Klein’s winters are colder and snowier than most of the U.S.
A typical July afternoon reaches 87°, a January night drops to 13°, and about 24 inches of snow falls in a normal winter.
A year in Klein at a glance
Each month’s typical high and low, and what it brings.
What stands out about Klein’s climate
Compared with towns across the U.S., with Klein’s place in Montana beside it.
What a year in Klein feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 124 frost-free days a year
In half of years the last 32° night comes by May 20 and the first by September 21. Frost and day counts come from NOAA’s station at Roundup, MT, 2.9 miles from the town’s center, 270 ft lower.
The 2023 USDA map puts Klein’s center in zone 4b: the coldest night of a typical winter, averaged over 1991–2020, reaches about −22°. 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 24 inches of snow a winter
Snow, measured at Roundup, MT, falls mostly in January and December. Precipitation (rain plus melted snow) adds up to 15 inches a year; June is the wettest month and January the driest. Rain or snow falls on about 74 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Klein
94% 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 Roundup, MT.
Living with Klein’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
124 frost-free days in zone 4b. The last frost comes by May 20 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 21.
Months with highs of 62–84° and lows of 40° or more: June and September. 5.6 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Klein from natural hazards, wildfire is the largest share (35%); heat waves, cold waves, winter storms and ice storms together are 25%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Klein and similar climates
TownRatings has no climate map of the towns around Klein yet.
Climates most like Klein’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Klein, MT | 13° | 87° | 15" | 24" |
| Glenwood Springs, CO | 14° | 87° | 15" | 39" |
| Raton, NM | 15° | 85° | 16" | 25" |
| Ephraim, UT | 14° | 89° | 12" | 20" |
| Shelley, ID | 14° | 87° | 11" | 15" |
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 Klein averaged 1.2° warmer than the 1900s. The biggest change is in January (+3.8°).
A smaller shift than in 62% 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 Klein compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Klein’s place among Montana’s.
Klein weather by month
Highs, lows and precipitation from NOAA’s grid at Klein’s center; snow, wet days and snow on the ground from Roundup, MT. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 36° | 13° | 0.4" | 5.2" | 4 | 11 | 14° – 36° |
| February | 40° | 15° | 0.4" | 3.9" | 4 | 6 | 4° – 39° |
| March | 50° | 23° | 0.7" | 4.4" | 5 | 3 | 23° – 45° |
| April | 58° | 31° | 1.7" | 1.4" | 8 | 1 | 38° – 49° |
| May | 68° | 40° | 2.8" | 0.1" | 10 | 0 | 49° – 58° |
| June | 78° | 49° | 2.9" | 0.0" | 11 | 0 | 58° – 69° |
| July | 87° | 54° | 1.6" | 0.0" | 7 | 0 | 60° – 78° |
| August | 87° | 52° | 1.1" | 0.0" | 5 | 0 | 63° – 75° |
| September | 75° | 43° | 1.2" | 0.0" | 5 | 0 | 55° – 65° |
| October | 60° | 32° | 1.2" | 1.0" | 7 | 0 | 38° – 51° |
| November | 46° | 22° | 0.5" | 2.8" | 4 | 2 | 25° – 42° |
| December | 37° | 15° | 0.5" | 5.6" | 5 | 8 | 15° – 35° |
| Year | 60° | 32° | 14.9" | 24.4" | 74 | 31 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 4° to 39°. May is the most reliable, staying within 9°.
Where Klein’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 Klein’s center.
- Snow: Roundup, MT.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Roundup, MT, 2.9 miles from the town’s center, 270 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 Klein’s climate
What is the weather like in Klein?
A typical July afternoon reaches 87°, a January night drops to 13°, and about 24 inches of snow falls in a normal winter. Colder January nights than 90% of U.S. towns; hotter July afternoons than 64% of U.S. towns.
How cold does it get in Klein in winter?
January nights average 13°. About 163 nights a year reach 32° or below and 17 reach 0° or below. In the coldest January of the last 30 years the month averaged 14°.
How much snow does Klein get?
About 24 inches in a normal winter at Roundup, MT, most of it in January and December, with snow on the ground about 31 days a year.
How hot does it get in Klein?
July, with a typical high of 87° and a low of 54°. About 44 days a year reach 90° and 6 reach 100° (Roundup, MT).
When is the first and last frost in Klein?
In half of years the last spring frost (32°) comes by May 20 and the first fall frost by September 21, about 124 frost-free days, at Roundup, MT.
What growing zone is Klein in?
Zone 4b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −22°.
What is the best time of year to visit Klein?
By one simple rule (highs of 62–84° and lows of 40° or more), June and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Klein getting warmer?
Yes: 1991–2020 averaged 1.2° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 62% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Klein.
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.