San Isidro Weather Records (MXN00001024)
Record envelope, standing records and threshold days for San Isidro (MXN00001024), Mexico, with 47 years of record.
Key Facts for San Isidro
- San Isidro (MXN00001024) is a weather station in Mexico at 21.77 latitude and -102.10 longitude, 2,004 m (6,576 ft) above sea level.
- The station reports from 1967 to 2013, 47 years of record.
- 1,464 records set at San Isidro still stand.
- Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
- San Isidro tied a daily record high minimum temperature of 13.9 C (57.0 F) on 24 September 2013.
About the Station
- Location: Mexico, 21.77 latitude, -102.10 longitude.
- Elevation: 2,004 m (6,576 ft).
- Period of record: 1967 to 2013, 47 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 | 30.6 C (87.1 F) | -6.1 C (21.0 F) | n/a | n/a |
| Mar | 32.8 C (91.0 F) | -3.3 C (26.1 F) | n/a | n/a |
| Apr | 36.7 C (98.1 F) | -1.1 C (30.0 F) | n/a | n/a |
| May | 36.7 C (98.1 F) | 2.8 C (37.0 F) | n/a | n/a |
| Jun | 35.6 C (96.1 F) | 5.0 C (41.0 F) | n/a | n/a |
| Jul | 35.6 C (96.1 F) | 5.0 C (41.0 F) | n/a | n/a |
| Aug | 35.0 C (95.0 F) | 6.7 C (44.1 F) | n/a | n/a |
| Sep | 32.8 C (91.0 F) | 2.8 C (37.0 F) | n/a | n/a |
| Oct | 31.7 C (89.1 F) | 0.0 C (32.0 F) | n/a | n/a |
| Nov | 31.7 C (89.1 F) | -6.1 C (21.0 F) | n/a | n/a |
| Dec | 28.9 C (84.0 F) | -6.1 C (21.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1968 | 4 |
| 1970 | 41 |
| 1971 | 46 |
| 1972 | 43 |
| 1973 | 47 |
| 1974 | 34 |
| 1975 | 54 |
| 1976 | 42 |
| 1977 | 28 |
| 1978 | 33 |
| 1979 | 32 |
| 1980 | 13 |
| 1981 | 12 |
| 1982 | 19 |
| 1983 | 38 |
| 1984 | 31 |
| 1985 | 32 |
| 1986 | 53 |
| 1987 | 35 |
| 1988 | 58 |
| 1989 | 56 |
| 1990 | 31 |
| 1991 | 17 |
| 1992 | 42 |
| 1993 | 23 |
| 1994 | 10 |
| 1995 | 33 |
| 1996 | 8 |
| 1997 | 13 |
| 1998 | 24 |
| 1999 | 8 |
| 2000 | 72 |
| 2001 | 58 |
| 2002 | 72 |
| 2003 | 121 |
| 2004 | 14 |
| 2005 | 27 |
| 2006 | 12 |
| 2007 | 18 |
| 2008 | 69 |
| 2009 | 12 |
| 2010 | 16 |
| 2011 | 5 |
| 2012 | 7 |
| 2013 | 1 |
All-Time Record Progression
4 new records| Date | Kind | Detail |
|---|---|---|
| 2001-04-17 | Record high maximum temperature | Record high maximum temperature 36.7 C (98.1 F) |
| 2001-07-31 | Record high minimum temperature | Record high minimum temperature 18.9 C (66.0 F) |
| 2005-06-30 | Record high minimum temperature | Record high minimum temperature 20.0 C (68.0 F) |
| 2007-06-26 | Record daily precipitation | Record daily precipitation 90.4 mm (3.6 in) |
Wettest Day of Each Month
Jun: 90.4 mm (3.6 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 40.9 mm (1.6 in) | 1 January 2013 |
| Feb | 45.0 mm (1.8 in) | 23 February 1970 |
| Mar | 14.2 mm (0.6 in) | 21 March 1997 |
| Apr | 19.8 mm (0.8 in) | 19 April 1994 |
