Annual mean
Annual mean of daily highs
Annual mean of daily lows
Altadena CDP, California
Official LSAD Designation: Altadena CDP • Census GEOID: 0601290
• Los Angeles County
Climate Normals & Weather Observations
30-year climate normals (1991–2020) and weather observations for Altadena CDP.
Reference Weather Station: PASADENA, CA US (ID: USC00046719)
• Located 3.1 miles from community center
• Elevation: 263.3 m
| Month | Average High (°F) | Average Low (°F) | Mean Temp (°F) | Precipitation (in) |
|---|---|---|---|---|
| January | 68.1° | 45.5° | 56.8° | 4.51" |
| February | 69.3° | 46.1° | 57.7° | 5.16" |
| March | 72.6° | 48.4° | 60.5° | 3.03" |
| April | 76.2° | 50.6° | 63.4° | 1.11" |
| May | 78.3° | 53.9° | 66.1° | 0.48" |
| June | 83.7° | 57.8° | 70.7° | 0.21" |
| July | 89.1° | 62.0° | 75.6° | 0.06" |
| August | 91.3° | 63.2° | 77.2° | 0.03" |
| September | 89.9° | 61.6° | 75.8° | 0.22" |
| October | 83.0° | 56.3° | 69.7° | 0.84" |
| November | 74.7° | 49.6° | 62.1° | 1.10" |
| December | 67.2° | 44.7° | 56.0° | 3.33" |
Annual Temperature History
2010–2025, completed calendar years only.
NOAA station PASADENA, CA US (ID: USC00046719) • 3.1 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 | 66.3 | 77.5 | 55.0 |
| 2011 | 66.1 | 77.5 | 54.7 |
| 2012 | 68.2 | 79.8 | 56.6 |
| 2013 | 67.9 | 79.8 | 56.2 |
| 2014 | 70.4 | 82.3 | 58.6 |
| 2015 | Unavailable | 81.1 | Unavailable |
| 2016 | 67.3 | 80.0 | 54.5 |
| 2017 | Unavailable | 80.2 | Unavailable |
| 2018 | 67.0 | 79.4 | 54.7 |
| 2019 | 65.1 | 76.9 | 53.2 |
| 2020 | 68.4 | 81.1 | 55.7 |
| 2021 | 68.3 | 80.7 | 56.0 |
| 2022 | 69.6 | 82.1 | 57.1 |
| 2023 | 66.5 | 77.6 | 55.4 |
| 2024 | 67.4 | 78.9 | 55.9 |
| 2025 | 67.6 | 78.9 | 56.4 |
Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.