Shannon Farm · Photo: Jeffrey Beall · CC BY-SA 3.0Lafayette’s winters are colder and snowier than most of the U.S.
A typical July afternoon reaches 89°, a January night drops to 19°, and about 65 inches of snow falls in a normal winter.
A year in Lafayette at a glance
Each month’s typical high and low, and what it brings.
What stands out about Lafayette’s climate
Compared with towns across the U.S., with Lafayette’s place in Colorado beside it.
What a year in Lafayette feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 151 frost-free days a year
In half of years the last 32° night comes by May 6 and the first by October 5. Frost and day counts come from NOAA’s station at Boulder, CO, 9 miles from the town’s center, 250 ft higher.
The 2023 USDA map puts Lafayette’s center in zone 6a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −8°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 65 inches of snow a winter
Snow, measured at Lafayette 0.4 Wsw, CO, falls mostly in February and December. Precipitation (rain plus melted snow) adds up to 17 inches a year; May is the wettest month and December the driest. Rain or snow falls on about 85 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Lafayette
90% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October through April.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Boulder, CO.
Living with Lafayette’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
151 frost-free days in zone 6a. The last frost comes by May 6 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Oct 5.
Months with highs of 62–84° and lows of 40° or more: May, June and September. 33 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Lafayette from natural hazards, river flooding is the largest share (43%); heat waves, cold waves, winter storms and ice storms together are 9%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Lafayette and its neighbors
Leyner has the coldest January nights next door (17°, 1° colder). Differences under a degree are within what the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Lafayette’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 |
|---|---|---|---|---|
| Lafayette, CO | 19° | 89° | 17" | 65" |
| Mapleton, UT | 18° | 91° | 17" | 66" |
| Pocatello, ID | 19° | 87° | 15" | 64" |
| Chadron, NE | 14° | 89° | 18" | 50" |
| Billings, MT | 15° | 89° | 14" | 48" |
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
Warmer than it used to be
The last 30 years in Lafayette averaged 1.4° warmer than the 1900s. The biggest change is in March (+3.3°).
A bigger shift than in 54% 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 Lafayette compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Lafayette’s place among Colorado’s.
Lafayette weather by month
Highs, lows and precipitation from NOAA’s grid at Lafayette’s center; snow, wet days and snow on the ground from Lafayette 0.4 Wsw, CO. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 46° | 19° | 0.6" | 7.7" | 4 | 12 | 24° – 39° |
| February | 48° | 21° | 0.8" | 12.0" | 6 | 12 | 28° – 41° |
| March | 56° | 28° | 1.4" | 10.2" | 6 | 6 | 36° – 49° |
| April | 62° | 34° | 2.3" | 9.1" | 9 | 3 | 42° – 54° |
| May | 72° | 43° | 2.7" | 2.4" | 11 | 1 | 51° – 61° |
| June | 83° | 52° | 1.8" | 0.0" | 8 | 0 | 63° – 73° |
| July | 89° | 58° | 1.7" | 0.0" | 9 | 0 | 69° – 77° |
| August | 87° | 56° | 1.6" | 0.0" | 9 | 0 | 67° – 75° |
| September | 79° | 48° | 1.3" | 0.0" | 7 | 0 | 58° – 67° |
| October | 66° | 36° | 1.2" | 5.2" | 7 | 2 | 43° – 57° |
| November | 54° | 26° | 0.9" | 6.9" | 5 | 5 | 31° – 47° |
| December | 46° | 19° | 0.6" | 11.5" | 5 | 14 | 25° – 36° |
| Year | 66° | 36° | 16.9" | 65.0" | 85 | 57 |
How much a month can swing
A normal is an average. November swings the most: from 1991 to 2020 its average ranged from 31° to 47°. August is the most reliable, staying within 8°.
Where Lafayette’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 Lafayette’s center.
- Snow: Lafayette 0.4 Wsw, CO (NOAA station in town).
- Frost, freezing nights, 90° and 100° days, heating and cooling: Boulder, CO, 9 miles from the town’s center, 250 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 Lafayette’s climate
What is the weather like in Lafayette?
A typical July afternoon reaches 89°, a January night drops to 19°, and about 65 inches of snow falls in a normal winter. Colder January nights than 67% of U.S. towns; hotter July afternoons than 73% of U.S. towns.
How cold does it get in Lafayette in winter?
January nights average 19°. About 138 nights a year reach 32° or below and 4 reach 0° or below. In the coldest January of the last 30 years the month averaged 24°.
How much snow does Lafayette get?
About 65 inches in a normal winter at Lafayette 0.4 Wsw, CO, most of it in February and December, with snow on the ground about 57 days a year.
How hot does it get in Lafayette?
July, with a typical high of 89° and a low of 58°. About 33 days a year reach 90° (Boulder, CO).
When is the first and last frost in Lafayette?
In half of years the last spring frost (32°) comes by May 6 and the first fall frost by October 5, about 151 frost-free days, at Boulder, CO.
What growing zone is Lafayette in?
Zone 6a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −8°.
What is the best time of year to visit Lafayette?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Lafayette getting warmer?
Yes: 1991–2020 averaged 1.4° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 54% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Lafayette.
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.