Hoover, South Dakota climate: Climate normals at a NOAA weather station
Hoover's normal year runs from 5°F January nights to 88°F July afternoons, with 18.2 inches of precipitation and 48 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 6.6°C, January lows of −15°C, July highs of 31°C, 463 mm of precipitation a year.
- NOAA stationHoover
- Station IDUSC00393945
- Location45.11°N 103.27°W
- Elevation2,773 ft (845 m)
On October 23, the normal high in Hoover is 56°F and the normal low 25°F, and the chance of measurable rain or snow is 13%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Hoover.
- Jan 30° 5°
- Feb 34° 9°
- Mar 46° 18°
- Apr 57° 29°
- May 67° 39°
- Jun 79° 50°
- Jul 88° 56°
- Aug 87° 52°
- Sep 77° 42°
- Oct 60° 29°
- Nov 45° 16°
- Dec 33° 7°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like at Hoover each month?
July is the warmest month, with normal highs of 88°F; January the coldest, with normal lows of 5°F. The most precipitation falls in June (3.43 in), the least in January (0.32 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 30°F | 5°F | 17.7°F | 0.32 | 4.6 | 3 | <1 | 31 | 9 h 10 min |
| February | 34°F | 9°F | 21.3°F | 0.60 | 8.8 | 5 | <1 | 28 | 10 h 20 min |
| March | 46°F | 18°F | 31.7°F | 0.85 | 8.5 | 4 | <1 | 29 | 11 h 50 min |
| April | 57°F | 29°F | 43.1°F | 1.88 | 7.6 | 7 | <1 | 20 | 13 h 30 min |
| May | 67°F | 39°F | 52.9°F | 3.10 | 0.9 | 9 | 1 | 7 | 14 h 50 min |
| June | 79°F | 50°F | 64.1°F | 3.43 | 0.0 | 9 | 4 | <1 | 15 h 40 min |
| July | 88°F | 56°F | 71.6°F | 2.49 | 0.0 | 7 | 14 | <1 | 15 h 20 min |
| August | 87°F | 52°F | 69.4°F | 1.91 | 0.0 | 5 | 11 | <1 | 14 h 10 min |
| September | 77°F | 42°F | 59.4°F | 1.11 | 0.0 | 4 | 5 | 3 | 12 h 40 min |
| October | 60°F | 29°F | 44.5°F | 1.50 | 2.9 | 5 | <1 | 20 | 11 h |
| November | 45°F | 16°F | 30.5°F | 0.59 | 4.4 | 3 | <1 | 29 | 9 h 40 min |
| December | 33°F | 7°F | 20.1°F | 0.46 | 9.8 | 5 | <1 | 31 | 8 h 50 min |
| Year (annual) | 59°F | 29°F | 43.8°F | 18.24 | 47.5 | 67 | 34 | 197 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | −1°C | −15°C | −7.9°C | 8 mm | 12 cm |
| February | 1°C | −13°C | −5.9°C | 15 mm | 22 cm |
| March | 8°C | −8°C | −0.2°C | 22 mm | 22 cm |
| April | 14°C | −2°C | 6.2°C | 48 mm | 19 cm |
| May | 19°C | 4°C | 11.6°C | 79 mm | 2 cm |
| June | 26°C | 10°C | 17.8°C | 87 mm | 0 cm |
| July | 31°C | 13°C | 22.0°C | 63 mm | 0 cm |
| August | 30°C | 11°C | 20.8°C | 49 mm | 0 cm |
| September | 25°C | 6°C | 15.2°C | 28 mm | 0 cm |
| October | 16°C | −2°C | 6.9°C | 38 mm | 7 cm |
| November | 7°C | −9°C | −0.8°C | 15 mm | 11 cm |
| December | 1°C | −14°C | −6.6°C | 12 mm | 25 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00393945; 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.
Which months are mildest at Hoover?
Normal highs sit between 65°F and 85°F in May, June and September. Of those, September has the fewest days with rain (4).
