CA
Diamond Bar and Walnut have remarkably similar climates.
The year at a glance
Averages from 30 years of climate history, 1991-2020
| Diamond Bar | Metric | Walnut |
|---|---|---|
| 290 days | Sunny daysclear or partly cloudy skies | 290 days |
| 16 in | Precipitationper year | 16 in |
| 38 days | Wet daysrain or snow per year | 38 days |
| 0 in | Snowfallper year | 0 in |
| 70 days | Hot daysabove 90 °F | 70 days |
| 3 days | Freezing nightsat or below 32 °F | 3 days |
| 63% | Humidityaverage relative | 63% |
| 66 °F | Average temperatureyear round | 66 °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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Diamond Bar high | 69 | 69 | 73 | 76 | 79 | 84 | 90 | 92 | 89 | 82 | 75 | 68 |
| Walnut high | 69 | 68 | 72 | 76 | 79 | 84 | 90 | 92 | 89 | 82 | 74 | 68 |
| Diamond Bar low | 44 | 45 | 48 | 51 | 55 | 58 | 63 | 64 | 61 | 55 | 48 | 43 |
| Walnut low | 44 | 45 | 48 | 50 | 55 | 58 | 63 | 63 | 61 | 55 | 48 | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Diamond Bar | 3.6 | 4.0 | 2.4 | 1.0 | 0.4 | 0.1 | 0.1 | 0.0 | 0.2 | 0.7 | 1.0 | 2.4 |
| Walnut | 3.6 | 4.0 | 2.4 | 1.0 | 0.4 | 0.1 | 0.1 | 0.0 | 0.2 | 0.7 | 1.0 | 2.4 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Diamond Bar | 19 | 17 | 20 | 23 | 25 | 28 | 29 | 30 | 29 | 27 | 24 | 21 |
| Walnut | 19 | 17 | 20 | 23 | 25 | 28 | 29 | 30 | 29 | 27 | 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.
Diamond Bar vs another city
- Diamond Bar vs Rowland Heights, CA
- Diamond Bar vs South San Jose Hills, CA
- Diamond Bar vs Pomona, CA
- Diamond Bar vs Brea, CA
- Diamond Bar vs West Covina, CA
- Diamond Bar vs New York, NY
- Diamond Bar vs Los Angeles, CA
- Diamond Bar vs Chicago, IL
- Diamond Bar vs Houston, TX
- Diamond Bar vs Phoenix, AZ
- Diamond Bar vs Philadelphia, PA
Walnut vs another city
- Walnut vs South San Jose Hills, CA
- Walnut vs West Covina, CA
- Walnut vs Covina, CA
- Walnut vs Valinda, CA
- Walnut vs Charter Oak, CA
- Walnut vs New York, NY
- Walnut vs Los Angeles, CA
- Walnut vs Chicago, IL
- Walnut vs Houston, TX
- Walnut vs Phoenix, AZ
- Walnut 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).