Palo Alto Threshold Days by Year (MXN00001015)
8 fixed thresholds counted per year at Palo Alto (MXN00001015): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Palo Alto Thresholds
- Palo Alto: days with 10 mm (0.39 in) or more of precipitation in 45 years, most in 2004 with 28.
- Palo Alto: days with 25 mm (0.98 in) or more of precipitation in 44 years, most in 1992 with 10.
- Palo Alto: days with a maximum temperature at or above 30 C (86 F) in 42 years, most in 2009 with 207.
- Palo Alto: nights with a minimum temperature at or below 0 C (32 F) in 42 years, most in 2010 with 51.
- 8 fixed thresholds have at least one qualifying day at Palo Alto.
Days at or above 30 C (86 F)
42 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1971 | 69 | 67.1 |
| 1972 | 98 | 67.1 |
| 1973 | 79 | 67.1 |
| 1974 | 92 | 67.1 |
| 1975 | 91 | 67.1 |
| 1976 | 71 | 67.1 |
| 1977 | 19 | 67.1 |
| 1978 | 36 | 67.1 |
| 1979 | 49 | 67.1 |
| 1980 | 94 | 55 |
| 1981 | 37 | 55 |
| 1982 | 81 | 55 |
| 1983 | 63 | 55 |
| 1984 | 43 | 55 |
| 1985 | 32 | 55 |
| 1986 | 54 | 55 |
| 1987 | 39 | 55 |
| 1988 | 55 | 55 |
| 1989 | 52 | 55 |
| 1990 | 52 | 72.5 |
| 1991 | 88 | 72.5 |
| 1992 | 16 | 72.5 |
| 1993 | 30 | 72.5 |
| 1994 | 74 | 72.5 |
| 1995 | 78 | 72.5 |
| 1996 | 102 | 72.5 |
| 1997 | 79 | 72.5 |
| 1998 | 113 | 72.5 |
| 1999 | 93 | 72.5 |
| 2000 | 107 | 105.2 |
| 2001 | 91 | 105.2 |
| 2002 | 90 | 105.2 |
| 2003 | 104 | 105.2 |
| 2004 | 70 | 105.2 |
| 2005 | 109 | 105.2 |
| 2006 | 109 | 105.2 |
| 2007 | 82 | 105.2 |
| 2008 | 83 | 105.2 |
| 2009 | 207 | 105.2 |
| 2010 | 69 | 104 |
| 2011 | 132 | 104 |
| 2012 | 111 | 104 |
| Year | First date | Last date |
|---|---|---|
| 1971 | 1971-03-19 | 1971-11-21 |
| 1972 | 1972-02-23 | 1972-12-10 |
| 1973 | 1973-02-03 | 1973-11-08 |
| 1974 | 1974-03-02 | 1974-09-28 |
| 1975 | 1975-03-06 | 1975-11-01 |
| 1976 | 1976-02-14 | 1976-09-19 |
| 1977 | 1977-03-15 | 1977-06-11 |
| 1978 | 1978-03-31 | 1978-07-16 |
| 1979 | 1979-03-14 | 1979-10-22 |
| 1980 | 1980-03-09 | 1980-10-02 |
| 1981 | 1981-04-01 | 1981-08-17 |
| 1982 | 1982-04-01 | 1982-09-30 |
| 1983 | 1983-04-01 | 1983-06-29 |
| 1984 | 1984-03-29 | 1984-06-28 |
| 1985 | 1985-03-18 | 1985-06-15 |
| 1986 | 1986-02-19 | 1986-11-20 |
| 1987 | 1987-04-15 | 1987-10-01 |
| 1988 | 1988-03-25 | 1988-06-26 |
| 1989 | 1989-03-18 | 1989-07-18 |
| 1990 | 1990-04-04 | 1990-06-28 |
| 1991 | 1991-03-06 | 1991-06-27 |
| 1992 | 1992-05-02 | 1992-07-15 |
| 1993 | 1993-04-26 | 1993-07-31 |
| 1994 | 1994-03-20 | 1994-11-14 |
| 1995 | 1995-03-27 | 1995-12-05 |
| 1996 | 1996-02-21 | 1996-10-31 |
| 1997 | 1997-03-04 | 1997-10-04 |
| 1998 | 1998-02-23 | 1998-10-04 |
| 1999 | 1999-03-11 | 1999-08-30 |
| 2000 | 2000-02-14 | 2000-11-01 |
| 2001 | 2001-03-13 | 2001-10-24 |
| 2002 | 2002-03-14 | 2002-10-16 |
| 2003 | 2003-02-12 | 2003-10-26 |
| 2004 | 2004-03-08 | 2004-11-11 |
| 2005 | 2005-03-28 | 2005-10-21 |
| 2006 | 2006-02-16 | 2006-10-11 |
| 2007 | 2007-02-22 | 2007-10-18 |
| 2008 | 2008-02-22 | 2008-08-11 |
| 2009 | 2009-02-20 | 2009-11-07 |
| 2010 | 2010-04-04 | 2010-11-01 |
| 2011 | 2011-02-18 | 2011-10-07 |
| 2012 | 2012-03-03 | 2012-10-27 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 42 | 207 | 2009 | 111 |
| 35 C (95 F): Days | 23 | 24 | 1998 | 5 |
| 90 F (32.2 C): Days | 39 | 70 | 2009 | 30 |
| 100 F (37.8 C): Days | 4 | 3 | 2011 | 3 |
| 0 C (32 F): Frost days (min | 42 | 51 | 2010 | 8 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 45 | 28 | 2004 | 14 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 44 | 10 | 1992 | 5 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 19 | 3 | 2008 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1971.
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). Threshold counts are computed by this site.
Data as of . Last revised (2025-12-31).