Updated October 2026
Johnstown Flood National Memorial Weather by Month
Johnstown Flood National Memorial is warmest in July, when the nearest NOAA climate station averages a high of 79°F and a low of 61°F, and coldest in January, with an average high of 33°F and an average low of 19°F. June is the wettest month, with about 4.4 inches of precipitation.
These figures are NOAA's 1991–2020 climate normals, the 30-year average for each calendar month, from the nearest long-record weather station, 3.7 miles from the park's reference point. A single station cannot describe a whole park: temperatures elsewhere in Johnstown Flood National Memorial can differ from these, particularly with elevation.
Warmest month
Jul
79°F avg high
Coldest month
Jan
19°F avg low
Wettest month
Jun
4.4 in avg
Longest days
Jun
14.9 h of daylight
Average weather at Johnstown Flood by month
| Month | Avg high | Avg low | Precipitation | Daylight |
|---|---|---|---|---|
| January | 33°F | 19°F | 2.5 in | 9.4 h |
| February | 36°F | 21°F | 2.5 in | 10.5 h |
| March | 45°F | 28°F | 3.1 in | 11.7 h |
| April | 58°F | 38°F | 3.5 in | 13.1 h |
| May | 68°F | 49°F | 4.1 in | 14.2 h |
| June | 75°F | 57°F | 4.4 in | 14.9 h |
| July | 79°F | 61°F | 4.2 in | 14.6 h |
| August | 77°F | 60°F | 4.0 in | 13.6 h |
| September | 71°F | 53°F | 4.0 in | 12.3 h |
| October | 59°F | 43°F | 3.1 in | 10.9 h |
| November | 47°F | 33°F | 3.1 in | 9.7 h |
| December | 38°F | 25°F | 2.7 in | 9.1 h |
| Year total | 41.2 in |
NOAA 1991–2020 climate normals from station USW00004726, 3.7 miles from the park's reference point. Daylight is the monthly average, computed from the park's latitude. Each month links to how crowded Johnstown Flood is at that time of year.
Johnstown Flood weather by season
Winter: December to February
Average highs bottom out at 33°F in January, between 38°F in December and 36°F in February, with average lows between 19°F and 25°F. The average low is at or below freezing in all three months. Together the three months average 7.7 inches of precipitation, about 19% of the yearly total and less than in any other season. Daylight is at its shortest, about 9.1 hours in December.
Spring: March to May
Average highs climb from 45°F in March to 68°F in May, with average lows between 28°F and 49°F. The average low is at or below freezing in March. Together the three months average 10.7 inches of precipitation, about 26% of the yearly total. Daylight lengthens from about 11.7 hours in March to 14.2 in May.
Summer: June to August
Average highs peak at 79°F in July, between 75°F in June and 77°F in August, with average lows between 57°F and 61°F. Together the three months average 12.6 inches of precipitation, about 31% of the yearly total and more than in any other season. Daylight is at its longest, about 14.9 hours in June.
Fall: September to November
Average highs fall from 71°F in September to 47°F in November, with average lows between 33°F and 53°F. Together the three months average 10.2 inches of precipitation, about 25% of the yearly total. Daylight shortens from about 12.3 hours in September to 9.7 in November.
What the National Park Service says about the weather
Winters can be cold and severe. Spring can be seasonable and wet. Summer can be hot with potentials for thunderstorms. Fall can be seasonal, with cold temperatures into October and November.
Weather description courtesy of the National Park Service — official park site.
Today's forecast for Johnstown Flood
Averages describe a typical month, not this week. For current conditions and the seven-day outlook, the National Weather Service issues a forecast for the park's reference point at 40.35°N, 78.77°W. It covers that one spot, so other elevations in the park can differ from it, as they do from the averages above.
National Weather Service forecast for Johnstown Flood National Memorial →
Weather and crowds together
July is both the warmest month and the busiest, with about 1.8× the visitors of the park's average month. January is the quietest. To see those crowds set against the weather for all twelve months, read the best time to visit Johnstown Flood National Memorial. For hotels, cabins and rentals close to the park, see where to stay near Johnstown Flood.
Where to stay near Johnstown Flood
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Top-rated places to stay near Johnstown Flood
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Frequently Asked Questions
July is the warmest month at Johnstown Flood National Memorial, with an average high of 79°F and an average low of 61°F. That is the 1991–2020 average at the nearest long-record NOAA station, 3.7 miles from the park's reference point. Temperatures inside the park can differ, particularly with elevation.
January is the coldest month at Johnstown Flood National Memorial, with an average low of 19°F and an average high of 33°F, based on NOAA 1991–2020 climate normals.
June is the wettest month, with about 4.4 inches of precipitation. January and February are the driest, at about 2.5 inches each. The station records about 41.2 inches of precipitation in an average year.
Daylight at Johnstown Flood National Memorial runs from about 9.1 hours a day in December to about 14.9 hours in June, computed from the park's latitude.
Weather at nearby parks
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84 mi away · warmest in July (84°F)
Keep exploring
Sources: NOAA NCEI U.S. Climate Normals 1991–2020 (station USW00004726), daylight computed from latitude, weather description from the National Park Service, crowd levels from National Park Service Visitor Use Statistics (1979–2025). Updated 2026-10-11. Lodging results are provided by Stay22; WhenToVisitParks may earn a commission from bookings, at no extra cost to you.