Climate Comfort Score
42/100
Moderate
2026 data Public-data reference. official source
Diablo Dam, WA Climate
Temperature, precipitation, and comfort score from NOAA NCEI 1991-2020 normals →
30-year climate normals from 1 weather station (1991-2020).
Diablo Dam, Washington has an average annual temperature of 49°F and a climate comfort score of 42/100 (Moderate). Annual precipitation totals 77.4", including 45.7" of snow. Based on NOAA 30-year normals (1991–2020).
Avg Temperature
49°F (10°C)
Avg High
58°F
Avg Low
41°F
Annual Precip
77.4"
Annual Snow
45.7"
Comfort Score
42/100
Moderate
Avg Annual Temperature
49°F
30-year mean (NOAA NCEI)
Annual Precipitation
77.4"
Plus 45.7" of snow
Comfort score vs national 100-point ceiling (Diablo Dam) 42.0%
National median (≈55)
PlainClimate composite — temperature mildness, humidity, precipitation, extreme-weather frequency. Moderate for the Diablo Dam area.
Warming context for Diablo Dam
MethodologyHow the U.S. land temperature anomaly tracks against the global mean since 1900. The current NOAA 1991-2020 normal for Diablo Dam captures average conditions across the spread shown — the most recent decade is warmer than the 30-year mean.
- United States land mean (NOAA NCEI) +0.11 °C/decade
- Global anomaly (NASA GISTEMP) +0.11 °C/decade
- Paris Agreement thresholds 1.5°C / 2.0°C
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 39°F (4°C) | 30°F (-1°C) | 34°F (1°C) | 12.3" | 12.2" | 20.0 | 0.0 |
| February | 43°F (6°C) | 30°F (-1°C) | 37°F (3°C) | 7.4" | 9.9" | 18.0 | 0.0 |
| March | 49°F (9°C) | 33°F (1°C) | 41°F (5°C) | 8.2" | 4.2" | 12.8 | 0.0 |
| April | 57°F (14°C) | 38°F (3°C) | 47°F (9°C) | 4.6" | 0.3" | 3.5 | 0.0 |
| May | 66°F (19°C) | 44°F (7°C) | 55°F (13°C) | 2.7" | 0.0" | 0.2 | 0.5 |
| June | 70°F (21°C) | 49°F (10°C) | 60°F (15°C) | 2.3" | 0.0" | 0.0 | 1.6 |
| July | 78°F (26°C) | 53°F (12°C) | 66°F (19°C) | 1.3" | 0.0" | 0.0 | 4.1 |
| August | 79°F (26°C) | 54°F (12°C) | 66°F (19°C) | 1.5" | 0.0" | 0.0 | 4.5 |
| September | 71°F (22°C) | 49°F (9°C) | 60°F (16°C) | 3.4" | 0.0" | 0.0 | 1.1 |
| October | 58°F (14°C) | 42°F (5°C) | 50°F (10°C) | 8.6" | 0.0" | 1.3 | 0.0 |
| November | 45°F (7°C) | 35°F (2°C) | 40°F (4°C) | 13.7" | 3.1" | 9.9 | 0.0 |
| December | 38°F (3°C) | 30°F (-1°C) | 34°F (1°C) | 11.6" | 16.0" | 20.3 | 0.0 |
Monthly Precipitation
Average monthly rainfall and snowfall
January 12.3"
Snow: 12.2"
18.8 days with precipitation
February 7.4"
Snow: 9.9"
15.6 days with precipitation
March 8.2"
Snow: 4.2"
19.0 days with precipitation
April 4.6"
Snow: 0.3"
16.5 days with precipitation
May 2.7"
12.8 days with precipitation
June 2.3"
12.1 days with precipitation
July 1.3"
6.4 days with precipitation
August 1.5"
6.3 days with precipitation
September 3.4"
10.8 days with precipitation
October 8.6"
16.6 days with precipitation
November 13.7"
Snow: 3.1"
19.9 days with precipitation
December 11.6"
Snow: 16.0"
19.5 days with precipitation
Frost Dates & Growing Season
First Fall Freeze
November 1
50% probability date
Last Spring Freeze
April 10
50% probability date
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
6,005
Higher = more heating needed
Cooling Degree Days
245
Higher = more cooling needed
Warmest Month
August
Coldest Month
January
Related Data
PlainEnviro
EPA environmental data — pollution, water quality, and environmental health by location
PlainCarbon
Carbon emissions data — greenhouse gas reporting and facility-level CO2 data
PlainHazard
Natural disaster data — weather-related hazards, FEMA declarations, and risk profiles
PlainAirData
EPA air quality data — AQI readings, pollutant levels, and air quality trends
Climate Guides
Climate Insight: Diablo Dam, WA
The NOAA 1991–2020 climate normals describe Diablo Dam, Washington as a location with an annual average temperature of 49°F, ranging from a mean daily high of 58°F to a mean daily low of 41°F. August is typically the warmest month of the year, while January is the coldest. These thirty-year averages, computed from station USC00452157, smooth out year-to-year variability and give a baseline expectation for typical conditions in any given month.
Precipitation patterns matter as much as temperature for anyone planning to live, garden, or travel here. Diablo Dam receives roughly 77.4 inches of precipitation each year, with 45.7 inches typically falling as snow. Growing-season length varies with elevation and microclimate, with the last spring freeze near April 10 and the first fall freeze near November 1. For energy use, 6,005 heating degree days and 245 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Diablo Dam scores 42/100 (Moderate), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. Use the monthly tables above to plan around specific windows — shoulder seasons for mild highs and lows, peak summer for August-driven heat, or deep winter for January-driven cold. All figures here are thirty-year averages: any single year may run warmer, wetter, drier, or cooler than the normal, so treat them as planning guidance rather than forecasts.
Frequently Asked Questions
What is the average temperature in Diablo Dam, WA? ▼
The average annual temperature in Diablo Dam, Washington is 49°F. The warmest month averages 79°F (26°C) and the coldest averages 30°F (-1°C).
How much rain does Diablo Dam get? ▼
Diablo Dam receives 77.4 inches of precipitation annually, including 45.7 inches of snow. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Diablo Dam? ▼
Diablo Dam has a climate comfort score of 42/100 (Moderate). This score considers temperature mildness, humidity, precipitation, and extreme weather frequency.
When is the growing season in Diablo Dam? ▼
Growing season data is not available for Diablo Dam.
How much energy does heating and cooling require in Diablo Dam? ▼
Diablo Dam has 6,005 heating degree days and 245 cooling degree days annually. Higher heating degree days indicate greater winter energy demand, while higher cooling degree days indicate greater summer cooling needs.
Where does this Diablo Dam climate data come from? ▼
All climate data comes from NOAA U.S. Climate Normals v1.0.1, covering the 30-year period from 1991 to 2020. Data is collected from weather station USC00452157. These 30-year averages are the standard reference for typical weather conditions.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USC00452157. For informational purposes only.
Read our methodology — how this data is sourced, computed, and verified.
Related
Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainClimate Editorial