| May | 48.8 mm (1.9 in) | 25 May 1971 |
| Jun | 90.4 mm (3.6 in) | 26 June 2007 |
| Jul | 68.8 mm (2.7 in) | 7 July 1985 |
| Aug | 79.0 mm (3.1 in) | 24 August 1992 |
| Sep | 75.2 mm (3.0 in) | 22 September 1967 |
| Oct | 54.4 mm (2.1 in) | 9 October 1992 |
| Nov | 48.3 mm (1.9 in) | 14 November 1992 |
| Dec | 42.9 mm (1.7 in) | 10 December 2006 |
Period of Record Coverage
1968 to 2013| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1968 | 7 | 2% | No |
| 1970 | 147 | 40% | No |
| 1971 | 337 | 92% | Yes |
| 1972 | 336 | 92% | Yes |
| 1973 | 365 | 100% | Yes |
| 1974 | 365 | 100% | Yes |
| 1975 | 359 | 98% | Yes |
| 1976 | 304 | 83% | No |
| 1977 | 365 | 100% | Yes |
| 1978 | 365 | 100% | Yes |
| 1979 | 365 | 100% | Yes |
| 1980 | 245 | 67% | No |
| 1981 | 247 | 68% | No |
| 1982 | 303 | 83% | No |
| 1983 | 364 | 100% | Yes |
| 1984 | 366 | 100% | Yes |
| 1985 | 365 | 100% | Yes |
| 1986 | 365 | 100% | Yes |
| 1987 | 364 | 100% | Yes |
| 1988 | 366 | 100% | Yes |
| 1989 | 365 | 100% | Yes |
| 1990 | 357 | 98% | Yes |
| 1991 | 365 | 100% | Yes |
| 1992 | 366 | 100% | Yes |
| 1993 | 365 | 100% | Yes |
| 1994 | 365 | 100% | Yes |
| 1995 | 365 | 100% | Yes |
| 1996 | 366 | 100% | Yes |
| 1997 | 365 | 100% | Yes |
| 1998 | 365 | 100% | Yes |
| 1999 | 365 | 100% | Yes |
| 2000 | 366 | 100% | Yes |
| 2001 | 272 | 75% | No |
| 2002 | 365 | 100% | Yes |
| 2003 | 365 | 100% | Yes |
| 2004 | 366 | 100% | Yes |
| 2005 | 365 | 100% | Yes |
| 2006 | 365 | 100% | Yes |
| 2007 | 365 | 100% | Yes |
| 2008 | 366 | 100% | Yes |
| 2009 | 365 | 100% | Yes |
| 2010 | 365 | 100% | Yes |
| 2011 | 358 | 98% | Yes |
| 2012 | 349 | 95% | Yes |
| 2013 | 273 | 75% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 24 September 2013 | San Isidro, MX | daily high min (Tie) | 13.9 C (57.0 F) | tie | 40 years | 4 of 100 (Routine) |
| 15 September 2013 | San Isidro, MX | daily low max (Tie) | 20.0 C (68.0 F) | tie | 27 years | 3 of 100 (Routine) |
| 8 August 2013 | San Isidro, MX | daily high min | 15.6 C (60.1 F) | 0.6 C (1.1 F) | 43 years | 19 of 100 (Routine) |
| 9 May 2013 | San Isidro, MX | daily low min (Tie) | 6.7 C (44.1 F) | tie | 40 years | 4 of 100 (Routine) |
| 7 May 2013 | San Isidro, MX | daily low min (Tie) | 6.7 C (44.1 F) | tie | 34 years | 3 of 100 (Routine) |
| 1 May 2013 | San Isidro, MX | daily low min (Tie) | 5.0 C (41.0 F) | tie | 15 years | 2 of 100 (Routine) |
| 26 April 2013 | San Isidro, MX | daily low min (Tie) | 5.6 C (42.1 F) | tie | 36 years | 3 of 100 (Routine) |
| 1 January 2013 | San Isidro, MX | monthly rain | 40.9 mm (1.6 in) | 1.0 mm (0.04 in) | 10 years | 18 of 100 (Routine) |
| 31 December 2012 | San Isidro, MX | daily rain | 10.9 mm (0.4 in) | 9.1 mm (0.36 in) | 41 years | 20 of 100 (Routine) |
