Arrowhead Springs is among the driest of U.S. towns: 9 inches of precipitation a year
On a normal January night the air cools to about 11°. Seasons differ by 75°, from the coldest nights to the warmest afternoons. Its January nights bite harder than in 92% of U.S. towns. Seedlings are safe outdoors from about May 22, with the first autumn frost due around September 28.
A year in Arrowhead Springs at a glance
Each month’s typical high and low, and what it brings.
What stands out about Arrowhead Springs’ climate
Compared with towns across the U.S., with Arrowhead Springs’ place in Wyoming beside it.
What a year in Arrowhead Springs feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 126 frost-free days a year
In half of years the last 32° night comes by May 22 and the first by September 28. Frost and day counts come from NOAA’s station at Rock Springs Airport, 8 miles from the town’s center, at about the same height.
The 2023 USDA map puts Arrowhead Springs’ center in zone 5b: the coldest night of a typical winter, averaged over 1991–2020, reaches about −13°. 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 31 inches of snow a winter
Snow, measured at Rock Springs Fire Dept, WY, falls mostly in January and December. Precipitation (rain plus melted snow) adds up to 9 inches a year; May is the wettest month and January the driest. Rain or snow falls on about 62 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Arrowhead Springs
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 Rock Springs Airport.
Living with Arrowhead Springs’ climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
126 frost-free days in zone 5b. The last frost comes by May 22 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 28.
Months with highs of 62–84° and lows of 40° or more: June, August and September. 0.5 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Arrowhead Springs from natural hazards, river flooding is the largest share (63%); heat waves, cold waves, winter storms and ice storms together are 8%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Arrowhead Springs and similar climates
TownRatings has no climate map of the towns around Arrowhead Springs yet.
Climates most like Arrowhead Springs’, 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 |
|---|---|---|---|---|
| Arrowhead Springs, WY | 11° | 86° | 9" | 31" |
| Salida, CO | 10° | 85° | 8" | 37" |
| Helena Valley West Central, MT | 15° | 85° | 11" | 37" |
| Taos, NM | 11° | 84° | 13" | 28" |
| 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 Arrowhead Springs averaged 1.5° warmer than the 1900s. The biggest change is in March (+3.6°).
A bigger shift than in 57% 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 Arrowhead Springs compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Arrowhead Springs’ place among Wyoming’s.
Arrowhead Springs weather by month
Highs, lows and precipitation from NOAA’s grid at Arrowhead Springs’ center; snow, wet days and snow on the ground from Rock Springs Fire Dept, WY. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 32° | 11° | 0.5" | 6.1" | 4 | 14 | 13° – 31° |
| February | 36° | 14° | 0.5" | 5.8" | 5 | 8 | 13° – 32° |
| March | 46° | 23° | 0.6" | 4.4" | 4 | 3 | 26° – 40° |
| April | 55° | 29° | 1.1" | 1.9" | 6 | 1 | 36° – 48° |
| May | 65° | 37° | 1.4" | 0.5" | 9 | 0 | 45° – 56° |
| June | 77° | 45° | 0.8" | 0.0" | 5 | 0 | 54° – 66° |
| July | 86° | 53° | 0.6" | 0.0" | 4 | 0 | 61° – 74° |
| August | 83° | 51° | 0.8" | 0.0" | 5 | 0 | 63° – 71° |
| September | 73° | 41° | 1.0" | 0.0" | 6 | 0 | 53° – 61° |
| October | 58° | 31° | 1.1" | 2.3" | 5 | 1 | 36° – 51° |
| November | 43° | 20° | 0.5" | 3.8" | 4 | 4 | 21° – 39° |
| December | 32° | 12° | 0.5" | 6.5" | 6 | 13 | 16° – 29° |
| Year | 57° | 30° | 9.4" | 31.3" | 62 | 44 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 13° to 32°. September is the most reliable, staying within 8°.
Where Arrowhead Springs’ 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 Arrowhead Springs’ center.
- Snow: Rock Springs Fire Dept, WY.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Rock Springs Airport, 8 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 Arrowhead Springs’ climate
What is the weather like in Arrowhead Springs?
A typical July afternoon reaches 86°, a January night drops to 11°, and about 31 inches of snow falls in a normal winter. Colder January nights than 92% of U.S. towns; hotter July afternoons than 55% of U.S. towns.
How cold does it get in Arrowhead Springs in winter?
January nights average 11°. About 189 nights a year reach 32° or below and 11 reach 0° or below. In the coldest January of the last 30 years the month averaged 13°.
How much snow does Arrowhead Springs get?
About 31 inches in a normal winter at Rock Springs Fire Dept, WY, most of it in January and December, with snow on the ground about 44 days a year.
How hot does it get in Arrowhead Springs?
July, with a typical high of 86° and a low of 53°. About 10 days a year reach 90° (Rock Springs Airport).
When is the first and last frost in Arrowhead Springs?
In half of years the last spring frost (32°) comes by May 22 and the first fall frost by September 28, about 126 frost-free days, at Rock Springs Airport.
What growing zone is Arrowhead Springs in?
Zone 5b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −13°.
What is the best time of year to visit Arrowhead Springs?
By one simple rule (highs of 62–84° and lows of 40° or more), June, August and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Arrowhead Springs getting warmer?
Yes: 1991–2020 averaged 1.5° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 57% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Arrowhead Springs.
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.