San Luis Ayucan Weather Records (MXN00015095)
Record envelope, standing records and threshold days for San Luis Ayucan (MXN00015095), Mexico, with 52 years of record.
Key Facts for San Luis Ayucan
- San Luis Ayucan (MXN00015095) is a weather station in Mexico at 19.48 latitude and -99.37 longitude, 2,755 m (9,038 ft) above sea level.
- The station reports from 1961 to 2012, 52 years of record.
- 1,464 records set at San Luis Ayucan still stand.
- Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
- San Luis Ayucan tied a daily record high maximum temperature of 23.9 C (75.0 F) on 29 December 2012.
About the Station
- Location: Mexico, 19.48 latitude, -99.37 longitude.
- Elevation: 2,755 m (9,038 ft).
- Period of record: 1961 to 2012, 52 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 | 25.6 C (78.1 F) | -5.6 C (21.9 F) | n/a | n/a |
| Feb | 30.0 C (86.0 F) | -3.3 C (26.1 F) | n/a | n/a |
| Mar | 31.7 C (89.1 F) | -1.1 C (30.0 F) | n/a | n/a |
| Apr | 31.7 C (89.1 F) | -1.7 C (28.9 F) | n/a | n/a |
| May | 31.7 C (89.1 F) | 1.7 C (35.1 F) | n/a | n/a |
| Jun | 30.0 C (86.0 F) | 0.0 C (32.0 F) | n/a | n/a |
| Jul | 28.9 C (84.0 F) | 3.9 C (39.0 F) | n/a | n/a |
| Aug | 28.9 C (84.0 F) | 1.7 C (35.1 F) | n/a | n/a |
| Sep | 27.8 C (82.0 F) | 1.7 C (35.1 F) | n/a | n/a |
| Oct | 27.8 C (82.0 F) | -3.3 C (26.1 F) | n/a | n/a |
| Nov | 26.7 C (80.1 F) | -3.3 C (26.1 F) | n/a | n/a |
| Dec | 27.2 C (81.0 F) | -5.0 C (23.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1961 | 20 |
| 1962 | 38 |
| 1963 | 20 |
| 1964 | 30 |
| 1965 | 29 |
| 1966 | 40 |
| 1967 | 29 |
| 1968 | 18 |
| 1969 | 40 |
| 1970 | 35 |
| 1971 | 33 |
| 1972 | 33 |
| 1973 | 41 |
| 1974 | 39 |
| 1975 | 22 |
| 1976 | 30 |
| 1977 | 32 |
| 1978 | 35 |
| 1979 | 34 |
| 1980 | 39 |
| 1981 | 28 |
| 1982 | 56 |
| 1983 | 45 |
| 1984 | 28 |
| 1985 | 36 |
| 1986 | 54 |
| 1987 | 69 |
| 1996 | 10 |
| 1997 | 32 |
| 1998 | 76 |
| 1999 | 60 |
| 2001 | 49 |
| 2002 | 64 |
| 2003 | 18 |
| 2004 | 21 |
| 2005 | 40 |
| 2006 | 19 |
| 2007 | 29 |
| 2008 | 23 |
| 2009 | 20 |
| 2010 | 15 |
| 2011 | 19 |
| 2012 | 16 |
Wettest Day of Each Month
Jun: 99.3 mm (3.9 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 38.4 mm (1.5 in) | 10 January 1967 |
| Feb | 47.0 mm (1.9 in) | 4 February 2010 |
| Mar | 37.3 mm (1.5 in) | 12 March 2009 |
| Apr | 48.0 mm (1.9 in) | 13 April 1962 |
| May | 72.4 mm (2.9 in) | 26 May 1961 |
| Jun | 99.3 mm (3.9 in) | 14 June 1972 |
| Jul | 64.0 mm (2.5 in) | 7 July 2008 |
| Aug | 71.1 mm (2.8 in) | 23 August 1967 |
