Annual mean
Annual mean of daily highs
Annual mean of daily lows
Unionville CDP, Montana
Official LSAD Designation: Unionville CDP • Census GEOID: 3075905
• Lewis and Clark County
Climate Normals & Weather Observations
30-year climate normals (1991–2020) and weather observations for Unionville CDP.
Reference Weather Station: HELENA RGNL AP, MT US (ID: USW00024144)
• Located 7.1 miles from community center
• Elevation: 1,166.8 m
| Month | Average High (°F) | Average Low (°F) | Mean Temp (°F) | Precipitation (in) |
|---|---|---|---|---|
| January | 32.4° | 13.5° | 23.0° | 0.39" |
| February | 37.2° | 17.2° | 27.2° | 0.42" |
| March | 47.5° | 24.6° | 36.1° | 0.52" |
| April | 56.7° | 32.4° | 44.5° | 1.02" |
| May | 66.4° | 41.5° | 53.9° | 1.95" |
| June | 74.7° | 48.7° | 61.7° | 2.21" |
| July | 86.1° | 55.1° | 70.6° | 1.06" |
| August | 84.6° | 52.9° | 68.8° | 1.04" |
| September | 73.3° | 44.6° | 58.9° | 0.96" |
| October | 57.6° | 33.5° | 45.5° | 0.78" |
| November | 42.8° | 22.8° | 32.8° | 0.59" |
| December | 32.6° | 14.2° | 23.4° | 0.46" |
Annual Temperature History
2010–2025, completed calendar years only.
NOAA station HELENA RGNL AP, MT US (ID: USW00024144) • 7.1 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 | 43.6 | 55.2 | 32.1 |
| 2011 | 44.8 | 56.9 | 32.7 |
| 2012 | 47.2 | 59.8 | 34.6 |
| 2013 | 46.3 | 58.4 | 34.2 |
| 2014 | 45.8 | 57.8 | 33.8 |
| 2015 | 48.3 | 60.7 | 35.9 |
| 2016 | 47.8 | 59.9 | 35.7 |
| 2017 | 45.4 | 57.7 | 33.1 |
| 2018 | 44.7 | 56.5 | 32.9 |
| 2019 | 42.7 | 54.0 | 31.3 |
| 2020 | 47.4 | 59.7 | 35.0 |
| 2021 | 48.1 | 60.7 | 35.6 |
| 2022 | 45.7 | 58.0 | 33.5 |
| 2023 | 47.7 | 59.3 | 36.1 |
| 2024 | 48.5 | 60.8 | 36.1 |
| 2025 | 47.2 | 59.3 | 35.1 |
Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.