Updated October 2026
Greenbrier State Park: Weather by Month and When to Go
Greenbrier State Park is a state park in Maryland. Average highs range from 40°F in January to 86°F in July.
Average highs sit between 60°F and 80°F in April through May and September through October. They run above 80°F in June through August and below 60°F in November through March. The figures are NOAA climate normals for 1991–2020, measured at a weather station 8.2 miles from the park.
Warmest average high
86°F
July
Coldest average low
22°F
January
Most precipitation
4.8 in
September
Longest days
14.8 h
June
Greenbrier State Park weather by month
| Month | Average high | Average low | Precipitation | Daylight |
|---|---|---|---|---|
| January | 40°F | 22°F | 3.2 in | 9.5 h |
| February | 44°F | 25°F | 2.7 in | 10.5 h |
| March | 53°F | 32°F | 3.9 in | 11.7 h |
| April | 65°F | 41°F | 3.9 in | 13.1 h |
| May | 74°F | 53°F | 4.3 in | 14.2 h |
| June | 83°F | 62°F | 3.4 in | 14.8 h |
| July | 86°F | 66°F | 3.7 in | 14.5 h |
| August | 85°F | 65°F | 3.7 in | 13.6 h |
| September | 78°F | 56°F | 4.8 in | 12.2 h |
| October | 66°F | 45°F | 3.4 in | 10.9 h |
| November | 54°F | 34°F | 2.9 in | 9.8 h |
| December | 44°F | 27°F | 3.7 in | 9.2 h |
Temperature and precipitation figures are NOAA climate normals for 1991–2020 from station USC00181790, the nearest station with a complete set of temperature normals, 8.2 miles from the park. Conditions in the park can differ from the station's, most of all where the two sit at different elevations. Daylight is calculated for the park's latitude at the middle of each month.
What the averages show
- Temperature. July is the warmest month, with an average high of 86°F and an average low of 66°F. January is the coldest month, with an average low of 22°F and an average high of 40°F.
- Precipitation. September is the wettest month, averaging 4.8 inches of precipitation, and February is the driest, at 2.7 inches. An average year brings about 43.6 inches in total.
- Snowfall. The station has no snowfall normal, so snowfall is left out of the table. That is a gap in the station's record, not a sign that it never snows here.
- Daylight. Days run from about 9.2 hours of daylight in December to 14.8 hours in June.
Camping, trails, maps and fees
Whether Greenbrier State Park has camping or cabins, where its trails run, when it opens and what it charges are all published by the agency that runs the park. Its official page is the place to check before a trip.
Official Greenbrier State Park page
For the forecast rather than the averages, the National Weather Service issues a point forecast for the park's location.
Where to stay near Greenbrier State Park
Hotels, cabins and vacation rentals near Greenbrier State Park, with live availability and prices.
Top-rated places to stay near Greenbrier State Park
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Frequently Asked Questions
July is the warmest month, with an average high of 86°F and an average low of 66°F. January is the coldest month, with an average low of 22°F and an average high of 40°F. These are NOAA 1991–2020 climate normals from a weather station 8.2 miles from the park.
Average highs sit between 60°F and 80°F in April through May and September through October. They run above 80°F in June through August and below 60°F in November through March.
September is the wettest month, averaging 4.8 inches of precipitation, and February is the driest, at 2.7 inches. An average year brings about 43.6 inches in total. The station has no snowfall normal, so no snowfall figure is available.
Days run from about 9.2 hours of daylight in December to 14.8 hours in June. The hours are calculated for the park's latitude.
Nearest National Park Service sites
- Antietam National Battlefield8 miles away
- Catoctin Mountain Park12 miles away
- Harpers Ferry National Historical Park16 miles away
Nearby state parks
- Cunningham Falls State Park11 miles away
- Seneca Creek State Park34 miles away
- Codorus State Park42 miles away · Pennsylvania
- Gifford Pinchot State Park54 miles away · Pennsylvania
Distances are measured in a straight line from the park, so the drive is longer.
Sources: NOAA NCEI U.S. Climate Normals 1991–2020; USGS Protected Areas Database for location; the official Maryland state park listing for the park's name.