Updated October 2026
Frederick Law Olmsted National Historic Site Weather by Month
Frederick Law Olmsted National Historic Site is warmest in July, when the nearest NOAA climate station averages a high of 85°F and a low of 64°F, and coldest in January, with an average high of 37°F and an average low of 19°F. December is the wettest month, with about 5.1 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, 1.5 miles from the park's reference point. A single station cannot describe a whole park: temperatures elsewhere in Frederick Law Olmsted National Historic Site can differ from these, particularly with elevation.
Warmest month
Jul
85°F avg high
Coldest month
Jan
19°F avg low
Wettest month
Dec
5.1 in avg
Longest days
Jun
15.1 h of daylight
Average weather at Frederick Law Olmsted by month
| Month | Avg high | Avg low | Precipitation | Daylight |
|---|---|---|---|---|
| January | 37°F | 19°F | 3.9 in | 9.2 h |
| February | 40°F | 21°F | 3.6 in | 10.3 h |
| March | 47°F | 28°F | 4.5 in | 11.7 h |
| April | 59°F | 38°F | 4.3 in | 13.2 h |
| May | 69°F | 48°F | 3.6 in | 14.4 h |
| June | 79°F | 58°F | 4.2 in | 15.1 h |
| July | 85°F | 64°F | 3.5 in | 14.8 h |
| August | 83°F | 63°F | 3.7 in | 13.7 h |
| September | 76°F | 55°F | 4.0 in | 12.3 h |
| October | 64°F | 43°F | 5.0 in | 10.8 h |
| November | 53°F | 34°F | 4.0 in | 9.5 h |
| December | 42°F | 26°F | 5.1 in | 8.9 h |
| Year total | 49.4 in |
NOAA 1991–2020 climate normals from station USC00193890, 1.5 miles from the park's reference point. Daylight is the monthly average, computed from the park's latitude. Each month links to how crowded Frederick Law Olmsted is at that time of year.
Frederick Law Olmsted weather by season
Winter: December to February
Average highs bottom out at 37°F in January, between 42°F in December and 40°F in February, with average lows between 19°F and 26°F. The average low is at or below freezing in all three months. Together the three months average 12.6 inches of precipitation, about 26% of the yearly total. Daylight is at its shortest, about 8.9 hours in December.
Spring: March to May
Average highs climb from 47°F in March to 69°F in May, with average lows between 28°F and 48°F. The average low is at or below freezing in March. Together the three months average 12.4 inches of precipitation, about 25% of the yearly total. Daylight lengthens from about 11.7 hours in March to 14.4 in May.
Summer: June to August
Average highs peak at 85°F in July, between 79°F in June and 83°F in August, with average lows between 58°F and 64°F. Together the three months average 11.4 inches of precipitation, about 23% of the yearly total and less than in any other season. Daylight is at its longest, about 15.1 hours in June.
Fall: September to November
Average highs fall from 76°F in September to 53°F in November, with average lows between 34°F and 55°F. Together the three months average 13 inches of precipitation, about 26% of the yearly total and more than in any other season. Daylight shortens from about 12.3 hours in September to 9.5 in November.
What the National Park Service says about the weather
Summer: Warm temperatures, average high temperature around 80 degrees Fahrenheit, often with humidity. July and August bring the hottest temperatures. Fall: Cooler temperatures, mean temperatures between 45 and 65 degrees Fahrenheit, sometimes rainy. Peak fall foliage is in mid-October. Winter: Cold, with snow, average low temperature around 25 degrees Fahrenheit. Spring: Cold to cool temperatures, average mean temperatures between 40 and 60 degrees Fahrenheit.
Weather description courtesy of the National Park Service — official park site.
Today's forecast for Frederick Law Olmsted
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 42.32°N, 71.13°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 Frederick Law Olmsted National Historic Site →
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 Frederick Law Olmsted National Historic Site. For hotels, cabins and rentals close to the park, see where to stay near Frederick Law Olmsted.
Where to stay near Frederick Law Olmsted
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Frequently Asked Questions
July is the warmest month at Frederick Law Olmsted National Historic Site, with an average high of 85°F and an average low of 64°F. That is the 1991–2020 average at the nearest long-record NOAA station, 1.5 miles from the park's reference point. Temperatures inside the park can differ, particularly with elevation.
January is the coldest month at Frederick Law Olmsted National Historic Site, with an average low of 19°F and an average high of 37°F, based on NOAA 1991–2020 climate normals.
December is the wettest month, with about 5.1 inches of precipitation. July is the driest, at about 3.5 inches. The station records about 49.4 inches of precipitation in an average year.
Daylight at Frederick Law Olmsted National Historic Site runs from about 8.9 hours a day in December to about 15.1 hours in June, computed from the park's latitude.
Weather at nearby parks
2 mi away · warmest in July (85°F)
4 mi away · warmest in July (82°F)
4 mi away · warmest in July (85°F)
5 mi away · warmest in July (82°F)
8 mi away · warmest in July (83°F)
12 mi away · warmest in July (84°F)
Keep exploring
Sources: NOAA NCEI U.S. Climate Normals 1991–2020 (station USC00193890), daylight computed from latitude, weather description from the National Park Service, crowd levels from National Park Service Visitor Use Statistics (1981–2025). Updated 2026-10-11. Lodging results are provided by Stay22; WhenToVisitParks may earn a commission from bookings, at no extra cost to you.