| Sep | 93.0 mm (3.7 in) | 11 September 2008 |
| Oct | 82.6 mm (3.3 in) | 20 October 1980 |
| Nov | 32.3 mm (1.3 in) | 19 November 2011 |
| Dec | 28.2 mm (1.1 in) | 31 December 1968 |
Period of Record Coverage
1961 to 2012| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1961 | 22 | 6% | No |
| 1962 | 326 | 89% | No |
| 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 | 362 | 99% | Yes |
| 1979 | 365 | 100% | Yes |
| 1980 | 366 | 100% | Yes |
| 1981 | 365 | 100% | Yes |
| 1982 | 365 | 100% | Yes |
| 1983 | 365 | 100% | Yes |
| 1984 | 365 | 100% | Yes |
| 1985 | 356 | 98% | Yes |
| 1986 | 334 | 92% | Yes |
| 1987 | 364 | 100% | Yes |
| 1996 | 151 | 41% | No |
| 1997 | 364 | 100% | Yes |
| 1998 | 365 | 100% | Yes |
| 1999 | 335 | 92% | Yes |
| 2001 | 360 | 99% | Yes |
| 2002 | 363 | 99% | Yes |
| 2003 | 364 | 100% | Yes |
| 2004 | 302 | 83% | No |
| 2005 | 364 | 100% | Yes |
| 2006 | 303 | 83% | No |
| 2007 | 360 | 99% | Yes |
| 2008 | 362 | 99% | Yes |
| 2009 | 364 | 100% | Yes |
| 2010 | 243 | 67% | No |
| 2011 | 365 | 100% | Yes |
| 2012 | 274 | 75% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 29 December 2012 | San Luis Ayucan, MX | daily high max (Tie) | 23.9 C (75.0 F) | tie | 15 years | 2 of 100 (Routine) |
| 24 December 2012 | San Luis Ayucan, MX | daily high max | 23.3 C (73.9 F) | 0.5 C (0.9 F) | 14 years | 10 of 100 (Routine) |
| 18 December 2012 | San Luis Ayucan, MX | daily high max (Tie) | 23.9 C (75.0 F) | tie | 10 years | 2 of 100 (Routine) |
| 15 December 2012 | San Luis Ayucan, MX | daily high max | 23.9 C (75.0 F) | 1.7 C (3.1 F) | 42 years | 22 of 100 (Routine) |
| 24 November 2012 | San Luis Ayucan, MX | daily low max | 16.1 C (61.0 F) | 0.6 C (1.1 F) | 36 years | 17 of 100 (Routine) |
| 17 November 2012 | San Luis Ayucan, MX | daily low max | 13.9 C (57.0 F) | 1.1 C (2.0 F) | 39 years | 20 of 100 (Routine) |
| 6 November 2012 | San Luis Ayucan, MX | daily low max | 15.0 C (59.0 F) | 1.1 C (2.0 F) | 50 years | 24 of 100 (Routine) |
| 25 October 2012 | San Luis Ayucan, MX | daily high max (Tie) | 25.0 C (77.0 F) | tie | 13 years | 2 of 100 (Routine) |
| 19 October 2012 | San Luis Ayucan, MX | daily high min (Tie) | 10.6 C (51.1 F) | tie | 32 years | 3 of 100 (Routine) |
| 15 October 2012 | San Luis Ayucan, MX | daily high min (Tie) | 10.0 C (50.0 F) | tie | 26 years | 3 of 100 (Routine) |
| 13 October 2012 | San Luis Ayucan, MX | daily high max (Tie) | 23.9 C (75.0 F) | tie | 29 years | 3 of 100 (Routine) |
