Photo: Jeffrey Beall · CC BY 3.0Wiley reaches 100° on about 15 days a year, more than 93% of U.S. towns
In January the night’s low is typically 16°. From frosty January to warm July, readings climb 78°. Its yearly precipitation falls short of 93% of U.S. towns. Homes need heating from November to March, the months averaging under 50°.
A year in Wiley at a glance
Each month’s typical high and low, and what it brings.
What stands out about Wiley’s climate
Compared with towns across the U.S., with Wiley’s place in Colorado beside it.
What a year in Wiley feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 163 frost-free days a year
In half of years the last 32° night comes by April 30 and the first by October 10. Frost and day counts come from NOAA’s station at Lamar, CO, 6 miles from the town’s center, 120 ft lower.
The 2023 USDA map puts Wiley’s center in zone 6a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −9°. 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 30 inches of snow a winter
Snow, measured at Lamar, CO, falls mostly in January and December. Precipitation (rain plus melted snow) adds up to 15 inches a year; July is the wettest month and January the driest. Rain or snow falls on about 62 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Wiley
82% of the work is heating. 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 Lamar, CO.
Living with Wiley’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
163 frost-free days in zone 6a. The last frost comes by Apr 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 Oct 10.
Months with highs of 62–84° and lows of 40° or more: May and September.
Parks & trails →Of the yearly building losses FEMA expects in Wiley from natural hazards, river flooding is the largest share (44%); heat waves, cold waves, winter storms and ice storms together are 11%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Wiley and similar climates
TownRatings has no climate map of the towns around Wiley yet.
Climates most like Wiley’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 |
|---|---|---|---|---|
| Wiley, CO | 16° | 94° | 15" | 30" |
| Grantsville, UT | 20° | 94° | 13" | 33" |
| Winnemucca, NV | 21° | 93° | 8" | 22" |
| Weiser, ID | 22° | 94° | 13" | 15" |
| Torrington, WY | 14° | 90° | 13" | 31" |
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 Wiley averaged 1.2° warmer than the 1900s. The biggest change is in March (+2.9°).
A smaller shift than in 60% 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 Wiley compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Wiley’s place among Colorado’s.
Wiley weather by month
Highs, lows and precipitation from NOAA’s grid at Wiley’s center; snow, wet days and snow on the ground from Lamar, CO. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 46° | 16° | 0.3" | 6.3" | 3 | 5 | 16° – 37° |
| February | 50° | 20° | 0.3" | 5.4" | 3 | 4 | 24° – 42° |
| March | 61° | 29° | 0.7" | 4.7" | 4 | 2 | 39° – 51° |
| April | 69° | 37° | 1.3" | 1.7" | 6 | 1 | 47° – 57° |
| May | 78° | 48° | 1.9" | 0.1" | 8 | 0 | 57° – 69° |
| June | 90° | 58° | 2.1" | 0.0" | 7 | 0 | 68° – 79° |
| July | 94° | 63° | 2.7" | 0.0" | 8 | 0 | 74° – 83° |
| August | 91° | 61° | 2.6" | 0.0" | 7 | 0 | 71° – 81° |
| September | 84° | 53° | 1.0" | 0.0" | 5 | 0 | 62° – 74° |
| October | 71° | 38° | 1.1" | 2.1" | 4 | 1 | 47° – 60° |
| November | 57° | 26° | 0.4" | 3.6" | 3 | 2 | 34° – 47° |
| December | 46° | 17° | 0.3" | 5.9" | 3 | 5 | 23° – 38° |
| Year | 70° | 39° | 14.6" | 29.8" | 62 | 19 |
How much a month can swing
A normal is an average. January swings the most: from 1991 to 2020 its average ranged from 16° to 37°. July is the most reliable, staying within 9°.
Where Wiley’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 Wiley’s center.
- Snow: Lamar, CO.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Lamar, CO, 6 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 Wiley’s climate
What is the weather like in Wiley?
A typical July afternoon reaches 94°, a January night drops to 16°, and about 30 inches of snow falls in a normal winter. Colder January nights than 79% of U.S. towns; hotter July afternoons than 93% of U.S. towns.
How cold does it get in Wiley in winter?
January nights average 16°. About 160 nights a year reach 32° or below and 5 reach 0° or below. In the coldest January of the last 30 years the month averaged 16°.
How much snow does Wiley get?
About 30 inches in a normal winter at Lamar, CO, most of it in January and December, with snow on the ground about 19 days a year.
How hot does it get in Wiley?
July, with a typical high of 94° and a low of 63°. About 73 days a year reach 90° and 15 reach 100° (Lamar, CO).
When is the first and last frost in Wiley?
In half of years the last spring frost (32°) comes by April 30 and the first fall frost by October 10, about 163 frost-free days, at Lamar, CO.
What growing zone is Wiley in?
Zone 6a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −9°.
What is the best time of year to visit Wiley?
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 Wiley getting warmer?
Yes: 1991–2020 averaged 1.2° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 60% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Wiley.
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.