Edgemont, South Dakota climate: Normal weather by month, frost dates and records
Edgemont's normal year runs from 4°F January nights to 89°F July afternoons, with 16.1 inches of precipitation and 36 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 6.9°C, January lows of −15°C, July highs of 32°C, 409 mm of precipitation a year.
- NOAA stationEdgemont
- Station IDUSC00392557
- Location43.31°N 103.82°W
- Elevation3,432 ft (1,046 m)
- From the center1 miles
- Population759
On October 22, the normal high in Edgemont is 59°F and the normal low 24°F, and the chance of measurable rain or snow is 20%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Edgemont.
- Jan 34° 4°
- Feb 38° 8°
- Mar 50° 18°
- Apr 59° 27°
- May 69° 38°
- Jun 80° 48°
- Jul 89° 55°
- Aug 87° 52°
- Sep 78° 42°
- Oct 62° 27°
- Nov 47° 15°
- Dec 35° 5°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Edgemont each month?
July is the warmest month, with normal highs of 89°F; January the coldest, with normal lows of 4°F. The most precipitation falls in May (2.65 in), the least in January (0.37 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 34°F | 4°F | 18.9°F | 0.37 | 5.0 | 5 | <1 | 31 | 9 h 20 min |
| February | 38°F | 8°F | 23.1°F | 0.48 | 5.6 | 5 | <1 | 27 | 10 h 30 min |
| March | 50°F | 18°F | 34.2°F | 0.95 | 6.4 | 6 | <1 | 27 | 11 h 50 min |
| April | 59°F | 27°F | 43.4°F | 1.84 | 4.6 | 9 | <1 | 16 | 13 h 20 min |
| May | 69°F | 38°F | 53.3°F | 2.65 | 1.0 | 11 | 1 | 5 | 14 h 40 min |
| June | 80°F | 48°F | 64.0°F | 2.64 | 0.0 | 10 | 6 | <1 | 15 h 20 min |
| July | 89°F | 55°F | 71.8°F | 2.21 | 0.0 | 8 | 16 | <1 | 15 h 10 min |
| August | 87°F | 52°F | 69.7°F | 1.50 | 0.0 | 7 | 15 | <1 | 14 h |
| September | 78°F | 42°F | 59.5°F | 1.21 | 0.1 | 6 | 6 | 2 | 12 h 30 min |
| October | 62°F | 27°F | 44.5°F | 1.26 | 2.7 | 7 | <1 | 16 | 11 h 10 min |
| November | 47°F | 15°F | 30.8°F | 0.56 | 4.7 | 5 | <1 | 28 | 9 h 40 min |
| December | 35°F | 5°F | 20.1°F | 0.44 | 6.1 | 4 | <1 | 31 | 9 h |
| Year (annual) | 61°F | 28°F | 44.4°F | 16.11 | 36.2 | 83 | 45 | 183 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 1°C | −15°C | −7.3°C | 9 mm | 13 cm |
| February | 4°C | −13°C | −4.9°C | 12 mm | 14 cm |
| March | 10°C | −8°C | 1.2°C | 24 mm | 16 cm |
| April | 15°C | −3°C | 6.3°C | 47 mm | 12 cm |
| May | 20°C | 3°C | 11.8°C | 67 mm | 3 cm |
| June | 27°C | 9°C | 17.8°C | 67 mm | 0 cm |
| July | 32°C | 13°C | 22.1°C | 56 mm | 0 cm |
| August | 31°C | 11°C | 20.9°C | 38 mm | 0 cm |
| September | 25°C | 5°C | 15.3°C | 31 mm | 0 cm |
| October | 17°C | −3°C | 6.9°C | 32 mm | 7 cm |
| November | 8°C | −10°C | −0.7°C | 14 mm | 12 cm |
| December | 2°C | −15°C | −6.6°C | 11 mm | 15 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00392557; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Edgemont?
Normal highs sit between 65°F and 85°F in May, June and September. Of those, September has the fewest days with rain (6).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00392557.
When is the last frost in Edgemont?
In Edgemont, the last spring frost (32°F) comes after May 23 in half of years and after June 7 in one year in ten; the first autumn frost comes before September 20 in half of years and before September 6 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- May 231 year in 10 after June 7; 9 in 10 after May 11
- First autumn frost, half of years before
- September 201 year in 10 before September 6; 9 in 10 before October 2
NOAA puts the median frost-free season at 117 days, and the season without a hard freeze (28°F) at 136 days.
A hard freeze (28°F) comes after May 13 in half of springs and before September 28 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Edgemont in zone 4b in ZIP code 57735, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Edgemont's NOAA station is in zone 4b: the coldest night of a typical year reaches −23°F (27 complete years).
Frost dates for every NOAA station in South Dakota · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00392557; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get in Edgemont?
