Palos Altos Threshold Days by Year (MXN00012063)
13 fixed thresholds counted per year at Palos Altos (MXN00012063): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Palos Altos Thresholds
- Palos Altos: days with 10 mm (0.39 in) or more of precipitation in 46 years, most in 1967 with 53.
- Palos Altos: days with 25 mm (0.98 in) or more of precipitation in 46 years, most in 1985 with 20.
- Palos Altos: days with a maximum temperature at or above 30 C (86 F) in 43 years, most in 2000 with 366.
- Palos Altos: days with a maximum temperature at or above 35 C (95 F) in 43 years, most in 1970 with 250.
- 13 fixed thresholds have at least one qualifying day at Palos Altos.
Days at or above 30 C (86 F)
43 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1963 | 331 | 354.7 |
| 1964 | 359 | 354.7 |
| 1965 | 357 | 354.7 |
| 1966 | 361 | 354.7 |
| 1967 | 358 | 354.7 |
| 1968 | 357 | 354.7 |
| 1969 | 360 | 354.7 |
| 1970 | 363 | 357.1 |
| 1971 | 364 | 357.1 |
| 1972 | 364 | 357.1 |
| 1973 | 354 | 357.1 |
| 1974 | 356 | 357.1 |
| 1975 | 351 | 357.1 |
| 1976 | 346 | 357.1 |
| 1977 | 358 | 357.1 |
| 1978 | 357 | 357.1 |
| 1979 | 358 | 357.1 |
| 1980 | 345 | 352.3 |
| 1981 | 352 | 352.3 |
| 1982 | 361 | 352.3 |
| 1983 | 358 | 352.3 |
| 1984 | 348 | 352.3 |
| 1985 | 360 | 352.3 |
| 1986 | 357 | 352.3 |
| 1987 | 361 | 352.3 |
| 1988 | 329 | 352.3 |
| 1990 | 329 | 341.3 |
| 1992 | 344 | 341.3 |
| 1993 | 345 | 341.3 |
| 1994 | 334 | 341.3 |
| 1995 | 329 | 341.3 |
| 1998 | 344 | 341.3 |
| 1999 | 364 | 341.3 |
| 2000 | 366 | 295.4 |
| 2001 | 328 | 295.4 |
| 2002 | 328 | 295.4 |
| 2003 | 249 | 295.4 |
| 2004 | 267 | 295.4 |
| 2006 | 247 | 295.4 |
| 2008 | 247 | 295.4 |
| 2009 | 331 | 295.4 |
| 2010 | 298 | 298 |
| 2011 | 298 | 298 |
| Year | First date | Last date |
|---|---|---|
| 1963 | 1963-01-01 | 1963-12-31 |
| 1964 | 1964-01-01 | 1964-12-31 |
| 1965 | 1965-01-01 | 1965-12-31 |
| 1966 | 1966-01-01 | 1966-12-31 |
| 1967 | 1967-01-01 | 1967-12-31 |
| 1968 | 1968-01-01 | 1968-12-31 |
| 1969 | 1969-01-01 | 1969-12-31 |
| 1970 | 1970-01-01 | 1970-12-31 |
| 1971 | 1971-01-01 | 1971-12-31 |
| 1972 | 1972-01-01 | 1972-12-31 |
| 1973 | 1973-01-01 | 1973-12-31 |
| 1974 | 1974-01-01 | 1974-12-31 |
| 1975 | 1975-01-01 | 1975-12-31 |
| 1976 | 1976-01-01 | 1976-12-31 |
| 1977 | 1977-01-01 | 1977-12-31 |
| 1978 | 1978-01-01 | 1978-12-31 |
| 1979 | 1979-01-01 | 1979-12-31 |
| 1980 | 1980-01-01 | 1980-12-31 |
| 1981 | 1981-01-01 | 1981-12-31 |
| 1982 | 1982-01-01 | 1982-12-31 |
| 1983 | 1983-01-01 | 1983-12-31 |
| 1984 | 1984-01-01 | 1984-12-31 |
| 1985 | 1985-01-01 | 1985-12-31 |
| 1986 | 1986-01-01 | 1986-12-31 |
| 1987 | 1987-01-01 | 1987-12-31 |
| 1988 | 1988-02-01 | 1988-12-31 |
| 1990 | 1990-02-01 | 1990-12-31 |
| 1992 | 1992-01-01 | 1992-12-31 |
| 1993 | 1993-01-01 | 1993-12-16 |
| 1994 | 1994-01-17 | 1994-12-18 |
| 1995 | 1995-01-16 | 1995-12-14 |
| 1998 | 1998-01-21 | 1998-12-31 |
| 1999 | 1999-01-02 | 1999-12-31 |
| 2000 | 2000-01-01 | 2000-12-31 |
| 2001 | 2001-01-01 | 2001-12-31 |
| 2002 | 2002-01-01 | 2002-12-31 |
| 2003 | 2003-01-01 | 2003-12-31 |
| 2004 | 2004-01-01 | 2004-12-31 |
| 2006 | 2006-01-01 | 2006-12-31 |
| 2008 | 2008-01-01 | 2008-12-31 |
| 2009 | 2009-01-01 | 2009-12-31 |
| 2010 | 2010-01-01 | 2010-12-31 |
| 2011 | 2011-01-01 | 2011-12-31 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 43 | 366 | 2000 | 298 |
| 35 C (95 F): Days | 43 | 250 | 1970 | 78 |
| 40 C (104 F): Days | 38 | 93 | 1969 | 8 |
| 45 C (113 F): Days | 2 | 1 | 1982 | 1 |
| 90 F (32.2 C): Days | 43 | 340 | 2000 | 162 |
| 100 F (37.8 C): Days | 43 | 131 | 1970 | 17 |
| 110 F (43.3 C): Days | 11 | 8 | 1969 | 2 |
| 20 C (68 F): Tropical nights (min | 43 | 275 | 1978 | 64 |
| 25 C (77 F): Days with min | 35 | 50 | 1980 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 46 | 53 | 1967 | 27 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 46 | 20 | 1985 | 13 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 42 | 7 | 1973 | 2 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 1 | 1 | 1994 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1963.
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).