West Fork Ranger Station · Photo: Jon Roanhaus · CC BY-SA 4.0Less rain and snow falls on Conner than on 93% of U.S. towns: 15 inches a year
July afternoons average 84°. Only 68° separates winter nights from summer afternoons. By January nights alone, it runs colder than 72% of U.S. towns. Seedlings are safe outdoors from about May 24, with the first autumn frost due around September 23.
A year in Conner at a glance
Each month’s typical high and low, and what it brings.
What stands out about Conner’s climate
Compared with towns across the U.S., with Conner’s place in Montana beside it.
What a year in Conner feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 118 frost-free days a year
In half of years the last 32° night comes by May 24 and the first by September 23. Frost and day counts come from NOAA’s station at Darby, MT, 7 miles from the town’s center, 190 ft lower.
The 2023 USDA map puts Conner’s center in zone 5b: the coldest night of a typical winter, averaged over 1991–2020, reaches about −11°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 15 inches of rain a year
June is the wettest month and August the driest.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Conner
98% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October through May.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Darby, MT.
Living with Conner’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
118 frost-free days in zone 5b. The last frost comes by May 24 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Sep 23.
Months with highs of 62–84° and lows of 40° or more: June and August. 1.4 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Conner from natural hazards, wildfire is the largest share (65%); heat waves, cold waves, winter storms and ice storms together are 2%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Conner and similar climates
TownRatings has no climate map of the towns around Conner yet.
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
Warmer than it used to be
The last 30 years in Conner averaged 1.2° warmer than the 1900s. The biggest change is in January (+3.6°).
A smaller shift than in 60% 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 Conner compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Conner’s place among Montana’s.
Conner weather by month
Highs, lows and precipitation from NOAA’s grid at Conner’s center. 1991–2020 normals.
| Month | High | Low | Rain + melt | 30-yr range |
|---|---|---|---|---|
| January | 34° | 18° | 1.2" | 15° – 32° |
| February | 39° | 19° | 1.0" | 19° – 36° |
| March | 49° | 26° | 1.0" | 31° – 43° |
| April | 56° | 31° | 1.1" | 39° – 50° |
| May | 66° | 38° | 1.7" | 47° – 56° |
| June | 74° | 44° | 2.0" | 56° – 66° |
| July | 84° | 49° | 0.9" | 57° – 73° |
| August | 83° | 47° | 0.8" | 59° – 69° |
| September | 73° | 39° | 1.1" | 53° – 61° |
| October | 58° | 31° | 1.2" | 38° – 51° |
| November | 42° | 24° | 1.3" | 25° – 40° |
| December | 32° | 17° | 1.5" | 18° – 30° |
| Year | 58° | 32° | 14.9" |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 19° to 36°. September is the most reliable, staying within 8°.
Where Conner’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 Conner’s center.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Darby, MT, 7 miles from the town’s center, 190 ft lower; the nearest station that passes our checks for distance, height and agreement with the grid.
- 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 Conner’s climate
What is the weather like in Conner?
A typical July afternoon reaches 84°, a January night drops to 18°. Colder January nights than 72% of U.S. towns; cooler July afternoons than 56% of U.S. towns.
How cold does it get in Conner in winter?
December nights average 17°. About 167 nights a year reach 32° or below and 7 reach 0° or below. In the coldest December of the last 30 years the month averaged 18°.
How hot does it get in Conner?
July, with a typical high of 84° and a low of 49°. About 22 days a year reach 90° and 1 reach 100° (Darby, MT).
When is the first and last frost in Conner?
In half of years the last spring frost (32°) comes by May 24 and the first fall frost by September 23, about 118 frost-free days, at Darby, MT.
What growing zone is Conner in?
Zone 5b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −11°.
What is the best time of year to visit Conner?
By one simple rule (highs of 62–84° and lows of 40° or more), June and August. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Conner getting warmer?
Yes: 1991–2020 averaged 1.2° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 60% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Conner.
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.