Updated October 2026
Florissant Fossil Beds National Monument Weather by Month
Florissant Fossil Beds National Monument is warmest in July, 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 39°F and an average low of 5°F. August is the wettest month, with about 3 inches of precipitation. Snowfall is heaviest in March, at about 12 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, 0.3 miles from the park's reference point. A single station cannot describe a whole park: temperatures elsewhere in Florissant Fossil Beds National Monument can differ from these, particularly with elevation.
Warmest month
Jul
79°F avg high
Coldest month
Dec
5°F avg low
Wettest month
Aug
3.0 in avg
Snowiest month
Mar
11.7 in avg
Longest days
Jun
14.7 h of daylight
Average weather at Florissant Fossil Beds by month
| Month | Avg high | Avg low | Precipitation | Snowfall | Daylight |
|---|---|---|---|---|---|
| January | 39°F | 5°F | 0.5 in | 7.0 in | 9.6 h |
| February | 41°F | 8°F | 0.4 in | 7.7 in | 10.5 h |
| March | 49°F | 15°F | 0.9 in | 11.7 in | 11.7 h |
| April | 56°F | 21°F | 1.1 in | 9.4 in | 13.0 h |
| May | 65°F | 29°F | 1.6 in | 3.8 in | 14.1 h |
| June | 75°F | 37°F | 1.6 in | 0.1 in | 14.7 h |
| July | 79°F | 42°F | 2.9 in | 0.0 in | 14.5 h |
| August | 76°F | 41°F | 3.0 in | 0.0 in | 13.5 h |
| September | 71°F | 33°F | 1.3 in | 0.7 in | 12.2 h |
| October | 60°F | 23°F | 0.7 in | 4.4 in | 11.0 h |
| November | 48°F | 14°F | 0.5 in | 7.3 in | 9.8 h |
| December | 39°F | 5°F | 0.4 in | 6.8 in | 9.3 h |
| Year total | 14.9 in | 58.9 in |
NOAA 1991–2020 climate normals from station USC00052965, 0.3 miles from the park's reference point. Daylight is the monthly average, computed from the park's latitude. Each month links to how crowded Florissant Fossil Beds is at that time of year.
Florissant Fossil Beds weather by season
Winter: December to February
Average highs hold near 40°F in all three months, with average lows between 5°F and 8°F. The average low is at or below freezing in all three months. Together the three months average 1.3 inches of precipitation, about 9% of the yearly total and less than in any other season. Snowfall averages about 22 inches for the season. Daylight is at its shortest, about 9.3 hours in December.
Spring: March to May
Average highs climb from 49°F in March to 65°F in May, with average lows between 15°F and 29°F. The average low is at or below freezing in all three months. Together the three months average 3.6 inches of precipitation, about 24% of the yearly total. Snowfall averages about 25 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 79°F in July, between 75°F in June and 76°F in August, with average lows between 37°F and 42°F. Together the three months average 7.5 inches of precipitation, about 50% of the yearly total and more than in any other season. Snowfall averages about 0.1 inches for the season. Daylight is at its longest, about 14.7 hours in June.
Fall: September to November
Average highs fall from 71°F in September to 48°F in November, with average lows between 14°F and 33°F. The average low is at or below freezing in October and November. Together the three months average 2.5 inches of precipitation, about 17% of the yearly total. Snowfall averages about 12 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
Winter months - average high 40 degrees F; average low 5 degrees F; Summer months - average high 75 degrees F; average low 40 degrees F;
Weather description courtesy of the National Park Service — official park site.
Today's forecast for Florissant 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 38.91°N, 105.28°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 Florissant Fossil Beds National Monument →
Weather and crowds together
July is both the warmest month and the busiest, with about 2.2× 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 Florissant Fossil Beds National Monument. For hotels, cabins and rentals close to the park, see where to stay near Florissant Fossil Beds.
Where to stay near Florissant Fossil Beds
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Frequently Asked Questions
July is the warmest month at Florissant Fossil Beds National Monument, 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, 0.3 miles from the park's reference point. Temperatures inside the park can differ, particularly with elevation.
December is the coldest month at Florissant Fossil Beds National Monument, with an average low of 5°F and an average high of 39°F, based on NOAA 1991–2020 climate normals.
August is the wettest month, with about 3 inches of precipitation. February and December are the driest, at about 0.4 inches each. The station records about 14.9 inches of precipitation in an average year.
Yes. The nearest long-record NOAA station, 0.3 miles from the park's reference point, averages about 59 inches of snow a year. March is the snowiest month, at about 12 inches. The station averages at least a tenth of an inch of snow in 10 of the 12 months.
Weather at nearby parks
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Keep exploring
Sources: NOAA NCEI U.S. Climate Normals 1991–2020 (station USC00052965), 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.