Portola, CA
Climate overview — based on NOAA 1991-2020 normals from PORTOLA, CA US.
Year-round temperatures (°F)
Climate summary
Portola has an annual average temperature of 46.7°F with about 23.3 inches of precipitation per year and 37.8 inches of snow. The warmest month is July (average high 86.4°F), and the coldest is January (average low 19.3°F). December is typically the wettest month (4.28 in) and August the driest (0.30 in). Snow typically falls from October through May.
Best time to visit Portola
Full guide →Climate change signal
All-time records →39 of 366 (10.7%) of Portola's all-time daily heat records have been set since 2015. If records were spread evenly across the station's history, only about 5% would fall in any given decade.
| 1910s | 29 | |
| 1920s | 105 | |
| 1930s | 43 | |
| 1940s | 22 | |
| 1950s | 28 | |
| 1960s | 18 | |
| 1970s | 16 | |
| 1980s | 25 | |
| 1990s | 12 | |
| 2000s | 19 | |
| 2010s | 27 | |
| 2020s | 22 |
Bars: number of all-time daily heat records still standing that were set in each decade.
Monthly averages
| Month | Avg High | Avg Low | Avg Temp | Precipitation | Snow | Rainy days |
|---|---|---|---|---|---|---|
| January | 43.0°F | 19.3°F | 31.1°F | 4.16 in | 11.7 in | 9 |
| February | 46.0°F | 21.4°F | 33.7°F | 3.93 in | 7.6 in | 9 |
| March | 51.6°F | 25.3°F | 38.4°F | 3.57 in | 6.4 in | 8 |
| April | 57.7°F | 29.1°F | 43.4°F | 1.55 in | 1.8 in | 6 |
| May | 67.0°F | 35.1°F | 51.0°F | 1.15 in | 0.2 in | 6 |
| June | 77.2°F | 40.1°F | 58.7°F | 0.52 in | — | 3 |
| July | 86.4°F | 44.6°F | 65.5°F | 0.34 in | — | 1 |
| August | 85.2°F | 42.6°F | 63.9°F | 0.30 in | — | 1 |
| September | 78.8°F | 37.1°F | 58.0°F | 0.44 in | 0.1 in | 2 |
| October | 66.4°F | 29.7°F | 48.1°F | 1.07 in | 0.4 in | 4 |
| November | 52.5°F | 24.1°F | 38.3°F | 2.03 in | 2.4 in | 6 |
| December | 42.1°F | 19.4°F | 30.7°F | 4.28 in | 7.2 in | 8 |
Climate twins of Portola
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).