Few U.S. towns have colder winter nights than Harrold
Peak summer warmth arrives in July, with afternoons near 86°. Precipitation is light here, less than falls on 89% of U.S. towns. Since 1901–2000, the year has warmed by 0.9°, most of all in January. The frost-free window for a garden runs roughly May 12 to October 1.
A year in Harrold at a glance
Each month’s typical high and low, and what it brings.
What stands out about Harrold’s climate
Compared with towns across the U.S., with Harrold’s place in South Dakota beside it.
What a year in Harrold feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 142 frost-free days a year
In half of years the last 32° night comes by May 12 and the first by October 1. Frost and day counts come from NOAA’s station at Highmore 1 W, SD, 14 miles from the town’s center, at about the same height.
The 2023 USDA map puts Harrold’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 43 inches of snow a winter
Snow, measured at Blunt, SD, falls mostly in February and December. Precipitation (rain plus melted snow) adds up to 20 inches a year; June is the wettest month and January the driest. Rain or snow falls on about 81 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Harrold
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 Highmore 1 W, SD.
Living with Harrold’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
142 frost-free days in zone 4b. The last frost comes by May 12 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 Harrold from natural hazards, river flooding is the largest share (64%); heat waves, cold waves, winter storms and ice storms together are 14%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Harrold and similar climates
TownRatings has no climate map of the towns around Harrold yet.
Climates most like Harrold’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 |
|---|---|---|---|---|
| Harrold, SD | 6° | 86° | 20" | 43" |
| Watford City, ND | 4° | 84° | 16" | 50" |
| Havre, MT | 6° | 85° | 13" | 41" |
| Gypsum, CO | 11° | 86° | 14" | 39" |
| Alliance, NE | 13° | 88° | 17" | 45" |
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 Harrold averaged 0.9° warmer than the 1900s. The biggest change is in January (+3.3°).
A smaller shift than in 82% 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 Harrold compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Harrold’s place among South Dakota’s.
Harrold weather by month
Highs, lows and precipitation from NOAA’s grid at Harrold’s center; snow, wet days and snow on the ground from Blunt, SD. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 26° | 6° | 0.4" | 7.0" | 5 | 22 | 6° – 32° |
| February | 31° | 10° | 0.6" | 8.4" | 4 | 14 | 3° – 32° |
| March | 44° | 21° | 0.9" | 6.0" | 6 | 9 | 22° – 46° |
| April | 57° | 31° | 2.0" | 6.1" | 8 | 2 | 35° – 51° |
| May | 69° | 43° | 3.2" | 0.1" | 10 | 0 | 51° – 62° |
| June | 79° | 54° | 3.6" | 0.0" | 11 | 0 | 61° – 70° |
| July | 86° | 59° | 2.7" | 0.0" | 9 | 0 | 64° – 80° |
| August | 84° | 57° | 2.2" | 0.0" | 7 | 0 | 65° – 75° |
| September | 76° | 47° | 1.9" | 0.0" | 7 | 0 | 55° – 68° |
| October | 60° | 34° | 1.7" | 1.7" | 7 | 1 | 38° – 52° |
| November | 44° | 21° | 0.6" | 6.4" | 5 | 6 | 21° – 42° |
| December | 31° | 10° | 0.5" | 7.6" | 4 | 16 | 7° – 28° |
| Year | 57° | 33° | 20.3" | 43.3" | 81 | 70 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 3° to 32°. June is the most reliable, staying within 9°.
Where Harrold’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 Harrold’s center.
- Snow: Blunt, SD.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Highmore 1 W, SD, 14 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 Harrold’s climate
What is the weather like in Harrold?
A typical July afternoon reaches 86°, a January night drops to 6°, and about 43 inches of snow falls in a normal winter. Colder January nights than 98% of U.S. towns; hotter July afternoons than 57% of U.S. towns.
How cold does it get in Harrold in winter?
January nights average 6°. About 170 nights a year reach 32° or below and 28 reach 0° or below. In the coldest January of the last 30 years the month averaged 6°.
How much snow does Harrold get?
About 43 inches in a normal winter at Blunt, SD, most of it in February and December, with snow on the ground about 70 days a year.
How hot does it get in Harrold?
July, with a typical high of 86° and a low of 59°. About 24 days a year reach 90° and 3 reach 100° (Highmore 1 W, SD).
When is the first and last frost in Harrold?
In half of years the last spring frost (32°) comes by May 12 and the first fall frost by October 1, about 142 frost-free days, at Highmore 1 W, SD.
What growing zone is Harrold 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 Harrold?
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 Harrold getting warmer?
Yes: 1991–2020 averaged 0.9° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 82% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Harrold.
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.