Updated October 2026
Harriet Tubman Underground Railroad National Historical Park Weather by Month
Harriet Tubman Underground Railroad National Historical Park is warmest in July, when the nearest NOAA climate station averages a high of 90°F and a low of 69°F, and coldest in January, with an average high of 48°F and an average low of 28°F.
These figures are NOAA's 1991–2020 climate normals, the 30-year average for each calendar month, from the nearest long-record weather station, 17.3 miles from the park's reference point. A single station cannot describe a whole park: temperatures elsewhere in Harriet Tubman Underground Railroad National Historical Park can differ from these, particularly with elevation.
Warmest month
Jul
90°F avg high
Coldest month
Jan
28°F avg low
Longest days
Jun
14.7 h of daylight
Average weather at Harriet Tubman Underground Railroad by month
| Month | Avg high | Avg low | Daylight |
|---|---|---|---|
| January | 48°F | 28°F | 9.6 h |
| February | 50°F | 29°F | 10.6 h |
| March | 58°F | 36°F | 11.7 h |
| April | 69°F | 44°F | 13.0 h |
| May | 78°F | 54°F | 14.1 h |
| June | 86°F | 63°F | 14.7 h |
| July | 90°F | 69°F | 14.4 h |
| August | 88°F | 67°F | 13.5 h |
| September | 82°F | 61°F | 12.2 h |
| October | 72°F | 49°F | 11.0 h |
| November | 61°F | 39°F | 9.9 h |
| December | 51°F | 31°F | 9.3 h |
NOAA 1991–2020 climate normals from station USC00189140, 17.3 miles from the park's reference point. Daylight is the monthly average, computed from the park's latitude. Each month links to how crowded Harriet Tubman Underground Railroad is at that time of year.
Harriet Tubman Underground Railroad weather by season
Winter: December to February
Average highs bottom out at 48°F in January, between 51°F in December and 50°F in February, with average lows between 28°F and 31°F. The average low is at or below freezing in all three months. Daylight is at its shortest, about 9.3 hours in December.
Spring: March to May
Average highs climb from 58°F in March to 78°F in May, with average lows between 36°F and 54°F. Daylight lengthens from about 11.7 hours in March to 14.1 in May.
Summer: June to August
Average highs peak at 90°F in July, between 86°F in June and 88°F in August, with average lows between 63°F and 69°F. The average high is 90°F or hotter in July. Daylight is at its longest, about 14.7 hours in June.
Fall: September to November
Average highs fall from 82°F in September to 61°F in November, with average lows between 39°F and 61°F. Daylight shortens from about 12.2 hours in September to 9.9 in November.
What the National Park Service says about the weather
Cambridge, Maryland generally experiences warm, humid summers and mild winters. Average summertime highs are in the 80s, with evening lows in the 60s. Winter temperatures usually range from the 30s to the 50s. Spring and fall are variable, but tend to be in the 50s and 60s. Precipitation is spread throughout the year. For more information, see: http://forecast.weather.gov/MapClick.php?lat=38.37100441991913&lon=-76.13347536809295#.WCNeYWorLIU
Weather description courtesy of the National Park Service — official park site.
Today's forecast for Harriet Tubman Underground Railroad
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 38.45°N, 76.14°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 Harriet Tubman Underground Railroad National Historical Park →
Weather and crowds together
July is both the warmest month and the busiest, with about 1.6× 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 Harriet Tubman Underground Railroad National Historical Park. For hotels, cabins and rentals close to the park, see where to stay near Harriet Tubman Underground Railroad.
Where to stay near Harriet Tubman Underground Railroad
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Frequently Asked Questions
July is the warmest month at Harriet Tubman Underground Railroad National Historical Park, with an average high of 90°F and an average low of 69°F. That is the 1991–2020 average at the nearest long-record NOAA station, 17.3 miles from the park's reference point. Temperatures inside the park can differ, particularly with elevation.
January is the coldest month at Harriet Tubman Underground Railroad National Historical Park, with an average low of 28°F and an average high of 48°F, based on NOAA 1991–2020 climate normals.
Daylight at Harriet Tubman Underground Railroad National Historical Park runs from about 9.3 hours a day in December to about 14.7 hours in June, computed from the park's latitude.
Weather at nearby parks
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Keep exploring
Sources: NOAA NCEI U.S. Climate Normals 1991–2020 (station USC00189140), daylight computed from latitude, weather description from the National Park Service, crowd levels from National Park Service Visitor Use Statistics (2023–2025). Updated 2026-10-11. Lodging results are provided by Stay22; WhenToVisitParks may earn a commission from bookings, at no extra cost to you.