Parral A. El Hormiguero Weather Records (MXN00008273)
Record envelope, standing records and threshold days for Parral A. El Hormiguero (MXN00008273), Mexico, with 67 years of record.
Key Facts for Parral A. El Hormiguero
- Parral A. El Hormiguero (MXN00008273) is a weather station in Mexico at 26.90 latitude and -105.62 longitude, 1,836 m (6,023 ft) above sea level.
- The station reports from 1933 to 1999, 67 years of record.
- 1,464 records set at Parral A. El Hormiguero still stand.
- Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
- Parral A. El Hormiguero set a daily record low maximum temperature of 5.0 C (41.0 F) on 25 December 1999.
About the Station
- Location: Mexico, 26.90 latitude, -105.62 longitude.
- Elevation: 1,836 m (6,023 ft).
- Period of record: 1933 to 1999, 67 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 | 30.0 C (86.0 F) | -14.4 C (6.1 F) | n/a | n/a |
| Feb | 30.6 C (87.1 F) | -9.4 C (15.1 F) | n/a | n/a |
| Mar | 31.7 C (89.1 F) | -7.2 C (19.0 F) | n/a | n/a |
| Apr | 35.6 C (96.1 F) | -6.1 C (21.0 F) | n/a | n/a |
| May | 38.9 C (102.0 F) | 0.0 C (32.0 F) | n/a | n/a |
| Jun | 41.7 C (107.1 F) | 2.8 C (37.0 F) | n/a | n/a |
| Jul | 37.8 C (100.0 F) | 5.6 C (42.1 F) | n/a | n/a |
| Aug | 37.8 C (100.0 F) | 2.8 C (37.0 F) | n/a | n/a |
| Sep | 38.9 C (102.0 F) | -1.1 C (30.0 F) | n/a | n/a |
| Oct | 31.7 C (89.1 F) | -5.0 C (23.0 F) | n/a | n/a |
| Nov | 30.0 C (86.0 F) | -12.2 C (10.0 F) | n/a | n/a |
| Dec | 27.8 C (82.0 F) | -12.2 C (10.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1933 | 7 |
| 1935 | 20 |
| 1936 | 41 |
| 1937 | 92 |
| 1938 | 40 |
| 1939 | 31 |
| 1940 | 39 |
| 1941 | 23 |
| 1942 | 18 |
| 1943 | 27 |
| 1944 | 32 |
| 1945 | 30 |
| 1946 | 23 |
| 1947 | 44 |
| 1948 | 93 |
| 1949 | 37 |
| 1950 | 36 |
| 1951 | 45 |
| 1952 | 29 |
| 1975 | 193 |
| 1976 | 27 |
| 1977 | 25 |
| 1978 | 27 |
| 1979 | 32 |
| 1980 | 26 |
| 1981 | 17 |
| 1982 | 20 |
| 1983 | 13 |
| 1984 | 18 |
| 1985 | 10 |
| 1986 | 28 |
| 1987 | 28 |
| 1988 | 28 |
| 1989 | 30 |
| 1990 | 20 |
| 1991 | 14 |
| 1992 | 22 |
| 1993 | 17 |
| 1994 | 9 |
| 1995 | 16 |
| 1996 | 27 |
| 1997 | 36 |
| 1998 | 46 |
| 1999 | 28 |
Wettest Day of Each Month
Sep: 103.9 mm (4.1 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 33.0 mm (1.3 in) | 29 January 1984 |
| Feb | 10.7 mm (0.4 in) | 2 February 1986 |
| Mar | 18.0 mm (0.7 in) | 10 March 1979 |
| Apr | 19.8 mm (0.8 in) | 13 April 1946 |
| May | 37.8 mm (1.5 in) | 14 May 1952 |
| Jun | 49.8 mm (2.0 in) | 12 June 1952 |
| Jul | 69.9 mm (2.8 in) | 23 July 1949 |
