Photo: Jeffrey Beall · CC BY 4.0Less rain and snow falls on Commerce City than on 94% of U.S. towns: 14 inches a year
The warmest part of a July day comes in at 90° on average. Its July heat outdoes that of 77% of U.S. towns. The latest 30-year average runs 1.6° warmer than 1901–2000’s, with March up the most. Tender plants can go out after about May 3; in half of years the first frost comes by October 7.
A year in Commerce City at a glance
Each month’s typical high and low, and what it brings.
What stands out about Commerce City’s climate
Compared with towns across the U.S., with Commerce City’s place in Colorado beside it.
What a year in Commerce City feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 155 frost-free days a year
In half of years the last 32° night comes by May 3 and the first by October 7. Frost and day counts come from NOAA’s station at Brighton 3 Se, CO, 5 miles from the city’s center point, 130 ft lower.
The 2023 USDA map puts Commerce City’s center in zone 6a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −10°. 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 35 inches of snow a winter
Snow, measured at Brighton 3 Se, CO, falls mostly in March and November. Precipitation (rain plus melted snow) adds up to 14 inches a year; May is the wettest month and December the driest. Rain or snow falls on about 67 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Commerce City
89% 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 Brighton 3 Se, CO.
Living with Commerce City’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
155 frost-free days in zone 6a. The last frost comes by May 3 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 7.
Months with highs of 62–84° and lows of 40° or more: May and September. 26 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Commerce City from natural hazards, hail is the largest share (36%); heat waves, cold waves, winter storms and ice storms together are 19%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Commerce City and its neighbors
Every town next door is within a degree of Commerce City in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Commerce City’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 |
|---|---|---|---|---|
| Commerce City, CO | 17° | 90° | 14" | 35" |
| Tremonton, UT | 17° | 91° | 15" | 40" |
| Torrington, WY | 14° | 90° | 13" | 31" |
| Spring Creek, NV | 15° | 89° | 14" | 41" |
| Chubbuck, ID | 17° | 88° | 12" | 39" |
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 Commerce City averaged 1.6° warmer than the 1900s. The biggest change is in March (+3.5°).
A bigger shift than in 66% 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 Commerce City compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Commerce City’s place among Colorado’s.
Commerce City weather by month
Highs, lows and precipitation from NOAA’s grid at Commerce City’s center; snow, wet days and snow on the ground from Brighton 3 Se, CO. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 45° | 17° | 0.4" | 5.2" | 4 | 9 | 21° – 38° |
| February | 47° | 20° | 0.5" | 5.3" | 4 | 7 | 28° – 41° |
| March | 56° | 27° | 0.9" | 6.0" | 6 | 3 | 35° – 49° |
| April | 63° | 33° | 1.8" | 3.1" | 7 | 2 | 42° – 54° |
| May | 72° | 43° | 2.4" | 0.5" | 8 | 0 | 52° – 62° |
| June | 84° | 53° | 1.6" | 0.0" | 7 | 0 | 64° – 74° |
| July | 90° | 59° | 1.8" | 0.0" | 7 | 0 | 70° – 78° |
| August | 88° | 56° | 1.6" | 0.0" | 6 | 0 | 68° – 76° |
| September | 80° | 48° | 1.2" | 0.2" | 5 | 0 | 59° – 69° |
| October | 66° | 36° | 1.0" | 3.2" | 5 | 1 | 43° – 57° |
| November | 54° | 25° | 0.7" | 5.8" | 4 | 5 | 31° – 47° |
| December | 45° | 17° | 0.4" | 5.2" | 4 | 9 | 24° – 35° |
| Year | 66° | 36° | 14.2" | 34.5" | 67 | 37 |
How much a month can swing
A normal is an average. January swings the most: from 1991 to 2020 its average ranged from 21° to 38°. July is the most reliable, staying within 7°.
Where Commerce City’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 Commerce City’s center.
- Snow: Brighton 3 Se, CO.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Brighton 3 Se, CO, 5 miles from the city’s center point, 130 ft lower; 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 Commerce City’s climate
What is the weather like in Commerce City?
A typical July afternoon reaches 90°, a January night drops to 17°, and about 35 inches of snow falls in a normal winter. Colder January nights than 74% of U.S. towns; hotter July afternoons than 77% of U.S. towns.
How cold does it get in Commerce City in winter?
January nights average 17°. About 163 nights a year reach 32° or below and 8 reach 0° or below. In the coldest January of the last 30 years the month averaged 21°.
How much snow does Commerce City get?
About 35 inches in a normal winter at Brighton 3 Se, CO, most of it in March and November, with snow on the ground about 37 days a year.
How hot does it get in Commerce City?
July, with a typical high of 90° and a low of 59°. About 49 days a year reach 90° and 3 reach 100° (Brighton 3 Se, CO).
When is the first and last frost in Commerce City?
In half of years the last spring frost (32°) comes by May 3 and the first fall frost by October 7, about 155 frost-free days, at Brighton 3 Se, CO.
What growing zone is Commerce City in?
Zone 6a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −10°.
What is the best time of year to visit Commerce City?
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 Commerce City getting warmer?
Yes: 1991–2020 averaged 1.6° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 66% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Commerce City.
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.