| 5 October 2012 | San Luis Ayucan, MX | daily low min | 2.8 C (37.0 F) | 1.1 C (2.0 F) | 33 years | 18 of 100 (Routine) |
| 4 October 2012 | San Luis Ayucan, MX | daily low min (Tie) | 3.9 C (39.0 F) | tie | 1 year | 1 of 100 (Routine) |
| 24 June 2012 | San Luis Ayucan, MX | daily rain | 67.3 mm (2.6 in) | 23.9 mm (0.9 in) | 41 years | 36 of 100 (Notable) |
| 22 June 2012 | San Luis Ayucan, MX | monthly low min | 0.0 C (32.0 F) | 0.6 C (1.1 F) | 9 years | 20 of 100 (Routine) |
| 21 June 2012 | San Luis Ayucan, MX | daily low min | 3.3 C (37.9 F) | 2.3 C (4.1 F) | 28 years | 26 of 100 (Routine) |
| 20 June 2012 | San Luis Ayucan, MX | daily low min | 5.0 C (41.0 F) | 0.6 C (1.1 F) | 5 years | 9 of 100 (Routine) |
| 19 June 2012 | San Luis Ayucan, MX | daily low min (Tie) | 5.6 C (42.1 F) | tie | 26 years | 3 of 100 (Routine) |
| 2 June 2012 | San Luis Ayucan, MX | daily high max (Tie) | 26.7 C (80.1 F) | tie | 7 years | 1 of 100 (Routine) |
| 1 June 2012 | San Luis Ayucan, MX | daily high max | 27.2 C (81.0 F) | 0.5 C (0.9 F) | 10 years | 9 of 100 (Routine) |
Climate Trend
32 complete years, 1963 to 2011| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1963 | 13.1 C | -0.57 C |
| 1964 | 13.4 C | -0.29 C |
| 1965 | 13.2 C | -0.44 C |
| 1966 | 13.0 C | -0.73 C |
| 1967 | 13.2 C | -0.49 C |
| 1968 | 13.2 C | -0.53 C |
| 1969 | 14.2 C | +0.52 C |
| 1970 | 13.9 C | +0.20 C |
| 1971 | 13.8 C | +0.07 C |
| 1972 | 13.8 C | +0.14 C |
| 1973 | 14.0 C | +0.34 C |
| 1974 | 13.2 C | -0.44 C |
| 1975 | 13.2 C | -0.44 C |
| 1976 | 12.9 C | -0.75 C |
| 1977 | 13.4 C | -0.25 C |
| 1978 | 13.3 C | -0.34 C |
| 1979 | 13.5 C | -0.22 C |
| 1980 | 13.8 C | +0.08 C |
| 1981 | 13.5 C | -0.21 C |
| 1982 | 14.5 C | +0.84 C |
| 1983 | 13.9 C | +0.21 C |
| 1984 | 13.2 C | -0.44 C |
| 1985 | 13.2 C | -0.52 C |
| 1987 | 14.2 C | +0.47 C |
| 1997 | 13.5 C | -0.19 C |
| 1998 | 14.8 C | +1.09 C |
| 2001 | 13.6 C | -0.10 C |
| 2002 | 14.2 C | +0.51 C |
| 2007 | 14.4 C | +0.69 C |
| 2008 | 14.2 C | +0.47 C |
| 2009 | 14.3 C | +0.60 C |
| 2011 | 14.3 C | +0.60 C |
The annual mean temperature here has risen by 0.2 C (0.1 to 0.3) per decade over 1963 to 2011. In Fahrenheit: 0.4 F (0.2 to 0.6) 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 | 0.2 C (0.1 to 0.3) per decade | 0.4 F (0.2 to 0.6) per decade | 1963 to 2011 | 32 | Rise |
| Mean daily maximum | 0.3 C (0.2 to 0.5) per decade | 0.6 F (0.3 to 0.8) per decade | 1963 to 2011 | 32 | Rise |
| Mean daily minimum | 0.10 C (0.00 to 0.19) per decade | 0.17 F (0.01 to 0.34) per decade | 1963 to 2011 | 32 | 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
