High temperaturesForecast day 1
2.3°Ftypical miss
0°3°F8°+
75% came within 3°F
Usually coolerUsually warmer0.3°F warmer than observed
Local temperature forecast performance
How accurate are temperature forecasts in Casper, Wyoming?
Nighttime lows were less predictable than daytime highs in Casper's next-day record. Lows missed by 4.3°F on average, compared with 2.3°F for highs.
See the current Casper forecast
Opens ZIP 82601 using the nearest current station, which may differ from the archive station below.
What stands out
Casper forecast findings
- The strongest monthly directional tendency appeared in January lows, when forecasts averaged 4.3°F cooler than observed.
- Error increased more quickly for daily high forecasts. From forecast day 1 to day 7, their typical miss grew by 3.7°F; day-7 errors reached 6.0°F for highs and 6.3°F for lows.
- On forecast day 1, September highs had the smallest typical miss (1.5°F), while January lows had the largest (5.8°F).
- Across days 1, 3, 5, and 7, Casper's typical error was 1.0°F higher than the national archive average.
At a glance
Forecast day 1 accuracy
Highs Lows
Higher error than the national average
Casper: 4.6°F typical miss National archive average: 3.5°F
Combined high and low results across forecast days 1, 3, 5, and 7.Low temperaturesForecast day 1
4.3°Ftypical miss
0°3°F8°+
46% came within 3°F
Usually coolerUsually warmer0.5°F cooler than observed
Error generally grows farther into the forecast
The dots show the typical miss on each forecast day.
See within-3°F percentages and window timing
Day 1High: 75%Low: 46%
Day 3High: 64%Low: 43%
Day 5High: 51%Low: 37%
Day 7High: 37%Low: 31%
High and low windows represent the same numbered forecast day, but the high window ends 12 hours later and therefore has 12 more hours of lead time.
How forecasts change through the year
Each tile is forecast day 1’s typical miss.
Under 2°F2–3°F3–5°FOver 5°FNot enough data
Forecasts ran coolerLittle tendencyForecasts ran warmer
High temperatures
Jan3.0°60 cases
Feb3.5°51 cases
Mar2.4°60 cases
Apr2.9°60 cases
May2.3°58 cases
Jun2.1°60 cases
Jul1.7°60 cases
Aug1.8°58 cases
Sep1.5°60 cases
Oct2.0°61 cases
Nov2.5°51 cases
Dec2.7°57 cases
Low temperatures
Jan5.8°60 cases
Feb5.4°50 cases
Mar4.9°60 cases
Apr4.3°58 cases
May3.5°59 cases
Jun3.4°60 cases
Jul3.0°59 cases
Aug3.2°58 cases
Sep3.6°60 cases
Oct4.1°61 cases
Nov5.3°52 cases
Dec5.3°57 cases
Data locationCASPER/NATRONA INTL (CPR)8.6 miles from central Casper · Archive 2024-08-01–2026-07-28
Based on archived raw NBM forecasts compared with observed daily highs and lows near Casper. Results describe this model archive, not every forecast provider.
How these numbers are calculated
The forecasts are raw NBM median temperature guidance initialized at 12Z. Results include multiple NBM model eras and are retrospective, so they describe this archive rather than guaranteeing future performance.
“Typical miss” is mean absolute error: the average size of the error regardless of direction. Warmer or cooler tendency is signed bias, which can be small even when individual errors are larger.