Hornbek House · Photo: Fredlyfish4 · CC BY-SA 3.0Florissant has some of the coldest winter nights among U.S. towns
Expect July afternoons of about 78°. Winter and summer sit 71° apart. Its July afternoons stay fresher than in 96% of U.S. towns. The heating season runs October to May: each of those months averages under 50°.
A year in Florissant at a glance
Each month’s typical high and low, and what it brings.
What stands out about Florissant’s climate
Compared with towns across the U.S., with Florissant’s place in Colorado beside it.
What a year in Florissant feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
A freeze is possible in every month
About 250 nights a year fall to 32° or below, and 33 to 0° or below. Frost and day counts come from NOAA’s station at Florissant Fossil Bed, CO, 2.2 miles from the town’s center, 120 ft higher.
The 2023 USDA map puts Florissant’s center in zone 4b: the coldest night of a typical winter, averaged over 1991–2020, reaches about −24°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
About 59 inches of snow a winter
Snow, measured at Florissant Fossil Bed, CO, falls mostly in March. Precipitation (rain plus melted snow) adds up to 15 inches a year; July is the wettest month and December the driest. Rain or snow falls on about 84 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Florissant
Nearly all of the work is heating: a normal year has almost no cooling days. Months averaging under 55° run from September through May.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Florissant Fossil Bed, CO.
Living with Florissant’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
Zone 4b, and frost can come in any month. The longest frost-free stretch in half of years is about 68 days.
Months with highs of 62–84° and lows of 40° or more: July and August. 0.6 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Florissant from natural hazards, wildfire is the largest share (69%); heat waves, cold waves, winter storms and ice storms together are 2%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Florissant and similar climates
TownRatings has no climate map of the towns around Florissant yet.
Climates most like Florissant’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Florissant, CO | 7° | 78° | 15" | 59" |
| Jackson, WY | 6° | 80° | 19" | 78" |
| Minot, ND | 2° | 82° | 17" | 52" |
| Thief River Falls, MN | −4° | 79° | 22" | 50" |
| Watertown, SD | 2° | 81° | 25" | 41" |
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
Warmer than it used to be
The last 30 years in Florissant averaged 0.9° warmer than the 1900s. The biggest change is in March (+2.7°).
A smaller shift than in 86% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Florissant compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Florissant’s place among Colorado’s.
Florissant weather by month
Highs, lows and precipitation from NOAA’s grid at Florissant’s center; snow, wet days and snow on the ground from Florissant Fossil Bed, CO. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | 30-yr range |
|---|---|---|---|---|---|---|
| January | 38° | 7° | 0.6" | 7.0" | 4 | 15° – 30° |
| February | 40° | 9° | 0.6" | 7.7" | 5 | 18° – 32° |
| March | 47° | 17° | 1.0" | 11.7" | 6 | 28° – 38° |
| April | 52° | 24° | 1.5" | 9.4" | 6 | 33° – 43° |
| May | 62° | 32° | 1.7" | 3.8" | 9 | 42° – 51° |
| June | 74° | 40° | 1.4" | 0.1" | 8 | 52° – 61° |
| July | 78° | 46° | 2.8" | 0.0" | 13 | 58° – 64° |
| August | 75° | 44° | 2.5" | 0.0" | 14 | 56° – 64° |
| September | 69° | 36° | 1.4" | 0.7" | 7 | 48° – 57° |
| October | 58° | 26° | 0.8" | 4.4" | 5 | 36° – 47° |
| November | 47° | 16° | 0.6" | 7.3" | 4 | 23° – 38° |
| December | 38° | 7° | 0.5" | 6.8" | 4 | 16° – 29° |
| Year | 57° | 25° | 15.3" | 58.9" | 84 |
How much a month can swing
A normal is an average. November swings the most: from 1991 to 2020 its average ranged from 23° to 38°. July is the most reliable, staying within 6°.
Where Florissant’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Florissant’s center.
- Snow: Florissant Fossil Bed, CO.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Florissant Fossil Bed, CO, 2.2 miles from the town’s center, 120 ft higher; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Florissant’s climate
What is the weather like in Florissant?
A typical July afternoon reaches 78°, a January night drops to 7°, and about 59 inches of snow falls in a normal winter. Colder January nights than 97% of U.S. towns; cooler July afternoons than 96% of U.S. towns.
How cold does it get in Florissant in winter?
January nights average 7°. About 250 nights a year reach 32° or below and 33 reach 0° or below. In the coldest January of the last 30 years the month averaged 15°.
How much snow does Florissant get?
About 59 inches in a normal winter at Florissant Fossil Bed, CO, most of it in March.
How hot does it get in Florissant?
July, with a typical high of 78°. 90° days are rare: none in a normal year at Florissant Fossil Bed, CO.
When is the first and last frost in Florissant?
There is no reliable frost-free season: at Florissant Fossil Bed, CO, every month has nights at 32° or below, about 250 a year. In half of years the longest stretch without a freeze is about 68 days.
What growing zone is Florissant in?
Zone 4b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −24°.
What is the best time of year to visit Florissant?
By one simple rule (highs of 62–84° and lows of 40° or more), July and August. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Florissant getting warmer?
Yes: 1991–2020 averaged 0.9° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 86% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Florissant.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.