Sign In Register

Weather & Climate in St. Thomas, ND

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

St. Thomas has a cool climate with an average annual temperature of 38°F (4°C). Winters average 4°F in January while summers reach 68°F in July / a wide seasonal temperature swing of 64°F. The area gets 269 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 22.1 inches (drier than the 38-inch national average). Air quality is rated Good with a median AQI of 38. The city sits at an elevation of 842 feet.

Temperature

4°F Jan (-16°C) 68°F Jul (20°C)
Annual Average38.4°F
29% below US avg
January Average4°F (-16°C)
July Average68°F (20°C)
Sunny Days269 days/yr

Geography

Elevation842 ft (257 m)
Area1.1 sq mi (2.7 km²)
Population Density300/sq mi
Coordinates48.6192°N, 97.4471°W
TimezoneAmerica/Chicago
CountyPembina County County
Nearest AirportGrand Forks International (GFK)
48 miles away

Precipitation & Snow

Annual Rainfall 22.1"
42% below US avg
Wettest Month (Jun) 3.43"
Driest Month (Feb) 0.47"

Air Quality

AQI Median38.0
RatingGood

Natural Hazard Risk

Overall RiskVery Low
Risk Score20.9 / 100
Social Vulnerability58.4 / 100
Community Resilience31.9 / 100

Hazard Breakdown

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

Tornado History

311 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 1 fatality, 31 injuries.

Date Rating Distance Path Fatalities
Jun 6, 1999 EF4 25 km 8.0 mi 0
May 19, 2004 EF3 43 km 1.5 mi 0
Aug 11, 1958 EF3 82 km 0.1 mi 0
Jun 9, 2017 EF2 60 km 18.0 mi 0
Sep 19, 2014 EF2 41 km 10.0 mi 0
Jun 17, 2010 EF2 81 km 7.0 mi 0
Jul 2, 2005 EF2 48 km 2.0 mi 0
Jul 2, 2005 EF2 43 km 1.5 mi 0
Jul 2, 2005 EF2 35 km 4.0 mi 0
Jul 2, 2005 EF2 40 km 1.5 mi 0
Jun 23, 2005 EF2 51 km 1.0 mi 0
Jun 23, 2005 EF2 96 km 2.0 mi 0
May 19, 2004 EF2 39 km 0.7 mi 0
Jul 14, 1999 EF2 52 km 2.0 mi 0
Jun 6, 1999 EF2 56 km 3.1 mi 0
Jun 6, 1999 EF2 64 km 3.0 mi 0
Jun 24, 1985 EF2 60 km 0.5 mi 0
May 26, 1978 EF2 44 km 0.5 mi 0
Jul 13, 1977 EF2 90 km 2.0 mi 0
Jul 13, 1977 EF2 63 km 1.0 mi 0
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: JUNEBERRY 3 (29,455 acres, 2011).

Year Name Acres Burned Distance
2011 JUNEBERRY 3 29,455 89 km
1988 UNNAMED 22,262 93 km
2007 UNNAMED 21,954 94 km
1988 UNNAMED 17,778 71 km
2003 CARIBOU 16,184 78 km
1988 UNNAMED 11,927 75 km
2003 UNNAMED 11,544 74 km
2018 NORTH COUNTY ROAD 7 9,471 81 km
2000 UNNAMED 9,194 76 km
2006 UNNAMED 6,964 81 km
2000 UNNAMED 6,057 72 km
1985 UNNAMED 5,891 74 km
2008 UNNAMED 4,724 78 km
2012 COUNTY 27 FIRE 4,653 67 km
2008 UNNAMED 3,624 81 km
1999 UNNAMED 3,536 71 km
2002 CAMELBACK BRIDGE 3,519 97 km
2002 HONEY JOE 3,514 89 km
1999 UNNAMED 3,351 76 km
2000 UNNAMED 3,224 68 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 4°F (-16°C) 0.6 in Coldest
February 10°F (-12°C) 0.5 in Driest
March 23°F (-5°C) 0.8 in
April 41°F (5°C) 1.2 in
May 56°F (13°C) 2.3 in
June 65°F (18°C) 3.4 in Wettest
July 68°F (20°C) 2.9 in Warmest
August 67°F (19°C) 2.4 in
September 57°F (14°C) 1.9 in
October 44°F (7°C) 1.4 in
November 25°F (-4°C) 0.8 in
December 9°F (-13°C) 0.5 in

St. Thomas has a seasonal temperature swing of 64°F / from 4°F in January to 68°F in July. Total annual precipitation is 18.7 inches, with June being the wettest month (3.4") and February the driest (0.5").

View full profile of St. Thomas, ND →