| 2 October 2012 | San Isidro, MX | daily low min (Tie) | 2.8 C (37.0 F) | tie | 4 years | 1 of 100 (Routine) |
| 1 October 2012 | San Isidro, MX | daily low min (Tie) | 3.9 C (39.0 F) | tie | 33 years | 3 of 100 (Routine) |
| 19 August 2012 | San Isidro, MX | daily rain | 19.8 mm (0.8 in) | 0.7 mm (0.03 in) | 23 years | 10 of 100 (Routine) |
| 2 August 2012 | San Isidro, MX | daily rain | 40.9 mm (1.6 in) | 9.1 mm (0.36 in) | 41 years | 24 of 100 (Routine) |
| 1 July 2012 | San Isidro, MX | daily rain | 40.9 mm (1.6 in) | 16.0 mm (0.6 in) | 9 years | 21 of 100 (Routine) |
| 27 June 2012 | San Isidro, MX | daily low max (Tie) | 22.8 C (73.0 F) | tie | 41 years | 4 of 100 (Routine) |
| 29 February 2012 | San Isidro, MX | daily low max | 20.6 C (69.1 F) | 1.1 C (2.0 F) | 20 years | 13 of 100 (Routine) |
| 25 February 2012 | San Isidro, MX | daily high min | 10.0 C (50.0 F) | 0.6 C (1.1 F) | 13 years | 10 of 100 (Routine) |
| 24 February 2012 | San Isidro, MX | daily high min (Tie) | 10.0 C (50.0 F) | tie | 13 years | 2 of 100 (Routine) |
| 22 February 2012 | San Isidro, MX | daily high min (Tie) | 10.0 C (50.0 F) | tie | 38 years | 3 of 100 (Routine) |
| 16 February 2012 | San Isidro, MX | daily low max | 15.0 C (59.0 F) | 1.7 C (3.1 F) | 40 years | 21 of 100 (Routine) |
Climate Trend
34 complete years, 1973 to 2011| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1973 | 16.5 C | +0.09 C |
| 1974 | 16.3 C | -0.13 C |
| 1975 | 15.5 C | -0.94 C |
| 1977 | 16.2 C | -0.27 C |
| 1978 | 15.9 C | -0.52 C |
| 1979 | 16.1 C | -0.34 C |
| 1983 | 15.6 C | -0.87 C |
| 1984 | 15.5 C | -0.90 C |
| 1985 | 15.8 C | -0.69 C |
| 1986 | 15.6 C | -0.89 C |
| 1987 | 16.0 C | -0.42 C |
| 1988 | 15.1 C | -1.31 C |
| 1989 | 15.2 C | -1.21 C |
| 1990 | 15.7 C | -0.72 C |
| 1991 | 15.9 C | -0.52 C |
| 1992 | 15.4 C | -1.00 C |
| 1993 | 15.9 C | -0.50 C |
| 1994 | 16.8 C | +0.39 C |
| 1995 | 16.6 C | +0.15 C |
| 1996 | 16.4 C | -0.03 C |
| 1997 | 16.1 C | -0.34 C |
| 1998 | 16.8 C | +0.36 C |
| 1999 | 16.2 C | -0.28 C |
| 2000 | 17.9 C | +1.46 C |
| 2002 | 17.8 C | +1.36 C |
| 2003 | 19.0 C | +2.55 C |
| 2004 | 16.9 C | +0.50 C |
| 2005 | 17.7 C | +1.22 C |
| 2006 | 17.4 C | +0.95 C |
| 2007 | 17.3 C | +0.85 C |
| 2008 | 17.7 C | +1.21 C |
| 2009 | 16.8 C | +0.31 C |
| 2010 | 16.1 C | -0.36 C |
| 2011 | 17.3 C | +0.83 C |
The annual mean temperature here has risen by 0.5 C (0.3 to 0.7) per decade over 1973 to 2011. In Fahrenheit: 0.9 F (0.5 to 1.3) per decade. The slope is a straight line fitted to 34 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.5 C (0.3 to 0.7) per decade | 0.9 F (0.5 to 1.3) per decade | 1973 to 2011 | 34 | Rise |