| Aug | 98.8 mm (3.9 in) | 28 August 1941 |
| Sep | 103.9 mm (4.1 in) | 8 September 1944 |
| Oct | 99.8 mm (3.9 in) | 1 October 1945 |
| Nov | 19.1 mm (0.8 in) | 13 November 1998 |
| Dec | 31.8 mm (1.3 in) | 25 December 1952 |
Period of Record Coverage
1933 to 1999| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1933 | 44 | 12% | No |
| 1935 | 152 | 42% | No |
| 1936 | 360 | 98% | Yes |
| 1937 | 344 | 94% | Yes |
| 1938 | 272 | 75% | No |
| 1939 | 359 | 98% | Yes |
| 1940 | 362 | 99% | Yes |
| 1941 | 365 | 100% | Yes |
| 1942 | 364 | 100% | Yes |
| 1943 | 364 | 100% | Yes |
| 1944 | 365 | 100% | Yes |
| 1945 | 365 | 100% | Yes |
| 1946 | 363 | 99% | Yes |
| 1947 | 363 | 99% | Yes |
| 1948 | 366 | 100% | Yes |
| 1949 | 364 | 100% | Yes |
| 1950 | 364 | 100% | Yes |
| 1951 | 365 | 100% | Yes |
| 1952 | 365 | 100% | Yes |
| 1975 | 245 | 67% | No |
| 1976 | 366 | 100% | Yes |
| 1977 | 365 | 100% | Yes |
| 1978 | 364 | 100% | Yes |
| 1979 | 364 | 100% | Yes |
| 1980 | 365 | 100% | Yes |
| 1981 | 365 | 100% | Yes |
| 1982 | 363 | 99% | Yes |
| 1983 | 365 | 100% | Yes |
| 1984 | 330 | 90% | Yes |
| 1985 | 181 | 50% | No |
| 1986 | 360 | 99% | Yes |
| 1987 | 299 | 82% | No |
| 1988 | 360 | 98% | Yes |
| 1989 | 269 | 74% | No |
| 1990 | 330 | 90% | Yes |
| 1991 | 265 | 73% | No |
| 1992 | 324 | 89% | No |
| 1993 | 325 | 89% | No |
| 1994 | 353 | 97% | Yes |
| 1995 | 265 | 73% | No |
| 1996 | 342 | 93% | Yes |
| 1997 | 327 | 90% | No |
| 1998 | 256 | 70% | No |
| 1999 | 350 | 96% | Yes |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 25 December 1999 | Parral A. El Hormiguero, MX | daily low max | 5.0 C (41.0 F) | 0.6 C (1.1 F) | 52 years | 22 of 100 (Routine) |
| 24 December 1999 | Parral A. El Hormiguero, MX | daily low max | 5.6 C (42.1 F) | 3.3 C (5.9 F) | 52 years | 28 of 100 (Routine) |
| 23 December 1999 | Parral A. El Hormiguero, MX | daily low max | 5.6 C (42.1 F) | 4.4 C (7.9 F) | 4 years | 17 of 100 (Routine) |
| 22 December 1999 | Parral A. El Hormiguero, MX | daily low min | -7.2 C (19.0 F) | 1.1 C (2.0 F) | 21 years | 14 of 100 (Routine) |
| 6 December 1999 | Parral A. El Hormiguero, MX | daily low min | -7.2 C (19.0 F) | 2.2 C (4.0 F) | 14 years | 14 of 100 (Routine) |
| 5 December 1999 | Parral A. El Hormiguero, MX | daily low min | -6.1 C (21.0 F) | 1.1 C (2.0 F) | 14 years | 12 of 100 (Routine) |
| 8 November 1999 | Parral A. El Hormiguero, MX | daily high max (Tie) | 27.8 C (82.0 F) | tie | 48 years | 5 of 100 (Routine) |
| 7 November 1999 | Parral A. El Hormiguero, MX | daily high max (Tie) | 26.7 C (80.1 F) | tie | 53 years | 5 of 100 (Routine) |
