The year at a glance
Averages from 30 years of climate history, 1991-2020
| Alum Rock | Metric | San Jose |
|---|---|---|
| 263 days | Sunny daysclear or partly cloudy skies | 263 days |
| 22 in | Precipitationper year | 17 in |
| 56 days | Wet daysrain or snow per year | 60 days |
| 0 in | Snowfallper year | 0 in |
| 20 days | Hot daysabove 90 °F | 21 days |
| 3 days | Freezing nightsat or below 32 °F | 5 days |
| 67% | Humidityaverage relative | 67% |
| 61 °F | Average temperatureyear round | 61 °F |
Monthly temperatures
Average daily high and low for each month, in °F. The gap between the two lines is what an ordinary day feels like across the year.
Daily highs
Daily lows
View monthly temperatures as a table
| City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Alum Rock high | 59 | 63 | 66 | 70 | 74 | 80 | 82 | 82 | 81 | 75 | 65 | 59 |
| San Jose high | 59 | 62 | 66 | 70 | 75 | 80 | 82 | 83 | 82 | 75 | 65 | 59 |
| Alum Rock low | 42 | 44 | 47 | 49 | 52 | 56 | 58 | 59 | 57 | 53 | 46 | 42 |
| San Jose low | 42 | 44 | 46 | 48 | 52 | 55 | 58 | 58 | 57 | 52 | 46 | 42 |
Monthly precipitation
Total rain plus melted snow for each month, in inches. Taller bars mean wetter months.
View monthly precipitation as a table
| City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Alum Rock | 4.5 | 4.5 | 3.3 | 1.6 | 0.8 | 0.2 | 0.1 | 0.0 | 0.1 | 1.0 | 1.9 | 3.9 |
| San Jose | 3.4 | 3.4 | 2.6 | 1.2 | 0.6 | 0.1 | 0.0 | 0.0 | 0.1 | 0.8 | 1.5 | 3.0 |
Monthly sunny days
Days each month with clear or partly cloudy skies, so compare the same month between cities.
View monthly sunny days as a table
| City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Alum Rock | 15 | 14 | 16 | 19 | 24 | 27 | 30 | 30 | 29 | 26 | 19 | 16 |
| San Jose | 15 | 14 | 16 | 19 | 24 | 27 | 30 | 30 | 29 | 26 | 19 | 16 |
Keep comparing
Nearby cities and popular picks for each side of this matchup. Any two cities can be compared from the home page.
Alum Rock vs another city
- Alum Rock vs East Foothills, CA
- Alum Rock vs Milpitas, CA
- Alum Rock vs Burbank, CA
- Alum Rock vs Santa Clara, CA
- Alum Rock vs Campbell, CA
- Alum Rock vs New York, NY
- Alum Rock vs Los Angeles, CA
- Alum Rock vs Chicago, IL
- Alum Rock vs Houston, TX
- Alum Rock vs Phoenix, AZ
- Alum Rock vs Philadelphia, PA
San Jose vs another city
- San Jose vs East Foothills, CA
- San Jose vs Burbank, CA
- San Jose vs Campbell, CA
- San Jose vs Los Gatos, CA
- San Jose vs Santa Clara, CA
- San Jose vs New York, NY
- San Jose vs Los Angeles, CA
- San Jose vs Chicago, IL
- San Jose vs Houston, TX
- San Jose vs Phoenix, AZ
- San Jose vs Philadelphia, PA
About this data
Every figure on this page is a 30 year average computed from daily climate history for 1991-2020, using each city's own coordinates. Wet days count days with measurable precipitation, calibrated against the wet day counts in NOAA's published climate normals. Sunny days count clear plus partly cloudy days, defined as average cloud cover of 63 percent or less and calibrated against NOAA's published sky cover tables. Snowfall figures are model estimates anchored to NOAA station measurements near each city.
Weather data by Open-Meteo.com (CC BY 4.0). Contains modified Copernicus Climate Change Service information (ERA5, ERA5-Land).