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
54.8°F
Data Source
NOAA NCEI
30-Year Normals
How WeatherByCounty Works
Find, compare, and understand climate data across America
Step 1
Find your county
Search by name or browse by state to access 30-year NOAA climate normals for any of 3,100+ US counties.
Step 2
Compare climates
Side-by-side comparison of temperature, precipitation, snowfall, and growing season across up to 3 counties.
Step 3
Explore the map
Interactive choropleth map showing temperature, precipitation, snowfall, and extreme heat days nationwide.
Step 4
Dig into insights
Data-driven articles and national rankings reveal the best weather counties, mildest winters, and climate risks.
Interactive Climate Tools
Explore, compare, and analyze climate data across all 3,100+ US counties.
Compare Counties
Side-by-side comparison of temperature, precipitation, snowfall, and growing season for up to 3 counties.
Start ComparingInteractive Map
Color-coded choropleth map showing temperature, precipitation, snowfall, and extreme heat days nationwide.
Open the MapClimate Guides
Data-driven articles on the best weather counties, extreme heat, gardening climates, and more.
Browse ArticlesClimate Insights
National analytics with 5 interactive charts: state rankings, temperature distribution, seasonal swings, and extreme heat.
View InsightsClimate Guides & Rankings
Data-driven articles on weather, climate, and living conditions across America.
Article
Understanding Climate Patterns by County
A data-driven look at how climate varies across US counties — from the hottest deserts to the coldest tundra. Analyzing temperature, precipitation, and snowfall patterns using 30-year NOAA normals.
Article
Best Weather Counties in America: Where to Find Ideal Climates
The 25 counties with the most comfortable climates in the US, ranked by temperature moderation, balanced precipitation, and freedom from extreme heat. Find your ideal weather.
Article
Extreme Weather Events: Which Counties Are Most Affected?
Which US counties face the most extreme heat, heaviest snowfall, and biggest seasonal temperature swings? Data analysis of NOAA climate normals reveals the most weather-challenged counties.
Article
Best Counties for Gardening by Growing Season
The 25 US counties with the longest growing seasons, ranked by frost-free days and growing degree days. Ideal for gardeners, farmers, and anyone who wants to grow their own food.
Article
Counties with the Most Extreme Heat Days
The 25 US counties that endure the most days above 90°F annually. Data analysis of NOAA climate normals reveals where extreme heat is a persistent feature of daily life.
Article
Best Counties for Allergy Sufferers
The 25 most allergy-friendly counties in America, ranked by a climate comfort index that considers humidity, temperature, snowfall, and extreme heat.
Greenville County
South Carolina
Avg Annual Temp
59.4°F
Warm Climate
Avg Jan Temp
40.7°F
Avg Jul Temp
77.1°F
Annual Precip
57.1"
Annual Snowfall
3.0"
35 days above 90°F per year
Moderate temperatures and high rain
Greenville County averages 59.4°F, which is closer to the national median than its coastal counterparts. However, its 57.1 inches of annual rain is significantly higher than the national average.
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 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
Climate FAQs
What is the average temperature in the United States?
Which county has the hottest climate in America?
Which county has the coldest climate in America?
Where does it rain the most in the United States?
What are NOAA Climate Normals?
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