Updated October 2026
George Rogers Clark National Historical Park Weather by Month
George Rogers Clark National Historical Park is warmest in July, when the nearest NOAA climate station averages a high of 89°F and a low of 66°F, and coldest in January, with an average high of 40°F and an average low of 22°F. May is the wettest month, with about 5.5 inches of precipitation. Snowfall is heaviest in December, at about 3 inches.
These figures are NOAA's 1991–2020 climate normals, the 30-year average for each calendar month, from the nearest long-record weather station, 4.8 miles from the park's reference point. A single station cannot describe a whole park: temperatures elsewhere in George Rogers Clark National Historical Park can differ from these, particularly with elevation.
Warmest month
Jul
89°F avg high
Coldest month
Jan
22°F avg low
Wettest month
May
5.5 in avg
Snowiest month
Dec
3.0 in avg
Longest days
Jun
14.7 h of daylight
Average weather at George Rogers Clark by month
| Month | Avg high | Avg low | Precipitation | Snowfall | Daylight |
|---|---|---|---|---|---|
| January | 40°F | 22°F | 3.0 in | 2.7 in | 9.6 h |
| February | 45°F | 24°F | 2.5 in | 2.1 in | 10.5 h |
| March | 55°F | 33°F | 3.6 in | 0.5 in | 11.7 h |
| April | 67°F | 44°F | 4.9 in | 0.0 in | 13.0 h |
| May | 77°F | 55°F | 5.5 in | 0.0 in | 14.1 h |
| June | 86°F | 64°F | 4.8 in | 0.0 in | 14.7 h |
| July | 89°F | 66°F | 4.6 in | 0.0 in | 14.5 h |
| August | 88°F | 64°F | 3.3 in | 0.0 in | 13.5 h |
| September | 82°F | 57°F | 3.6 in | 0.0 in | 12.2 h |
| October | 70°F | 45°F | 3.6 in | 0.0 in | 11.0 h |
| November | 56°F | 35°F | 4.0 in | 0.2 in | 9.8 h |
| December | 44°F | 26°F | 3.4 in | 3.0 in | 9.3 h |
| Year total | 46.8 in | 8.5 in |
NOAA 1991–2020 climate normals from station USC00129113, 4.8 miles from the park's reference point. Daylight is the monthly average, computed from the park's latitude. Each month links to how crowded George Rogers Clark is at that time of year.
George Rogers Clark weather by season
Winter: December to February
Average highs bottom out at 40°F in January, between 44°F in December and 45°F in February, with average lows between 22°F and 26°F. The average low is at or below freezing in all three months. Together the three months average 8.9 inches of precipitation, about 19% of the yearly total and less than in any other season. Snowfall averages about 7.8 inches for the season. Daylight is at its shortest, about 9.3 hours in December.
Spring: March to May
Average highs climb from 55°F in March to 77°F in May, with average lows between 33°F and 55°F. Together the three months average 14 inches of precipitation, about 30% of the yearly total and more than in any other season. Snowfall averages about 0.5 inches for the season. Daylight lengthens from about 11.7 hours in March to 14.1 in May.
Summer: June to August
Average highs peak at 89°F in July, between 86°F in June and 88°F in August, with average lows near 65°F. Together the three months average 12.7 inches of precipitation, about 27% of the yearly total. Daylight is at its longest, about 14.7 hours in June.
Fall: September to November
Average highs fall from 82°F in September to 56°F in November, with average lows between 35°F and 57°F. Together the three months average 11.2 inches of precipitation, about 24% of the yearly total. Snowfall averages about 0.2 inches for the season. Daylight shortens from about 12.2 hours in September to 9.8 in November.
What the National Park Service says about the weather
The weather in the area is quite typical for the Midwest. The average temperature for the winter months is in the mid 30s, but the summers can often be hot and humid with temperatures reaching into the 90s.
Weather description courtesy of the National Park Service — official park site.
Today's forecast for George Rogers Clark
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 38.68°N, 87.54°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 George Rogers Clark National Historical Park →
Weather and crowds together
July, the warmest month, sees about 2.3× the visitors of the park's average month. May is the busiest month of the year and January the quietest. To see those crowds set against the weather for all twelve months, read the best time to visit George Rogers Clark National Historical Park. For hotels, cabins and rentals close to the park, see where to stay near George Rogers Clark.
Where to stay near George Rogers Clark
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Top-rated places to stay near George Rogers Clark
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Frequently Asked Questions
July is the warmest month at George Rogers Clark National Historical Park, with an average high of 89°F and an average low of 66°F. That is the 1991–2020 average at the nearest long-record NOAA station, 4.8 miles from the park's reference point. Temperatures inside the park can differ, particularly with elevation.
January is the coldest month at George Rogers Clark National Historical Park, with an average low of 22°F and an average high of 40°F, based on NOAA 1991–2020 climate normals.
May is the wettest month, with about 5.5 inches of precipitation. February is the driest, at about 2.5 inches. The station records about 46.8 inches of precipitation in an average year.
Yes. The nearest long-record NOAA station, 4.8 miles from the park's reference point, averages about 8.5 inches of snow a year. December is the snowiest month, at about 3 inches. The station averages at least a tenth of an inch of snow in 5 of the 12 months.
Weather at nearby parks
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Keep exploring
Sources: NOAA NCEI U.S. Climate Normals 1991–2020 (station USC00129113), 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.