Few U.S. towns get less rain and snow than Little America: 8 inches a year
In July the day’s top temperature is typically 86°. A year here swings 78° from midwinter lows to midsummer highs. Winter nights are cold: in January they are colder than in 96% of U.S. towns. Homes need heating from October to April, the months averaging under 50°.
A year in Little America at a glance
Each month’s typical high and low, and what it brings.
What stands out about Little America’s climate
Compared with towns across the U.S., with Little America’s place in Wyoming beside it.
What a year in Little America feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 120 frost-free days a year
In half of years the last 32° night comes by May 24 and the first by September 22. Frost and day counts come from NOAA’s station at Green Rvr, WY, 22 miles from the town’s center, 250 ft lower.
The 2023 USDA map puts Little America’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 39 inches of snow a winter
Snow, measured at Green Rvr, WY, falls mostly in February. Precipitation (rain plus melted snow) adds up to 8 inches a year; May is the wettest month and January the driest. Rain or snow falls on about 71 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Little America
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 Green Rvr, WY.
Living with Little America’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
120 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 22.
Months with highs of 62–84° and lows of 40° or more: June and August. 6.5 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Little America from natural hazards, river flooding is the largest share (86%); heat waves, cold waves, winter storms and ice storms together are 6%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Little America and similar climates
TownRatings has no climate map of the towns around Little America yet.
Climates most like Little America’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 |
|---|---|---|---|---|
| Little America, WY | 8° | 86° | 8" | 39" |
| Salida, CO | 10° | 85° | 8" | 37" |
| Havre, MT | 6° | 85° | 13" | 41" |
| Taos, NM | 11° | 84° | 13" | 28" |
| Williston, ND | 2° | 84° | 15" | 48" |
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 Little America averaged 1.2° warmer than the 1900s. The biggest change is in March (+3.1°).
A smaller shift than in 63% 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 Little America compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Little America’s place among Wyoming’s.
Little America weather by month
Highs, lows and precipitation from NOAA’s grid at Little America’s center; snow, wet days and snow on the ground from Green Rvr, WY. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 31° | 8° | 0.3" | 6.3" | 5 | 19 | 11° – 28° |
| February | 35° | 11° | 0.3" | 7.6" | 5 | 17 | 10° – 31° |
| March | 46° | 21° | 0.5" | 5.4" | 6 | 7 | 25° – 38° |
| April | 55° | 27° | 0.8" | 3.9" | 7 | 2 | 34° – 46° |
| May | 66° | 36° | 1.3" | 0.9" | 9 | 0 | 45° – 55° |
| June | 77° | 44° | 0.8" | 0.0" | 5 | 0 | 54° – 65° |
| July | 86° | 50° | 0.6" | 0.0" | 5 | 0 | 59° – 73° |
| August | 83° | 48° | 0.8" | 0.0" | 5 | 0 | 61° – 69° |
| September | 74° | 39° | 0.9" | 0.3" | 6 | 0 | 52° – 61° |
| October | 59° | 29° | 0.8" | 2.4" | 6 | 1 | 35° – 50° |
| November | 43° | 18° | 0.4" | 5.0" | 5 | 7 | 19° – 37° |
| December | 32° | 8° | 0.3" | 6.7" | 6 | 19 | 13° – 29° |
| Year | 57° | 28° | 7.8" | 38.5" | 71 | 72 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 10° to 31°. August is the most reliable, staying within 8°.
Where Little America’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 Little America’s center.
- Snow: Green Rvr, WY.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Green Rvr, WY, 22 miles from the town’s center, 250 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 Little America’s climate
What is the weather like in Little America?
A typical July afternoon reaches 86°, a January night drops to 8°, and about 39 inches of snow falls in a normal winter. Colder January nights than 96% of U.S. towns; hotter July afternoons than 53% of U.S. towns.
How cold does it get in Little America in winter?
January nights average 8°. About 200 nights a year reach 32° or below and 24 reach 0° or below. In the coldest January of the last 30 years the month averaged 11°.
How much snow does Little America get?
About 39 inches in a normal winter at Green Rvr, WY, most of it in February, with snow on the ground about 72 days a year.
How hot does it get in Little America?
July, with a typical high of 86° and a low of 50°. About 30 days a year reach 90° (Green Rvr, WY).
When is the first and last frost in Little America?
In half of years the last spring frost (32°) comes by May 24 and the first fall frost by September 22, about 120 frost-free days, at Green Rvr, WY.
What growing zone is Little America 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 Little America?
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 Little America getting warmer?
Yes: 1991–2020 averaged 1.2° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 63% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Little America.
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.