Updated October 2026
Lake Roosevelt National Recreation Area Weather by Month
Lake Roosevelt National Recreation Area is warmest in August, when the nearest NOAA climate station averages a high of 86°F and a low of 47°F, and coldest in January, with an average high of 33°F and an average low of 20°F. November is the wettest month, with about 2.4 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, 29 miles from the park's reference point. A single station cannot describe a whole park: temperatures elsewhere in Lake Roosevelt National Recreation Area can differ from these, particularly with elevation.
Warmest month
Aug
86°F avg high
Coldest month
Jan
20°F avg low
Wettest month
Nov
2.4 in avg
Longest days
Jun
15.8 h of daylight
Average weather at Lake Roosevelt by month
| Month | Avg high | Avg low | Precipitation | Daylight |
|---|---|---|---|---|
| January | 33°F | 20°F | 2.2 in | 8.6 h |
| February | 40°F | 21°F | 1.9 in | 10.0 h |
| March | 50°F | 27°F | 2.2 in | 11.6 h |
| April | 60°F | 33°F | 1.9 in | 13.4 h |
| May | 70°F | 40°F | 2.0 in | 15.0 h |
| June | 76°F | 46°F | 2.1 in | 15.8 h |
| July | 86°F | 49°F | 1.0 in | 15.5 h |
| August | 86°F | 47°F | 0.7 in | 14.1 h |
| September | 76°F | 39°F | 1.0 in | 12.3 h |
| October | 59°F | 31°F | 1.8 in | 10.5 h |
| November | 42°F | 26°F | 2.4 in | 9.0 h |
| December | 33°F | 21°F | 2.3 in | 8.2 h |
| Year total | 21.5 in |
NOAA 1991–2020 climate normals from station USC00451395, 29 miles from the park's reference point. Daylight is the monthly average, computed from the park's latitude. Each month links to how crowded Lake Roosevelt is at that time of year.
Lake Roosevelt weather by season
Winter: December to February
Average highs climb from 33°F in December to 40°F in February, with average lows near 21°F. The average low is at or below freezing in all three months. Together the three months average 6.4 inches of precipitation, about 30% of the yearly total and more than in any other season. Daylight is at its shortest, about 8.2 hours in December.
Spring: March to May
Average highs climb from 50°F in March to 70°F in May, with average lows between 27°F and 40°F. The average low is at or below freezing in March. Together the three months average 6.1 inches of precipitation, about 28% of the yearly total. Daylight lengthens from about 11.6 hours in March to 15.0 in May.
Summer: June to August
Average highs climb from 76°F in June to 86°F in August, with average lows between 46°F and 49°F. Together the three months average 3.8 inches of precipitation, about 18% of the yearly total and less than in any other season. Daylight is at its longest, about 15.8 hours in June.
Fall: September to November
Average highs fall from 76°F in September to 42°F in November, with average lows between 26°F and 39°F. The average low is at or below freezing in October and November. Together the three months average 5.2 inches of precipitation, about 24% of the yearly total. Daylight shortens from about 12.3 hours in September to 9.0 in November.
What the National Park Service says about the weather
Lake Roosevelt is generally a cool or cold place from fall through spring with overcast skies. In the summer, the skies clear and present warm to hot days. More information on weather can be found under Alerts and Conditions.
Weather description courtesy of the National Park Service — official park site.
Today's forecast for Lake Roosevelt
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 48.17°N, 118.35°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 Lake Roosevelt National Recreation Area →
Weather and crowds together
August, the warmest month, sees about 2.1× the visitors of the park's average month. July is the busiest month of the year and December the quietest. To see those crowds set against the weather for all twelve months, read the best time to visit Lake Roosevelt National Recreation Area. For hotels, cabins and rentals close to the park, see where to stay near Lake Roosevelt.
Where to stay near Lake Roosevelt
Picked a month for Lake Roosevelt National Recreation Area? Compare hotels, cabins and vacation rentals near the park with live availability and prices.
Top-rated places to stay near Lake Roosevelt
Prices for Oct 16–18, 4 adults. Change dates on the map below.
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Frequently Asked Questions
August is the warmest month at Lake Roosevelt National Recreation Area, with an average high of 86°F and an average low of 47°F. That is the 1991–2020 average at the nearest long-record NOAA station, 29 miles from the park's reference point. Temperatures inside the park can differ, particularly with elevation.
January is the coldest month at Lake Roosevelt National Recreation Area, with an average low of 20°F and an average high of 33°F, based on NOAA 1991–2020 climate normals.
November is the wettest month, with about 2.4 inches of precipitation. August is the driest, at about 0.7 inches. The station records about 21.5 inches of precipitation in an average year.
Daylight at Lake Roosevelt National Recreation Area runs from about 8.2 hours a day in December to about 15.8 hours in June, computed from the park's latitude.
Weather at nearby parks
Keep exploring
Sources: NOAA NCEI U.S. Climate Normals 1991–2020 (station USC00451395), 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.