Precipitation in South Hills trails that of 94% of U.S. towns: 14 inches a year
Nights in January average 16°. The seasons are far apart: from a winter night to a summer afternoon the average spans 68°. Winter nights are cold: in January they are colder than in 83% of U.S. towns. Central heating does most of its work from October to April, in months below 50° on average.
A year in South Hills at a glance
Each month’s typical high and low, and what it brings.
What stands out about South Hills’ climate
Compared with towns across the U.S., with South Hills’ place in Montana beside it.
What a year in South Hills feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 81 frost-free days a year
In half of years the last 32° night comes by June 18 and the first by September 5. Frost and day counts come from NOAA’s station at Tizer Gardens, MT, 13 miles from the town’s center, at about the same height.
The 2023 USDA map puts South Hills’ center in zone 5a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −20°. 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 37 inches of snow a winter
Snow, measured at Helena Rgnl Airport, falls mostly in December. Precipitation (rain plus melted snow) adds up to 14 inches a year; June is the wettest month and January the driest. Rain or snow falls on about 91 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in South Hills
99% 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 Tizer Gardens, MT.
Living with South Hills’ climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
81 frost-free days in zone 5a. The last frost comes by Jun 18 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 5.
Months with highs of 62–84° and lows of 40° or more: June, July, August and September. 11 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in South Hills from natural hazards, river flooding is the largest share (30%); heat waves, cold waves, winter storms and ice storms together are 33%. Normals are averages; the hazards page covers the extremes.
Natural hazards →South Hills and similar climates
TownRatings has no climate map of the towns around South Hills yet.
Climates most like South Hills’, 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 Hills, MT | 16° | 83° | 14" | 37" |
| Cody, WY | 14° | 85° | 11" | 45" |
| Cimarron Hills, CO | 18° | 85° | 17" | 33" |
| Raton, NM | 15° | 85° | 16" | 25" |
| Doney Park, AZ | 17° | 86° | 16" | 52" |
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 South Hills averaged 1.3° warmer than the 1900s. The biggest change is in January (+4.3°).
A smaller shift than in 56% 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 Hills compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with South Hills’ place among Montana’s.
South Hills weather by month
Highs, lows and precipitation from NOAA’s grid at South Hills’ center; snow, wet days and snow on the ground from Helena Rgnl Airport. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 33° | 16° | 0.4" | 6.6" | 7 | 18 | 15° – 33° |
| February | 36° | 17° | 0.5" | 6.6" | 7 | 11 | 10° – 37° |
| March | 47° | 24° | 0.8" | 4.6" | 7 | 5 | 25° – 43° |
| April | 55° | 31° | 1.5" | 2.9" | 9 | 1 | 38° – 48° |
| May | 64° | 39° | 2.4" | 0.1" | 11 | 0 | 46° – 56° |
| June | 73° | 46° | 2.7" | 0.0" | 12 | 0 | 54° – 67° |
| July | 83° | 52° | 1.3" | 0.0" | 8 | 0 | 58° – 74° |
| August | 82° | 50° | 1.2" | 0.3" | 6 | 0 | 60° – 70° |
| September | 72° | 42° | 1.3" | 0.2" | 6 | 0 | 53° – 61° |
| October | 57° | 33° | 1.1" | 2.8" | 7 | 2 | 37° – 51° |
| November | 42° | 24° | 0.7" | 5.4" | 7 | 6 | 24° – 41° |
| December | 33° | 16° | 0.5" | 7.7" | 7 | 14 | 14° – 31° |
| Year | 56° | 32° | 14.3" | 37.2" | 91 | 57 |
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 37°. September is the most reliable, staying within 9°.
Where South Hills’ 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 Hills’ center.
- Snow: Helena Rgnl Airport.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Tizer Gardens, MT, 13 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 South Hills’ climate
What is the weather like in South Hills?
A typical July afternoon reaches 83°, a January night drops to 16°, and about 37 inches of snow falls in a normal winter. Colder January nights than 83% of U.S. towns; cooler July afternoons than 66% of U.S. towns.
How cold does it get in South Hills in winter?
January nights average 16°. About 223 nights a year reach 32° or below and 27 reach 0° or below. In the coldest January of the last 30 years the month averaged 15°.
How much snow does South Hills get?
About 37 inches in a normal winter at Helena Rgnl Airport, most of it in December, with snow on the ground about 57 days a year.
How hot does it get in South Hills?
July, with a typical high of 83° and a low of 52°. About 11 days a year reach 90° (Tizer Gardens, MT).
When is the first and last frost in South Hills?
In half of years the last spring frost (32°) comes by June 18 and the first fall frost by September 5, about 81 frost-free days, at Tizer Gardens, MT.
What growing zone is South Hills in?
Zone 5a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −20°.
What is the best time of year to visit South Hills?
By one simple rule (highs of 62–84° and lows of 40° or more), June, July, August and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is South Hills getting warmer?
Yes: 1991–2020 averaged 1.3° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 56% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in South Hills.
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.