Photo: LikeGrantTookRichmond · CC BY-SA 3.0South Park sits near the bottom of U.S. towns for winter warmth
Peak summer warmth arrives in July, with afternoons near 81°. The year swings widely: the coldest month’s nights and the warmest month’s afternoons are 75° apart. By precipitation alone, it ranks drier than 92% of U.S. towns. If you like long walks, July and August offer highs of 80–81°.
A year in South Park at a glance
Each month’s typical high and low, and what it brings.
What stands out about South Park’s climate
Compared with towns across the U.S., with South Park’s place in Wyoming beside it.
What a year in South Park feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
A freeze is possible in every month
About 236 nights a year fall to 32° or below, and 35 to 0° or below. Frost and day counts come from NOAA’s station at Jackson, WY, 5 miles from the town’s center, 150 ft higher.
The 2023 USDA map puts South Park’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 78 inches of snow a winter
Snow, measured at Jackson, WY, falls mostly in January. Precipitation (rain plus melted snow) adds up to 17 inches a year; May is the wettest month and July the driest. Rain or snow falls on about 116 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in South Park
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 Jackson, WY.
Living with South Park’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
Zone 4b, and frost can come in any month. The longest frost-free stretch in half of years is about 46 days.
Months with highs of 62–84° and lows of 40° or more: July and August. 16 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in South Park from natural hazards, avalanches are the largest share (89%). Normals are averages; the hazards page covers the extremes.
Natural hazards →South Park and its neighbors
Every town next door is within a degree of South Park in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like South Park’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 |
|---|---|---|---|---|
| South Park, WY | 6° | 81° | 17" | 78" |
| Minot, ND | 2° | 82° | 17" | 52" |
| Lewistown, MT | 12° | 82° | 18" | 112" |
| Gunnison, CO | 0° | 82° | 12" | 50" |
| Hailey, ID | 10° | 84° | 14" | 102" |
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
Warmer than it used to be
The last 30 years in South Park averaged 1.0° warmer than the 1900s. The biggest change is in March (+3.2°).
A smaller shift than in 80% 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 South Park compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with South Park’s place among Wyoming’s.
South Park weather by month
Highs, lows and precipitation from NOAA’s grid at South Park’s center; snow, wet days and snow on the ground from Jackson, WY. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | 30-yr range |
|---|---|---|---|---|---|---|
| January | 27° | 6° | 1.5" | 19.1" | 12 | 9° – 25° |
| February | 32° | 8° | 1.3" | 15.6" | 10 | 14° – 27° |
| March | 42° | 18° | 1.2" | 9.2" | 9 | 24° – 35° |
| April | 51° | 25° | 1.4" | 4.2" | 9 | 33° – 42° |
| May | 62° | 33° | 1.8" | 0.6" | 11 | 42° – 52° |
| June | 72° | 39° | 1.5" | 0.0" | 10 | 50° – 61° |
| July | 81° | 44° | 1.0" | 0.0" | 7 | 54° – 68° |
| August | 80° | 42° | 1.1" | 0.0" | 8 | 57° – 64° |
| September | 70° | 35° | 1.4" | 0.1" | 8 | 50° – 56° |
| October | 56° | 26° | 1.4" | 2.0" | 9 | 33° – 46° |
| November | 40° | 17° | 1.4" | 11.0" | 10 | 21° – 35° |
| December | 28° | 7° | 1.7" | 16.4" | 14 | 13° – 22° |
| Year | 53° | 25° | 16.7" | 78.2" | 116 |
How much a month can swing
A normal is an average. January swings the most: from 1991 to 2020 its average ranged from 9° to 25°. September is the most reliable, staying within 7°.
Where South Park’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 South Park’s center.
- Snow: Jackson, WY.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Jackson, WY, 5 miles from the town’s center, 150 ft higher; 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 South Park’s climate
What is the weather like in South Park?
A typical July afternoon reaches 81°, a January night drops to 6°, and about 78 inches of snow falls in a normal winter. Colder January nights than 98% of U.S. towns; cooler July afternoons than 89% of U.S. towns.
How cold does it get in South Park in winter?
January nights average 6°. About 236 nights a year reach 32° or below and 35 reach 0° or below. In the coldest January of the last 30 years the month averaged 9°.
How much snow does South Park get?
About 78 inches in a normal winter at Jackson, WY, most of it in January.
How hot does it get in South Park?
July, with a typical high of 81° and a low of 44°. About 5 days a year reach 90° (Jackson, WY).
When is the first and last frost in South Park?
There is no reliable frost-free season: at Jackson, WY, every month has nights at 32° or below, about 236 a year. In half of years the longest stretch without a freeze is about 46 days.
What growing zone is South Park 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 South Park?
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 South Park getting warmer?
Yes: 1991–2020 averaged 1.0° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 80% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in South Park.
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.