| 2 November 1999 | Parral A. El Hormiguero, MX | daily low min (Tie) | -2.2 C (28.0 F) | tie | 8 years | 2 of 100 (Routine) |
| 29 October 1999 | Parral A. El Hormiguero, MX | daily high max (Tie) | 28.9 C (84.0 F) | tie | 48 years | 5 of 100 (Routine) |
| 27 October 1999 | Parral A. El Hormiguero, MX | daily high max (Tie) | 28.9 C (84.0 F) | tie | 48 years | 5 of 100 (Routine) |
| 24 October 1999 | Parral A. El Hormiguero, MX | daily low min | -1.1 C (30.0 F) | 1.7 C (3.1 F) | 5 years | 11 of 100 (Routine) |
| 23 October 1999 | Parral A. El Hormiguero, MX | daily low min (Tie) | -1.1 C (30.0 F) | tie | 5 years | 1 of 100 (Routine) |
| 20 October 1999 | Parral A. El Hormiguero, MX | daily low min | -1.1 C (30.0 F) | 1.1 C (2.0 F) | 9 years | 10 of 100 (Routine) |
| 27 September 1999 | Parral A. El Hormiguero, MX | daily high max (Tie) | 32.8 C (91.0 F) | tie | 21 years | 3 of 100 (Routine) |
| 25 September 1999 | Parral A. El Hormiguero, MX | daily high min | 17.8 C (64.0 F) | 2.2 C (4.0 F) | 58 years | 30 of 100 (Routine) |
| 24 September 1999 | Parral A. El Hormiguero, MX | daily high max | 32.8 C (91.0 F) | 1.1 C (2.0 F) | 21 years | 15 of 100 (Routine) |
| 11 September 1999 | Parral A. El Hormiguero, MX | daily high max (Tie) | 30.6 C (87.1 F) | tie | 12 years | 2 of 100 (Routine) |
| 10 September 1999 | Parral A. El Hormiguero, MX | daily high max (Tie) | 30.0 C (86.0 F) | tie | 53 years | 5 of 100 (Routine) |
| 3 September 1999 | Parral A. El Hormiguero, MX | daily low max | 20.6 C (69.1 F) | 1.1 C (2.0 F) | 60 years | 27 of 100 (Routine) |
Climate Trend
27 complete years, 1936 to 1999| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1936 | 17.7 C | +1.39 C |
| 1939 | 17.1 C | +0.75 C |
| 1940 | 17.0 C | +0.64 C |
| 1941 | 17.0 C | +0.64 C |
| 1942 | 17.0 C | +0.70 C |
| 1943 | 16.7 C | +0.39 C |
| 1945 | 16.8 C | +0.51 C |
| 1946 | 16.1 C | -0.19 C |
| 1947 | 15.7 C | -0.63 C |
| 1948 | 17.0 C | +0.65 C |
| 1949 | 16.9 C | +0.61 C |
| 1950 | 18.2 C | +1.89 C |
| 1951 | 17.7 C | +1.37 C |
| 1952 | 16.9 C | +0.52 C |
| 1976 | 15.1 C | -1.24 C |
| 1977 | 16.0 C | -0.35 C |
| 1978 | 15.7 C | -0.63 C |
| 1979 | 15.1 C | -1.21 C |
| 1980 | 15.8 C | -0.55 C |
| 1981 | 15.1 C | -1.24 C |
| 1982 | 16.5 C | +0.14 C |
| 1983 | 15.4 C | -0.98 C |
| 1986 | 15.0 C | -1.30 C |
| 1988 | 15.0 C | -1.32 C |
| 1994 | 15.8 C | -0.55 C |
| 1997 | 15.8 C | -0.52 C |
| 1999 | 16.9 C | +0.58 C |
This station does not have enough complete years (30 are needed) to fit a temperature trend.
