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Casper weather in numbers
measured normals and 10 years of recorded weather
Casper swings 71°F across the year, from 87°F highs in July to 16°F lows in January, and May is usually the wettest month in a year that brings about 12 in of precipitation. Over 10 years of recorded weather it averages 97 days a year at 77°F or above, 55 of them at 86°F or above, 150 frost nights, and rain on 73 days.
Warmest month
July
87°F average high
Coldest month
January
16°F average low
Wettest month
May
12 in a year
Comfortable
2 months
June and September
Residents
60,000
share this forecast
Most accurate here
European
85/100 CheckWeather Score
Warm days
97 days
a year at 77°F or above
Frost nights
150 nights
a year below 32°F
Rain days
73 days
a year with 0.04 in or more
Day counts are from the ERA5 reanalysis for Casper’s grid square, 2016 to 2025, counted the same way for every city so the numbers compare. A reanalysis square is an area, not a weather station, so it is good for counting days and not for a single day’s record.
The weather map: all three models at once
NWS, American, European side by side around Casper and nearby towns.Live rain radar →
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Casper hourly forecast: next 14 hours
consensus of the three models
Rain in the next 24 hours, model by model
each model's own hourly precipitation, side by side
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Casper 10-day forecast, out to 14 days
where the models agree, and where they split
Today
Cloudy
48°35°
models agree
Tomorrow
Cloudy
51°34°
models agree
Mon
Light drizzle
56°39°
±5°
Tue
Mostly clear
58°42°
±9°
Wed
Cloudy
62°39°
±5°
Thu
Cloudy
63°43°
±4°
Fri
Light snow
65°46°
±6°
Sat
Light snow
60°44°
±5°
Sun
Light snow
53°37°
±9°
Mon
Clear
58°38°
models agree
Tue
Mostly clear
61°39°
±4°
Wed
Clear
57°39°
±21°
Thu
Clear
58°40°
±16°
Casper, Wyoming (WY) is at its warmest in Jul (average highs near 87°F) and coldest in Jan (lows around 16°F), with roughly 12 in of precipitation across the year. Below, compare what NWS, American, European forecast for Casper right now, and see exactly where they disagree.
average daytime high and overnight low across a typical year (1991-2020)
Jan
30°
16°
Feb
33°
19°
Mar
43°
23°
Apr
51°
31°
May
64°
41°
Jun
76°
52°
Jul
87°
59°
Aug
84°
59°
Sep
74°
48°
Oct
57°
34°
Nov
42°
26°
Dec
34°
20°
Source: 1991-2020 averages, ERA5 for this place adjusted with NASA POWER.
How Casper's weather has changed since 1995
30 years of daily data, 1995-2024, shown as change
+1.1°F
Around Casper, the difference between 1995-2004 and 2015-2024 is +1.1°F, within the normal swing from year to year.
1995each stripe is one year2024
cooler than averagearound averagewarmer than average
Days above 95°F
2 more days a year
2015-2024 against 1995-2004. Within the normal year-to-year swing
Frost nights
8 fewer nights a year
2015-2024 against 1995-2004, below 32°F. Within the normal year-to-year swing
Average wind
+2%
2015-2024 against 1995-2004. Within the normal year-to-year swing
Bars: each year against the area's 30-year average. Dashed lines: the average of the first and the last ten years.
