The year at a glance
Averages from 30 years of climate history, 1991-2020
| Fontana | Metric | San Diego |
|---|---|---|
| 284 days | Sunny daysclear or partly cloudy skies | 283 days |
| 11 in | Precipitationper year | 12 in |
| 36 days | Wet daysrain or snow per year | 38 days |
| 0 in | Snowfallper year | 0 in |
| 97 days | Hot daysabove 90 °F | 15 days |
| 2 days | Freezing nightsat or below 32 °F | 0 days |
| 59% | Humidityaverage relative | 74% |
| 67 °F | Average temperatureyear round | 64 °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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Fontana high | 68 | 69 | 72 | 76 | 80 | 87 | 94 | 95 | 92 | 82 | 75 | 67 |
| San Diego high | 67 | 67 | 69 | 71 | 72 | 75 | 80 | 82 | 81 | 78 | 73 | 67 |
| Fontana low | 44 | 46 | 48 | 51 | 55 | 60 | 64 | 65 | 63 | 56 | 48 | 43 |
| San Diego low | 46 | 47 | 50 | 53 | 57 | 60 | 64 | 65 | 64 | 58 | 50 | 45 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Fontana | 2.2 | 2.6 | 1.6 | 0.7 | 0.4 | 0.1 | 0.1 | 0.0 | 0.1 | 0.5 | 0.7 | 1.6 |
| San Diego | 2.3 | 2.9 | 1.9 | 0.9 | 0.4 | 0.1 | 0.1 | 0.1 | 0.2 | 0.6 | 0.9 | 1.9 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Fontana | 19 | 16 | 18 | 21 | 24 | 27 | 29 | 30 | 28 | 26 | 24 | 21 |
| San Diego | 20 | 17 | 20 | 22 | 22 | 26 | 28 | 30 | 28 | 26 | 24 | 21 |
Keep comparing
Nearby cities and popular picks for each side of this matchup. Any two cities can be compared from the home page.
Fontana vs another city
- Fontana vs Rialto, CA
- Fontana vs Bloomington, CA
- Fontana vs Rancho Cucamonga, CA
- Fontana vs Muscoy, CA
- Fontana vs Jurupa Valley, CA
- Fontana vs Colton, CA
- Fontana vs New York, NY
- Fontana vs Los Angeles, CA
- Fontana vs Chicago, IL
- Fontana vs Houston, TX
- Fontana vs Phoenix, AZ
- Fontana vs Philadelphia, PA
San Diego vs another city
- San Diego vs La Mesa, CA
- San Diego vs Lemon Grove, CA
- San Diego vs Santee, CA
- San Diego vs El Cajon, CA
- San Diego vs Casa de Oro-Mount Helix, CA
- San Diego vs La Presa, CA
- San Diego vs New York, NY
- San Diego vs Los Angeles, CA
- San Diego vs Chicago, IL
- San Diego vs Houston, TX
- San Diego vs Phoenix, AZ
- San Diego 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).