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
1933 to 1999| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 41.7 C (107.1 F) | 1975 | 35.6 C (96.1 F) | 44 |
| Coldest night (TNn) | -14.4 C (6.1 F) | 1948 | -8.3 C (17.1 F) | 44 |
| Wettest day (Rx1day) | 103.9 mm (4.1 in) | 1944 | 47.0 mm (1.9 in) | 44 |
| Wettest five days (Rx5day) | 226.3 mm (8.9 in) | 1944 | 87.8 mm (3.5 in) | 44 |
| Longest dry spell (CDD) | 166 days | 1936 | 75 days | 44 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1933 | 30.6 C (87.1 F) |
| 1935 | 30.6 C (87.1 F) |
| 1936 | 35.6 C (96.1 F) |
| 1937 | 35.6 C (96.1 F) |
| 1938 | 33.9 C (93.0 F) |
| 1939 | 36.1 C (97.0 F) |
| 1940 | 33.3 C (91.9 F) |
| 1941 | 34.4 C (93.9 F) |
| 1942 | 38.3 C (100.9 F) |
| 1943 | 33.3 C (91.9 F) |
| 1944 | 37.8 C (100.0 F) |
| 1945 | 36.7 C (98.1 F) |
| 1946 | 35.6 C (96.1 F) |
| 1947 | 38.9 C (102.0 F) |
| 1948 | 36.7 C (98.1 F) |
| 1949 | 38.9 C (102.0 F) |
| 1950 | 33.9 C (93.0 F) |
| 1951 | 36.7 C (98.1 F) |
| 1952 | 36.7 C (98.1 F) |
| 1975 | 41.7 C (107.1 F) |
| 1976 | 35.0 C (95.0 F) |
| 1977 | 33.9 C (93.0 F) |
| 1978 | 35.6 C (96.1 F) |
| 1979 | 35.0 C (95.0 F) |
| 1980 | 36.7 C (98.1 F) |
| 1981 | 35.6 C (96.1 F) |
| 1982 | 36.7 C (98.1 F) |
| 1983 | 33.9 C (93.0 F) |
| 1984 | 33.9 C (93.0 F) |
| 1985 | 30.6 C (87.1 F) |
| 1986 | 32.8 C (91.0 F) |
| 1987 | 35.0 C (95.0 F) |
| 1988 | 33.9 C (93.0 F) |
| 1989 | 36.7 C (98.1 F) |
| 1990 | 35.0 C (95.0 F) |
| 1991 | 35.0 C (95.0 F) |
| 1992 | 35.6 C (96.1 F) |
| 1993 | 35.0 C (95.0 F) |
| 1994 | 37.8 C (100.0 F) |
| 1995 | 35.6 C (96.1 F) |
| 1996 | 36.7 C (98.1 F) |
| 1997 | 37.8 C (100.0 F) |
| 1998 | 38.3 C (100.9 F) |
| 1999 | 38.9 C (102.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1933 | 0.0 C (32.0 F) |
| 1935 | 0.6 C (33.1 F) |
| 1936 | -3.3 C (26.1 F) |
| 1937 | -6.1 C (21.0 F) |
| 1938 | -3.3 C (26.1 F) |
| 1939 | -4.4 C (24.1 F) |
| 1940 | -5.0 C (23.0 F) |
| 1941 | -3.3 C (26.1 F) |
| 1942 | -4.4 C (24.1 F) |
| 1943 | -3.3 C (26.1 F) |
| 1944 | -10.0 C (14.0 F) |
| 1945 | -4.4 C (24.1 F) |
| 1946 | -7.2 C (19.0 F) |
| 1947 | -10.6 C (12.9 F) |
| 1948 | -14.4 C (6.1 F) |
| 1949 | -14.4 C (6.1 F) |
| 1950 | -1.1 C (30.0 F) |
| 1951 | -9.4 C (15.1 F) |
| 1952 | -3.3 C (26.1 F) |
| 1975 | -11.1 C (12.0 F) |
| 1976 | -9.4 C (15.1 F) |
| 1977 | -7.2 C (19.0 F) |
| 1978 | -12.2 C (10.0 F) |
| 1979 | -8.3 C (17.1 F) |
| 1980 | -7.2 C (19.0 F) |
| 1981 | -6.1 C (21.0 F) |
| 1982 | -8.3 C (17.1 F) |
| 1983 | -9.4 C (15.1 F) |
| 1984 | -8.3 C (17.1 F) |
| 1985 | -9.4 C (15.1 F) |
| 1986 | -8.3 C (17.1 F) |
| 1987 | -11.1 C (12.0 F) |
