Climate Comfort Score
54/100
Moderate
NOAA 1991–2020 normals 47°F annual avg Public-domain federal data
Casper, WY Climate
Annual temperature, rainfall, and a comfort score, sourced from NOAA NCEI's 1991–2020 normals →
- 47°F
- Avg annual temp
- 54/100
- Comfort score
- 15.9"
- Annual precip
- 142d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for Casper
Casper, Wyoming averages 47°F a year and scores 54/100 on the comfort index - moderate, milder than 27% of U.S. cities.
- 47°F
- yearly average temperature, NOAA normal
- 54/100
- comfort score, milder than 27% of U.S. cities
- 15.9"
- annual precipitation
- 142 days
- frost-free growing season
Based on NOAA U.S. Climate Normals (1991–2020) - 30-year averages describing the typical year, not a forecast.
Avg Temperature
47°F (8°C)
Avg High
60°F
Avg Low
34°F
Annual Precip
15.9"
Comfort Score
54/100
Moderate
Avg Annual Temperature
47°F
30-year mean (NOAA NCEI)
Annual Precipitation
15.9"
Liquid-equivalent total
Comfort score vs national 100-point ceiling (Casper) 54.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Moderate for the Casper area.
How Casper compares to every U.S. city
Casper's comfort score vs. all U.S. cities
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
54 Top 73% higher than 27% of 6,915 US cities
Each bar is a band; taller bars hold more US cities. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Warming context for Casper
MethodologyZooming out from Casper's own normal, the chart below shows how the U.S. land temperature anomaly has tracked the global mean since 1900 - the most recent decade sits warmer than the 30-year mean shown here.
- 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 | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 37°F (3°C) | 16°F (-9°C) | 27°F (-3°C) | 0.5" | 27.6 | 0.0 |
| February | 39°F (4°C) | 17°F (-8°C) | 28°F (-2°C) | 1.0" | 24.0 | 0.0 |
| March | 50°F (10°C) | 25°F (-4°C) | 37°F (3°C) | 1.6" | 21.9 | 0.0 |
| April | 56°F (13°C) | 31°F (0°C) | 44°F (6°C) | 1.8" | 15.5 | 0.0 |
| May | 65°F (18°C) | 40°F (4°C) | 52°F (11°C) | 2.8" | 4.5 | 0.0 |
| June | 78°F (26°C) | 50°F (10°C) | 64°F (18°C) | 1.5" | 0.0 | 4.7 |
| July | 87°F (31°C) | 57°F (14°C) | 72°F (22°C) | 1.2" | 0.0 | 12.2 |
| August | 86°F (30°C) | 54°F (12°C) | 70°F (21°C) | 1.0" | 0.0 | 10.0 |
| September | 75°F (24°C) | 45°F (7°C) | 60°F (16°C) | 1.2" | 1.0 | 2.3 |
| October | 60°F (16°C) | 34°F (1°C) | 47°F (8°C) | 1.7" | 13.4 | 0.0 |
| November | 48°F (9°C) | 26°F (-3°C) | 37°F (3°C) | 0.9" | 21.4 | 0.0 |
| December | 37°F (3°C) | 17°F (-8°C) | 27°F (-3°C) | 0.8" | 26.9 | 0.0 |
Monthly Precipitation
Average monthly rainfall
January 0.5"
February 1.0"
March 1.6"
April 1.8"
May 2.8"
June 1.5"
July 1.2"
August 1.0"
September 1.2"
October 1.7"
November 0.9"
December 0.8"
Frost Dates & Growing Season
First Fall Freeze
October 1
50% probability date
Last Spring Freeze
May 12
50% probability date
Growing Season
142 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
7,016
Higher = more heating needed
Cooling Degree Days
514
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
What Casper's climate means for you
Casper runs 47°F a year - peaking in July, coldest in January.
- Gardeners get about 142 frost-free days, with the last spring freeze near May 12 - plan the planting calendar around it, not the regional average.
- Energy bills track 7,016 heating and 514 cooling degree days a year, higher means the furnace or AC runs more.
- Comparing places to live? Line this city up against nearby cities and the national rankings. See rankings
These are 30-year NOAA normals (1991–2020) - the typical year, not a forecast for any specific season.
Climate Guides
Climate Insight: Casper, WY
The NOAA 1991–2020 climate normals describe Casper, Wyoming as a location with an annual average temperature of 47°F, ranging from a mean daily high of 60°F to a mean daily low of 34°F. July is typically the warmest month of the year, while January is the coldest. These thirty-year averages, computed from station USC00481572, smooth out year-to-year variability and give a baseline expectation for typical conditions in any given month.
Beyond temperature, Casper averages 15.9 inches of precipitation annually, predominantly as rainfall - a real factor for anyone planning to live, garden, or travel here. The frost-free season averages 142 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near May 12 and the first fall freeze near October 1. Turning to energy use, 7,016 heating degree days and 514 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Casper scores 54/100 (Moderate), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. Shoulder seasons bring the mildest highs and lows in the monthly tables above, summer brings July-driven heat, and winter brings January-driven cold - use that rhythm for planning. These figures are thirty-year averages rather than forecasts, so a specific year may still run warmer, cooler, wetter, or drier than what's shown.
Frequently Asked Questions
What is the average temperature in Casper, WY? ▼
The average annual temperature in Casper, Wyoming is 47°F. The warmest month averages 87°F (31°C) and the coldest averages 16°F (-9°C).
How much rain does Casper get? ▼
Casper receives 15.9 inches of precipitation annually. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Casper? ▼
Casper has a climate comfort score of 54/100 (Moderate), milder than 27% of U.S. cities in the PlainClimate database.
When is the growing season in Casper? ▼
Casper has approximately 142 frost-free days per year, with the last spring freeze around May 12 and the first fall freeze around October 1.
How much energy does heating and cooling require in Casper? ▼
Casper has 7,016 heating degree days and 514 cooling degree days annually, a heating-dominated climate. See our <a href="/guides/reading-weather-data/" class="underline hover:text-brand-600">guide to reading weather data</a> for what these figures mean.
Where does this Casper climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USC00481572 near Casper.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USC00481572. 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
Every figure on PlainClimate is rendered directly from NOAA 1991-2020 U.S. Climate Normals data, no number is typed in by an editor. This page draws directly on NOAA 1991-2020 U.S. Climate Normals data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.