Photo: MARELBU · CC BY 3.0Hardly any U.S. towns collect less precipitation than Dennehotso: 6 inches a year
Peak summer warmth arrives in July, with afternoons near 95°. Its July heat outdoes that of 94% of U.S. towns. The latest 30-year average runs 1.4° warmer than 1901–2000’s, with March up the most. The heating season runs November to March: each of those months averages under 50°.
A year in Dennehotso at a glance
Each month’s typical high and low, and what it brings.
What stands out about Dennehotso’s climate
Compared with towns across the U.S., with Dennehotso’s place in Arizona beside it.
What a year in Dennehotso feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 205 frost-free days a year
In half of years the last 32° night comes by April 10 and the first by November 1. Frost and day counts come from NOAA’s station at Monument Valley, AZ, 17 miles from the town’s center, 420 ft higher.
The 2023 USDA map puts Dennehotso’s center in zone 7a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 3°. 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 6 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 Dennehotso
75% of the work is heating. Months averaging under 55° run from November 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 Monument Valley, AZ.
Living with Dennehotso’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
205 frost-free days in zone 7a. The last frost comes by Apr 10 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Nov 1.
Months with highs of 62–84° and lows of 40° or more: May and October. 24 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Dennehotso from natural hazards, river flooding is the largest share (89%); heat waves, cold waves, winter storms and ice storms together are 2%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Dennehotso and similar climates
TownRatings has no climate map of the towns around Dennehotso 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 Dennehotso averaged 1.4° warmer than the 1900s. The biggest change is in March (+2.6°).
A bigger shift than in 54% 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 Dennehotso compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Dennehotso’s place among Arizona’s.
Dennehotso weather by month
Highs, lows and precipitation from NOAA’s grid at Dennehotso’s center. 1991–2020 normals.
| Month | High | Low | Rain + melt | 30-yr range |
|---|---|---|---|---|
| January | 44° | 22° | 0.5" | 24° – 39° |
| February | 51° | 26° | 0.4" | 34° – 46° |
| March | 61° | 33° | 0.5" | 43° – 52° |
| April | 69° | 39° | 0.3" | 49° – 59° |
| May | 79° | 48° | 0.4" | 58° – 69° |
| June | 91° | 58° | 0.1" | 69° – 79° |
| July | 95° | 65° | 0.6" | 76° – 83° |
| August | 92° | 63° | 0.8" | 75° – 81° |
| September | 84° | 54° | 0.6" | 64° – 72° |
| October | 71° | 41° | 0.7" | 52° – 60° |
| November | 56° | 30° | 0.4" | 36° – 48° |
| December | 44° | 21° | 0.6" | 26° – 38° |
| Year | 70° | 42° | 5.8" |
How much a month can swing
A normal is an average. January swings the most: from 1991 to 2020 its average ranged from 24° to 39°. August is the most reliable, staying within 7°.
Where Dennehotso’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 Dennehotso’s center.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Monument Valley, AZ, 17 miles from the town’s center, 420 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 Dennehotso’s climate
What is the weather like in Dennehotso?
A typical July afternoon reaches 95°, a January night drops to 22°. Milder January nights than 50% of U.S. towns; hotter July afternoons than 94% of U.S. towns.
How cold does it get in Dennehotso in winter?
December nights average 21°. About 105 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 26°.
How hot does it get in Dennehotso?
July, with a typical high of 95° and a low of 65°. About 59 days a year reach 90° and 2 reach 100° (Monument Valley, AZ).
When is the first and last frost in Dennehotso?
In half of years the last spring frost (32°) comes by April 10 and the first fall frost by November 1, about 205 frost-free days, at Monument Valley, AZ.
What growing zone is Dennehotso in?
Zone 7a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 3°.
What is the best time of year to visit Dennehotso?
By one simple rule (highs of 62–84° and lows of 40° or more), May and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Dennehotso getting warmer?
Yes: 1991–2020 averaged 1.4° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 54% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Dennehotso.
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.