NOAA Climate Normals 1991-2020
US County Climate & Weather Data
30-year climate normals for every US county — average temperatures, precipitation, snowfall, and extreme heat days.
Counties
3,144
States
51
Nat'l Avg Temp
54.5°F
Data Source
NOAA NCEI
30-Year Normals
San Francisco County
California
Avg Annual Temp
56.9°F
Warm Climate
Avg Jan Temp
52.3°F
Avg Jul Temp
59.2°F
Annual Precip
21.8"
Annual Snowfall
0.0"
2 days above 90°F per year
The cool maritime heart of California
San Francisco averages 56.9°F, which is cooler than many parts of the U.S. West Coast. Its 21.8 inches of rain is near the national average but concentrated in winter months.
Climate Data for Every US County
Each county page includes 30-year NOAA climate normals covering the full climate profile.
Temperature
Annual average, January low, July high, and summer vs winter comparison.
Precipitation
Annual rainfall, monthly averages, and total liquid equivalent precipitation.
Snowfall
Annual snowfall totals, peak snow months, and days with snow on ground.
Extreme Heat
Days exceeding 90°F and 100°F per year — critical for HVAC and outdoor planning.
Browse by State
Select a state to view climate data for every county.
Alabama
67 counties
Alaska
30 counties
Arizona
15 counties
Arkansas
75 counties
California
58 counties
Colorado
64 counties
Connecticut
9 counties
Delaware
3 counties
District of Columbia
1 county
Florida
67 counties
Georgia
159 counties
Hawaii
5 counties
Idaho
44 counties
Illinois
102 counties
Indiana
92 counties
Iowa
99 counties
Kansas
105 counties
Kentucky
120 counties
Louisiana
64 counties
Maine
16 counties
Maryland
24 counties
Massachusetts
14 counties
Michigan
83 counties
Minnesota
87 counties
Mississippi
82 counties
Missouri
115 counties
Montana
56 counties
Nebraska
93 counties
Nevada
17 counties
New Hampshire
10 counties
New Jersey
21 counties
New Mexico
33 counties
New York
62 counties
North Carolina
100 counties
North Dakota
53 counties
Ohio
88 counties
Oklahoma
77 counties
Oregon
36 counties
Pennsylvania
67 counties
Rhode Island
5 counties
South Carolina
46 counties
South Dakota
66 counties
Tennessee
95 counties
Texas
254 counties
Utah
29 counties
Vermont
14 counties
Virginia
133 counties
Washington
39 counties
West Virginia
55 counties
Wisconsin
72 counties
Wyoming
23 counties
Weather-Ready Resources
Tools and products for any climate.
Ambient Weather
Personal Weather Stations
Track your own hyperlocal weather with professional-grade home stations.
Shop Weather Stations →Sponsored
HVAC & Climate Control
Find the right heating and cooling systems for your county's climate.
Compare HVAC Options →REI
Outdoor Gear
Prepare for your local climate with the right gear for every season.
Browse Outdoor Gear →Powered by NOAA Climate Data
All data comes from NOAA's National Centers for Environmental Information (NCEI). Climate normals are 30-year averages computed from 1991 to 2020 across thousands of weather stations, aggregated to county level.
Learn about NOAA Climate Normals