Updated October 2026
Grant-Kohrs Ranch National Historic Site Weather by Month
Grant-Kohrs Ranch National Historic Site is warmest in August, when the nearest NOAA climate station averages a high of 79°F and a low of 42°F, and coldest in December, with an average high of 31°F and an average low of 11°F. June is the wettest month, with about 2.7 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, 2.9 miles from the park's reference point. A single station cannot describe a whole park: temperatures elsewhere in Grant-Kohrs Ranch National Historic Site can differ from these, particularly with elevation.
Warmest month
Aug
79°F avg high
Coldest month
Dec
11°F avg low
Wettest month
Jun
2.7 in avg
Longest days
Jun
15.6 h of daylight
Average weather at Grant-Kohrs Ranch by month
| Month | Avg high | Avg low | Precipitation | Daylight |
|---|---|---|---|---|
| January | 33°F | 11°F | 0.5 in | 8.8 h |
| February | 36°F | 13°F | 0.7 in | 10.1 h |
| March | 44°F | 19°F | 1.3 in | 11.6 h |
| April | 53°F | 26°F | 1.1 in | 13.3 h |
| May | 62°F | 34°F | 2.2 in | 14.8 h |
| June | 69°F | 40°F | 2.7 in | 15.6 h |
| July | 79°F | 44°F | 1.5 in | 15.3 h |
| August | 79°F | 42°F | 1.3 in | 14.0 h |
| September | 70°F | 35°F | 1.4 in | 12.3 h |
| October | 55°F | 26°F | 1.0 in | 10.6 h |
| November | 40°F | 16°F | 0.5 in | 9.1 h |
| December | 31°F | 11°F | 0.5 in | 8.4 h |
| Year total | 14.7 in |
NOAA 1991–2020 climate normals from station USC00242275, 2.9 miles from the park's reference point. Daylight is the monthly average, computed from the park's latitude. Each month links to how crowded Grant-Kohrs Ranch is at that time of year.
Grant-Kohrs Ranch weather by season
Winter: December to February
Average highs climb from 31°F in December to 36°F in February, with average lows near 12°F. The average low is at or below freezing in all three months. Together the three months average 1.7 inches of precipitation, about 12% of the yearly total and less than in any other season. Daylight is at its shortest, about 8.4 hours in December.
Spring: March to May
Average highs climb from 44°F in March to 62°F in May, with average lows between 19°F and 34°F. The average low is at or below freezing in March and April. Together the three months average 4.6 inches of precipitation, about 31% of the yearly total. Daylight lengthens from about 11.6 hours in March to 14.8 in May.
Summer: June to August
Average highs climb from 69°F in June to 79°F in August, with average lows between 40°F and 44°F. Together the three months average 5.5 inches of precipitation, about 37% of the yearly total and more than in any other season. Daylight is at its longest, about 15.6 hours in June.
Fall: September to November
Average highs fall from 70°F in September to 40°F in November, with average lows between 16°F and 35°F. The average low is at or below freezing in October and November. Together the three months average 2.9 inches of precipitation, about 20% of the yearly total. Daylight shortens from about 12.3 hours in September to 9.1 in November.
What the National Park Service says about the weather
Spring: Temperatures can fluctuate greatly. Sub-freezing temperatures in the morning can give way to mild days. Snow in early spring, rain in late season. Summer: Temperatures can average 70-80 F, but can reach highs of 100 F. Rain rare. Dry and hot. Fall: Temperatures can fluctuate greatly. Sub-freezing mornings can give way to mild days. Rain in early fall likely. Winter: Temperature can fall to -30 F, with highs of 10-20 F. Snow is possible. Cold weather gear is highly recommended.
Weather description courtesy of the National Park Service — official park site.
Today's forecast for Grant-Kohrs Ranch
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 46.41°N, 112.75°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 Grant-Kohrs Ranch National Historic Site →
Weather and crowds together
August, the warmest month, sees about 2.0× the visitors of the park's average month. July is the busiest month of the year and February the quietest. To see those crowds set against the weather for all twelve months, read the best time to visit Grant-Kohrs Ranch National Historic Site. For hotels, cabins and rentals close to the park, see where to stay near Grant-Kohrs Ranch.
Where to stay near Grant-Kohrs Ranch
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Frequently Asked Questions
August is the warmest month at Grant-Kohrs Ranch National Historic Site, with an average high of 79°F and an average low of 42°F. That is the 1991–2020 average at the nearest long-record NOAA station, 2.9 miles from the park's reference point. Temperatures inside the park can differ, particularly with elevation.
December is the coldest month at Grant-Kohrs Ranch National Historic Site, with an average low of 11°F and an average high of 31°F, based on NOAA 1991–2020 climate normals.
June is the wettest month, with about 2.7 inches of precipitation. January, November and December are the driest, at about 0.5 inches each. The station records about 14.7 inches of precipitation in an average year.
Daylight at Grant-Kohrs Ranch National Historic Site runs from about 8.4 hours a day in December to about 15.6 hours in June, computed from the park's latitude.
Weather at nearby parks
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Sources: NOAA NCEI U.S. Climate Normals 1991–2020 (station USC00242275), 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.