Few U.S. towns have colder winter nights than Barrett Township
Peak summer warmth arrives in July, with afternoons near 85°. The year swings widely: the coldest month’s nights and the warmest month’s afternoons are 79° apart. Precipitation is light here, less than falls on 92% of U.S. towns. Radiators earn their keep from October to April, the months that average under 50°.
A year in Barrett Township at a glance
Each month’s typical high and low, and what it brings.
What stands out about Barrett Township’s climate
Compared with towns across the U.S., with Barrett Township’s place in South Dakota beside it.
What a year in Barrett Township feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 131 frost-free days a year
In half of years the last 32° night comes by May 16 and the first by September 24. Frost and day counts come from NOAA’s station at Shadehill Reservoir, SD, 14 miles from the town’s center, 120 ft lower.
The 2023 USDA map puts Barrett Township’s center in zone 4b: the coldest night of a typical winter, averaged over 1991–2020, reaches about −24°. 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 40 inches of snow a winter
Snow, measured at Bison, SD, falls mostly in February. Precipitation (rain plus melted snow) adds up to 16 inches a year; June is the wettest month and January the driest. Rain or snow falls on about 57 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Barrett Township
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 Shadehill Reservoir, SD.
Living with Barrett Township’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
131 frost-free days in zone 4b. The last frost comes by May 16 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 24.
Months with highs of 62–84° and lows of 40° or more: May, June and September. 0.0 miles of trails are waiting.
Parks & trails →Cold waves are 41% of the yearly building losses FEMA expects in Barrett Township from natural hazards, the largest share. Normals are averages; the hazards page covers the extremes.
Natural hazards →Barrett Township and its neighbors
Every town next door is within a degree of Barrett Township in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Barrett Township’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 |
|---|---|---|---|---|
| Barrett Township, SD | 7° | 85° | 16" | 40" |
| Havre, MT | 6° | 85° | 13" | 41" |
| Gypsum, CO | 11° | 86° | 14" | 39" |
| Williston, ND | 2° | 84° | 15" | 48" |
| Taos, NM | 11° | 84° | 13" | 28" |
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
Warmer than it used to be
The last 30 years in Barrett Township averaged 1.5° warmer than the 1900s. The biggest change is in January (+4.2°).
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 Barrett Township compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Barrett Township’s place among South Dakota’s.
Barrett Township weather by month
Highs, lows and precipitation from NOAA’s grid at Barrett Township’s center; snow, wet days and snow on the ground from Bison, SD. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | 30-yr range |
|---|---|---|---|---|---|---|
| January | 28° | 7° | 0.3" | 5.6" | 3 | 8° – 30° |
| February | 32° | 10° | 0.5" | 8.0" | 4 | 1° – 32° |
| March | 44° | 20° | 0.7" | 7.0" | 4 | 20° – 45° |
| April | 56° | 30° | 1.5" | 5.4" | 6 | 36° – 49° |
| May | 67° | 40° | 2.8" | 0.7" | 7 | 48° – 59° |
| June | 77° | 51° | 3.0" | 0.0" | 8 | 59° – 69° |
| July | 85° | 57° | 2.3" | 0.0" | 7 | 62° – 78° |
| August | 84° | 54° | 1.7" | 0.0" | 5 | 63° – 75° |
| September | 75° | 44° | 1.3" | 0.0" | 4 | 53° – 65° |
| October | 58° | 31° | 1.4" | 3.0" | 4 | 37° – 50° |
| November | 42° | 20° | 0.5" | 4.1" | 3 | 18° – 42° |
| December | 31° | 10° | 0.3" | 5.9" | 3 | 9° – 29° |
| Year | 56° | 31° | 16.4" | 39.7" | 57 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 1° to 32°. June is the most reliable, staying within 10°.
Where Barrett Township’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 Barrett Township’s center.
- Snow: Bison, SD.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Shadehill Reservoir, SD, 14 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 Barrett Township’s climate
What is the weather like in Barrett Township?
A typical July afternoon reaches 85°, a January night drops to 7°, and about 40 inches of snow falls in a normal winter. Colder January nights than 97% of U.S. towns; hotter July afternoons than 51% of U.S. towns.
How cold does it get in Barrett Township in winter?
January nights average 7°. About 188 nights a year reach 32° or below and 32 reach 0° or below. In the coldest January of the last 30 years the month averaged 8°.
How much snow does Barrett Township get?
About 40 inches in a normal winter at Bison, SD, most of it in February.
How hot does it get in Barrett Township?
July, with a typical high of 85° and a low of 57°. About 36 days a year reach 90° and 6 reach 100° (Shadehill Reservoir, SD).
When is the first and last frost in Barrett Township?
In half of years the last spring frost (32°) comes by May 16 and the first fall frost by September 24, about 131 frost-free days, at Shadehill Reservoir, SD.
What growing zone is Barrett Township in?
Zone 4b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −24°.
What is the best time of year to visit Barrett Township?
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 Barrett Township getting warmer?
Yes: 1991–2020 averaged 1.5° 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 Barrett Township.
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.