Annual mean
Annual mean of daily highs
Annual mean of daily lows
Alto CDP, California
Official LSAD Designation: Alto CDP • Census GEOID: 0601416
• Marin County
Climate Normals & Weather Observations
30-year climate normals (1991–2020) and weather observations for Alto CDP.
Reference Weather Station: KENTFIELD, CA US (ID: USC00044500)
• Located 3.8 miles from community center
• Elevation: 44.2 m
| Month | Average High (°F) | Average Low (°F) | Mean Temp (°F) | Precipitation (in) |
|---|---|---|---|---|
| January | 56.6° | 41.9° | 49.2° | 8.77" |
| February | 61.1° | 43.2° | 52.2° | 8.72" |
| March | 65.1° | 44.4° | 54.8° | 6.00" |
| April | 68.7° | 46.3° | 57.5° | 2.61" |
| May | 73.5° | 49.5° | 61.5° | 1.40" |
| June | 79.6° | 52.0° | 65.8° | 0.36" |
| July | 82.5° | 53.2° | 67.9° | 0.00" |
| August | 83.0° | 53.6° | 68.3° | 0.05" |
| September | 82.1° | 52.7° | 67.4° | 0.09" |
| October | 75.8° | 50.0° | 62.9° | 1.98" |
| November | 63.6° | 45.4° | 54.5° | 4.63" |
| December | 56.4° | 41.7° | 49.1° | 9.78" |
Annual Temperature History
2010–2025, completed calendar years only.
NOAA station KENTFIELD, CA US (ID: USC00044500) • 3.8 miles from community center .
This is the same reference station used for monthly normals.
Source: NOAA NCEI Global Summary of the Year.
Annual temperature data table (°F)
| Year | Annual mean (°F) | Annual mean of daily highs (°F) | Annual mean of daily lows (°F) |
|---|---|---|---|
| 2010 | Unavailable | Unavailable | 47.8 |
| 2011 | Unavailable | Unavailable | 46.6 |
| 2012 | Unavailable | Unavailable | 47.0 |
| 2013 | 59.4 | 71.7 | 47.1 |
| 2014 | 61.4 | 73.2 | 49.7 |
| 2015 | 61.3 | 73.2 | 49.3 |
| 2016 | 60.2 | 71.3 | 49.0 |
| 2017 | 60.3 | 71.7 | 49.0 |
| 2018 | 59.5 | 71.1 | 47.9 |
| 2019 | 59.7 | 70.8 | 48.7 |
| 2020 | 61.1 | 73.2 | 48.9 |
| 2021 | 59.5 | 71.2 | 47.8 |
| 2022 | 59.8 | 72.1 | 47.6 |
| 2023 | 58.8 | 69.9 | 47.7 |
| 2024 | 60.6 | 72.2 | 49.0 |
| 2025 | 59.3 | 70.2 | 48.4 |
Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.