St. Pierre’s winters are colder than most of the U.S.; July afternoons average 78°
A typical July afternoon reaches 78°, a January night drops to 13°.
A year in St. Pierre at a glance
Each month’s typical high and low, and what it brings.
What stands out about St. Pierre’s climate
Compared with towns across the U.S., with St. Pierre’s place in Montana beside it.
What a year in St. Pierre feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 19 inches of rain a year
June is the wettest month and March the driest.
Rain + melted snow by month
Inches of water
Living with St. Pierre’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
Zone 4b.
Months with highs of 62–84° and lows of 40° or more: June, July, August and September.
Parks & trails →Cold waves are 71% of the yearly building losses FEMA expects in St. Pierre from natural hazards, the largest share. Normals are averages; the hazards page covers the extremes.
Natural hazards →St. Pierre and its neighbors
Sangrey has the coldest January nights next door (10°, 3° colder) and Sangrey the hottest July afternoons (81°, 3° warmer). Differences under a degree are within what the 5 km grid can tell apart. Tap a town to see its climate.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
Warmer than it used to be
The last 30 years in St. Pierre averaged 1.7° warmer than the 1900s. The biggest change is in January (+5.1°).
A bigger shift than in 73% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How St. Pierre compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with St. Pierre’s place among Montana’s.
St. Pierre weather by month
Highs, lows and precipitation from NOAA’s grid at St. Pierre’s center. 1991–2020 normals.
| Month | High | Low | Rain + melt | 30-yr range |
|---|---|---|---|---|
| January | 32° | 13° | 0.8" | 10° – 36° |
| February | 34° | 14° | 0.8" | 0° – 39° |
| March | 42° | 20° | 0.7" | 14° – 40° |
| April | 51° | 28° | 1.6" | 34° – 44° |
| May | 61° | 37° | 2.9" | 45° – 54° |
| June | 69° | 44° | 3.7" | 53° – 61° |
| July | 78° | 50° | 2.2" | 55° – 71° |
| August | 78° | 49° | 1.4" | 58° – 69° |
| September | 67° | 41° | 1.6" | 49° – 60° |
| October | 53° | 31° | 1.7" | 35° – 48° |
| November | 41° | 21° | 1.0" | 18° – 41° |
| December | 34° | 15° | 0.8" | 10° – 33° |
| Year | 53° | 30° | 19.2" |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 0° to 39°. June is the most reliable, staying within 8°.
Where St. Pierre’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at St. Pierre’s center.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about St. Pierre’s climate
What is the weather like in St. Pierre?
A typical July afternoon reaches 78°, a January night drops to 13°. Colder January nights than 89% of U.S. towns; cooler July afternoons than 96% of U.S. towns.
How cold does it get in St. Pierre in winter?
January nights average 13°. In the coldest January of the last 30 years the month averaged 10°.
How hot does it get in St. Pierre?
July, with a typical high of 78°. 90° days are rare.
What growing zone is St. Pierre in?
Zone 4b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −25°.
What is the best time of year to visit St. Pierre?
By one simple rule (highs of 62–84° and lows of 40° or more), June, July, August and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is St. Pierre getting warmer?
Yes: 1991–2020 averaged 1.7° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 73% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in St. Pierre.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.