Photo: Jeffrey Beall · CC BY 3.0Less rain and snow falls on Bow Mar than on 92% of U.S. towns: 16 inches a year
Sunny July days climb to about 89°. By July afternoons alone, it runs hotter than 73% of U.S. towns. Decade by decade the climate has edged up, 1.4° above 1901–2000. Picnics, hikes and garden evenings suit May, June and September, with highs of 72–83°.
A year in Bow Mar at a glance
Each month’s typical high and low, and what it brings.
What stands out about Bow Mar’s climate
Compared with towns across the U.S., with Bow Mar’s place in Colorado beside it.
What a year in Bow Mar feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 160 frost-free days a year
In half of years the last 32° night comes by May 2 and the first by October 11. Frost and day counts come from NOAA’s station at Marston Fltr Plt, CO, 0.9 miles from the town’s center, at about the same height.
The 2023 USDA map puts Bow Mar’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 34 inches of snow a winter
Snow, measured at Marston Fltr Plt, CO, falls mostly in January, February and December. Precipitation (rain plus melted snow) adds up to 16 inches a year; May is the wettest month and December the driest. Rain or snow falls on about 74 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Bow Mar
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 Marston Fltr Plt, CO.
Living with Bow Mar’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
160 frost-free days in zone 6a. The last frost comes by May 2 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 11.
Months with highs of 62–84° and lows of 40° or more: May, June and September. 0.1 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Bow Mar from natural hazards, river flooding is the largest share (51%); heat waves, cold waves, winter storms and ice storms together are 5%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Bow Mar and its neighbors
Every town next door is within a degree of Bow Mar in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Bow Mar’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 |
|---|---|---|---|---|
| Bow Mar, CO | 20° | 89° | 16" | 34" |
| Sidney, NE | 15° | 89° | 17" | 29" |
| Tremonton, UT | 17° | 91° | 15" | 40" |
| Chubbuck, ID | 17° | 88° | 12" | 39" |
| Spring Creek, NV | 15° | 89° | 14" | 41" |
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 Bow Mar averaged 1.4° warmer than the 1900s. The biggest change is in March (+3.4°).
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 Bow Mar compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Bow Mar’s place among Colorado’s.
Bow Mar weather by month
Highs, lows and precipitation from NOAA’s grid at Bow Mar’s center; snow, wet days and snow on the ground from Marston Fltr Plt, CO. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 47° | 20° | 0.5" | 6.3" | 4 | 6 | 25° – 39° |
| February | 48° | 21° | 0.6" | 6.2" | 4 | 8 | 29° – 42° |
| March | 57° | 28° | 1.2" | 5.4" | 5 | 4 | 36° – 49° |
| April | 63° | 34° | 2.0" | 4.1" | 7 | 1 | 43° – 54° |
| May | 72° | 44° | 2.6" | 0.8" | 10 | 0 | 51° – 62° |
| June | 83° | 53° | 1.7" | 0.0" | 8 | 0 | 64° – 74° |
| July | 89° | 59° | 1.9" | 0.0" | 8 | 0 | 70° – 78° |
| August | 87° | 57° | 1.8" | 0.0" | 9 | 0 | 68° – 75° |
| September | 79° | 48° | 1.3" | 0.0" | 6 | 0 | 58° – 68° |
| October | 66° | 36° | 1.2" | 1.7" | 5 | 1 | 43° – 57° |
| November | 55° | 27° | 0.8" | 3.7" | 4 | 3 | 32° – 48° |
| December | 46° | 19° | 0.5" | 5.9" | 4 | 7 | 26° – 37° |
| Year | 66° | 37° | 16.2" | 34.1" | 74 | 31 |
How much a month can swing
A normal is an average. November swings the most: from 1991 to 2020 its average ranged from 32° to 48°. July is the most reliable, staying within 7°.
Where Bow Mar’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 Bow Mar’s center.
- Snow: Marston Fltr Plt, CO (NOAA station in town).
- Frost, freezing nights, 90° and 100° days, heating and cooling: Marston Fltr Plt, CO, 0.9 miles from the town’s center, at about the same height; 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 Bow Mar’s climate
What is the weather like in Bow Mar?
A typical July afternoon reaches 89°, a January night drops to 20°, and about 34 inches of snow falls in a normal winter. Colder January nights than 62% of U.S. towns; hotter July afternoons than 73% of U.S. towns.
How cold does it get in Bow Mar in winter?
December nights average 19°. About 147 nights a year reach 32° or below and 4 reach 0° or below. In the coldest December of the last 30 years the month averaged 26°.
How much snow does Bow Mar get?
About 34 inches in a normal winter at Marston Fltr Plt, CO, most of it in January, February and December, with snow on the ground about 31 days a year.
How hot does it get in Bow Mar?
July, with a typical high of 89° and a low of 59°. About 33 days a year reach 90° (Marston Fltr Plt, CO).
When is the first and last frost in Bow Mar?
In half of years the last spring frost (32°) comes by May 2 and the first fall frost by October 11, about 160 frost-free days, at Marston Fltr Plt, CO.
What growing zone is Bow Mar 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 Bow Mar?
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 Bow Mar 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 Bow Mar.
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.