| Month | Average (°F) | Record (°F) | Average (inches) | ||
|---|---|---|---|---|---|
| High ☀️ | Low 🌙 | High ☀️ | Low 🌙 | Precipitation 💧 | |
| January | 57.3 | 38.1 | 85 | 18 | 4.4 |
| February | 61.2 | 39.4 | 81 | 21 | 4.0 |
| March | 64.7 | 41.2 | 92 | 23 | 3.2 |
| April | 68.6 | 43.1 | 95 | 25 | 1.3 |
| May | 73.3 | 47.4 | 104 | 30 | 0.9 |
| June | 78.9 | 51.4 | 113 | 34 | 0.2 |
| July | 79.6 | 54.0 | 112 | 38 | 0.0 |
| August | 80.5 | 53.8 | 106 | 37 | 0.0 |
| September | 80.9 | 50.8 | 114 | 35 | 0.1 |
| October | 75.8 | 46.1 | 106 | 28 | 1.1 |
| November | 65.1 | 40.6 | 89 | 22 | 2.2 |
| December | 57.5 | 37.4 | 81 | 14 | 4.3 |
| Entire year | 70.4 | 45.3 | 114 | 14 | 21.9 |
|
More Napa Weather Records
1901–2024
|
||
|---|---|---|
| Highest daily low | 76 °F | June 24, 1976 |
| Lowest daily high | 30 °F | February 4, 1903 |
| Greatest daily range (Difference of high and low) |
63 °F | June 14, 1961 |
| Greatest difference in daily high over two conscutive days |
35 °F | Sep 8–9, 2020 |
| Most daily precipitation | 5.9 inches | November 21, 1977 |
| Most monthly precipitation | 16.1 inches | December 1955 |
| Most yearly precipitation | 51.2 inches | 1983 |
| Most yearly days with precipitation | 115 | 1998 |
| Earliest freeze | October 12 | 1932 |
| Earliest day ≥ 80 °F | January 1 | 1996 |
| Earliest day ≥ 90 °F | March 17 | 1914 |
| Earliest day ≥ 100 °F | May 12 | 1976 |
| Latest freeze | May 23 | 2010 |
| Latest day ≥ 80 °F | December 26 | 1967 |
| Latest day ≥ 90 °F | October 31 | 1906 |
| Latest day ≥ 100 °F | October 15 | 2020 |
| Most days in a year < 32 °F | 60 | 1949 |
| Most days in a year ≥ 80 °F | 130 | 1932 |
| Most days in a year ≥ 90 °F | 45 | 1932 |
| Most days in a year ≥ 100 °F | 11 | 1917 |
| Most days in a year ≥ 110 °F | 2 | 2022 |
|
Napa Weather Streaks
Most consecutive days...
|
||
|---|---|---|
| With precipitation | 24 days | Jan 31 – Feb 23, 1998 |
| Without precipitation | 175 days | May 1 – Oct 22, 1987 |
| High temperature ≥ 80 °F | 61 days | Jun 28 – Aug 27, 1932 |
| High temperature ≥ 90 °F | 11 days | Sep 22 – Oct 2, 1970 |
| High temperature ≥ 100 °F | 7 days | Jul 2–8, 1905 |