In a normal year in Edgemont, 45 days a year reach 90°F (7 of them 100°F or more), 183 nights fall to 32°F or colder and 83 days bring measurable precipitation.
- Days at 90°F or more
- 45a normal year
- Days at 100°F or more
- 7a normal year
- Nights at 32°F or colder
- 183a normal year
- Days that stay below freezing
- 40high of 32°F or less
- Days with 0.01 inch of precipitation
- 83a normal year
- Days with 1 inch of snow or more
- 13a normal year
The highest temperature in this station's record (since 1979) is 111°F, on June 22, 2016; the lowest is −40°F, on December 22, 1989.
The wettest calendar year on that record is 1998, with 24.28 in; the snowiest season is 2019–20, with 59.7 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00392557; records: ACIS (NOAA Regional Climate Centers), station USC00392557. Records use complete months only; a month missing more than three days is left out.
How sunny is Edgemont?
Over a year 79% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Edgemont, 4.4 kWh per square metre a day. July is the sunniest month (86%) and April the cloudiest (72%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 78% | 2.1 |
| February | 75% | 3.0 |
| March | 74% | 4.1 |
| April | 72% | 5.1 |
| May | 73% | 6.0 |
| June | 82% | 7.0 |
| July | 86% | 7.1 |
| August | 86% | 6.1 |
| September | 83% | 4.8 |
| October | 77% | 3.3 |
| November | 77% | 2.3 |
| December | 75% | 1.8 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Edgemont need?
A normal year in Edgemont brings 7,990 heating degree days, 49% more than the median U.S. place (5,373), and 533 cooling degree days, 41% fewer than the median (908). Eight months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 2,308 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,428 | 0 |
| February | 1,173 | 0 |
| March | 956 | 0 |
| April | 650 | 0 |
| May | 372 | 9 |
| June | 107 | 77 |
| July | 16 | 227 |
| August | 32 | 177 |
| September | 205 | 41 |
| October | 635 | 1 |
| November | 1,025 | 0 |
| December | 1,392 | 0 |
| Year (annual) | 7,990 | 533 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00392557. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
Has Edgemont been warmer than normal lately?
2025 averaged 46.6°F, 2.2°F above the 1991-2020 normal of 44.4°F. 3 of the 4 complete years since 2022 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2022 | 44.1°F | −0.3°F | 12.31 | 28.5 |
| 2023 | 45.1°F | +0.7°F | 19.16 | 51.1 |
| 2024 | 47.3°F | +2.9°F | 10.95 | 19.5 |
| 2025 | 46.6°F | +2.2°F | 14.42 | 15.2 |
Over 38 complete years from 1980 to 2025, the station's annual mean temperature rose at a fitted 2.5°F per century (+0.14°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00392557; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Edgemont's climate compare?
Edgemont is warmer than 33 of the other 99 places with their own NOAA record in South Dakota, and wetter than 3. Across the 7,247 U.S. stations with normals, its annual mean of 44.4°F is warmer than 17%.
In the Köppen classification computed from these normals, Edgemont is BSk: cold semi-arid steppe. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Edgemont share this climate record?
2 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Dudley, SD9 people · 0 mi S
- Provo, SD0 people · 8 mi S
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
What do Edgemont's other NOAA stations record?
One more NOAA station keeps 1991-2020 normals in or near Edgemont. This page uses Edgemont; the other differs by site and elevation:
| Station | From the center | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| Edgemont (23 mi NNW) USC00392565 | 23 mi N | 4,402 ft | 45.5°F | 11°F | 85°F | 17.8 | 35 | May 18 |
Source: NOAA NCEI 1991-2020 normals for each station. Last frost: the median last spring date of 32°F.
Questions about Edgemont's climate
What is the coldest month in Edgemont?
January, with a normal high of 34°F and a normal low of 4°F. The warmest is July (89°F by day, 55°F at night).
Does it snow in Edgemont?
Yes: 36 inches in a normal year, falling on 20 days with 0.1 inch or more, the most in March (6.4 inches).
What is the rainiest month in Edgemont?
May, with 2.65 in of precipitation in a normal year; the driest is January with 0.37 in.
What plant hardiness zone is Edgemont in?
The USDA's 2023 map puts Edgemont in zone 4b in ZIP code 57735, the nearest ZIP area. By the same method at Edgemont's NOAA station, the coldest night of a typical year reaches −23°F (27 years, 1991-2020): zone 4b.
How late can frost come in Edgemont?
In half of years the last 32°F night comes after May 23; in one year in ten it comes after June 7. Waiting until June 7 leaves about a one-in-ten chance of a later frost.
Nearby and next
- South Dakota climateThe statewide normals and every place in the state
- Hot Springs, SD19 miles from this station, 48.6°F a year
- Ardmore, SD21 miles from this station, 47.5°F a year
- Redbird, WY24 miles from this station, 47.6°F a year
- Wind Cave, SD24 miles from this station, 47.2°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made