0 C (32.0 F) |
| 1991 | 0.6 C (33.1 F) |
| 1992 | 0.0 C (32.0 F) |
| 1993 | 3.3 C (37.9 F) |
| 1994 | 1.1 C (34.0 F) |
| 1995 | 2.2 C (36.0 F) |
| 2007 | 0.0 C (32.0 F) |
| 2008 | -1.1 C (30.0 F) |
| 2009 | -2.2 C (28.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1955 | 20.8 mm (0.8 in) |
| 1956 | 57.9 mm (2.3 in) |
| 1957 | 28.4 mm (1.1 in) |
| 1958 | 100.8 mm (4.0 in) |
| 1959 | 58.9 mm (2.3 in) |
| 1960 | 47.0 mm (1.9 in) |
| 1961 | 106.4 mm (4.2 in) |
| 1962 | 58.2 mm (2.3 in) |
| 1963 | 53.3 mm (2.1 in) |
| 1964 | 45.0 mm (1.8 in) |
| 1965 | 44.7 mm (1.8 in) |
| 1966 | 45.0 mm (1.8 in) |
| 1967 | 48.8 mm (1.9 in) |
| 1968 | 69.9 mm (2.8 in) |
| 1969 | 81.8 mm (3.2 in) |
| 1970 | 64.8 mm (2.6 in) |
| 1971 | 59.9 mm (2.4 in) |
| 1972 | 54.9 mm (2.2 in) |
| 1973 | 84.8 mm (3.3 in) |
| 1974 | 125.0 mm (4.9 in) |
| 1975 | 110.0 mm (4.3 in) |
| 1976 | 66.8 mm (2.6 in) |
| 1977 | 30.0 mm (1.2 in) |
| 1978 | 49.8 mm (2.0 in) |
| 1979 | 119.9 mm (4.7 in) |
| 1980 | 60.2 mm (2.4 in) |
| 1981 | 89.7 mm (3.5 in) |
| 1982 | 33.3 mm (1.3 in) |
| 1983 | 55.9 mm (2.2 in) |
| 1984 | 63.0 mm (2.5 in) |
| 1985 | 52.6 mm (2.1 in) |
| 1986 | 33.3 mm (1.3 in) |
| 1987 | 10.7 mm (0.4 in) |
| 1988 | 65.8 mm (2.6 in) |
| 1989 | 35.6 mm (1.4 in) |
| 1990 | 62.5 mm (2.5 in) |
| 1991 | 56.9 mm (2.2 in) |
| 1992 | 63.5 mm (2.5 in) |
| 1993 | 49.3 mm (1.9 in) |
| 1994 | 45.0 mm (1.8 in) |
| 1995 | 17.3 mm (0.7 in) |
| 2007 | 122.9 mm (4.8 in) |
| 2008 | 31.0 mm (1.2 in) |
| 2009 | 86.9 mm (3.4 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1955 | 41.5 mm (1.6 in) |
| 1956 | 175.3 mm (6.9 in) |
| 1957 | 88.7 mm (3.5 in) |
| 1958 | 271.7 mm (10.7 in) |
| 1959 | 119.0 mm (4.7 in) |
| 1960 | 105.1 mm (4.1 in) |
| 1961 | 145.3 mm (5.7 in) |
| 1962 | 98.5 mm (3.9 in) |
| 1963 | 152.6 mm (6.0 in) |
| 1964 | 85.1 mm (3.4 in) |
| 1965 | 101.2 mm (4.0 in) |
| 1966 | 130.3 mm (5.1 in) |
| 1967 | 121.9 mm (4.8 in) |
| 1968 | 71.5 mm (2.8 in) |
| 1969 | 185.6 mm (7.3 in) |
| 1970 | 101.2 mm (4.0 in) |
| 1971 | 112.8 mm (4.4 in) |
| 1972 | 124.0 mm (4.9 in) |
| 1973 | 151.1 mm (5.9 in) |
| 1974 | 176.0 mm (6.9 in) |
| 1975 | 246.9 mm (9.7 in) |
| 1976 | 200.9 mm (7.9 in) |
| 1977 | 44.0 mm (1.7 in) |
| 1978 | 110.5 mm (4.4 in) |
| 1979 | 136.4 mm (5.4 in) |
| 1980 | 123.7 mm (4.9 in) |
| 1981 | 220.8 mm (8.7 in) |
| 1982 | 93.8 mm (3.7 in) |
| 1983 | 111.7 mm (4.4 in) |
| 1984 | 173.6 mm (6.8 in) |
| 1985 | 99.1 mm (3.9 in) |
| 1986 | 69.7 mm (2.7 in) |
| 1987 | 26.8 mm (1.1 in) |
| 1988 | 140.7 mm (5.5 in) |
| 1989 | 62.1 mm (2.4 in) |
| 1990 | 169.0 mm (6.7 in) |
| 1991 | 134.1 mm (5.3 in) |
| 1992 | 127.5 mm (5.0 in) |
| 1993 | 103.4 mm (4.1 in) |
| 1994 | 81.1 mm (3.2 in) |
| 1995 | 35.6 mm (1.4 in) |
| 2007 | 155.2 mm (6.1 in) |
| 2008 | 95.5 mm (3.8 in) |
| 2009 | 152.4 mm (6.0 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1955 | 9 days |
| 1956 | 54 days |
| 1957 | 25 days |
| 1958 | 23 days |
| 1959 | 25 days |
| 1960 | 22 days |
| 1961 | 32 days |
| 1962 | 30 days |
| 1963 | 21 days |
| 1964 | 28 days |
| 1965 | 29 days |
| 1966 | 14 days |
| 1967 | 23 days |
| 1968 | 22 days |
| 1969 | 18 days |
| 1970 | 38 days |
| 1971 | 27 days |
| 1972 | 25 days |
| 1973 | 23 days |
| 1974 | 27 days |
| 1975 | 24 days |
| 1976 | 13 days |
| 1977 | 39 days |
| 1978 | 30 days |
| 1979 | 29 days |
| 1980 | 24 days |
| 1981 | 24 days |
| 1982 | 18 days |
| 1983 | 19 days |
| 1984 | 19 days |
| 1985 | 17 days |
| 1986 | 26 days |
| 1987 | 15 days |
| 1988 | 19 days |
| 1989 | 24 days |
| 1990 | 15 days |
| 1991 | 35 days |
| 1992 | 20 days |
| 1993 | 22 days |
| 1994 | 20 days |
| 1995 | 24 days |
| 2007 | 23 days |
| 2008 | 26 days |
| 2009 | 56 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.
Rainfall Return Levels
36 years, 1956 to 2009A day with at least 59.5 mm (2.3 in) of rain is expected about once in 2 years. A day with at least 160.6 mm (6.3 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 59.5 mm (2.3 in) | |
| 5 years | 83.2 mm (3.3 in) | |
| 10 years | 100.1 mm (3.9 in) | |
| 25 years | 123.1 mm (4.8 in) | |
| 50 years | 141.4 mm (5.6 in) | Longer than the 36 years of record |
| 100 years | 160.6 mm (6.3 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 1956 to 2009.
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: 125.0 mm (4.9 in) in 1974; 122.9 mm (4.8 in) in 2007; 119.9 mm (4.7 in) in 1979.
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).