See the numbers year by year
Year
Temp vs average
Days >95°F vs avg
Frost nights vs avg
Wind vs avg
1995
−2.0°F
−6
+15
−1%
1996
−1.6°F
−7
+17
+5%
1997
−2.0°F
−8
+9
−1%
1998
−0.2°F
−5
−5
−8%
1999
+0.9°F
−4
−6
+1%
2000
+0.5°F
+4
+1
−1%
2001
+1.1°F
+10
+4
−6%
2002
−0.7°F
+9
+16
+1%
2003
+0.9°F
+8
−5
−1%
2004
−0.4°F
−8
−10
−3%
2005
+0.5°F
−2
−3
−5%
2006
+0.5°F
−3
+2
+3%
2007
+0.3°F
+7
−13
−1%
2008
−2.2°F
−4
+11
+3%
2009
−2.5°F
−9
+18
−3%
2010
−1.1°F
−5
+2
−1%
2011
−1.3°F
−4
+9
+5%
2012
+3.2°F
+15
−32
+3%
2013
−0.7°F
−4
+18
−1%
2014
−0.6°F
−4
−0
+1%
2015
+1.6°F
−8
−21
−5%
2016
+1.6°F
+2
−24
+3%
2017
+0.7°F
−4
−19
−1%
2018
+0.2°F
−2
+3
−3%
2019
−1.8°F
−6
+21
+1%
2020
+0.7°F
+6
+5
+5%
2021
+1.2°F
+8
−0
+1%
2022
+0.2°F
+9
+7
+3%
2023
+0.2°F
−5
−3
−1%
2024
+3.0°F
+6
−10
+1%
Source: NASA POWER daily data from the MERRA-2 reanalysis, 1995-2024. Each value describes a grid square of about 50 km around Casper, not a weather station, and a square that takes in sea or a large lake runs milder than the city itself. That is why this section shows change against the square's own 30-year average rather than counts you could compare with a local station. Rain and snow are left out because their long-term record in this dataset is not consistent over time. "Within the normal year-to-year swing" means the change is smaller than the usual differences between single years.
Which forecast is most accurate in Casper?
CheckWeather Score, graded against the weather that actually happened
Provider
CheckWeather-score
Temp
Wind
Rain
Run by
European ★ Best
85
/100rank #1
87±1.3°F
86±4.5 mph
8290% hit
ECMWF - European Centre for Medium-Range Weather ForecastsReading, United Kingdom
American
75
/100rank #2
82±1.8°F
89±3.5 mph
5877% hit
NOAA / NCEP (United States)College Park, Maryland, USA
The accuracy above is the measured record. This is your opinion: which forecast service do you trust most in United States? Give each 1 to 5 stars.
NWSNational Blend (NBM)
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EuropeanECMWF
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Where the models disagree
temperature and rain, judged separately
Day
Temperature
Rain
Today
±1°48° to 48°
±7%1% to 8% chance
Tomorrow
±4°49° to 53°
±8%13% to 21% chance
Mon
±5°53° to 58°
models agree24% to 24% chance
Tue
±9°54° to 63°
±12%7% to 19% chance
Wed
±5°59° to 64°
±1%7% to 8% chance
The models often agree on temperature and still split on rain, and rain is usually what decides whether a plan survives. A wide rain range means the shower is genuinely uncertain, not that the forecast is wrong.
Sunrise and sunset in Casper
today, local time
Sunrise
07:29
Sunset
18:08
Daylight
10h 39m
Common questions
What's the weather in Casper today?
Saturday, October 24: NWS, the American and the European model agree on a high near 48° in Casper today. Tomorrow: cloudy, around 51°, with a 21% chance of rain. The forecast on this page refreshes live.
Will it rain in Casper today or tomorrow?
The models split on rain in Casper on Sunday, October 25: NWS 21%, American 21%, European 13%. When they disagree like this, treat any single app's answer with caution. On Saturday, October 24 the highest chance of rain from any model is 8%. The hourly strip and the model-by-model rain panel above update live.
Which forecast is most accurate for Casper?
Over the last 30 days, the European model has been the most accurate for Casper (CheckWeather Score 85/100), ahead of the American at 75. We grade every model against the recorded weather. See the US accuracy scoreboard for the full method.
What is the warmest month in Casper?
July is typically the warmest month in Casper, with average highs around 87°F.
How cold does Casper get?
The coldest month in Casper is January, when overnight lows average about 16°F.
How much rain does Casper get?
Casper sees roughly 12 in of precipitation a year, with May usually the wettest month.
Is Casper getting warmer?
Not clearly. In NASA's reanalysis for the area around Casper, the difference between 1995-2004 and 2015-2024 is 1.1°F, within the normal swing from year to year.
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