Riverside Township has colder winter nights than 94% of U.S. towns
Midsummer highs settle at about 86°. The gap between a January night and a July afternoon is 76°. It is a dry place: less rain and snow fall here than on 87% of U.S. towns. Picnics, hikes and garden evenings suit May, June, August and September, with highs of 71–83°.
A year in Riverside Township at a glance
Each month’s typical high and low, and what it brings.
What stands out about Riverside Township’s climate
Compared with towns across the U.S., with Riverside Township’s place in South Dakota beside it.
What a year in Riverside 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 2 and the first by October 1. Frost and day counts come from NOAA’s station at Centerville 6 Se, SD, 4 miles from the town’s center, at about the same height.
The 2023 USDA map puts Riverside Township’s center in zone 5a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −19°. 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 31 inches of snow a winter
Snow, measured at Centerville 6 Se, SD, falls mostly in February and December. Precipitation (rain plus melted snow) adds up to 28 inches a year; June is the wettest month and January the driest. Rain or snow falls on about 94 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Riverside Township
91% 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 Centerville 6 Se, SD.
Living with Riverside Township’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
151 frost-free days in zone 5a. The last frost comes by May 2 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 1.
Months with highs of 62–84° and lows of 40° or more: May, June, August and September. 2.5 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Riverside Township from natural hazards, river flooding is the largest share (51%); heat waves, cold waves, winter storms and ice storms together are 5%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Riverside Township and its neighbors
Every town next door is within a degree of Riverside Township in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Riverside 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 |
|---|---|---|---|---|
| Riverside Township, SD | 9° | 86° | 28" | 31" |
| Grand Island, NE | 15° | 87° | 27" | 28" |
| Adel, IA | 12° | 85° | 35" | 25" |
| New Ulm, MN | 6° | 83° | 30" | 38" |
| Berlin, WI | 9° | 82° | 33" | 38" |
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 Riverside Township averaged 0.9° warmer than the 1900s. The biggest change is in January (+2.6°).
A smaller shift than in 85% 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 Riverside Township compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Riverside Township’s place among South Dakota’s.
Riverside Township weather by month
Highs, lows and precipitation from NOAA’s grid at Riverside Township’s center; snow, wet days and snow on the ground from Centerville 6 Se, SD. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 28° | 9° | 0.5" | 5.2" | 5 | 20 | 10° – 34° |
| February | 33° | 13° | 0.7" | 6.0" | 5 | 15 | 11° – 34° |
| March | 46° | 25° | 1.5" | 4.5" | 6 | 9 | 27° – 52° |
| April | 60° | 35° | 2.9" | 2.9" | 10 | 2 | 38° – 54° |
| May | 71° | 47° | 3.8" | 0.1" | 13 | 0 | 54° – 65° |
| June | 81° | 59° | 4.2" | 0.0" | 11 | 0 | 66° – 75° |
| July | 86° | 63° | 3.1" | 0.0" | 8 | 0 | 67° – 81° |
| August | 83° | 60° | 3.4" | 0.0" | 10 | 0 | 66° – 75° |
| September | 76° | 51° | 3.0" | 0.0" | 8 | 0 | 56° – 69° |
| October | 62° | 38° | 2.4" | 0.7" | 8 | 1 | 43° – 54° |
| November | 46° | 24° | 1.2" | 5.0" | 5 | 5 | 26° – 46° |
| December | 32° | 14° | 0.8" | 6.1" | 5 | 17 | 10° – 29° |
| Year | 59° | 36° | 27.5" | 30.5" | 94 | 68 |
How much a month can swing
A normal is an average. March swings the most: from 1991 to 2020 its average ranged from 27° to 52°. June is the most reliable, staying within 9°.
Where Riverside 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 Riverside Township’s center.
- Snow: Centerville 6 Se, SD.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Centerville 6 Se, SD, 4 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 Riverside Township’s climate
What is the weather like in Riverside Township?
A typical July afternoon reaches 86°, a January night drops to 9°, and about 31 inches of snow falls in a normal winter. Colder January nights than 94% of U.S. towns; hotter July afternoons than 52% of U.S. towns.
How cold does it get in Riverside Township in winter?
January nights average 9°. About 164 nights a year reach 32° or below and 24 reach 0° or below. In the coldest January of the last 30 years the month averaged 10°.
How much snow does Riverside Township get?
About 31 inches in a normal winter at Centerville 6 Se, SD, most of it in February and December, with snow on the ground about 68 days a year.
How hot does it get in Riverside Township?
July, with a typical high of 86° and a low of 63°. About 18 days a year reach 90° (Centerville 6 Se, SD).
When is the first and last frost in Riverside Township?
In half of years the last spring frost (32°) comes by May 2 and the first fall frost by October 1, about 151 frost-free days, at Centerville 6 Se, SD.
What growing zone is Riverside Township in?
Zone 5a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −19°.
What is the best time of year to visit Riverside Township?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, August and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Riverside Township getting warmer?
Yes: 1991–2020 averaged 0.9° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 85% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Riverside 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.