Few U.S. towns have colder winter nights than Summit
In July the day’s top temperature is typically 80°. Summers stay cool: July afternoons here are cooler than in 92% of U.S. towns. Since 1901–2000, the year has warmed by 1.1°, most of all in January. Garden planting can start around May 14; autumn frost returns near September 28.
A year in Summit at a glance
Each month’s typical high and low, and what it brings.
What stands out about Summit’s climate
Compared with towns across the U.S., with Summit’s place in South Dakota beside it.
What a year in Summit feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 136 frost-free days a year
In half of years the last 32° night comes by May 14 and the first by September 28. Frost and day counts come from NOAA’s station at Summit 1 W, SD, 1.1 miles from the town’s center, at about the same height.
The 2023 USDA map puts Summit’s center in zone 4a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −27°. 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 59 inches of snow a winter
Snow, measured at Summit 1 W, SD, falls mostly in February and December. Precipitation (rain plus melted snow) adds up to 26 inches a year; June is the wettest month and January the driest. Rain or snow falls on about 93 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Summit
95% 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 Summit 1 W, SD.
Living with Summit’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
136 frost-free days in zone 4a. The last frost comes by May 14 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: May, June, July, August and September. 0.0 miles of trails are waiting.
Parks & trails →Cold waves are 37% of the yearly building losses FEMA expects in Summit from natural hazards, the largest share. Normals are averages; the hazards page covers the extremes.
Natural hazards →Summit and its neighbors
Every town next door is within a degree of Summit in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Summit’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 |
|---|---|---|---|---|
| Summit, SD | 3° | 80° | 26" | 59" |
| Kingsford, MI | 5° | 80° | 29" | 61" |
| Baxter, MN | 1° | 80° | 29" | 48" |
| Antigo, WI | 5° | 79° | 32" | 54" |
| Grand Forks, ND | −2° | 81° | 22" | 49" |
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 Summit averaged 1.1° warmer than the 1900s. The biggest change is in January (+2.7°).
A smaller shift than in 71% 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 Summit compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Summit’s place among South Dakota’s.
Summit weather by month
Highs, lows and precipitation from NOAA’s grid at Summit’s center; snow, wet days and snow on the ground from Summit 1 W, SD. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 19° | 3° | 0.7" | 10.2" | 6 | 28 | −3° – 24° |
| February | 24° | 7° | 0.7" | 12.4" | 6 | 24 | 2° – 27° |
| March | 37° | 19° | 1.2" | 8.8" | 6 | 18 | 18° – 43° |
| April | 52° | 31° | 2.3" | 7.8" | 8 | 6 | 31° – 50° |
| May | 66° | 44° | 3.2" | 0.1" | 11 | 0 | 50° – 62° |
| June | 75° | 55° | 3.9" | 0.0" | 11 | 0 | 60° – 69° |
| July | 80° | 59° | 3.9" | 0.0" | 9 | 0 | 61° – 75° |
| August | 78° | 57° | 2.8" | 0.0" | 9 | 0 | 62° – 72° |
| September | 70° | 49° | 2.6" | 0.0" | 8 | 0 | 53° – 64° |
| October | 55° | 35° | 2.5" | 2.0" | 8 | 1 | 37° – 50° |
| November | 38° | 22° | 0.9" | 5.4" | 5 | 8 | 18° – 41° |
| December | 24° | 9° | 0.8" | 11.9" | 7 | 23 | 2° – 25° |
| Year | 51° | 32° | 25.6" | 58.6" | 93 | 107 |
How much a month can swing
A normal is an average. January swings the most: from 1991 to 2020 its average ranged from -3° to 24°. August is the most reliable, staying within 9°.
Where Summit’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 Summit’s center.
- Snow: Summit 1 W, SD (NOAA station in town).
- Frost, freezing nights, 90° and 100° days, heating and cooling: Summit 1 W, SD, 1.1 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 Summit’s climate
What is the weather like in Summit?
A typical July afternoon reaches 80°, a January night drops to 3°, and about 59 inches of snow falls in a normal winter. Colder January nights than all but 127 U.S. towns; cooler July afternoons than 92% of U.S. towns.
How cold does it get in Summit in winter?
January nights average 3°. About 180 nights a year reach 32° or below and 39 reach 0° or below. In the coldest January of the last 30 years the month averaged −3°.
How much snow does Summit get?
About 59 inches in a normal winter at Summit 1 W, SD, most of it in February and December, with snow on the ground about 107 days a year.
How hot does it get in Summit?
July, with a typical high of 80° and a low of 59°. About 7 days a year reach 90° (Summit 1 W, SD).
When is the first and last frost in Summit?
In half of years the last spring frost (32°) comes by May 14 and the first fall frost by September 28, about 136 frost-free days, at Summit 1 W, SD.
What growing zone is Summit in?
Zone 4a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −27°.
What is the best time of year to visit Summit?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, July, August and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Summit getting warmer?
Yes: 1991–2020 averaged 1.1° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 71% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Summit.
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.