Blackhawk, SD climate
Blackhawk has cold, snowy winters and pleasant summers, with very little rain. A typical July afternoon reaches 83°, a January night drops to 14°, and about 36 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Blackhawk feels like
Winter
Spring
Summer
Fall
Blackhawk 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 | 38° | 14° | 0.3" | 3.9" | 3 | 5 | 17° – 36° |
| February | 38° | 15° | 0.5" | 6.1" | 4 | 7 | 11° – 36° |
| March | 47° | 24° | 1.1" | 6.2" | 4 | 4 | 23° – 47° |
| April | 55° | 31° | 2.2" | 7.9" | 7 | 2 | 36° – 49° |
| May | 64° | 41° | 4.1" | 0.9" | 9 | 0 | 46° – 58° |
| June | 75° | 50° | 3.3" | 0 | 10 | 0 | 57° – 69° |
| July | 83° | 57° | 2.8" | 0 | 9 | 0 | 62° – 76° |
| August | 82° | 55° | 2.0" | 0 | 6 | 0 | 64° – 73° |
| September | 73° | 46° | 1.5" | 0 | 5 | 0 | 53° – 66° |
| October | 59° | 34° | 1.6" | 2.1" | 5 | 1 | 38° – 52° |
| November | 47° | 24° | 0.5" | 4.0" | 3 | 3 | 26° – 44° |
| December | 38° | 16° | 0.4" | 5.0" | 2 | 6 | 18° – 33° |
| Year | 58° | 34° | 20.3" | 36.1" | 67 | 28 |
“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 Blackhawk
Blackhawk gets 20 inches of rain and melted snow a year. May is the wettest month and January the driest. Rain or snow falls on about 67 days a year. Snow covers the ground about 28 days of the year.
About 147 frost-free days a year
In half of years the last 32° night comes by May 10 and the first one by October 5. That leaves about 147 frost-free days for gardens, shorter than 83% of U.S. towns.
Heating and cooling a home in Blackhawk
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Blackhawk, 94% of that work is heating and 6% 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.
Blackhawk and its neighbors
Blackhawk borders 1 town with climate data. January nights across them vary by 0.2°. Summerset has both the coldest January nights (14°) and the hottest July afternoons (84°). Blackhawk’s January low is 14° and its July high 83°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Blackhawk 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 Blackhawk averaged 1.4° warmer than the 1900s. The biggest change is in January (+3.9°). The shift is larger than in 64% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Blackhawk’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. February swings the most: between 1991 and 2020 its average temperature ranged from 11° to 36°. August is the most reliable, staying within 10°.
Common questions about Blackhawk’s climate
What is the coldest month in Blackhawk?
January, with a typical high of 38° and a low of 14°.
What is the hottest month in Blackhawk?
July, with a typical high of 83° and a low of 57°. About 20 days a year reach 90°.
How much snow does Blackhawk get?
About 36 inches in a normal winter, most of it in April.
When is the first frost in Blackhawk?
In half of years the first 32° night comes by October 5, and the last spring frost by May 10.
What is the rainiest month in Blackhawk?
May, with 4.1 inches of rain and melted snow. The year totals 20 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Blackhawk itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Rapid City 4nw, SD (3 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.