1961 to 2012| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 31.7 C (89.1 F) | 1998 | 28.3 C (82.9 F) | 43 |
| Coldest night (TNn) | -5.6 C (21.9 F) | 1968 | -1.7 C (28.9 F) | 43 |
| Wettest day (Rx1day) | 99.3 mm (3.9 in) | 1972 | 55.6 mm (2.2 in) | 43 |
| Wettest five days (Rx5day) | 201.2 mm (7.9 in) | 2008 | 119.9 mm (4.7 in) | 43 |
| Longest dry spell (CDD) | 111 days | 1998 | 39 days | 43 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1961 | 11.7 C (53.1 F) |
| 1962 | 26.1 C (79.0 F) |
| 1963 | 25.6 C (78.1 F) |
| 1964 | 27.2 C (81.0 F) |
| 1965 | 26.1 C (79.0 F) |
| 1966 | 26.7 C (80.1 F) |
| 1967 | 28.3 C (82.9 F) |
| 1968 | 25.6 C (78.1 F) |
| 1969 | 28.3 C (82.9 F) |
| 1970 | 29.4 C (84.9 F) |
| 1971 | 29.4 C (84.9 F) |
| 1972 | 27.2 C (81.0 F) |
| 1973 | 29.4 C (84.9 F) |
| 1974 | 28.9 C (84.0 F) |
| 1975 | 27.8 C (82.0 F) |
| 1976 | 25.0 C (77.0 F) |
| 1977 | 27.2 C (81.0 F) |
| 1978 | 30.6 C (87.1 F) |
| 1979 | 25.6 C (78.1 F) |
| 1980 | 26.7 C (80.1 F) |
| 1981 | 26.7 C (80.1 F) |
| 1982 | 28.9 C (84.0 F) |
| 1983 | 30.6 C (87.1 F) |
| 1984 | 27.8 C (82.0 F) |
| 1985 | 27.2 C (81.0 F) |
| 1986 | 27.8 C (82.0 F) |
| 1987 | 30.0 C (86.0 F) |
| 1996 | 27.8 C (82.0 F) |
| 1997 | 28.9 C (84.0 F) |
| 1998 | 31.7 C (89.1 F) |
| 1999 | 30.0 C (86.0 F) |
| 2001 | 28.9 C (84.0 F) |
| 2002 | 28.9 C (84.0 F) |
| 2003 | 30.0 C (86.0 F) |
| 2004 | 27.2 C (81.0 F) |
| 2005 | 31.7 C (89.1 F) |
| 2006 | 28.9 C (84.0 F) |
| 2007 | 28.9 C (84.0 F) |
| 2008 | 28.3 C (82.9 F) |
| 2009 | 28.3 C (82.9 F) |
| 2010 | 29.4 C (84.9 F) |
| 2011 | 28.9 C (84.0 F) |
| 2012 | 27.8 C (82.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1961 | 1.7 C (35.1 F) |
| 1962 | -1.7 C (28.9 F) |
| 1963 | -1.1 C (30.0 F) |
| 1964 | 0.6 C (33.1 F) |
| 1965 | -3.9 C (25.0 F) |
| 1966 | -5.0 C (23.0 F) |
| 1967 | -5.0 C (23.0 F) |
| 1968 | -5.6 C (21.9 F) |
| 1969 | -3.3 C (26.1 F) |
| 1970 | -5.0 C (23.0 F) |
| 1971 | -1.7 C (28.9 F) |
| 1972 | -5.0 C (23.0 F) |
| 1973 | -2.2 C (28.0 F) |
| 1974 | -1.7 C (28.9 F) |
| 1975 | -5.0 C (23.0 F) |
| 1976 | -2.2 C (28.0 F) |
| 1977 | 0.0 C (32.0 F) |
| 1978 | -3.3 C (26.1 F) |
| 1979 | -1.1 C (30.0 F) |
| 1980 | 0.0 C (32.0 F) |
| 1981 | 0.0 C (32.0 F) |
| 1982 | -1.7 C (28.9 F) |
| 1983 | -3.3 C (26.1 F) |
| 1984 | -2.2 C (28.0 F) |
| 1985 | -2.2 C (28.0 F) |
| 1986 | -2.2 C (28.0 F) |
| 1987 | 0.0 C (32.0 F) |
| 1996 | 0.0 C (32.0 F) |
| 1997 | -5.0 C (23.0 F) |
| 1998 | -1.1 C (30.0 F) |
| 1999 | -3.3 C (26.1 F) |