| 1988 | -11.1 C (12.0 F) |
| 1989 | -9.4 C (15.1 F) |
| 1990 | -9.4 C (15.1 F) |
| 1991 | -9.4 C (15.1 F) |
| 1992 | -12.2 C (10.0 F) |
| 1993 | -6.1 C (21.0 F) |
| 1994 | -11.1 C (12.0 F) |
| 1995 | -8.3 C (17.1 F) |
| 1996 | -10.0 C (14.0 F) |
| 1997 | -9.4 C (15.1 F) |
| 1998 | -10.0 C (14.0 F) |
| 1999 | -7.2 C (19.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1933 | 2.3 mm (0.09 in) |
| 1935 | 0.0 mm (0.00 in) |
| 1936 | 6.9 mm (0.27 in) |
| 1937 | 74.9 mm (2.9 in) |
| 1938 | 39.9 mm (1.6 in) |
| 1939 | 47.8 mm (1.9 in) |
| 1940 | 39.9 mm (1.6 in) |
| 1941 | 98.8 mm (3.9 in) |
| 1942 | 59.9 mm (2.4 in) |
| 1943 | 63.0 mm (2.5 in) |
| 1944 | 103.9 mm (4.1 in) |
| 1945 | 99.8 mm (3.9 in) |
| 1946 | 59.9 mm (2.4 in) |
| 1947 | 31.8 mm (1.3 in) |
| 1948 | 42.4 mm (1.7 in) |
| 1949 | 93.0 mm (3.7 in) |
| 1950 | 47.0 mm (1.9 in) |
| 1951 | 39.4 mm (1.6 in) |
| 1952 | 49.8 mm (2.0 in) |
| 1975 | 53.1 mm (2.1 in) |
| 1976 | 34.3 mm (1.4 in) |
| 1977 | 34.0 mm (1.3 in) |
| 1978 | 74.4 mm (2.9 in) |
| 1979 | 58.4 mm (2.3 in) |
| 1980 | 78.5 mm (3.1 in) |
| 1981 | 63.5 mm (2.5 in) |
| 1982 | 30.5 mm (1.2 in) |
| 1983 | 26.4 mm (1.0 in) |
| 1984 | 38.6 mm (1.5 in) |
| 1985 | 41.9 mm (1.6 in) |
| 1986 | 52.3 mm (2.1 in) |
| 1987 | 38.4 mm (1.5 in) |
| 1988 | 38.4 mm (1.5 in) |
| 1989 | 40.1 mm (1.6 in) |
| 1990 | 47.0 mm (1.9 in) |
| 1991 | 45.0 mm (1.8 in) |
| 1992 | 29.0 mm (1.1 in) |
| 1993 | 47.2 mm (1.9 in) |
| 1994 | 15.5 mm (0.6 in) |
| 1995 | 24.4 mm (1.0 in) |
| 1996 | 52.6 mm (2.1 in) |
| 1997 | 53.1 mm (2.1 in) |
| 1998 | 77.0 mm (3.0 in) |
| 1999 | 51.1 mm (2.0 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1933 | 2.3 mm (0.09 in) |
| 1935 | 0.0 mm (0.00 in) |
| 1936 | 20.2 mm (0.8 in) |
| 1937 | 94.0 mm (3.7 in) |
| 1938 | 82.8 mm (3.3 in) |
| 1939 | 144.3 mm (5.7 in) |
| 1940 | 56.2 mm (2.2 in) |
| 1941 | 144.3 mm (5.7 in) |
| 1942 | 149.2 mm (5.9 in) |
| 1943 | 140.5 mm (5.5 in) |
| 1944 | 226.3 mm (8.9 in) |
| 1945 | 150.9 mm (5.9 in) |
| 1946 | 115.5 mm (4.5 in) |
| 1947 | 83.7 mm (3.3 in) |
| 1948 | 99.3 mm (3.9 in) |
| 1949 | 115.9 mm (4.6 in) |
| 1950 | 87.6 mm (3.4 in) |
| 1951 | 95.0 mm (3.7 in) |
| 1952 | 79.4 mm (3.1 in) |
| 1975 | 70.2 mm (2.8 in) |
| 1976 | 51.4 mm (2.0 in) |
| 1977 | 44.4 mm (1.7 in) |
| 1978 | 125.2 mm (4.9 in) |
| 1979 | 92.2 mm (3.6 in) |
| 1980 | 180.0 mm (7.1 in) |
| 1981 | 136.2 mm (5.4 in) |
| 1982 | 38.9 mm (1.5 in) |
| 1983 | 94.5 mm (3.7 in) |
| 1984 | 87.9 mm (3.5 in) |
| 1985 | 67.6 mm (2.7 in) |
| 1986 | 87.5 mm (3.4 in) |
| 1987 | 70.7 mm (2.8 in) |
| 1988 | 120.2 mm (4.7 in) |
