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Weather & Climate in Gregory, SD

Temperature, precipitation, air quality, natural hazards, and monthly weather data.

Gregory experiences four distinct seasons with an average annual temperature of 47°F (9°C). Winters average 21°F in January while summers reach 74°F in July. The area gets 291 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 26.7 inches (drier than the 38-inch national average). The area receives 45.0 inches of snow annually, making winter weather a significant factor for residents. Air quality is rated Good with a median AQI of 35. The city sits at an elevation of 2,168 feet.

Temperature

21°F Jan (-6°C) 74°F Jul (23°C)
Annual Average47.3°F
12% below US avg
January Average21°F (-6°C)
July Average74°F (23°C)
Sunny Days291 days/yr

Geography

Elevation2,168 ft (661 m)
Area1.7 sq mi (4.4 km²)
Population Density773/sq mi
Coordinates43.2300°N, 99.4209°W
TimezoneAmerica/Chicago
CountyGregory County County
Nearest AirportAinsworth Regional (ANW)
53 miles away

Precipitation & Snow

Annual Rainfall 26.7"
30% below US avg
Snowfall 45.0"
Wettest Month (Jun) 3.62"
Driest Month (Jan) 0.51"

Air Quality

AQI Median35.0
RatingGood

Natural Hazard Risk

Overall RiskVery Low
Risk Score16.2 / 100
Social Vulnerability18.9 / 100
Community Resilience78.3 / 100

Hazard Breakdown

Tornado Relatively Low
Earthquake Very Low
Wildfire Relatively Low
Flood Very Low
Hail Relatively Low
Strong Wind Very Low
Heat Wave Very Low
Winter Weather Relatively Moderate
Lightning Very Low
Ice Storm Relatively Low
Drought Relatively Low
Cold Wave Relatively Moderate
Landslide Very Low
Source: FEMA National Risk Index v1.20 (Dec 2025)

Earthquake History

21 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.3.

Nov 3, 2002 16 km SSW of Butte, Nebraska M4.3 67 km 5 km
Jun 4, 2021 10 km NE of Anoka, Nebraska M3.7 61 km 5 km
Oct 25, 1990 8 km N of Plankinton, South Dakota M3.6 99 km 5 km
Aug 26, 1991 15 km SSE of Brownlee, Nebraska M3.4 150 km 5 km
Jun 18, 2015 15 km SSE of Valentine, Nebraska M3.3 101 km 5 km
Aug 9, 2011 2 km S of Fort Pierre, South Dakota M3.3 145 km 5 km
Jan 25, 1994 8 km E of Wood Lake, Nebraska M3.3 89 km 5 km
Apr 11, 2016 11 km E of Brownlee, Nebraska M3.2 135 km 5 km
Aug 5, 2022 4 km ENE of Draper, South Dakota M3.2 116 km 9 km
Jan 4, 2021 5 km N of Tyndall, South Dakota M3.1 128 km 5 km
Jul 12, 1998 7 km E of Corn Creek, South Dakota M3.1 141 km 5 km
Jun 4, 2021 9 km ENE of Anoka, Nebraska M3.1 62 km 5 km
Jan 1, 2025 4 km S of Brownlee, Nebraska M3.0 147 km 5 km
Feb 7, 2014 11 km NE of Bijou Hills, South Dakota M3.0 50 km 5 km
Feb 1, 2006 6 km ENE of Bassett, Nebraska M2.9 69 km 5 km
Jan 1, 2020 2 km E of Chambers, Nebraska M2.8 127 km 10 km
Jul 3, 1995 9 km SSW of Fort Thompson, South Dakota M2.8 86 km 5 km
Mar 20, 2010 9 km NNW of Springview, Nebraska M2.7 48 km 5 km
Apr 27, 2025 9 km NE of Burke, South Dakota M2.5 16 km 5 km
Jan 16, 2022 9 km NE of Plankinton, South Dakota M2.5 102 km 5 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

321 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 1 fatality, 58 injuries.

Date Rating Distance Path Fatalities
May 8, 1965 EF5 35 km 30.1 mi 0
May 29, 1962 EF4 100 km 24.2 mi 0
Aug 11, 2011 EF3 98 km 0.5 mi 0
May 5, 2007 EF3 95 km 4.0 mi 0
Jun 9, 2003 EF3 93 km 23.0 mi 0
Jun 16, 1992 EF3 91 km 2.0 mi 0
Jul 24, 1971 EF3 61 km 2.5 mi 0
Jul 9, 1971 EF3 96 km 0.1 mi 0
Jul 9, 1971 EF3 74 km 0.1 mi 0
May 8, 1965 EF3 10 km 1.5 mi 0
May 21, 1962 EF3 70 km 11.0 mi 0
May 16, 1962 EF3 42 km 0.1 mi 0
May 15, 1962 EF3 4 km 0.1 mi 0
May 14, 1962 EF3 56 km 53.8 mi 0
May 14, 1962 EF3 86 km 70.4 mi 0
May 22, 2016 EF2 85 km 4.6 mi 0
May 10, 2015 EF2 98 km 16.2 mi 0
Jun 18, 2014 EF2 99 km 1.1 mi 0
May 22, 2010 EF2 40 km 2.9 mi 0
May 22, 2010 EF2 51 km 9.0 mi 0
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).

Wildfire History

16 wildfires (100+ acres) recorded within 100 km. Largest: REGION 24 COMPLEX (66,349 acres, 2012).

Year Name Acres Burned Distance
2012 REGION 24 COMPLEX 66,349 73 km
2011 OKREEK 11,115 79 km
2012 UNNAMED 6,910 53 km
1998 TNC 4,683 78 km
2023 NENFR-HFR-FY23-RX-UNITS 35-36-39 2,936 91 km
2012 UNNAMED 2,875 47 km
2024 UNIT 16 RX 2,171 90 km
2000 NOVOTNY AND WAGNER 1,968 38 km
2012 KAYLKOWSKI 1,966 88 km
2011 HIGHWAY 47 1,800 87 km
1988 SIMMONS I 1,764 83 km
2006 VALENTINE 1,721 98 km
2005 CHAOS 1,539 98 km
2014 OKREEK 1,273 78 km
2000 BAD HORSE 1,215 97 km
2023 SDLDR-HFR-FY23-RX-BROKEN ARROW UNITS B-C-D-E-G-H-I 1,185 64 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 21°F (-6°C) 0.5 in Coldest, Driest
February 26°F (-4°C) 0.6 in
March 35°F (2°C) 1.7 in
April 47°F (8°C) 2.7 in
May 58°F (15°C) 3.5 in
June 68°F (20°C) 3.6 in Wettest
July 74°F (23°C) 3.2 in Warmest
August 73°F (23°C) 2.3 in
September 63°F (17°C) 2.4 in
October 50°F (10°C) 1.5 in
November 34°F (1°C) 0.9 in
December 23°F (-5°C) 0.7 in

Gregory has a seasonal temperature swing of 53°F / from 21°F in January to 74°F in July. Total annual precipitation is 23.8 inches, with June being the wettest month (3.6") and January the driest (0.5").

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