Photo: Jeffrey Beall · CC BY-SA 3.0Johnstown’s winters are colder and snowier than most of the U.S.
A typical July afternoon reaches 90°, a January night drops to 15°, and about 47 inches of snow falls in a normal winter.
A year in Johnstown at a glance
Each month’s typical high and low, and what it brings.
What stands out about Johnstown’s climate
Compared with towns across the U.S., with Johnstown’s place in Colorado beside it.
What a year in Johnstown feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 142 frost-free days a year
In half of years the last 32° night comes by May 10 and the first by October 1. Frost and day counts come from NOAA’s station at Loveland 2n, CO, 13 miles from the town’s center, 160 ft higher.
The 2023 USDA map puts Johnstown’s center in zone 5b: the coldest night of a typical winter, averaged over 1991–2020, reaches about −13°. 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 47 inches of snow a winter
Snow, measured at Loveland 2n, CO, falls mostly in February, March and December. Precipitation (rain plus melted snow) adds up to 14 inches a year; May is the wettest month and January the driest. Rain or snow falls on about 94 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Johnstown
92% 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 Loveland 2n, CO.
Living with Johnstown’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
142 frost-free days in zone 5b. The last frost comes by May 10 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 1.
Months with highs of 62–84° and lows of 40° or more: May and September. 20 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Johnstown from natural hazards, river flooding is the largest share (44%); heat waves, cold waves, winter storms and ice storms together are 22%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Johnstown and its neighbors
Every town next door is within a degree of Johnstown in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Johnstown’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 |
|---|---|---|---|---|
| Johnstown, CO | 15° | 90° | 14" | 47" |
| Hyde Park, UT | 14° | 89° | 16" | 44" |
| Preston, ID | 14° | 89° | 15" | 52" |
| Spring Creek, NV | 15° | 89° | 14" | 41" |
| 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 Johnstown averaged 1.7° warmer than the 1900s. The biggest change is in March (+3.5°).
A bigger shift than in 73% 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 Johnstown compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Johnstown’s place among Colorado’s.
Johnstown weather by month
Highs, lows and precipitation from NOAA’s grid at Johnstown’s center; snow, wet days and snow on the ground from Loveland 2n, CO. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 44° | 15° | 0.4" | 6.0" | 5 | 13 | 20° – 36° |
| February | 47° | 19° | 0.4" | 8.2" | 7 | 10 | 27° – 40° |
| March | 57° | 26° | 0.9" | 7.9" | 7 | 4 | 35° – 48° |
| April | 64° | 33° | 1.8" | 5.7" | 10 | 2 | 42° – 54° |
| May | 73° | 43° | 2.5" | 1.1" | 13 | 0 | 52° – 62° |
| June | 84° | 52° | 1.7" | 0.0" | 10 | 0 | 64° – 74° |
| July | 90° | 58° | 1.5" | 0.0" | 9 | 0 | 70° – 78° |
| August | 88° | 56° | 1.6" | 0.0" | 9 | 0 | 68° – 76° |
| September | 80° | 47° | 1.2" | 0.0" | 8 | 0 | 59° – 68° |
| October | 66° | 35° | 1.0" | 3.5" | 6 | 2 | 43° – 56° |
| November | 53° | 24° | 0.6" | 7.0" | 6 | 5 | 30° – 45° |
| December | 43° | 15° | 0.4" | 7.6" | 5 | 12 | 22° – 35° |
| Year | 66° | 35° | 13.9" | 47.0" | 94 | 49 |
How much a month can swing
A normal is an average. January swings the most: from 1991 to 2020 its average ranged from 20° to 36°. August is the most reliable, staying within 8°.
Where Johnstown’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 Johnstown’s center.
- Snow: Loveland 2n, CO.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Loveland 2n, CO, 13 miles from the town’s center, 160 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 Johnstown’s climate
What is the weather like in Johnstown?
A typical July afternoon reaches 90°, a January night drops to 15°, and about 47 inches of snow falls in a normal winter. Colder January nights than 83% of U.S. towns; hotter July afternoons than 78% of U.S. towns.
How cold does it get in Johnstown in winter?
December nights average 15°. About 174 nights a year reach 32° or below and 10 reach 0° or below. In the coldest December of the last 30 years the month averaged 22°.
How much snow does Johnstown get?
About 47 inches in a normal winter at Loveland 2n, CO, most of it in February, March and December, with snow on the ground about 49 days a year.
How hot does it get in Johnstown?
July, with a typical high of 90° and a low of 58°. About 38 days a year reach 90° and 2 reach 100° (Loveland 2n, CO).
When is the first and last frost in Johnstown?
In half of years the last spring frost (32°) comes by May 10 and the first fall frost by October 1, about 142 frost-free days, at Loveland 2n, CO.
What growing zone is Johnstown in?
Zone 5b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −13°.
What is the best time of year to visit Johnstown?
By one simple rule (highs of 62–84° and lows of 40° or more), May and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Johnstown getting warmer?
Yes: 1991–2020 averaged 1.7° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 73% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Johnstown.
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.