| 2001 | 0.0 C (32.0 F) |
| 2002 | -3.3 C (26.1 F) |
| 2003 | 0.0 C (32.0 F) |
| 2004 | 0.6 C (33.1 F) |
| 2005 | 0.0 C (32.0 F) |
| 2006 | 0.0 C (32.0 F) |
| 2007 | 0.0 C (32.0 F) |
| 2008 | -4.4 C (24.1 F) |
| 2009 | 0.6 C (33.1 F) |
| 2010 | 0.6 C (33.1 F) |
| 2011 | 0.0 C (32.0 F) |
| 2012 | 0.0 C (32.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1961 | 72.4 mm (2.9 in) |
| 1962 | 48.0 mm (1.9 in) |
| 1963 | 54.1 mm (2.1 in) |
| 1964 | 30.7 mm (1.2 in) |
| 1965 | 93.5 mm (3.7 in) |
| 1966 | 40.4 mm (1.6 in) |
| 1967 | 71.1 mm (2.8 in) |
| 1968 | 74.7 mm (2.9 in) |
| 1969 | 55.6 mm (2.2 in) |
| 1970 | 41.4 mm (1.6 in) |
| 1971 | 51.6 mm (2.0 in) |
| 1972 | 99.3 mm (3.9 in) |
| 1973 | 59.9 mm (2.4 in) |
| 1974 | 68.1 mm (2.7 in) |
| 1975 | 50.0 mm (2.0 in) |
| 1976 | 63.5 mm (2.5 in) |
| 1977 | 48.0 mm (1.9 in) |
| 1978 | 51.3 mm (2.0 in) |
| 1979 | 52.3 mm (2.1 in) |
| 1980 | 82.6 mm (3.3 in) |
| 1981 | 56.6 mm (2.2 in) |
| 1982 | 33.3 mm (1.3 in) |
| 1983 | 40.4 mm (1.6 in) |
| 1984 | 48.3 mm (1.9 in) |
| 1985 | 54.6 mm (2.1 in) |
| 1986 | 67.8 mm (2.7 in) |
| 1987 | 87.4 mm (3.4 in) |
| 1996 | 30.2 mm (1.2 in) |
| 1997 | 42.7 mm (1.7 in) |
| 1998 | 66.3 mm (2.6 in) |
| 1999 | 62.0 mm (2.4 in) |
| 2001 | 39.9 mm (1.6 in) |
| 2002 | 42.2 mm (1.7 in) |
| 2003 | 65.0 mm (2.6 in) |
| 2004 | 62.7 mm (2.5 in) |
| 2005 | 54.1 mm (2.1 in) |
| 2006 | 56.9 mm (2.2 in) |
| 2007 | 39.9 mm (1.6 in) |
| 2008 | 93.0 mm (3.7 in) |
| 2009 | 61.5 mm (2.4 in) |
| 2010 | 52.8 mm (2.1 in) |
| 2011 | 73.9 mm (2.9 in) |
| 2012 | 67.3 mm (2.6 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1961 | 128.4 mm (5.1 in) |
| 1962 | 97.6 mm (3.8 in) |
| 1963 | 118.7 mm (4.7 in) |
| 1964 | 70.1 mm (2.8 in) |
| 1965 | 138.8 mm (5.5 in) |
| 1966 | 103.2 mm (4.1 in) |
| 1967 | 137.7 mm (5.4 in) |
| 1968 | 89.2 mm (3.5 in) |
| 1969 | 169.2 mm (6.7 in) |
| 1970 | 108.0 mm (4.3 in) |
| 1971 | 95.7 mm (3.8 in) |
| 1972 | 185.5 mm (7.3 in) |
| 1973 | 127.0 mm (5.0 in) |
| 1974 | 145.1 mm (5.7 in) |
| 1975 | 93.0 mm (3.7 in) |
| 1976 | 120.4 mm (4.7 in) |
| 1977 | 103.4 mm (4.1 in) |
| 1978 | 102.4 mm (4.0 in) |
| 1979 | 134.9 mm (5.3 in) |
| 1980 | 113.7 mm (4.5 in) |
| 1981 | 142.7 mm (5.6 in) |
| 1982 | 76.9 mm (3.0 in) |
| 1983 | 143.1 mm (5.6 in) |
| 1984 | 134.1 mm (5.3 in) |
| 1985 | 102.9 mm (4.1 in) |
| 1986 | 116.1 mm (4.6 in) |
| 1987 | 143.8 mm (5.7 in) |
| 1996 | 63.5 mm (2.5 in) |
| 1997 | 109.0 mm (4.3 in) |
| 1998 | 103.4 mm (4.1 in) |
| 1999 | 127.6 mm (5.0 in) |
| 2001 | 115.8 mm (4.6 in) |
