Grand Canyon Railway · Photo: Drew Jacksich from San Jose, CA, The Republic of California · CC BY-SA 2.0Precipitation in Valle trails that of 95% of U.S. towns: 13 inches a year
Peak summer warmth arrives in July, with afternoons near 90°. In July, afternoons here are warmer than in 75% of U.S. towns. Decade by decade the climate has edged up, 1.7° above 1901–2000. Tender plants can go out after about May 9; in half of years the first frost comes by October 19.
A year in Valle at a glance
Each month’s typical high and low, and what it brings.
What stands out about Valle’s climate
Compared with towns across the U.S., with Valle’s place in Arizona beside it.
What a year in Valle feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 161 frost-free days a year
In half of years the last 32° night comes by May 9 and the first by October 19. Frost and day counts come from NOAA’s station at Williams 35 Nnw, AZ, 12 miles from the town’s center, at about the same height.
The 2023 USDA map puts Valle’s center in zone 7a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 1°. 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 13 inches of rain a year
August is the wettest month and June the driest.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Valle
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 Williams 35 Nnw, AZ.
Living with Valle’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
161 frost-free days in zone 7a. The last frost comes by May 9 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 19.
Months with highs of 62–84° and lows of 40° or more: September. 151 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Valle from natural hazards, wildfire is the largest share (61%); heat waves, cold waves, winter storms and ice storms together are 2%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Valle and similar climates
TownRatings has no climate map of the towns around Valle yet.
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 Valle averaged 1.7° warmer than the 1900s. The biggest change is in January (+3.0°).
A bigger shift than in 72% 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 Valle compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Valle’s place among Arizona’s.
Valle weather by month
Highs, lows and precipitation from NOAA’s grid at Valle’s center. 1991–2020 normals.
| Month | High | Low | Rain + melt | 30-yr range |
|---|---|---|---|---|
| January | 48° | 20° | 1.2" | 28° – 41° |
| February | 52° | 22° | 1.3" | 31° – 43° |
| March | 59° | 27° | 1.2" | 37° – 49° |
| April | 66° | 32° | 0.6" | 44° – 53° |
| May | 75° | 39° | 0.6" | 51° – 62° |
| June | 87° | 47° | 0.3" | 62° – 71° |
| July | 90° | 55° | 1.8" | 69° – 75° |
| August | 87° | 54° | 2.2" | 67° – 76° |
| September | 81° | 46° | 1.4" | 60° – 66° |
| October | 69° | 35° | 1.1" | 48° – 58° |
| November | 57° | 26° | 0.7" | 35° – 48° |
| December | 47° | 19° | 0.9" | 28° – 38° |
| Year | 68° | 35° | 13.2" |
How much a month can swing
A normal is an average. November swings the most: from 1991 to 2020 its average ranged from 35° to 48°. July is the most reliable, staying within 5°.
Where Valle’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 Valle’s center.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Williams 35 Nnw, AZ, 12 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 Valle’s climate
What is the weather like in Valle?
A typical July afternoon reaches 90°, a January night drops to 20°. Colder January nights than 59% of U.S. towns; hotter July afternoons than 75% of U.S. towns.
How cold does it get in Valle in winter?
December nights average 19°. About 144 nights a year reach 32° or below and 1 reach 0° or below. In the coldest December of the last 30 years the month averaged 28°.
How hot does it get in Valle?
July, with a typical high of 90° and a low of 55°. About 30 days a year reach 90° (Williams 35 Nnw, AZ).
When is the first and last frost in Valle?
In half of years the last spring frost (32°) comes by May 9 and the first fall frost by October 19, about 161 frost-free days, at Williams 35 Nnw, AZ.
What growing zone is Valle in?
Zone 7a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 1°.
What is the best time of year to visit Valle?
By one simple rule (highs of 62–84° and lows of 40° or more), September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Valle getting warmer?
Yes: 1991–2020 averaged 1.7° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 72% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Valle.
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.