Photo: Jeffrey Beall · CC BY 3.0Less rain and snow falls on Grover than on 94% of U.S. towns: 14 inches a year
On a normal January night the air cools to about 14°. The gap between a January night and a July afternoon is 75°. Its January nights bite harder than in 88% of U.S. towns. Seedlings are safe outdoors from about May 18, with the first autumn frost due around September 29.
A year in Grover at a glance
Each month’s typical high and low, and what it brings.
What stands out about Grover’s climate
Compared with towns across the U.S., with Grover’s place in Colorado beside it.
What a year in Grover feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 133 frost-free days a year
In half of years the last 32° night comes by May 18 and the first by September 29. Frost and day counts come from NOAA’s station at New Raymer 21 N, CO, 19 miles from the town’s center, 110 ft higher.
The 2023 USDA map puts Grover’s center in zone 5a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −16°. 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 42 inches of snow a winter
Snow, measured at New Raymer 21 N, CO, falls mostly in February, March, November 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 88 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Grover
93% 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 New Raymer 21 N, CO.
Living with Grover’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
133 frost-free days in zone 5a. The last frost comes by May 18 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 29.
Months with highs of 62–84° and lows of 40° or more: June and September.
Parks & trails →Of the yearly building losses FEMA expects in Grover from natural hazards, hail is the largest share (33%); heat waves, cold waves, winter storms and ice storms together are 25%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Grover and similar climates
TownRatings has no climate map of the towns around Grover yet.
Climates most like Grover’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 |
|---|---|---|---|---|
| Grover, CO | 14° | 89° | 14" | 42" |
| Spring Creek, NV | 15° | 89° | 14" | 41" |
| Billings, MT | 15° | 89° | 14" | 48" |
| Hyde Park, UT | 14° | 89° | 16" | 44" |
| Preston, ID | 14° | 89° | 15" | 52" |
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 Grover averaged 1.7° warmer than the 1900s. The biggest change is in March (+3.8°).
A bigger shift than in 71% 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 Grover compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Grover’s place among Colorado’s.
Grover weather by month
Highs, lows and precipitation from NOAA’s grid at Grover’s center; snow, wet days and snow on the ground from New Raymer 21 N, CO. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 42° | 14° | 0.3" | 4.6" | 4 | 11 | 20° – 35° |
| February | 44° | 15° | 0.3" | 6.4" | 5 | 10 | 21° – 37° |
| March | 54° | 23° | 0.7" | 6.3" | 6 | 5 | 32° – 46° |
| April | 61° | 30° | 1.4" | 5.6" | 9 | 3 | 39° – 51° |
| May | 70° | 40° | 2.4" | 1.7" | 12 | 1 | 48° – 59° |
| June | 82° | 49° | 2.2" | 0.0" | 10 | 0 | 60° – 72° |
| July | 89° | 56° | 2.3" | 0.0" | 10 | 0 | 67° – 76° |
| August | 87° | 53° | 1.8" | 0.0" | 9 | 0 | 66° – 74° |
| September | 78° | 44° | 1.3" | 0.6" | 8 | 0 | 56° – 65° |
| October | 64° | 32° | 1.0" | 4.2" | 7 | 2 | 40° – 54° |
| November | 50° | 21° | 0.4" | 6.2" | 5 | 6 | 27° – 42° |
| December | 41° | 14° | 0.3" | 6.6" | 4 | 10 | 20° – 33° |
| Year | 64° | 33° | 14.2" | 42.2" | 88 | 48 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 21° to 37°. August is the most reliable, staying within 8°.
Where Grover’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 Grover’s center.
- Snow: New Raymer 21 N, CO.
- Frost, freezing nights, 90° and 100° days, heating and cooling: New Raymer 21 N, CO, 19 miles from the town’s center, 110 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 Grover’s climate
What is the weather like in Grover?
A typical July afternoon reaches 89°, a January night drops to 14°, and about 42 inches of snow falls in a normal winter. Colder January nights than 88% of U.S. towns; hotter July afternoons than 71% of U.S. towns.
How cold does it get in Grover in winter?
January nights average 14°. About 192 nights a year reach 32° or below and 13 reach 0° or below. In the coldest January of the last 30 years the month averaged 20°.
How much snow does Grover get?
About 42 inches in a normal winter at New Raymer 21 N, CO, most of it in February, March, November and December, with snow on the ground about 48 days a year.
How hot does it get in Grover?
July, with a typical high of 89° and a low of 56°. About 28 days a year reach 90° (New Raymer 21 N, CO).
When is the first and last frost in Grover?
In half of years the last spring frost (32°) comes by May 18 and the first fall frost by September 29, about 133 frost-free days, at New Raymer 21 N, CO.
What growing zone is Grover in?
Zone 5a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −16°.
What is the best time of year to visit Grover?
By one simple rule (highs of 62–84° and lows of 40° or more), June and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Grover getting warmer?
Yes: 1991–2020 averaged 1.7° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 71% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Grover.
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.