Annual mean
Annual mean of daily highs
Annual mean of daily lows
Alta Sierra CDP, California
Official LSAD Designation: Alta Sierra CDP • Census GEOID: 0601360
• Nevada County
Climate Normals & Weather Observations
30-year climate normals (1991–2020) and weather observations for Alta Sierra CDP.
Reference Weather Station: GRASS VALLEY #2, CA US (ID: USC00043573)
• Located 5.5 miles from community center
• Elevation: 731.5 m
| Month | Average High (°F) | Average Low (°F) | Mean Temp (°F) | Precipitation (in) |
|---|---|---|---|---|
| January | 53.6° | 33.1° | 43.4° | 9.30" |
| February | 54.9° | 34.2° | 44.5° | 8.98" |
| March | 57.9° | 37.0° | 47.5° | 8.16" |
| April | 62.7° | 40.0° | 51.3° | 4.43" |
| May | 70.8° | 46.8° | 58.8° | 2.48" |
| June | 80.2° | 52.6° | 66.4° | 0.74" |
| July | 88.0° | 58.2° | 73.1° | 0.00" |
| August | 87.4° | 56.8° | 72.1° | 0.11" |
| September | 82.3° | 52.1° | 67.2° | 0.44" |
| October | 72.1° | 44.2° | 58.2° | 2.56" |
| November | 59.8° | 37.1° | 48.4° | 5.52" |
| December | 52.6° | 32.6° | 42.6° | 10.48" |
Annual Temperature History
2010–2025, completed calendar years only.
NOAA station GRASS VALLEY #2, CA US (ID: USC00043573) • 5.5 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 | 54.8 | 66.1 | 43.6 |
| 2011 | 54.4 | 66.4 | 42.4 |
| 2012 | 56.5 | 68.8 | 44.1 |
| 2013 | 56.8 | 70.3 | 43.3 |
| 2014 | 58.6 | 71.0 | 46.1 |
| 2015 | 58.4 | 71.2 | 45.5 |
| 2016 | 57.1 | 69.5 | 44.8 |
| 2017 | 57.5 | 69.6 | 45.4 |
| 2018 | 57.3 | 70.2 | 44.3 |
| 2019 | 55.9 | 67.9 | 43.8 |
| 2020 | 58.1 | 71.3 | 44.9 |
| 2021 | 58.1 | 71.2 | 45.0 |
| 2022 | 57.3 | 71.0 | 43.7 |
| 2023 | 55.7 | 68.2 | 43.3 |
| 2024 | 58.0 | 70.6 | 45.3 |
| 2025 | 57.6 | 70.3 | 44.8 |
Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.