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 42°F (6°C). Winters average 8°F in January while summers reach 71°F in July / a wide seasonal temperature swing of 63°F. Annual precipitation totals 20.0 inches (drier than the 38-inch national average). The area receives 39.1 inches of snow annually, a moderate snowfall amount. The city sits at an elevation of 842 feet.
Temperature
8°F Jan (-14°C)
71°F Jul (22°C)
| Annual Average | 42.0°F |
| 22% below US avg | |
| January Average | 8°F (-14°C) |
| July Average | 71°F (22°C) |
Geography
| Elevation | 842 ft (257 m) |
| Area | 1.1 sq mi (2.7 km²) |
| Population Density | 300/sq mi |
| Coordinates | 48.6192°N, 97.4471°W |
| Timezone | America/Chicago |
| County | Pembina County County |
| Nearest Airport | Grand Forks International (GFK) 48 miles away |
Precipitation & Snow
Air Quality
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 20.9 / 100 |
| Social Vulnerability | 58.4 / 100 |
| Community Resilience | 31.9 / 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 | 8°F (-14°C) | 0.3 in | Coldest, Driest |
| February | 13°F (-11°C) | 0.3 in | |
| March | 26°F (-3°C) | 0.7 in | |
| April | 43°F (6°C) | 1.1 in | |
| May | 57°F (14°C) | 2.9 in | |
| June | 68°F (20°C) | 3.8 in | Wettest |
| July | 71°F (22°C) | 3.4 in | Warmest |
| August | 70°F (21°C) | 2.3 in | |
| September | 61°F (16°C) | 2.3 in | |
| October | 45°F (7°C) | 1.7 in | |
| November | 29°F (-2°C) | 0.7 in | |
| December | 14°F (-10°C) | 0.5 in |
St. Thomas has a seasonal temperature swing of 64°F / from 8°F in January to 71°F in July. Total annual precipitation is 20.0 inches, with June being the wettest month (3.8") and January the driest (0.3").