The year at a glance
Averages from 30 years of climate history, 1991-2020
| Blackhawk | Metric | San Ramon |
|---|---|---|
| 257 days | Sunny daysclear or partly cloudy skies | 257 days |
| 18 in | Precipitationper year | 18 in |
| 53 days | Wet daysrain or snow per year | 53 days |
| 0 in | Snowfallper year | 0 in |
| 38 days | Hot daysabove 90 °F | 45 days |
| 18 days | Freezing nightsat or below 32 °F | 17 days |
| 69% | Humidityaverage relative | 69% |
| 59 °F | Average temperatureyear round | 60 °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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Blackhawk high | 55 | 57 | 61 | 65 | 71 | 79 | 85 | 85 | 83 | 74 | 63 | 55 |
| San Ramon high | 56 | 59 | 63 | 67 | 73 | 81 | 86 | 86 | 84 | 76 | 64 | 56 |
| Blackhawk low | 40 | 41 | 43 | 45 | 49 | 55 | 59 | 59 | 58 | 52 | 44 | 40 |
| San Ramon low | 39 | 41 | 42 | 45 | 49 | 54 | 58 | 58 | 56 | 51 | 44 | 39 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Blackhawk | 3.5 | 3.7 | 2.8 | 1.3 | 0.7 | 0.1 | 0.0 | 0.1 | 0.1 | 0.8 | 1.6 | 3.2 |
| San Ramon | 3.5 | 3.7 | 2.8 | 1.3 | 0.7 | 0.1 | 0.0 | 0.1 | 0.1 | 0.8 | 1.6 | 3.2 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Blackhawk | 14 | 13 | 16 | 20 | 23 | 26 | 29 | 29 | 28 | 25 | 18 | 16 |
| San Ramon | 14 | 13 | 16 | 20 | 23 | 26 | 29 | 29 | 28 | 25 | 18 | 16 |
Keep comparing
Nearby cities and popular picks for each side of this matchup. Any two cities can be compared from the home page.
Blackhawk vs another city
- Blackhawk vs Camino Tassajara, CA
- Blackhawk vs Danville, CA
- Blackhawk vs Alamo, CA
- Blackhawk vs Dublin, CA
- Blackhawk vs Clayton, CA
- Blackhawk vs New York, NY
- Blackhawk vs Los Angeles, CA
- Blackhawk vs Chicago, IL
- Blackhawk vs Houston, TX
- Blackhawk vs Phoenix, AZ
- Blackhawk vs Philadelphia, PA
San Ramon vs another city
- San Ramon vs Camino Tassajara, CA
- San Ramon vs Danville, CA
- San Ramon vs Dublin, CA
- San Ramon vs Pleasanton, CA
- San Ramon vs Alamo, CA
- San Ramon vs New York, NY
- San Ramon vs Los Angeles, CA
- San Ramon vs Chicago, IL
- San Ramon vs Houston, TX
- San Ramon vs Phoenix, AZ
- San Ramon 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).