Precipitation in Parkman trails that of 92% of U.S. towns: 17 inches a year
On a normal January night the air cools to about 13°. Winter nights are cold: in January they are colder than in 90% of U.S. towns. Warming shows here too: 1.6° more than in 1901–2000, led by January. Plan time outside for June and September, when highs sit at 73–75°.
A year in Parkman at a glance
Each month’s typical high and low, and what it brings.
What stands out about Parkman’s climate
Compared with towns across the U.S., with Parkman’s place in Wyoming beside it.
What a year in Parkman feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 114 frost-free days a year
In half of years the last 32° night comes by May 24 and the first by September 18. Frost and day counts come from NOAA’s station at Dayton, WY, 6 miles from the town’s center, 380 ft lower.
The 2023 USDA map puts Parkman’s center in zone 5a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −18°. 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 68 inches of snow a winter
Snow, measured at Dayton, WY, falls mostly in January, February, March and December. Precipitation (rain plus melted snow) adds up to 17 inches a year; May is the wettest month and February the driest. Rain or snow falls on about 94 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Parkman
96% 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 Dayton, WY.
Living with Parkman’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
114 frost-free days in zone 5a. 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 18.
Months with highs of 62–84° and lows of 40° or more: June and September. 4.9 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Parkman from natural hazards, river flooding is the largest share (62%); heat waves, cold waves, winter storms and ice storms together are 12%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Parkman and similar climates
TownRatings has no climate map of the towns around Parkman yet.
Climates most like Parkman’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 |
|---|---|---|---|---|
| Parkman, WY | 13° | 86° | 17" | 68" |
| Durango, CO | 12° | 86° | 18" | 64" |
| Great Falls, MT | 13° | 84° | 13" | 66" |
| Rexburg, ID | 12° | 84° | 13" | 70" |
| Rapid Valley, SD | 14° | 86° | 19" | 49" |
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 Parkman averaged 1.6° warmer than the 1900s. The biggest change is in January (+4.4°).
A bigger shift than in 64% 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 Parkman compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Parkman’s place among Wyoming’s.
Parkman weather by month
Highs, lows and precipitation from NOAA’s grid at Parkman’s center; snow, wet days and snow on the ground from Dayton, WY. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 36° | 13° | 0.7" | 10.8" | 7 | 22 | 17° – 31° |
| February | 37° | 15° | 0.7" | 11.1" | 7 | 18 | 18° – 34° |
| March | 48° | 23° | 1.1" | 12.0" | 8 | 12 | 27° – 43° |
| April | 55° | 31° | 2.1" | 7.1" | 10 | 4 | 37° – 48° |
| May | 65° | 40° | 3.2" | 1.4" | 11 | 0 | 48° – 57° |
| June | 75° | 48° | 2.2" | 0.0" | 10 | 0 | 55° – 67° |
| July | 86° | 54° | 1.3" | 0.0" | 7 | 0 | 61° – 75° |
| August | 84° | 52° | 0.8" | 0.0" | 6 | 0 | 63° – 72° |
| September | 73° | 43° | 1.6" | 0.3" | 7 | 0 | 53° – 63° |
| October | 58° | 32° | 1.8" | 6.4" | 9 | 3 | 36° – 52° |
| November | 45° | 21° | 0.9" | 7.5" | 7 | 10 | 23° – 42° |
| December | 36° | 13° | 0.7" | 11.7" | 7 | 18 | 17° – 30° |
| Year | 58° | 32° | 16.9" | 68.3" | 94 | 88 |
How much a month can swing
A normal is an average. November swings the most: from 1991 to 2020 its average ranged from 23° to 42°. May is the most reliable, staying within 10°.
Where Parkman’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 Parkman’s center.
- Snow: Dayton, WY.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Dayton, WY, 6 miles from the town’s center, 380 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 Parkman’s climate
What is the weather like in Parkman?
A typical July afternoon reaches 86°, a January night drops to 13°, and about 68 inches of snow falls in a normal winter. Colder January nights than 90% of U.S. towns; hotter July afternoons than 53% of U.S. towns.
How cold does it get in Parkman in winter?
January nights average 13°. About 197 nights a year reach 32° or below and 26 reach 0° or below. In the coldest January of the last 30 years the month averaged 17°.
How much snow does Parkman get?
About 68 inches in a normal winter at Dayton, WY, most of it in January, February, March and December, with snow on the ground about 88 days a year.
How hot does it get in Parkman?
July, with a typical high of 86° and a low of 54°. About 24 days a year reach 90° (Dayton, WY).
When is the first and last frost in Parkman?
In half of years the last spring frost (32°) comes by May 24 and the first fall frost by September 18, about 114 frost-free days, at Dayton, WY.
What growing zone is Parkman in?
Zone 5a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −18°.
What is the best time of year to visit Parkman?
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 Parkman getting warmer?
Yes: 1991–2020 averaged 1.6° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 64% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Parkman.
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.