Hardly any U.S. towns see harsher January nights than Le Sueur Township
Peak summer warmth arrives in July, with afternoons near 84°. The seasons are far apart: from a winter night to a summer afternoon the average spans 79°. It is a dry place: less rain and snow fall here than on 88% of U.S. towns. Picnics, hikes and garden evenings come into their own from May to September, with highs of 69–84°.
A year in Le Sueur Township at a glance
Each month’s typical high and low, and what it brings.
What stands out about Le Sueur Township’s climate
Compared with towns across the U.S., with Le Sueur Township’s place in South Dakota beside it.
What a year in Le Sueur Township feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 151 frost-free days a year
In half of years the last 32° night comes by May 5 and the first by October 4. Frost and day counts come from NOAA’s station at De Smet, SD, 13 miles from the town’s center, 150 ft higher.
The 2023 USDA map puts Le Sueur Township’s center in zone 4b: the coldest night of a typical winter, averaged over 1991–2020, reaches about −22°. 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 39 inches of snow a winter
Snow, measured at Iroquois, SD, falls mostly in December. Precipitation (rain plus melted snow) adds up to 24 inches a year; June is the wettest month and January the driest. Rain or snow falls on about 72 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Le Sueur 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 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 De Smet, SD.
Living with Le Sueur Township’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
151 frost-free days in zone 4b. The last frost comes by May 5 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, July, August and September. 4.9 miles of trails are waiting.
Parks & trails →Cold waves are 28% of the yearly building losses FEMA expects in Le Sueur Township from natural hazards, the largest share. Normals are averages; the hazards page covers the extremes.
Natural hazards →Le Sueur Township and its neighbors
Every town next door is within a degree of Le Sueur Township in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Le Sueur 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 |
|---|---|---|---|---|
| Le Sueur Township, SD | 5° | 84° | 24" | 39" |
| New Ulm, MN | 6° | 83° | 30" | 38" |
| Spencer, IA | 7° | 84° | 31" | 43" |
| Bismarck, ND | 3° | 84° | 18" | 51" |
| Wayne, NE | 11° | 85° | 29" | 32" |
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 Le Sueur Township averaged 1.2° warmer than the 1900s. The biggest change is in January (+3.2°).
A smaller shift than in 59% 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 Le Sueur Township compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Le Sueur Township’s place among South Dakota’s.
Le Sueur Township weather by month
Highs, lows and precipitation from NOAA’s grid at Le Sueur Township’s center; snow, wet days and snow on the ground from Iroquois, SD. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 24° | 5° | 0.5" | 6.7" | 5 | 25 | 3° – 29° |
| February | 29° | 9° | 0.7" | 6.4" | 5 | 17 | 5° – 31° |
| March | 42° | 21° | 1.1" | 6.5" | 5 | 10 | 21° – 47° |
| April | 57° | 33° | 2.3" | 4.6" | 7 | 2 | 35° – 52° |
| May | 69° | 46° | 3.1" | 0.0" | 9 | 0 | 53° – 64° |
| June | 79° | 56° | 3.9" | 0.0" | 8 | 0 | 62° – 71° |
| July | 84° | 61° | 3.2" | 0.0" | 8 | 0 | 64° – 80° |
| August | 82° | 59° | 3.1" | 0.0" | 7 | 0 | 65° – 74° |
| September | 74° | 50° | 2.5" | 0.0" | 6 | 0 | 55° – 68° |
| October | 59° | 36° | 2.1" | 1.2" | 5 | 1 | 39° – 52° |
| November | 42° | 22° | 0.9" | 5.0" | 4 | 4 | 21° – 42° |
| December | 29° | 10° | 0.6" | 8.6" | 5 | 18 | 6° – 26° |
| Year | 56° | 34° | 24.1" | 39.0" | 72 | 76 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 5° to 31°. August is the most reliable, staying within 9°.
Where Le Sueur 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 Le Sueur Township’s center.
- Snow: Iroquois, SD.
- Frost, freezing nights, 90° and 100° days, heating and cooling: De Smet, SD, 13 miles from the town’s center, 150 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 Le Sueur Township’s climate
What is the weather like in Le Sueur Township?
A typical July afternoon reaches 84°, a January night drops to 5°, and about 39 inches of snow falls in a normal winter. Colder January nights than 98% of U.S. towns; cooler July afternoons than 61% of U.S. towns.
How cold does it get in Le Sueur Township in winter?
January nights average 5°. About 165 nights a year reach 32° or below and 27 reach 0° or below. In the coldest January of the last 30 years the month averaged 3°.
How much snow does Le Sueur Township get?
About 39 inches in a normal winter at Iroquois, SD, most of it in December, with snow on the ground about 76 days a year.
How hot does it get in Le Sueur Township?
July, with a typical high of 84° and a low of 61°. About 10 days a year reach 90° (De Smet, SD).
When is the first and last frost in Le Sueur Township?
In half of years the last spring frost (32°) comes by May 5 and the first fall frost by October 4, about 151 frost-free days, at De Smet, SD.
What growing zone is Le Sueur Township in?
Zone 4b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −22°.
What is the best time of year to visit Le Sueur Township?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, July, August and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Le Sueur Township getting warmer?
Yes: 1991–2020 averaged 1.2° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 59% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Le Sueur 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.