Osmond gets about 88 inches of snow a winter, more than 96% of U.S. towns
High summer brings afternoon highs near 82°. It is a dry place: less rain and snow fall here than on 91% of U.S. towns. Warming shows here too: 1.2° more than in 1901–2000, led by March. Garden planting can start around June 20; autumn frost returns near September 1.
A year in Osmond at a glance
Each month’s typical high and low, and what it brings.
What stands out about Osmond’s climate
Compared with towns across the U.S., with Osmond’s place in Wyoming beside it.
What a year in Osmond feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 71 frost-free days a year
In half of years the last 32° night comes by June 20 and the first by September 1. Frost and day counts come from NOAA’s station at Afton, WY, 4 miles from the town’s center, at about the same height.
The 2023 USDA map puts Osmond’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 88 inches of snow a winter
Snow, measured at Afton, WY, falls mostly in January. Precipitation (rain plus melted snow) adds up to 18 inches a year; May is the wettest month and July the driest. Rain or snow falls on about 111 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Osmond
Nearly all of the work is heating: a normal year has almost no cooling days. Months averaging under 55° run from September 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 Afton, WY.
Living with Osmond’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
71 frost-free days in zone 4b. The last frost comes by Jun 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 1.
Months with highs of 62–84° and lows of 40° or more: July and August. 1.8 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Osmond from natural hazards, avalanches are the largest share (67%); heat waves, cold waves, winter storms and ice storms together are 1%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Osmond and similar climates
TownRatings has no climate map of the towns around Osmond yet.
Climates most like Osmond’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 |
|---|---|---|---|---|
| Osmond, WY | 6° | 82° | 18" | 88" |
| Lewistown, MT | 12° | 82° | 18" | 112" |
| Hailey, ID | 10° | 84° | 14" | 102" |
| Minot, ND | 2° | 82° | 17" | 52" |
| Craig, CO | 6° | 86° | 14" | 113" |
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 Osmond averaged 1.2° warmer than the 1900s. The biggest change is in March (+3.1°).
A smaller shift than in 65% 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 Osmond compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Osmond’s place among Wyoming’s.
Osmond weather by month
Highs, lows and precipitation from NOAA’s grid at Osmond’s center; snow, wet days and snow on the ground from Afton, WY. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 29° | 6° | 1.6" | 21.8" | 12 | 31 | 11° – 24° |
| February | 33° | 8° | 1.4" | 15.0" | 11 | 27 | 16° – 27° |
| March | 43° | 17° | 1.4" | 12.2" | 9 | 23 | 25° – 36° |
| April | 52° | 25° | 1.6" | 5.0" | 10 | 6 | 33° – 44° |
| May | 63° | 33° | 2.2" | 0.8" | 11 | 1 | 42° – 53° |
| June | 73° | 38° | 1.7" | 0.2" | 8 | 0 | 50° – 61° |
| July | 82° | 43° | 0.9" | 0.0" | 7 | 0 | 54° – 68° |
| August | 81° | 42° | 1.1" | 0.0" | 6 | 0 | 57° – 65° |
| September | 71° | 34° | 1.4" | 0.2" | 7 | 0 | 49° – 57° |
| October | 57° | 26° | 1.6" | 3.7" | 9 | 2 | 32° – 47° |
| November | 41° | 17° | 1.4" | 11.4" | 10 | 11 | 20° – 36° |
| December | 29° | 7° | 1.6" | 17.5" | 13 | 29 | 14° – 24° |
| Year | 54° | 25° | 17.8" | 87.8" | 111 | 130 |
How much a month can swing
A normal is an average. November swings the most: from 1991 to 2020 its average ranged from 20° to 36°. September is the most reliable, staying within 7°.
Where Osmond’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 Osmond’s center.
- Snow: Afton, WY.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Afton, WY, 4 miles from the town’s center, at about the same height; 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 Osmond’s climate
What is the weather like in Osmond?
A typical July afternoon reaches 82°, a January night drops to 6°, and about 88 inches of snow falls in a normal winter. Colder January nights than 98% of U.S. towns; cooler July afternoons than 82% of U.S. towns.
How cold does it get in Osmond in winter?
January nights average 6°. About 227 nights a year reach 32° or below and 33 reach 0° or below. In the coldest January of the last 30 years the month averaged 11°.
How much snow does Osmond get?
About 88 inches in a normal winter at Afton, WY, most of it in January, with snow on the ground about 130 days a year.
How hot does it get in Osmond?
July, with a typical high of 82° and a low of 43°. About 5 days a year reach 90° (Afton, WY).
When is the first and last frost in Osmond?
In half of years the last spring frost (32°) comes by June 20 and the first fall frost by September 1, about 71 frost-free days, at Afton, WY.
What growing zone is Osmond 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 Osmond?
By one simple rule (highs of 62–84° and lows of 40° or more), July and August. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Osmond getting warmer?
Yes: 1991–2020 averaged 1.2° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 65% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Osmond.
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.