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Weather & Climate in Union, SC

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

Union enjoys a temperate climate with an average annual temperature of 60°F (16°C). Winters average 41°F in January while summers reach 79°F in July. The area gets 310 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 45.3 inches. The area receives 1.9 inches of snow annually. Air quality is rated Good with a median AQI of 43. The city sits at an elevation of 630 feet.

Temperature

41°F Jan (5°C) 79°F Jul (26°C)
Annual Average60.4°F
12% above US avg
January Average41°F (5°C)
July Average79°F (26°C)
Sunny Days310 days/yr

Geography

Elevation630 ft (192 m)
Area8.0 sq mi (20.7 km²)
Population Density986/sq mi
Coordinates34.7235°N, 81.6248°W
TimezoneAmerica/New_York
CountyUnion County County
Nearest AirportGreenville Spartanburg International (GSP)
36 miles away

Precipitation & Snow

Annual Rainfall 45.3"
19% above US avg
Snowfall 1.9"
Wettest Month (Mar) 5.00"
Driest Month (Apr) 3.15"

Air Quality

AQI Median43.0
RatingGood

Natural Hazard Risk

Overall RiskRelatively Low
Risk Score58.2 / 100
Social Vulnerability95.6 / 100
Community Resilience40.8 / 100

Hazard Breakdown

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

Earthquake History

49 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.1.

Feb 15, 2014 12 km ENE of Parksville, South Carolina M4.1 110 km 5 km
Apr 13, 1998 9 km S of Kershaw, South Carolina M3.9 98 km 7 km
Jun 29, 2022 6 km E of Elgin, South Carolina M3.6 103 km 3 km
Jun 29, 2022 6 km E of Elgin, South Carolina M3.5 103 km 3 km
Jan 3, 1992 4 km ENE of Willington, South Carolina M3.4 110 km 3 km
Jun 26, 2022 6 km E of Elgin, South Carolina M3.4 103 km 4 km
May 9, 2022 5 km ESE of Elgin, South Carolina M3.3 103 km 4 km
Jun 4, 2023 4 km NNW of West Canton, North Carolina M3.2 148 km 0 km
Jun 20, 2017 6 km SW of Augusta, Georgia M3.2 149 km 13 km
Jun 5, 1998 4 km SSE of Mooresville, North Carolina M3.2 120 km 9 km
Aug 8, 1993 12 km ENE of Aiken, South Carolina M3.2 125 km 9 km
Aug 23, 2025 3 km N of Coronaca, South Carolina M3.0 65 km 2 km
Aug 4, 2007 12 km ENE of Lake Lure, North Carolina M3.0 95 km 9 km
Feb 16, 2014 13 km WNW of Edgefield, South Carolina M3.0 107 km 7 km
Jan 1, 1993 4 km SSW of Spruce Pine, North Carolina M3.0 135 km 2 km
Feb 18, 2005 7 km ENE of Irmo, South Carolina M2.9 82 km 1 km
Aug 23, 2025 3 km NNW of Coronaca, South Carolina M2.9 66 km 7 km
Mar 6, 2006 3 km W of Burnsville, North Carolina M2.8 147 km 4 km
Apr 26, 2013 9 km E of Lincolnton, Georgia M2.8 126 km 12 km
Sep 18, 1996 6 km E of Clarks Hill, South Carolina M2.8 124 km 14 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Hurricane History

7 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 4.

Year Name Category Max Wind Closest
2022 Ian Category 1 81 mph 274 km
2016 Matthew Category 2 98 mph 274 km
2004 Charley Category 1 81 mph 275 km
2004 Gaston Category 1 75 mph 268 km
1996 Fran Category 1 75 mph 272 km
1989 Hugo Category 4 138 mph 48 km
1985 Bob Category 1 75 mph 299 km
Source: NOAA IBTrACS (Category 1+, 1980–2026).

Tornado History

467 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 32 fatalities, 737 injuries.

Date Rating Distance Path Fatalities
May 5, 1989 EF4 48 km 15.0 mi 2
May 5, 1989 EF4 83 km 14.0 mi 4
May 5, 1989 EF4 87 km 13.0 mi 1
Mar 28, 1984 EF4 94 km 4.0 mi 0
Mar 28, 1984 EF4 48 km 21.0 mi 5
Dec 13, 1973 EF4 71 km 1.0 mi 2
Apr 8, 1957 EF4 96 km 121.4 mi 4
Mar 15, 2008 EF3 56 km 27.5 mi 0
Aug 16, 1994 EF3 95 km 8.0 mi 0
Aug 16, 1994 EF3 96 km 0.3 mi 0
Aug 16, 1994 EF3 14 km 30.0 mi 0
Mar 27, 1994 EF3 69 km 18.5 mi 0
Oct 18, 1990 EF3 91 km 12.0 mi 0
Mar 28, 1984 EF3 49 km 19.0 mi 0
Dec 13, 1973 EF3 59 km 17.3 mi 1
Dec 13, 1973 EF3 71 km 10.7 mi 0
Dec 13, 1973 EF3 83 km 17.7 mi 0
May 27, 1973 EF3 74 km 60.2 mi 0
May 10, 1952 EF3 58 km 22.7 mi 2
May 5, 2020 EF2 57 km 14.0 mi 0
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: CHESTNUT KNOB (6,418 acres, 2016).

Year Name Acres Burned Distance
2016 CHESTNUT KNOB 6,418 100 km
2010 BURNING UNIT 5,567 18 km
2010 C-94-95 133 RX 3,192 29 km
2010 UNNAMED 2,909 31 km
2015 UNNAMED 2,690 28 km
2017 UNNAMED 2,514 24 km
2009 UNNAMED 2,458 28 km
2017 UNNAMED 2,395 13 km
2017 UNNAMED 2,362 14 km
2013 UNNAMED 2,274 28 km
2013 UNNAMED 2,237 24 km
2010 C-142 RX 2,149 33 km
2021 UNNAMED 2,024 18 km
2019 UNNAMED 2,000 22 km
2016 UNNAMED 1,964 19 km
2009 UNNAMED 1,918 15 km
2013 UNNAMED 1,897 38 km
2014 UNNAMED 1,879 33 km
2020 PARSONS MTN SOUTH LC 1,878 98 km
2018 C-140 EN 1,860 11 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 41°F (5°C) 4.5 in Coldest
February 45°F (7°C) 4.1 in
March 52°F (11°C) 5.0 in Wettest
April 60°F (16°C) 3.2 in Driest
May 68°F (20°C) 3.7 in
June 75°F (24°C) 4.1 in
July 79°F (26°C) 4.1 in Warmest
August 78°F (25°C) 4.3 in
September 72°F (22°C) 4.1 in
October 61°F (16°C) 3.8 in
November 51°F (11°C) 3.5 in
December 44°F (6°C) 3.7 in

Union has a seasonal temperature swing of 38°F / from 41°F in January to 79°F in July. Total annual precipitation is 47.9 inches, with March being the wettest month (5.0") and April the driest (3.2").

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