| Mean daily maximum | 0.7 C (0.3 to 1.0) per decade | 1.2 F (0.6 to 1.8) per decade | 1973 to 2011 | 34 | Rise |
| Mean daily minimum | 0.3 C (0.1 to 0.5) per decade | 0.6 F (0.1 to 1.0) per decade | 1973 to 2011 | 34 | 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
1967 to 2013| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 36.7 C (98.1 F) | 2001 | 32.8 C (91.0 F) | 45 |
| Coldest night (TNn) | -6.1 C (21.0 F) | 1970 | -3.3 C (26.1 F) | 44 |
| Wettest day (Rx1day) | 90.4 mm (3.6 in) | 2007 | 40.9 mm (1.6 in) | 47 |
| Wettest five days (Rx5day) | 195.4 mm (7.7 in) | 1967 | 77.9 mm (3.1 in) | 47 |
| Longest dry spell (CDD) | 171 days | 2011 | 92 days | 47 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1967 | n/a |
| 1968 | 35.6 C (96.1 F) |
| 1969 | n/a |
| 1970 | 28.9 C (84.0 F) |
| 1971 | 33.9 C (93.0 F) |
| 1972 | 35.0 C (95.0 F) |
| 1973 | 35.0 C (95.0 F) |
| 1974 | 33.9 C (93.0 F) |
| 1975 | 31.7 C (89.1 F) |
| 1976 | 32.8 C (91.0 F) |
| 1977 | 32.8 C (91.0 F) |
| 1978 | 32.8 C (91.0 F) |
| 1979 | 30.6 C (87.1 F) |
| 1980 | 32.8 C (91.0 F) |
| 1981 | 30.0 C (86.0 F) |
| 1982 | 33.9 C (93.0 F) |
| 1983 | 32.2 C (90.0 F) |
| 1984 | 31.7 C (89.1 F) |
| 1985 | 32.8 C (91.0 F) |
| 1986 | 33.9 C (93.0 F) |
| 1987 | 31.7 C (89.1 F) |
| 1988 | 32.8 C (91.0 F) |
| 1989 | 35.6 C (96.1 F) |
| 1990 | 33.9 C (93.0 F) |
| 1991 | 33.3 C (91.9 F) |
| 1992 | 31.7 C (89.1 F) |
| 1993 | 32.8 C (91.0 F) |
| 1994 | 31.7 C (89.1 F) |
| 1995 | 31.7 C (89.1 F) |
| 1996 | 32.8 C (91.0 F) |
| 1997 | 31.7 C (89.1 F) |
| 1998 | 33.9 C (93.0 F) |
| 1999 | 31.7 C (89.1 F) |
| 2000 | 32.8 C (91.0 F) |
| 2001 | 36.7 C (98.1 F) |
| 2002 | 35.6 C (96.1 F) |
| 2003 | 36.7 C (98.1 F) |
| 2004 | 33.9 C (93.0 F) |
| 2005 | 35.6 C (96.1 F) |
| 2006 | 33.9 C (93.0 F) |
| 2007 | 35.0 C (95.0 F) |
| 2008 | 36.7 C (98.1 F) |
| 2009 | 32.8 C (91.0 F) |
| 2010 | 32.8 C (91.0 F) |
| 2011 | 32.8 C (91.0 F) |
| 2012 | 31.7 C (89.1 F) |
| 2013 | 31.7 C (89.1 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1967 | n/a |
| 1968 | n/a |
| 1969 | n/a |
| 1970 | -6.1 C (21.0 F) |
| 1971 | -2.2 C (28.0 F) |
| 1972 | -6.1 C (21.0 F) |
| 1973 | -6.1 C (21.0 F) |
| 1974 | -4.4 C (24.1 F) |
| 1975 | -5.0 C (23.0 F) |
| 1976 | -3.3 C (26.1 F) |
| 1977 | -2.2 C (28.0 F) |
| 1978 | -5.0 C (23.0 F) |
| 1979 | -2.2 C (28.0 F) |
| 1980 | 0.0 C (32.0 F) |
| 1981 | -2.2 C (28.0 F) |
| 1982 | -3.3 C (26.1 F) |
| 1983 | -4.4 C (24.1 F) |
| 1984 | -3.3 C (26.1 F) |
| 1985 | -3.3 C (26.1 F) |
| 1986 | -3.3 C (26.1 F) |
| 1987 | 0.0 C (32.0 F) |
| 1988 | -4.4 C (24.1 F) |
| 1989 | -4.4 C (24.1 F) |
| 1990 | 0.0 C (32.0 F) |
| 1991 | -3.3 C (26.1 F) |
| 1992 | 0.0 C (32.0 F) |
| 1993 | 0.0 C (32.0 F) |
| 1994 | -2.2 C (28.0 F) |
| 1995 | 0.6 C (33.1 F) |
| 1996 | 0.0 C (32.0 F) |
| 1997 | -6.1 C (21.0 F) |
