Updated October 2026
Hagerman Fossil Beds National Monument Weather by Month
Hagerman Fossil Beds National Monument is warmest in July, when the nearest NOAA climate station averages a high of 92°F and a low of 56°F, and coldest in January, with an average high of 38°F and an average low of 22°F. December is the wettest month, with about 1.6 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, 1.8 miles from the park's reference point. A single station cannot describe a whole park: temperatures elsewhere in Hagerman Fossil Beds National Monument can differ from these, particularly with elevation.
Warmest month
Jul
92°F avg high
Coldest month
Jan
22°F avg low
Wettest month
Dec
1.6 in avg
Longest days
Jun
15.1 h of daylight
Average weather at Hagerman Fossil Beds by month
| Month | Avg high | Avg low | Precipitation | Daylight |
|---|---|---|---|---|
| January | 38°F | 22°F | 1.3 in | 9.2 h |
| February | 45°F | 25°F | 0.9 in | 10.3 h |
| March | 55°F | 31°F | 1.0 in | 11.7 h |
| April | 62°F | 35°F | 0.8 in | 13.2 h |
| May | 72°F | 44°F | 1.0 in | 14.4 h |
| June | 82°F | 50°F | 0.6 in | 15.1 h |
| July | 92°F | 56°F | 0.2 in | 14.9 h |
| August | 91°F | 53°F | 0.2 in | 13.8 h |
| September | 81°F | 44°F | 0.4 in | 12.3 h |
| October | 66°F | 35°F | 0.7 in | 10.8 h |
| November | 50°F | 27°F | 1.1 in | 9.5 h |
| December | 38°F | 22°F | 1.6 in | 8.9 h |
| Year total | 9.8 in |
NOAA 1991–2020 climate normals from station USC00103932, 1.8 miles from the park's reference point. Daylight is the monthly average, computed from the park's latitude. Each month links to how crowded Hagerman Fossil Beds is at that time of year.
Hagerman Fossil Beds weather by season
Winter: December to February
Average highs climb from 38°F in December to 45°F in February, with average lows between 22°F and 25°F. The average low is at or below freezing in all three months. Together the three months average 3.8 inches of precipitation, about 39% of the yearly total and more than in any other season. Daylight is at its shortest, about 8.9 hours in December.
Spring: March to May
Average highs climb from 55°F in March to 72°F in May, with average lows between 31°F and 44°F. The average low is at or below freezing in March. Together the three months average 2.8 inches of precipitation, about 29% 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 92°F in July, between 82°F in June and 91°F in August, with average lows between 50°F and 56°F. The average high is 90°F or hotter in July and August. Together the three months average 1 inch of precipitation, about 10% 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 81°F in September to 50°F in November, with average lows between 27°F and 44°F. The average low is at or below freezing in November. Together the three months average 2.2 inches of precipitation, about 22% of the yearly total. Daylight shortens from about 12.3 hours in September to 9.5 in November.
What the National Park Service says about the weather
Hagerman, Idaho, gets 10 inches of rain per year. On average, there are 213 sunny days per year in Hagerman, Idaho. The July high is around 94 degrees. The January low is 22. Our comfort index, which is based on humidity during the hot months, is a 78 out of 100, where higher is more comfortable. The US average on the comfort index is 44.
Weather description courtesy of the National Park Service — official park site.
Today's forecast for Hagerman Fossil Beds
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 42.79°N, 114.94°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 Hagerman Fossil Beds National Monument →
Weather and crowds together
July is both the warmest month and the busiest, with about 2.3× 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 Hagerman Fossil Beds National Monument. For hotels, cabins and rentals close to the park, see where to stay near Hagerman Fossil Beds.
Where to stay near Hagerman Fossil Beds
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Frequently Asked Questions
July is the warmest month at Hagerman Fossil Beds National Monument, with an average high of 92°F and an average low of 56°F. That is the 1991–2020 average at the nearest long-record NOAA station, 1.8 miles from the park's reference point. Temperatures inside the park can differ, particularly with elevation.
January is the coldest month at Hagerman Fossil Beds National Monument, with an average low of 22°F and an average high of 38°F, based on NOAA 1991–2020 climate normals.
December is the wettest month, with about 1.6 inches of precipitation. July and August are the driest, at about 0.2 inches each. The station records about 9.8 inches of precipitation in an average year.
Daylight at Hagerman Fossil Beds National Monument 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
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Sources: NOAA NCEI U.S. Climate Normals 1991–2020 (station USC00103932), daylight computed from latitude, weather description from the National Park Service, crowd levels from National Park Service Visitor Use Statistics (1995–2025). Updated 2026-10-11. Lodging results are provided by Stay22; WhenToVisitParks may earn a commission from bookings, at no extra cost to you.