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Weather & Climate in Blenheim, SC
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Blenheim enjoys a temperate climate with an average annual temperature of 63°F (17°C). Winters average 45°F in January while summers reach 81°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 41.7 inches. Air quality is rated Good with a median AQI of 43. The city sits at an elevation of 114 feet.
Temperature
45°F Jan (7°C)
81°F Jul (27°C)
| Annual Average | 63.4°F |
| 17% above US avg | |
| January Average | 45°F (7°C) |
| July Average | 81°F (27°C) |
| Sunny Days | 310 days/yr |
Geography
| Elevation | 114 ft (35 m) |
| Area | 0.7 sq mi (1.7 km²) |
| Population Density | 71/sq mi |
| Coordinates | 34.5098°N, 79.6525°W |
| Timezone | America/New_York |
| County | Marlboro County County |
| Nearest Airport | Florence Regional (FLO) 23 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 57.5 / 100 |
| Social Vulnerability | 97.8 / 100 |
| Community Resilience | 17.6 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Relatively Moderate |
| Earthquake | Relatively Low |
| Wildfire | Relatively Low |
| Flood | Relatively Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively High |
| Drought | Relatively Low |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
16 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.9.
| Apr 13, 1998 | 9 km S of Kershaw, South Carolina | M3.9 | 87 km | 7 km |
| Jun 29, 2022 | 6 km E of Elgin, South Carolina | M3.6 | 106 km | 3 km |
| Jun 29, 2022 | 6 km E of Elgin, South Carolina | M3.5 | 106 km | 3 km |
| Jun 26, 2022 | 6 km E of Elgin, South Carolina | M3.4 | 106 km | 4 km |
| May 9, 2022 | 5 km ESE of Elgin, South Carolina | M3.3 | 106 km | 4 km |
| Feb 18, 2005 | 7 km ENE of Irmo, South Carolina | M2.9 | 141 km | 1 km |
| Jan 29, 1994 | 12 km NNE of Alcolu, South Carolina | M2.9 | 86 km | 2 km |
| Mar 21, 2011 | 9 km S of Cordova, North Carolina | M2.9 | 39 km | 8 km |
| May 10, 2022 | 5 km E of Elgin, South Carolina | M2.8 | 106 km | 2 km |
| Mar 9, 2024 | 5 km E of Elgin, South Carolina | M2.7 | 106 km | 3 km |
| Jan 5, 2022 | 5 km SW of Lugoff, South Carolina | M2.6 | 105 km | 0 km |
| Apr 26, 2025 | 6 km E of Elgin, South Carolina | M2.6 | 106 km | 2 km |
| May 10, 2022 | 6 km E of Elgin, South Carolina | M2.6 | 105 km | 2 km |
| Jan 3, 2022 | 5 km S of Lugoff, South Carolina | M2.5 | 103 km | 2 km |
| Sep 15, 2024 | 6 km E of Elgin, South Carolina | M2.5 | 105 km | 2 km |
| Jul 29, 2012 | 7 km NNW of Wallace, South Carolina | M2.5 | 36 km | 14 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
22 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 | 141 km |
| 2020 | Isaias | Category 1 | 92 mph | 126 km |
| 2019 | Dorian | Category 3 | 115 mph | 199 km |
| 2018 | Florence | Category 2 | 104 mph | 128 km |
| 2016 | Matthew | Category 2 | 98 mph | 127 km |
| 2014 | Arthur | Category 2 | 98 mph | 203 km |
| 2011 | Irene | Category 1 | 86 mph | 275 km |
| 2005 | Ophelia | Category 1 | 86 mph | 209 km |
| 2004 | Alex | Category 2 | 98 mph | 264 km |
| 2004 | Charley | Category 1 | 81 mph | 118 km |