| 1998 | -2.2 C (28.0 F) |
| 1999 | -4.4 C (24.1 F) |
| 2000 | -5.0 C (23.0 F) |
| 2001 | -2.2 C (28.0 F) |
| 2002 | -3.3 C (26.1 F) |
| 2003 | -2.2 C (28.0 F) |
| 2004 | -3.3 C (26.1 F) |
| 2005 | -2.2 C (28.0 F) |
| 2006 | -6.1 C (21.0 F) |
| 2007 | -5.0 C (23.0 F) |
| 2008 | -3.3 C (26.1 F) |
| 2009 | -2.2 C (28.0 F) |
| 2010 | -6.1 C (21.0 F) |
| 2011 | -2.2 C (28.0 F) |
| 2012 | 0.0 C (32.0 F) |
| 2013 | 0.0 C (32.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1967 | 75.2 mm (3.0 in) |
| 1968 | 24.1 mm (0.9 in) |
| 1969 | 38.9 mm (1.5 in) |
| 1970 | 45.0 mm (1.8 in) |
| 1971 | 48.8 mm (1.9 in) |
| 1972 | 38.9 mm (1.5 in) |
| 1973 | 39.9 mm (1.6 in) |
| 1974 | 31.8 mm (1.3 in) |
| 1975 | 62.0 mm (2.4 in) |
| 1976 | 59.9 mm (2.4 in) |
| 1977 | 39.9 mm (1.6 in) |
| 1978 | 46.0 mm (1.8 in) |
| 1979 | 59.9 mm (2.4 in) |
| 1980 | 19.8 mm (0.8 in) |
| 1981 | 18.8 mm (0.7 in) |
| 1982 | 30.0 mm (1.2 in) |
| 1983 | 36.8 mm (1.4 in) |
| 1984 | 36.8 mm (1.4 in) |
| 1985 | 68.8 mm (2.7 in) |
| 1986 | 63.0 mm (2.5 in) |
| 1987 | 47.8 mm (1.9 in) |
| 1988 | 50.8 mm (2.0 in) |
| 1989 | 25.9 mm (1.0 in) |
| 1990 | 49.8 mm (2.0 in) |
| 1991 | 45.5 mm (1.8 in) |
| 1992 | 79.0 mm (3.1 in) |
| 1993 | 37.8 mm (1.5 in) |
| 1994 | 37.6 mm (1.5 in) |
| 1995 | 42.7 mm (1.7 in) |
| 1996 | 32.3 mm (1.3 in) |
| 1997 | 20.6 mm (0.8 in) |
| 1998 | 45.0 mm (1.8 in) |
| 1999 | 76.7 mm (3.0 in) |
| 2000 | 49.3 mm (1.9 in) |
| 2001 | 41.1 mm (1.6 in) |
| 2002 | 39.9 mm (1.6 in) |
| 2003 | 34.8 mm (1.4 in) |
| 2004 | 35.6 mm (1.4 in) |
| 2005 | 46.0 mm (1.8 in) |
| 2006 | 42.9 mm (1.7 in) |
| 2007 | 90.4 mm (3.6 in) |
| 2008 | 32.8 mm (1.3 in) |
| 2009 | 55.1 mm (2.2 in) |
| 2010 | 37.8 mm (1.5 in) |
| 2011 | 36.3 mm (1.4 in) |
| 2012 | 40.9 mm (1.6 in) |
| 2013 | 40.9 mm (1.6 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1967 | 195.4 mm (7.7 in) |
| 1968 | 59.5 mm (2.3 in) |
| 1969 | 69.4 mm (2.7 in) |
| 1970 | 98.0 mm (3.9 in) |
| 1971 | 83.9 mm (3.3 in) |
| 1972 | 84.9 mm (3.3 in) |
| 1973 | 93.2 mm (3.7 in) |
| 1974 | 72.2 mm (2.8 in) |
| 1975 | 163.9 mm (6.5 in) |
| 1976 | 125.5 mm (4.9 in) |
| 1977 | 86.4 mm (3.4 in) |
| 1978 | 95.8 mm (3.8 in) |
| 1979 | 104.4 mm (4.1 in) |
| 1980 | 39.6 mm (1.6 in) |
| 1981 | 36.6 mm (1.4 in) |
| 1982 | 49.6 mm (2.0 in) |
| 1983 | 63.5 mm (2.5 in) |
| 1984 | 70.0 mm (2.8 in) |
| 1985 | 78.7 mm (3.1 in) |
| 1986 | 132.3 mm (5.2 in) |
| 1987 | 69.1 mm (2.7 in) |
| 1988 | 121.3 mm (4.8 in) |
| 1989 | 42.1 mm (1.7 in) |
| 1990 | 75.5 mm (3.0 in) |
| 1991 | 147.6 mm (5.8 in) |
| 1992 | 114.5 mm (4.5 in) |
| 1993 | 67.8 mm (2.7 in) |
| 1994 | 56.9 mm (2.2 in) |
| 1995 | 80.5 mm (3.2 in) |
| 1996 | 87.8 mm (3.5 in) |
| 1997 | 41.7 mm (1.6 in) |
| 1998 | 72.7 mm (2.9 in) |
