Summit, SD climate
Summit has cold, snowy winters and pleasant summers. A typical July afternoon reaches 80°, a January night drops to 3°, and about 59 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Summit feels like
Winter
Spring
Summer
Fall
Summit weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 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 | 11 | 0 | 60° – 69° |
| July | 80° | 59° | 3.9" | 0 | 9 | 0 | 61° – 75° |
| August | 78° | 57° | 2.8" | 0 | 9 | 0 | 62° – 72° |
| September | 70° | 49° | 2.6" | 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 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Summit
Summit gets 26 inches of rain and melted snow a year. June is the wettest month and January the driest. Rain or snow falls on about 93 days a year. Snow covers the ground about 107 days of the year.
About 136 frost-free days a year
In half of years the last 32° night comes by May 14 and the first one by September 28. That leaves about 136 frost-free days for gardens, shorter than 92% of U.S. towns.
Heating and cooling a home in Summit
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Summit, 95% of that work is heating and 5% is cooling, so the furnace matters far more than the air conditioner.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
Summit and its neighbors
Summit borders 1 town with climate data. January nights across them vary by 0.0°. Summit has both the coldest January nights (3°) and the hottest July afternoons (80°). Summit’s January low is 3° and its July high 80°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Summit compares
Compared with every U.S. town and city on TownTapestry, each counted once.
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°). The shift is smaller than in 62% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Summit’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. January swings the most: between 1991 and 2020 its average temperature ranged from -3° to 24°. August is the most reliable, staying within 9°.
Common questions about Summit’s climate
What is the coldest month in Summit?
January, with a typical high of 19° and a low of 3°.
What is the hottest month in Summit?
July, with a typical high of 80° and a low of 59°. About 7 days a year reach 90°.
How much snow does Summit get?
About 59 inches in a normal winter, most of it in February.
When is the first frost in Summit?
In half of years the first 32° night comes by September 28, and the last spring frost by May 14.
What is the rainiest month in Summit?
June, with 3.9 inches of rain and melted snow. The year totals 26 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Summit itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Summit 1 W, SD (1 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.