Nisland has colder winter nights than 92% of U.S. towns
Sunny July days climb to about 88°. Its yearly precipitation falls short of 91% of U.S. towns. The latest 30-year average runs 1.2° warmer than 1901–2000’s, with January up the most. Picnics, hikes and garden evenings suit May, June and September, with highs of 68–79°.
A year in Nisland at a glance
Each month’s typical high and low, and what it brings.
What stands out about Nisland’s climate
Compared with towns across the U.S., with Nisland’s place in South Dakota beside it.
What a year in Nisland feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 144 frost-free days a year
In half of years the last 32° night comes by May 8 and the first by October 1. Frost and day counts come from NOAA’s station at Newell, SD, 7 miles from the town’s center, at about the same height.
The 2023 USDA map puts Nisland’s center in zone 4b: the coldest night of a typical winter, averaged over 1991–2020, reaches about −21°. 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 Newell, SD, falls mostly in December. Precipitation (rain plus melted snow) adds up to 18 inches a year; May is the wettest month and January the driest. Rain or snow falls on about 67 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Nisland
93% 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 Newell, SD.
Living with Nisland’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
144 frost-free days in zone 4b. The last frost comes by May 8 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 and September.
Parks & trails →Of the yearly building losses FEMA expects in Nisland from natural hazards, river flooding is the largest share (50%); heat waves, cold waves, winter storms and ice storms together are 16%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Nisland and similar climates
TownRatings has no climate map of the towns around Nisland yet.
Climates most like Nisland’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 |
|---|---|---|---|---|
| Nisland, SD | 11° | 88° | 18" | 40" |
| Alliance, NE | 13° | 88° | 17" | 45" |
| Sheridan, WY | 11° | 89° | 15" | 33" |
| Glenwood Springs, CO | 14° | 87° | 15" | 39" |
| Providence, UT | 15° | 89° | 19" | 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 Nisland averaged 1.2° warmer than the 1900s. The biggest change is in January (+3.3°).
A smaller shift than in 61% 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 Nisland compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Nisland’s place among South Dakota’s.
Nisland weather by month
Highs, lows and precipitation from NOAA’s grid at Nisland’s center; snow, wet days and snow on the ground from Newell, SD. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 34° | 11° | 0.5" | 4.7" | 4 | 17 | 13° – 35° |
| February | 38° | 14° | 0.6" | 5.1" | 4 | 10 | 6° – 37° |
| March | 48° | 22° | 1.0" | 7.2" | 5 | 8 | 22° – 47° |
| April | 58° | 32° | 2.0" | 6.5" | 7 | 3 | 38° – 52° |
| May | 68° | 42° | 3.4" | 1.1" | 9 | 0 | 47° – 61° |
| June | 79° | 52° | 3.0" | 0.0" | 9 | 0 | 60° – 72° |
| July | 88° | 58° | 2.1" | 0.0" | 8 | 0 | 65° – 79° |
| August | 86° | 56° | 1.6" | 0.0" | 6 | 0 | 66° – 76° |
| September | 77° | 46° | 1.3" | 0.0" | 4 | 0 | 55° – 68° |
| October | 61° | 33° | 1.6" | 2.8" | 5 | 1 | 39° – 53° |
| November | 47° | 22° | 0.7" | 4.2" | 3 | 4 | 23° – 43° |
| December | 36° | 13° | 0.5" | 8.2" | 4 | 12 | 15° – 33° |
| Year | 60° | 33° | 18.2" | 39.8" | 67 | 54 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 6° to 37°. August is the most reliable, staying within 11°.
Where Nisland’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 Nisland’s center.
- Snow: Newell, SD.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Newell, SD, 7 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 Nisland’s climate
What is the weather like in Nisland?
A typical July afternoon reaches 88°, a January night drops to 11°, and about 40 inches of snow falls in a normal winter. Colder January nights than 92% of U.S. towns; hotter July afternoons than 67% of U.S. towns.
How cold does it get in Nisland in winter?
January nights average 11°. About 178 nights a year reach 32° or below and 23 reach 0° or below. In the coldest January of the last 30 years the month averaged 13°.
How much snow does Nisland get?
About 40 inches in a normal winter at Newell, SD, most of it in December, with snow on the ground about 54 days a year.
How hot does it get in Nisland?
July, with a typical high of 88° and a low of 58°. About 30 days a year reach 90° and 4 reach 100° (Newell, SD).
When is the first and last frost in Nisland?
In half of years the last spring frost (32°) comes by May 8 and the first fall frost by October 1, about 144 frost-free days, at Newell, SD.
What growing zone is Nisland in?
Zone 4b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −21°.
What is the best time of year to visit Nisland?
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 Nisland getting warmer?
Yes: 1991–2020 averaged 1.2° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 61% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Nisland.
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.