Green Valley, SD climate
Green Valley has cold, snowy winters and warm summers. A typical July afternoon reaches 85°, a January night drops to 6°, and about 36 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Green Valley feels like
Winter
Spring
Summer
Fall
Green Valley 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 | 30-yr range |
|---|---|---|---|---|---|---|
| January | 26° | 6° | 0.5" | 5.8" | 5 | 4° – 30° |
| February | 31° | 10° | 0.7" | 6.4" | 5 | 5° – 32° |
| March | 43° | 22° | 1.2" | 6.6" | 5 | 22° – 48° |
| April | 58° | 34° | 2.6" | 5.2" | 9 | 36° – 53° |
| May | 69° | 46° | 3.5" | 0 | 10 | 52° – 65° |
| June | 79° | 57° | 3.9" | 0 | 11 | 63° – 73° |
| July | 85° | 61° | 3.3" | 0 | 7 | 65° – 80° |
| August | 82° | 59° | 3.1" | 0 | 7 | 65° – 74° |
| September | 74° | 50° | 2.7" | 0 | 7 | 55° – 67° |
| October | 60° | 36° | 2.1" | 1.0" | 6 | 40° – 52° |
| November | 44° | 22° | 0.9" | 3.2" | 4 | 22° – 42° |
| December | 30° | 11° | 0.6" | 7.6" | 5 | 7° – 27° |
| Year | 57° | 35° | 25.1" | 35.8" | 80 |
“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 Green Valley
Green Valley gets 25 inches of rain and melted snow a year. June is the wettest month and January the driest. Rain or snow falls on about 80 days a year.
About 149 frost-free days a year
In half of years the last 32° night comes by May 5 and the first one by October 2. That leaves about 149 frost-free days for gardens, shorter than 82% of U.S. towns.
Heating and cooling a home in Green Valley
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Green Valley, 91% of that work is heating and 9% 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.
Green Valley and its neighbors
Green Valley borders 4 towns with climate data. January nights across them vary by 0.6°. Carthage has the coldest January nights (6°) and Miner the hottest July afternoons (85°). Green Valley’s January low is 6° and its July high 85°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Green Valley 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 Green Valley averaged 0.8° warmer than the 1900s. The biggest change is in January (+2.8°). The shift is smaller than in 84% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Green Valley’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 5° to 32°. August is the most reliable, staying within 9°.
Common questions about Green Valley’s climate
What is the coldest month in Green Valley?
January, with a typical high of 26° and a low of 6°.
What is the hottest month in Green Valley?
July, with a typical high of 85° and a low of 61°. About 14 days a year reach 90°.
How much snow does Green Valley get?
About 36 inches in a normal winter, most of it in December.
When is the first frost in Green Valley?
In half of years the first 32° night comes by October 2, and the last spring frost by May 5.
What is the rainiest month in Green Valley?
June, with 3.9 inches of rain and melted snow. The year totals 25 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Green Valley itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Howard, SD (8 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.