Photo: Jeffrey Beall · CC BY 3.0Brook Forest gets about 106 inches of snow a winter, more than 98% of U.S. towns
July afternoons average 76°. Winter and summer sit 61° apart. Summers stay cool: July afternoons here are cooler than in 98% of U.S. towns. Radiators earn their keep from October to May, the months that average under 50°.
A year in Brook Forest at a glance
Each month’s typical high and low, and what it brings.
What stands out about Brook Forest’s climate
Compared with towns across the U.S., with Brook Forest’s place in Colorado beside it.
What a year in Brook Forest feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 112 frost-free days a year
In half of years the last 32° night comes by May 30 and the first by September 19. Frost and day counts come from NOAA’s station at Georgetown, CO, 19 miles from the town’s center, 120 ft lower.
The 2023 USDA map puts Brook Forest’s center in zone 5b: the coldest night of a typical winter, averaged over 1991–2020, reaches about −12°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
About 106 inches of snow a winter
Snow, measured at Georgetown, CO, falls mostly in April. Precipitation (rain plus melted snow) adds up to 20 inches a year; April is the wettest month and January the driest. Rain or snow falls on about 120 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Brook Forest
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 Georgetown, CO.
Living with Brook Forest’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
112 frost-free days in zone 5b. The last frost comes by May 30 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Sep 19.
Months with highs of 62–84° and lows of 40° or more: June, July, August and September. 0.4 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Brook Forest from natural hazards, wildfire is the largest share (67%); heat waves, cold waves, winter storms and ice storms together are 1%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Brook Forest and similar climates
TownRatings has no climate map of the towns around Brook Forest yet.
Climates most like Brook Forest’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 |
|---|---|---|---|---|
| Brook Forest, CO | 16° | 76° | 20" | 106" |
| Marquette, MI | 11° | 76° | 32" | 102" |
| Snyderville, UT | 18° | 80° | 26" | 153" |
| Lewistown, MT | 12° | 82° | 18" | 112" |
| Jackson, WY | 6° | 80° | 19" | 78" |
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 Brook Forest averaged 1.3° warmer than the 1900s. The biggest change is in March (+3.1°).
A smaller shift than in 56% 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 Brook Forest compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Brook Forest’s place among Colorado’s.
Brook Forest weather by month
Highs, lows and precipitation from NOAA’s grid at Brook Forest’s center; snow, wet days and snow on the ground from Georgetown, CO. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 37° | 16° | 0.7" | 12.5" | 9 | 23 | 21° – 32° |
| February | 38° | 16° | 0.9" | 12.6" | 9 | 20 | 21° – 34° |
| March | 45° | 21° | 1.8" | 18.5" | 11 | 14 | 28° – 39° |
| April | 50° | 26° | 2.7" | 20.9" | 12 | 10 | 33° – 43° |
| May | 59° | 34° | 2.4" | 6.6" | 10 | 3 | 41° – 50° |
| June | 71° | 42° | 1.9" | 0.2" | 10 | 0 | 53° – 62° |
| July | 76° | 49° | 2.5" | 0.0" | 13 | 0 | 59° – 66° |
| August | 74° | 47° | 2.6" | 0.0" | 14 | 0 | 56° – 64° |
| September | 67° | 40° | 1.7" | 1.6" | 10 | 1 | 49° – 58° |
| October | 56° | 30° | 1.3" | 7.5" | 8 | 4 | 36° – 48° |
| November | 44° | 22° | 0.9" | 11.1" | 7 | 12 | 25° – 39° |
| December | 37° | 15° | 0.7" | 14.4" | 9 | 22 | 20° – 31° |
| Year | 55° | 30° | 20.0" | 105.9" | 120 | 108 |
How much a month can swing
A normal is an average. November swings the most: from 1991 to 2020 its average ranged from 25° to 39°. July is the most reliable, staying within 7°.
Where Brook Forest’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 Brook Forest’s center.
- Snow: Georgetown, CO.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Georgetown, CO, 19 miles from the town’s center, 120 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 Brook Forest’s climate
What is the weather like in Brook Forest?
A typical July afternoon reaches 76°, a January night drops to 16°, and about 106 inches of snow falls in a normal winter. Colder January nights than 80% of U.S. towns; cooler July afternoons than 98% of U.S. towns.
How cold does it get in Brook Forest in winter?
December nights average 15°. About 210 nights a year reach 32° or below and 8 reach 0° or below. In the coldest December of the last 30 years the month averaged 20°.
How much snow does Brook Forest get?
About 106 inches in a normal winter at Georgetown, CO, most of it in April, with snow on the ground about 108 days a year.
How hot does it get in Brook Forest?
July, with a typical high of 76°. 90° days are rare: none in a normal year at Georgetown, CO.
When is the first and last frost in Brook Forest?
In half of years the last spring frost (32°) comes by May 30 and the first fall frost by September 19, about 112 frost-free days, at Georgetown, CO.
What growing zone is Brook Forest in?
Zone 5b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −12°.
What is the best time of year to visit Brook Forest?
By one simple rule (highs of 62–84° and lows of 40° or more), June, July, August and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Brook Forest getting warmer?
Yes: 1991–2020 averaged 1.3° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 56% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Brook Forest.
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.