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Weather & Climate in Johnstown, PA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Johnstown experiences four distinct seasons with an average annual temperature of 49°F (9°C). Winters average 26°F in January while summers reach 70°F in July. The area gets 275 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 41.3 inches. Air quality is rated Good with a median AQI of 40. The city sits at an elevation of 1,166 feet.
Temperature
26°F Jan (-3°C)
70°F Jul (21°C)
| Annual Average | 48.9°F |
| 9% below US avg | |
| January Average | 26°F (-3°C) |
| July Average | 70°F (21°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 1,166 ft (355 m) |
| Area | 5.9 sq mi (15.3 km²) |
| Population Density | 3,087/sq mi |
| Coordinates | 40.3261°N, 78.9191°W |
| Timezone | America/New_York |
| County | Cambria County County |
| Nearest Airport | Arnold Palmer Regional (LBE) 26 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 40.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 76.4 / 100 |
| Social Vulnerability | 60.4 / 100 |
| Community Resilience | 96.5 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Relatively Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Relatively Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Very Low |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively High |
| Ice Storm | Relatively Low |
| Drought | No Rating |
| Cold Wave | Relatively Moderate |
| Landslide | Relatively Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
3 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.4.
| Jun 13, 2019 | 9 km N of Blain, Pennsylvania | M3.4 | 120 km | 27 km |
| Jan 17, 2016 | 3 km NE of Ranson, West Virginia | M3.0 | 146 km | 5 km |
| Sep 11, 2024 | 4 km WNW of Claysville, Pennsylvania | M2.5 | 132 km | 4 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
213 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 5 fatalities, 340 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 2, 1998 | EF4 | 40 km | 36.5 mi | 0 |
| May 31, 1985 | EF4 | 97 km | 69.0 mi | 0 |
| Jun 3, 1980 | EF4 | 78 km | 11.8 mi | 0 |
| May 31, 1998 | EF3 | 66 km | 13.0 mi | 1 |
| Jul 11, 1976 | EF3 | 49 km | 11.8 mi | 1 |
| Aug 3, 1963 | EF3 | 82 km | 0.1 mi | 2 |
| Jun 26, 2024 | EF2 | 63 km | 10.8 mi | 0 |
| May 11, 2024 | EF2 | 97 km | 5.8 mi | 0 |
| Aug 25, 2023 | EF2 | 62 km | 2.0 mi | 0 |
| Mar 31, 2022 | EF2 | 68 km | 8.6 mi | 0 |
| Oct 2, 2018 | EF2 | 93 km | 4.1 mi | 0 |
| Oct 2, 2018 | EF2 | 46 km | 1.6 mi | 0 |
| Mar 23, 2011 | EF2 | 70 km | 9.0 mi | 0 |
| Apr 28, 2002 | EF2 | 38 km | 5.0 mi | 0 |
| Jun 2, 1998 | EF2 | 59 km | 15.0 mi | 0 |
| Jun 2, 1998 | EF2 | 89 km | 12.0 mi | 0 |
| Aug 15, 1997 | EF2 | 34 km | 3.5 mi | 0 |
| Jul 19, 1996 | EF2 | 67 km | 27.4 mi | 0 |
| Jul 19, 1996 | EF2 | 29 km | 6.0 mi | 0 |
| Jul 19, 1996 | EF2 | 90 km | 10.0 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 | 58 km |
| 2005 | UNNAMED | 510 | 55 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 26°F (-3°C) | 3.0 in | Coldest |
| February | 28°F (-2°C) | 2.8 in | Driest |
| March | 37°F (3°C) | 3.7 in | |
| April | 47°F (8°C) | 3.7 in | |
| May | 57°F (14°C) | 4.2 in | |
| June | 66°F (19°C) | 4.2 in | |
| July | 70°F (21°C) | 4.4 in | Warmest, Wettest |
| August | 68°F (20°C) | 3.7 in | |
| September | 62°F (17°C) | 3.7 in | |
| October | 51°F (10°C) | 3.0 in | |
| November | 41°F (5°C) | 3.5 in | |
| December | 31°F (-1°C) | 3.2 in |
Johnstown has a seasonal temperature swing of 44°F / from 26°F in January to 70°F in July. Total annual precipitation is 43.1 inches, with July being the wettest month (4.4") and February the driest (2.8").