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 USC00393945.
When is the last frost at Hoover?
In Hoover, the last spring frost (32°F) comes after May 19 in half of years and after May 31 in one year in ten; the first autumn frost comes before September 21 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 191 year in 10 after May 31; 9 in 10 after May 7
- First autumn frost, half of years before
- September 211 year in 10 before September 6; 9 in 10 before October 3
NOAA puts the median frost-free season at 122 days, and the season without a hard freeze (28°F) at 142 days.
A hard freeze (28°F) comes after May 9 in half of springs and before September 29 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Hoover in zone 4b in ZIP code 57760, the nearest ZIP area.
Frost dates for every NOAA station in South Dakota · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00393945; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. 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 at Hoover?
In a normal year in Hoover, 34 days a year reach 90°F (6 of them 100°F or more), 197 nights fall to 32°F or colder and 67 days bring measurable precipitation.
- Days at 90°F or more
- 34a normal year
- Days at 100°F or more
- 6a normal year
- Nights at 32°F or colder
- 197a normal year
- Days that stay below freezing
- 57high of 32°F or less
- Days with 0.01 inch of precipitation
- 67a normal year
- Days with 1 inch of snow or more
- 15a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00393945.
How sunny is it at Hoover?
Over a year 79% of the sunlight that would reach the ground under clear skies gets through the clouds at Hoover, 4.2 kWh per square metre a day. July is the sunniest month (87%) and April the cloudiest (73%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 77% | 1.9 |
| February | 79% | 2.9 |
| March | 74% | 3.9 |
| April | 73% | 5.0 |
| May | 74% | 6.0 |
| June | 80% | 6.8 |
| July | 87% | 7.0 |
| August | 86% | 6.0 |
| September | 82% | 4.5 |
| October | 75% | 3.0 |
| November | 75% | 2.0 |
| December | 73% | 1.5 |
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 many heating and cooling degree days does Hoover record?
A normal year at Hoover brings 8,191 heating degree days, 52% more than the median U.S. place (5,373), and 517 cooling degree days, 43% 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 2,277 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,468 | 0 |
| February | 1,225 | 0 |
| March | 1,033 | 0 |
| April | 659 | 1 |
| May | 384 | 9 |
| June | 100 | 73 |
| July | 17 | 223 |
| August | 36 | 174 |
| September | 204 | 36 |
| October | 637 | 2 |
| November | 1,035 | 0 |
| December | 1,393 | 0 |
| Year (annual) | 8,191 | 517 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00393945. 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.
How does Hoover's climate compare?
Hoover is warmer than 21 of the 100 places with their own NOAA record in South Dakota, and wetter than 18. Across the 7,247 U.S. stations with normals, its annual mean of 43.8°F is warmer than 15%.
In the Köppen classification computed from these normals, Hoover is Dwb: continental, dry-winter, warm summer. 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.
Questions about Hoover's climate
What is the coldest month at Hoover?
January, with a normal high of 30°F and a normal low of 5°F. The warmest is July (88°F by day, 56°F at night).
Does it snow at Hoover?
Yes: 48 inches in a normal year, falling on 20 days with 0.1 inch or more, the most in December (9.8 inches).
What is the rainiest month at Hoover?
June, with 3.43 in of precipitation in a normal year; the driest is January with 0.32 in.
What plant hardiness zone is Hoover in?
The USDA's 2023 map puts Hoover in zone 4b in ZIP code 57760, the nearest ZIP area.
How late can frost come at Hoover?
In half of years the last 32°F night comes after May 19; in one year in ten it comes after May 31. Waiting until May 31 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
- Zeona (10 mi SSW), SD14 miles from this station, 45.0°F a year
- Redig (11 mi NE), SD19 miles from this station, 45.1°F a year
- Newell, SD29 miles from this station, 45.7°F a year
- Antelope Ranger Station, SD29 miles from this station, 43.4°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made