Hardly any U.S. towns collect less precipitation than St. Michaels: 11 inches a year
On a normal January night the air cools to about 15°. The gap between a January night and a July afternoon is 72°. Winter nights are cold: in January they are colder than in 85% of U.S. towns. Central heating does most of its work from October to April, in months below 50° on average.
A year in St. Michaels at a glance
Each month’s typical high and low, and what it brings.
What stands out about St. Michaels’ climate
Compared with towns across the U.S., with St. Michaels’ place in Arizona beside it.
What a year in St. Michaels feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 121 frost-free days a year
In half of years the last 32° night comes by May 29 and the first by September 28. Frost and day counts come from NOAA’s station at Window Rock Airport, 2.0 miles from the town’s center, at about the same height.
The 2023 USDA map puts St. Michaels’ center in zone 6a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −7°. 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 34 inches of snow a winter
Snow, measured at Gallup Muni Airport, falls mostly in December. Precipitation (rain plus melted snow) adds up to 11 inches a year; August is the wettest month and June the driest. Rain or snow falls on about 73 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in St. Michaels
94% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October through May.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Window Rock Airport.
Living with St. Michaels’ climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
121 frost-free days in zone 6a. The last frost comes by May 29 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 28.
Months with highs of 62–84° and lows of 40° or more: June, August and September. 13 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in St. Michaels from natural hazards, river flooding is the largest share (57%); heat waves, cold waves, winter storms and ice storms together are 20%. Normals are averages; the hazards page covers the extremes.
Natural hazards →St. Michaels and similar climates
TownRatings has no climate map of the towns around St. Michaels yet.
Climates most like St. Michaels’, 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 |
|---|---|---|---|---|
| St. Michaels, AZ | 15° | 87° | 11" | 34" |
| Helena Valley West Central, MT | 15° | 85° | 11" | 37" |
| Chubbuck, ID | 17° | 88° | 12" | 39" |
| Glenwood Springs, CO | 14° | 87° | 15" | 39" |
| Cody, WY | 14° | 85° | 11" | 45" |
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 St. Michaels averaged 1.4° warmer than the 1900s. The biggest change is in March (+2.8°).
A bigger shift than in 56% 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 St. Michaels compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with St. Michaels’ place among Arizona’s.
St. Michaels weather by month
Highs, lows and precipitation from NOAA’s grid at St. Michaels’ center; snow, wet days and snow on the ground from Gallup Muni Airport. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 44° | 15° | 1.1" | 6.3" | 6 | 8 | 23° – 36° |
| February | 48° | 19° | 0.7" | 5.9" | 6 | 3 | 28° – 40° |
| March | 56° | 24° | 0.6" | 4.4" | 5 | 1 | 34° – 45° |
| April | 63° | 29° | 0.5" | 2.3" | 4 | 1 | 41° – 51° |
| May | 72° | 37° | 0.5" | 1.1" | 4 | 0 | 50° – 59° |
| June | 84° | 46° | 0.3" | 0.0" | 3 | 0 | 60° – 70° |
| July | 87° | 54° | 1.6" | 0.0" | 10 | 0 | 66° – 73° |
| August | 84° | 52° | 1.7" | 0.0" | 11 | 0 | 66° – 73° |
| September | 78° | 44° | 1.2" | 0.0" | 7 | 0 | 56° – 64° |
| October | 67° | 32° | 0.9" | 1.5" | 6 | 0 | 46° – 54° |
| November | 54° | 22° | 0.9" | 4.5" | 5 | 2 | 32° – 45° |
| December | 44° | 14° | 0.8" | 7.8" | 6 | 8 | 23° – 35° |
| Year | 65° | 32° | 10.7" | 33.8" | 73 | 23 |
How much a month can swing
A normal is an average. January swings the most: from 1991 to 2020 its average ranged from 23° to 36°. July is the most reliable, staying within 6°.
Where St. Michaels’ 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 St. Michaels’ center.
- Snow: Gallup Muni Airport.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Window Rock Airport, 2.0 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 St. Michaels’ climate
What is the weather like in St. Michaels?
A typical July afternoon reaches 87°, a January night drops to 15°, and about 34 inches of snow falls in a normal winter. Colder January nights than 85% of U.S. towns; hotter July afternoons than 59% of U.S. towns.
How cold does it get in St. Michaels in winter?
December nights average 14°. About 196 nights a year reach 32° or below and 8 reach 0° or below. In the coldest December of the last 30 years the month averaged 23°.
How much snow does St. Michaels get?
About 34 inches in a normal winter at Gallup Muni Airport, most of it in December, with snow on the ground about 23 days a year.
How hot does it get in St. Michaels?
July, with a typical high of 87° and a low of 54°. About 24 days a year reach 90° (Window Rock Airport).
When is the first and last frost in St. Michaels?
In half of years the last spring frost (32°) comes by May 29 and the first fall frost by September 28, about 121 frost-free days, at Window Rock Airport.
What growing zone is St. Michaels in?
Zone 6a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −7°.
What is the best time of year to visit St. Michaels?
By one simple rule (highs of 62–84° and lows of 40° or more), June, August and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is St. Michaels getting warmer?
Yes: 1991–2020 averaged 1.4° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 56% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in St. Michaels.
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.