Bar Nunn, Casper Weather
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Climate of Bar Nunn: monthly averages
Based on 25 years of satellite and reanalysis data (2001-2025), July is usually the hottest month in Bar Nunn, with average daytime highs around 32°C. January is the coolest, when nights typically fall to about -9°C and frost is possible on the coldest nights. That is a wide yearly range of roughly 41°C, so the seasons feel very different from each other.
The area receives about 400 mm of rain in a typical year. Rainfall is modest in every month; May is the wettest at about 71 mm.
For outdoor plans and travel, June to September usually offer the most comfortable weather in Bar Nunn, with mild days and relatively little rain.
| Month | Avg high | Avg low | Rainfall | Humidity |
|---|---|---|---|---|
| Jan | 2° | -9° | 18 mm | 70% |
| Feb | 3° | -9° | 22 mm | 66% |
| Mar | 9° | -4° | 34 mm | 59% |
| Apr | 13° | -1° | 47 mm | 57% |
| May | 19° | 4° | 71 mm | 54% |
| Jun | 27° | 11° | 39 mm | 46% |
| Jul | 32° | 16° | 34 mm | 41% |
| Aug | 30° | 14° | 24 mm | 40% |
| Sep | 24° | 9° | 30 mm | 43% |
| Oct | 14° | 1° | 35 mm | 54% |
| Nov | 7° | -4° | 20 mm | 60% |
| Dec | 1° | -9° | 21 mm | 69% |
Source: NASA POWER (MERRA-2 reanalysis), averaged over the roughly 50 km grid area around Bar Nunn. Values describe typical conditions, not a forecast.
About Bar Nunn weather
Bar Nunn is set in Wyoming's high-plains and mountain climate, exposed and wind-prone, about 2 km north-east of Casper. Summers bring warm days and cool nights (June–August). The year winds down with long, cold, windy winters (November–March) with significant snowfall. This page shows live, auto-refreshing weather for Bar Nunn: current conditions, an hourly breakdown, a 16-day outlook, a date-lookup tool for any past or future date, and real-time air quality, sourced from Open-Meteo. Local timezone: America/Denver.
Frequently asked questions
Bar Nunn is about 2 km north-east of Casper, in Wyoming.
Bar Nunn sees long, cold, windy winters (November–March) with significant snowfall.
The live current conditions, hourly forecast and 16-day outlook above are pulled in real time for Bar Nunn's exact coordinates. No fixed schedule, the page updates whenever you load it.
July is usually the hottest month in Bar Nunn, with average daytime highs of about 32°C and nights around 16°C.
The coldest nights come in January, when the average low is about -9°C and daytime highs reach around 2°C. Frost is possible on clear, calm nights.
Bar Nunn receives about 400 mm of rain in a typical year. May is the wettest month at roughly 71 mm; no month averages more than 100 mm.
June to September usually offer the most comfortable weather in Bar Nunn, with mild daytime temperatures and little rain.
In November Bar Nunn typically sees daytime highs near 7°C and lows near -4°C, with about 20 mm of rain over the month and average humidity around 60%. Check the live forecast above for this week's actual conditions.
Up to 16 days ahead using the extended forecast and date picker above; further-out or historical dates use the same date lookup tool.
Live temperature for Bar Nunn is shown at the top of this page and refreshes automatically — see the hourly breakdown below for how it changes through the day.
Bar Nunn's day-to-day weather follows the broader pattern of Wyoming described above. See the hourly weather forecast or the air quality index for more detail.