Weather & Climate in Mount Pleasant, PA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Mount Pleasant experiences four distinct seasons with an average annual temperature of 51°F (10°C). Winters average 29°F in January while summers reach 71°F in July. Annual precipitation totals 43.9 inches. The area receives 29.8 inches of snow annually, a moderate snowfall amount. Air quality is rated Good with a median AQI of 39. 77% of days have good air quality. The city sits at an elevation of 1,199 feet.
Temperature
29°F Jan (-2°C)
71°F Jul (22°C)
| Annual Average | 50.5°F |
| 6% below US avg | |
| January Average | 29°F (-2°C) |
| July Average | 71°F (22°C) |
Geography
| Elevation | 1,199 ft (365 m) |
| Area | 0.4 sq mi (1.0 km²) |
| Population Density | 4,215/sq mi |
| Coordinates | 40.1509°N, 79.5434°W |
| Timezone | America/New_York |
| County | Westmoreland County County |
| Nearest Airport | Arnold Palmer Regional (LBE) 11 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 39.0 |
| Rating | Good |
| Good Days % | 76.6% |
| Unhealthy Days | 0 |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 87.9 / 100 |
| Social Vulnerability | 30.2 / 100 |
| Community Resilience | 92.8 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Relatively Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively High |
| Hail | Relatively Moderate |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively High |
| Ice Storm | Relatively Moderate |
| Drought | Very Low |
| Cold Wave | Very Low |
| Landslide | Relatively Moderate |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
1 earthquake (M2.5+) recorded within 150 km since 1990. Strongest on record: M2.5.
| Sep 11, 2024 | 4 km WNW of Claysville, Pennsylvania | M2.5 | 78 km | 4 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tornado History
251 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 7 fatalities, 441 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 2, 1998 | EF4 | 30 km | 36.5 mi | 0 |
| Jun 3, 1980 | EF4 | 58 km | 11.8 mi | 0 |
| May 31, 1998 | EF3 | 60 km | 13.0 mi | 1 |
| Jun 3, 1980 | EF3 | 76 km | 29.8 mi | 0 |
| Jul 11, 1976 | EF3 | 22 km | 11.8 mi | 1 |
| May 19, 1967 | EF3 | 88 km | 0.3 mi | 1 |
| Aug 3, 1963 | EF3 | 34 km | 0.1 mi | 2 |
| Jun 26, 2024 | EF2 | 29 km | 10.8 mi | 0 |
| May 11, 2024 | EF2 | 46 km | 5.8 mi | 0 |
| Aug 25, 2023 | EF2 | 23 km | 2.0 mi | 0 |
| Aug 1, 2022 | EF2 | 86 km | 1.8 mi | 0 |
| Mar 31, 2022 | EF2 | 77 km | 8.6 mi | 0 |
| Oct 21, 2021 | EF2 | 82 km | 15.7 mi | 0 |
| Oct 2, 2018 | EF2 | 12 km | 1.6 mi | 0 |
| Mar 23, 2011 | EF2 | 22 km | 9.0 mi | 0 |
| Apr 28, 2002 | EF2 | 54 km | 5.0 mi | 0 |
| Jun 2, 1998 | EF2 | 43 km | 15.0 mi | 0 |
| Jun 2, 1998 | EF2 | 46 km | 12.0 mi | 0 |
| Jun 2, 1998 | EF2 | 96 km | 15.0 mi | 0 |
| Aug 15, 1997 | EF2 | 28 km | 3.5 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).
Wildfire History
2 wildfires (100+ acres) recorded within 100 km. Largest: BEAR DEN (945 acres, 2014).
| Year | Name | Acres Burned | Distance |
| 2014 | BEAR DEN | 945 | 82 km |
| 2005 | UNNAMED | 510 | 74 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 29°F (-2°C) | 3.3 in | Coldest |
| February | 31°F (-1°C) | 2.2 in | Driest |
| March | 39°F (4°C) | 3.4 in | |
| April | 49°F (10°C) | 3.6 in | |
| May | 59°F (15°C) | 4.3 in | |
| June | 67°F (20°C) | 4.9 in | Wettest |
| July | 71°F (22°C) | 4.4 in | Warmest |
| August | 70°F (21°C) | 4.0 in | |
| September | 63°F (17°C) | 3.5 in | |
| October | 52°F (11°C) | 3.2 in | |
| November | 42°F (5°C) | 3.4 in | |
| December | 34°F (1°C) | 3.8 in |
Mount Pleasant has a seasonal temperature swing of 42°F / from 29°F in January to 71°F in July. Total annual precipitation is 43.9 inches, with June being the wettest month (4.9") and February the driest (2.2").