| 2004 | Gaston | Category 1 | 75 mph | 168 km |
| 2003 | Isabel | Category 2 | 98 mph | 281 km |
| 1999 | Irene | Category 2 | 92 mph | 228 km |
| 1999 | Floyd | Category 2 | 104 mph | 171 km |
| 1999 | Dennis | Category 2 | 104 mph | 269 km |
| 1998 | Bonnie | Category 3 | 115 mph | 179 km |
| 1996 | Fran | Category 3 | 115 mph | 116 km |
| 1996 | Bertha | Category 2 | 104 mph | 172 km |
| 1989 | Hugo | Category 4 | 138 mph | 127 km |
| 1986 | Charley | Category 1 | 75 mph | 280 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tornado History
376 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 50 fatalities, 1,493 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Nov 7, 1995 | EF4 | 49 km | 0.7 mi | 0 |
| Mar 28, 1984 | EF4 | 18 km | 17.0 mi | 7 |
| Mar 28, 1984 | EF4 | 90 km | 4.0 mi | 0 |
| Mar 28, 1984 | EF4 | 26 km | 7.0 mi | 0 |
| Mar 28, 1984 | EF4 | 14 km | 40.0 mi | 4 |
| Apr 8, 1957 | EF4 | 86 km | 121.4 mi | 4 |
| Apr 8, 1957 | EF4 | 46 km | 0.8 mi | 0 |
| Apr 16, 2011 | EF3 | 74 km | 52.9 mi | 2 |
| Apr 16, 2011 | EF3 | 97 km | 65.2 mi | 6 |
| Sep 7, 2004 | EF3 | 89 km | 7.0 mi | 0 |
| Mar 28, 1984 | EF3 | 80 km | 40.0 mi | 12 |
| May 20, 1980 | EF3 | 18 km | 10.7 mi | 0 |
| Feb 22, 1971 | EF3 | 92 km | 85.7 mi | 2 |
| Apr 18, 1969 | EF3 | 45 km | 77.3 mi | 0 |
| Nov 24, 1967 | EF3 | 76 km | 3.3 mi | 0 |
| Aug 29, 1964 | EF3 | 38 km | 21.9 mi | 0 |
| Mar 31, 2022 | EF2 | 85 km | 7.2 mi | 0 |
| Apr 13, 2020 | EF2 | 51 km | 0.2 mi | 0 |
| Jan 11, 2020 | EF2 | 81 km | 0.6 mi | 0 |
| Apr 16, 2011 | EF2 | 79 km | 13.1 mi | 1 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: UNNAMED (3,968 acres, 1991).
| Year | Name | Acres Burned | Distance |
| 1991 | UNNAMED | 3,968 | 32 km |
| 1991 | UNNAMED | 3,094 | 58 km |
| 1985 | UNNAMED | 2,743 | 34 km |
| 2008 | 05/05 RX BURN | 2,351 | 56 km |
| 2007 | 06-09 RX BURN | 2,054 | 55 km |
| 2022 | SCCRR-FY22-RX-PRESCRIBED FIRE | 2,039 | 58 km |
| 2000 | UNNAMED | 1,989 | 74 km |
| 2007 | LONGBRANCH-ROBESON COMPLEX | 1,944 | 55 km |
| 1998 | 981406 | 1,892 | 51 km |
| 1994 | CM 15 16 17 | 1,871 | 48 km |
| 2021 | SLATES CHURCH FIRE | 1,824 | 54 km |
| 1994 | COMP 1112 | 1,798 | 59 km |
| 1998 | 980803 | 1,780 | 51 km |
| 2000 | 2000 1003 | 1,768 | 56 km |
| 1999 | 19990505 | 1,756 | 55 km |
| 2016 | COUNTY LINE ROAD FIRE | 1,704 | 57 km |
| 1992 | COMP 15 | 1,697 | 51 km |
| 2018 | SCCRR-FY18-RX-COMP-14 | 1,687 | 53 km |
| 2012 | 4-NOV | 1,636 | 53 km |
| 1993 | UNNAMED | 1,623 | 53 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 45°F (7°C) | 4.0 in | Coldest |
| February | 46°F (8°C) | 3.7 in | |
| March | 54°F (12°C) | 4.3 in | |
| April | 62°F (17°C) | 2.8 in | Driest |
| May | 70°F (21°C) | 3.5 in | |
| June | 77°F (25°C) | 4.6 in | |
| July | 81°F (27°C) | 5.4 in | Warmest, Wettest |
| August | 79°F (26°C) | 4.9 in | |
| September | 73°F (23°C) | 3.7 in | |
| October | 62°F (17°C) | 3.0 in | |
| November | 54°F (12°C) | 2.8 in | |
| December | 46°F (8°C) | 3.2 in |
Blenheim has a seasonal temperature swing of 36°F / from 45°F in January to 81°F in July. Total annual precipitation is 45.9 inches, with July being the wettest month (5.4") and April the driest (2.8").