Photo: Ian Poellet · CC BY-SA 4.0Precipitation in St. Maries trails that of 86% of U.S. towns: 29 inches a year
Midsummer highs settle at about 85°. Winter and summer sit 60° apart. By January nights alone, it runs milder than 63% of U.S. towns. Plan time outside for May, June and September, when highs sit at 68–74°.
A year in St. Maries at a glance
Each month’s typical high and low, and what it brings.
What stands out about St. Maries’ climate
Compared with towns across the U.S., with St. Maries’ place in Idaho beside it.
What a year in St. Maries feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 152 frost-free days a year
In half of years the last 32° night comes by May 3 and the first by October 4. Frost and day counts come from NOAA’s station at Saint Maries, ID, 0.3 miles from the town’s center, at about the same height.
The 2023 USDA map puts St. Maries’ center in zone 6b: 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 56 inches of snow a winter
Snow, measured at Saint Maries, ID, falls mostly in December. Precipitation (rain plus melted snow) adds up to 29 inches a year; January is the wettest month and July the driest. Rain or snow falls on about 136 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in St. Maries
95% 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 Saint Maries, ID.
Living with St. Maries’ climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
152 frost-free days in zone 6b. The last frost comes by May 3 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 4.
Months with highs of 62–84° and lows of 40° or more: May, June and September. 0.9 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in St. Maries from natural hazards, river flooding is the largest share (86%); heat waves, cold waves, winter storms and ice storms together are 8%. Normals are averages; the hazards page covers the extremes.
Natural hazards →St. Maries and similar climates
TownRatings has no climate map of the towns around St. Maries yet.
Climates most like St. Maries’, 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. Maries, ID | 25° | 85° | 29" | 56" |
| Oregon, OH | 21° | 85° | 33" | 37" |
| Monroe, MI | 21° | 83° | 34" | 41" |
| Geneseo, NY | 18° | 82° | 34" | 52" |
| Bellevue, PA | 22° | 85° | 40" | 44" |
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. Maries averaged 1.1° warmer than the 1900s. The biggest change is in January (+3.8°).
A smaller shift than in 74% 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. Maries compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with St. Maries’ place among Idaho’s.
St. Maries weather by month
Highs, lows and precipitation from NOAA’s grid at St. Maries’ center; snow, wet days and snow on the ground from Saint Maries, ID. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 37° | 25° | 3.9" | 16.3" | 16 | 20 | 23° – 37° |
| February | 42° | 26° | 2.7" | 8.6" | 13 | 14 | 24° – 41° |
| March | 50° | 30° | 3.0" | 5.2" | 14 | 7 | 34° – 46° |
| April | 58° | 34° | 2.3" | 0.7" | 13 | 0 | 41° – 53° |
| May | 68° | 41° | 2.4" | 0.1" | 12 | 0 | 50° – 59° |
| June | 74° | 47° | 2.0" | 0.0" | 11 | 0 | 56° – 69° |
| July | 85° | 51° | 0.8" | 0.0" | 5 | 0 | 59° – 73° |
| August | 85° | 50° | 0.8" | 0.0" | 4 | 0 | 62° – 70° |
| September | 74° | 43° | 1.1" | 0.0" | 6 | 0 | 55° – 64° |
| October | 59° | 35° | 2.3" | 0.2" | 11 | 0 | 41° – 53° |
| November | 44° | 30° | 3.7" | 6.6" | 15 | 5 | 30° – 44° |
| December | 37° | 25° | 3.8" | 18.3" | 16 | 16 | 26° – 35° |
| Year | 59° | 36° | 28.6" | 56.0" | 136 | 62 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 24° to 41°. August is the most reliable, staying within 8°.
Where St. Maries’ 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. Maries’ center.
- Snow: Saint Maries, ID (NOAA station in town).
- Frost, freezing nights, 90° and 100° days, heating and cooling: Saint Maries, ID, 0.3 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. Maries’ climate
What is the weather like in St. Maries?
A typical July afternoon reaches 85°, a January night drops to 25°, and about 56 inches of snow falls in a normal winter. Milder January nights than 63% of U.S. towns; cooler July afternoons than 55% of U.S. towns.
How cold does it get in St. Maries in winter?
December nights average 25°. About 138 nights a year reach 32° or below and 2 reach 0° or below. In the coldest December of the last 30 years the month averaged 26°.
How much snow does St. Maries get?
About 56 inches in a normal winter at Saint Maries, ID, most of it in December, with snow on the ground about 62 days a year.
How hot does it get in St. Maries?
July, with a typical high of 85° and a low of 51°. About 20 days a year reach 90° (Saint Maries, ID).
When is the first and last frost in St. Maries?
In half of years the last spring frost (32°) comes by May 3 and the first fall frost by October 4, about 152 frost-free days, at Saint Maries, ID.
What growing zone is St. Maries in?
Zone 6b 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 St. Maries?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is St. Maries getting warmer?
Yes: 1991–2020 averaged 1.1° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 74% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in St. Maries.
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.