Photo: Jeffrey Beall · CC BY 3.0Precipitation in Holly Hills trails that of 93% of U.S. towns: 15 inches a year
The coldest hours of a January night bottom out at 19° on average. Summer afternoons here are warmer than in 72% of U.S. towns. The latest 30-year average runs 1.5° warmer than 1901–2000’s, with March up the most. For walks and days out, May, June and September bring highs of 71–83°.
A year in Holly Hills at a glance
Each month’s typical high and low, and what it brings.
What stands out about Holly Hills’ climate
Compared with towns across the U.S., with Holly Hills’ place in Colorado beside it.
What a year in Holly Hills feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 156 frost-free days a year
In half of years the last 32° night comes by May 4 and the first by October 8. Frost and day counts come from NOAA’s station at Denver-stapleton, CO, 7 miles from the town’s center, 170 ft lower.
The 2023 USDA map puts Holly Hills’ 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 64 inches of snow a winter
Snow, measured at Highlands Ranch 3.2 Ese, CO, falls mostly in February and April. Precipitation (rain plus melted snow) adds up to 15 inches a year; May is the wettest month and January the driest. Rain or snow falls on about 93 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Holly Hills
88% 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 Denver-stapleton, CO.
Living with Holly Hills’ climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
156 frost-free days in zone 6a. The last frost comes by May 4 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 8.
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 Holly Hills from natural hazards, hail is the largest share (38%); heat waves, cold waves, winter storms and ice storms together are 6%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Holly Hills and similar climates
TownRatings has no climate map of the towns around Holly Hills yet.
Climates most like Holly Hills’, 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 |
|---|---|---|---|---|
| Holly Hills, CO | 19° | 89° | 15" | 64" |
| Herriman, UT | 22° | 90° | 15" | 74" |
| Pocatello, ID | 19° | 87° | 15" | 64" |
| Billings, MT | 15° | 89° | 14" | 48" |
| Casper, WY | 15° | 89° | 12" | 82" |
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 Holly Hills averaged 1.5° warmer than the 1900s. The biggest change is in March (+3.5°).
A bigger shift than in 59% 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 Holly Hills compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Holly Hills’ place among Colorado’s.
Holly Hills weather by month
Highs, lows and precipitation from NOAA’s grid at Holly Hills’ center; snow, wet days and snow on the ground from Highlands Ranch 3.2 Ese, CO. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 46° | 19° | 0.5" | 8.1" | 5 | 22 | 24° – 39° |
| February | 48° | 21° | 0.6" | 11.6" | 6 | 19 | 29° – 42° |
| March | 56° | 28° | 1.1" | 9.9" | 6 | 11 | 36° – 49° |
| April | 62° | 34° | 1.9" | 10.9" | 9 | 5 | 42° – 53° |
| May | 71° | 44° | 2.4" | 2.5" | 12 | 1 | 51° – 62° |
| June | 83° | 53° | 1.6" | 0.0" | 8 | 0 | 64° – 74° |
| July | 89° | 59° | 2.0" | 0.0" | 11 | 0 | 70° – 78° |
| August | 87° | 57° | 1.7" | 0.0" | 10 | 0 | 68° – 76° |
| September | 79° | 49° | 1.3" | 0.0" | 7 | 0 | 58° – 68° |
| October | 66° | 36° | 0.9" | 6.3" | 7 | 4 | 43° – 57° |
| November | 55° | 27° | 0.7" | 6.1" | 5 | 8 | 32° – 48° |
| December | 46° | 19° | 0.5" | 8.6" | 6 | 19 | 26° – 36° |
| Year | 66° | 37° | 15.1" | 64.0" | 93 | 87 |
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 8°.
Where Holly Hills’ 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 Holly Hills’ center.
- Snow: Highlands Ranch 3.2 Ese, CO.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Denver-stapleton, CO, 7 miles from the town’s center, 170 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 Holly Hills’ climate
What is the weather like in Holly Hills?
A typical July afternoon reaches 89°, a January night drops to 19°, and about 64 inches of snow falls in a normal winter. Colder January nights than 62% of U.S. towns; hotter July afternoons than 72% of U.S. towns.
How cold does it get in Holly Hills in winter?
December nights average 19°. About 156 nights a year reach 32° or below and 5 reach 0° or below. In the coldest December of the last 30 years the month averaged 26°.
How much snow does Holly Hills get?
About 64 inches in a normal winter at Highlands Ranch 3.2 Ese, CO, most of it in February and April, with snow on the ground about 87 days a year.
How hot does it get in Holly Hills?
July, with a typical high of 89° and a low of 59°. About 42 days a year reach 90° and 2 reach 100° (Denver-stapleton, CO).
When is the first and last frost in Holly Hills?
In half of years the last spring frost (32°) comes by May 4 and the first fall frost by October 8, about 156 frost-free days, at Denver-stapleton, CO.
What growing zone is Holly Hills 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 Holly Hills?
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 Holly Hills getting warmer?
Yes: 1991–2020 averaged 1.5° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 59% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Holly Hills.
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.