| 1999 | 87.6 mm (3.4 in) |
| 2000 | 64.6 mm (2.5 in) |
| 2001 | 77.9 mm (3.1 in) |
| 2002 | 51.3 mm (2.0 in) |
| 2003 | 90.2 mm (3.6 in) |
| 2004 | 50.9 mm (2.0 in) |
| 2005 | 81.0 mm (3.2 in) |
| 2006 | 55.9 mm (2.2 in) |
| 2007 | 118.1 mm (4.6 in) |
| 2008 | 51.6 mm (2.0 in) |
| 2009 | 66.0 mm (2.6 in) |
| 2010 | 86.7 mm (3.4 in) |
| 2011 | 56.4 mm (2.2 in) |
| 2012 | 78.3 mm (3.1 in) |
| 2013 | 65.1 mm (2.6 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1967 | 47 days |
| 1968 | 96 days |
| 1969 | 127 days |
| 1970 | 97 days |
| 1971 | 85 days |
| 1972 | 40 days |
| 1973 | 75 days |
| 1974 | 55 days |
| 1975 | 150 days |
| 1976 | 91 days |
| 1977 | 82 days |
| 1978 | 85 days |
| 1979 | 112 days |
| 1980 | 51 days |
| 1981 | 36 days |
| 1982 | 76 days |
| 1983 | 127 days |
| 1984 | 128 days |
| 1985 | 77 days |
| 1986 | 155 days |
| 1987 | 53 days |
| 1988 | 65 days |
| 1989 | 108 days |
| 1990 | 67 days |
| 1991 | 112 days |
| 1992 | 67 days |
| 1993 | 82 days |
| 1994 | 90 days |
| 1995 | 89 days |
| 1996 | 113 days |
| 1997 | 50 days |
| 1998 | 159 days |
| 1999 | 156 days |
| 2000 | 142 days |
| 2001 | 104 days |
| 2002 | 89 days |
| 2003 | 111 days |
| 2004 | 92 days |
| 2005 | 117 days |
| 2006 | 106 days |
| 2007 | 109 days |
| 2008 | 92 days |
| 2009 | 58 days |
| 2010 | 113 days |
| 2011 | 171 days |
| 2012 | 75 days |
| 2013 | 130 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 San Isidro falls on 22 February and the median first autumn frost on 28 November, which leaves a median of 282 days between them.
Fitted over all years, the growing season changes by +9.6 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1973 to 2011) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 22 February | n/a | 22 February | n/a | -7.6 days per decade |
| First autumn frost | 28 November | n/a | 28 November | n/a | +2.0 days per decade |
| Growing days | 282 days | n/a | 282 days | n/a | +9.6 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
41 years, 1968 to 2012A day with at least 42.0 mm (1.7 in) of rain is expected about once in 2 years. A day with at least 97.6 mm (3.8 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 42.0 mm (1.7 in) | |
| 5 years | 54.5 mm (2.1 in) | |
| 10 years | 63.7 mm (2.5 in) | |
| 25 years | 76.3 mm (3.0 in) | |
| 50 years | 86.6 mm (3.4 in) | Longer than the 41 years of record |
| 100 years | 97.6 mm (3.8 in) | Longer than the 41 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, 41 years of values from 1968 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: 90.4 mm (3.6 in) in 2007; 79.0 mm (3.1 in) in 1992; 76.7 mm (3.0 in) in 1999.
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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).