| 2002 | 119.9 mm (4.7 in) |
| 2003 | 132.8 mm (5.2 in) |
| 2004 | 106.4 mm (4.2 in) |
| 2005 | 100.3 mm (3.9 in) |
| 2006 | 162.3 mm (6.4 in) |
| 2007 | 85.2 mm (3.4 in) |
| 2008 | 201.2 mm (7.9 in) |
| 2009 | 138.2 mm (5.4 in) |
| 2010 | 146.6 mm (5.8 in) |
| 2011 | 160.5 mm (6.3 in) |
| 2012 | 124.7 mm (4.9 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1961 | 22 days |
| 1962 | 76 days |
| 1963 | 65 days |
| 1964 | 41 days |
| 1965 | 31 days |
| 1966 | 35 days |
| 1967 | 44 days |
| 1968 | 26 days |
| 1969 | 34 days |
| 1970 | 56 days |
| 1971 | 61 days |
| 1972 | 29 days |
| 1973 | 47 days |
| 1974 | 39 days |
| 1975 | 65 days |
| 1976 | 31 days |
| 1977 | 30 days |
| 1978 | 28 days |
| 1979 | 39 days |
| 1980 | 34 days |
| 1981 | 33 days |
| 1982 | 51 days |
| 1983 | 37 days |
| 1984 | 31 days |
| 1985 | 26 days |
| 1986 | 104 days |
| 1987 | 64 days |
| 1996 | 32 days |
| 1997 | 53 days |
| 1998 | 111 days |
| 1999 | 74 days |
| 2001 | 47 days |
| 2002 | 43 days |
| 2003 | 34 days |
| 2004 | 58 days |
| 2005 | 30 days |
| 2006 | 39 days |
| 2007 | 38 days |
| 2008 | 66 days |
| 2009 | 35 days |
| 2010 | 46 days |
| 2011 | 43 days |
| 2012 | 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.
Frost Dates and Growing Season
20 years with a frostAcross 20 years with a frost, the median last spring frost at San Luis Ayucan falls on 5 February and the median first autumn frost on 17 November, which leaves a median of 285 days between them.
| Measure | Median, all years | Earliest period | Recent period (1963 to 2008) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 5 February | n/a | 5 February | n/a | n/a |
| First autumn frost | 17 November | n/a | 17 November | n/a | n/a |
| Growing days | 285 days | n/a | 285 days | n/a | n/a |
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
39 years, 1961 to 2011A day with at least 56.3 mm (2.2 in) of rain is expected about once in 2 years. A day with at least 111.3 mm (4.4 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 56.3 mm (2.2 in) | |
| 5 years | 71.9 mm (2.8 in) | |
| 10 years | 81.9 mm (3.2 in) | |
| 25 years | 94.0 mm (3.7 in) | |
| 50 years | 102.8 mm (4.0 in) | Longer than the 39 years of record |
| 100 years | 111.3 mm (4.4 in) | Longer than the 39 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, 39 years of values from 1961 to 2011.
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: 99.3 mm (3.9 in) in 1972; 93.5 mm (3.7 in) in 1965; 93.0 mm (3.7 in) in 2008.
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).