| 1989 | 76.0 mm (3.0 in) |
| 1990 | 118.1 mm (4.6 in) |
| 1991 | 112.1 mm (4.4 in) |
| 1992 | 49.4 mm (1.9 in) |
| 1993 | 81.2 mm (3.2 in) |
| 1994 | 30.9 mm (1.2 in) |
| 1995 | 24.4 mm (1.0 in) |
| 1996 | 141.3 mm (5.6 in) |
| 1997 | 82.6 mm (3.3 in) |
| 1998 | 93.5 mm (3.7 in) |
| 1999 | 67.5 mm (2.7 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1933 | 50 days |
| 1935 | 153 days |
| 1936 | 166 days |
| 1937 | 65 days |
| 1938 | 61 days |
| 1939 | 72 days |
| 1940 | 88 days |
| 1941 | 77 days |
| 1942 | 69 days |
| 1943 | 152 days |
| 1944 | 70 days |
| 1945 | 126 days |
| 1946 | 54 days |
| 1947 | 68 days |
| 1948 | 59 days |
| 1949 | 71 days |
| 1950 | 138 days |
| 1951 | 83 days |
| 1952 | 109 days |
| 1975 | 50 days |
| 1976 | 162 days |
| 1977 | 91 days |
| 1978 | 99 days |
| 1979 | 60 days |
| 1980 | 118 days |
| 1981 | 70 days |
| 1982 | 101 days |
| 1983 | 73 days |
| 1984 | 72 days |
| 1985 | 39 days |
| 1986 | 84 days |
| 1987 | 98 days |
| 1988 | 64 days |
| 1989 | 65 days |
| 1990 | 100 days |
| 1991 | 46 days |
| 1992 | 44 days |
| 1993 | 113 days |
| 1994 | 48 days |
| 1995 | 103 days |
| 1996 | 73 days |
| 1997 | 78 days |
| 1998 | 85 days |
| 1999 | 165 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
27 years with a frostAcross 27 years with a frost, the median last spring frost at Parral A. El Hormiguero falls on 5 April and the median first autumn frost on 7 November, which leaves a median of 232 days between them.
Fitted over all years, the growing season changes by -15.2 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1936 to 1999) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 5 April | n/a | 5 April | n/a | +8.0 days per decade |
| First autumn frost | 7 November | n/a | 7 November | n/a | -7.2 days per decade |
| Growing days | 232 days | n/a | 232 days | n/a | -15.2 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
34 years, 1936 to 1999A day with at least 50.8 mm (2.0 in) of rain is expected about once in 2 years. A day with at least 121.3 mm (4.8 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 50.8 mm (2.0 in) | |
| 5 years | 72.4 mm (2.9 in) | |
| 10 years | 85.5 mm (3.4 in) | |
| 25 years | 100.9 mm (4.0 in) | |
| 50 years | 111.4 mm (4.4 in) | Longer than the 34 years of record |
| 100 years | 121.3 mm (4.8 in) | Longer than the 34 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, 34 years of values from 1936 to 1999.
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: 103.9 mm (4.1 in) in 1944; 99.8 mm (3.9 in) in 1945; 98.8 mm (3.9 in) in 1941.
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).