Annual mean
Annual mean of daily highs
Annual mean of daily lows
Ismay town, Montana
Official LSAD Designation: Ismay town • Census GEOID: 3038950
• Custer County
Climate Normals & Weather Observations
30-year climate normals (1991–2020) and weather observations for Ismay town.
Reference Weather Station: PLEVNA, MT US (ID: USC00246601)
• Located 14.3 miles from community center
• Elevation: 847.3 m
| Month | Average High (°F) | Average Low (°F) | Mean Temp (°F) | Precipitation (in) |
|---|---|---|---|---|
| January | 29.9° | 6.2° | 18.0° | 0.48" |
| February | 33.3° | 10.2° | 21.8° | 0.50" |
| March | 45.3° | 20.3° | 32.8° | 0.70" |
| April | 56.7° | 30.1° | 43.4° | 1.55" |
| May | 67.0° | 40.5° | 53.7° | 2.90" |
| June | 76.8° | 50.0° | 63.4° | 2.65" |
| July | 86.3° | 56.1° | 71.2° | 1.86" |
| August | 85.5° | 54.0° | 69.8° | 1.35" |
| September | 75.1° | 44.1° | 59.6° | 1.48" |
| October | 58.1° | 31.3° | 44.7° | 1.16" |
| November | 43.2° | 18.9° | 31.0° | 0.58" |
| December | 32.4° | 8.6° | 20.5° | 0.43" |
Annual Temperature History
2010–2025, completed calendar years only.
NOAA station PLEVNA, MT US (ID: USC00246601) • 14.3 miles from community center .
This is the same reference station used for monthly normals.
Source: NOAA NCEI Global Summary of the Year.
Annual temperature data table (°F)
| Year | Annual mean (°F) | Annual mean of daily highs (°F) | Annual mean of daily lows (°F) |
|---|---|---|---|
| 2010 | 42.3 | 55.0 | 29.6 |
| 2011 | 42.7 | 55.7 | 29.7 |
| 2012 | Unavailable | 61.7 | Unavailable |
| 2013 | 43.3 | 55.8 | 30.8 |
| 2014 | 42.7 | 55.5 | 29.9 |
| 2015 | 46.2 | 60.2 | 32.2 |
| 2016 | 46.3 | 60.2 | 32.3 |
| 2017 | Unavailable | Unavailable | Unavailable |
| 2018 | 42.2 | 55.1 | 29.2 |
| 2019 | 41.3 | 53.5 | 29.0 |
| 2020 | 45.2 | 59.2 | 31.1 |
| 2021 | 46.2 | 60.9 | 31.5 |
| 2022 | 43.1 | 56.5 | 29.7 |
| 2023 | 45.0 | 58.2 | 31.8 |
| 2024 | 46.5 | 60.7 | 32.3 |
| 2025 | 44.9 | 58.5 | 31.3 |
Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.