Tackett Underwood Building · Photo: Ammodramus · CC0Winter nights in Gregory are colder than in 91% of U.S. towns
July afternoons average 87°. June is the wettest month, January the driest. It is a dry place: less rain and snow fall here than on 88% of U.S. towns. Plan time outside for May, June and September, when highs sit at 69–79°.
A year in Gregory at a glance
Each month’s typical high and low, and what it brings.
What stands out about Gregory’s climate
Compared with towns across the U.S., with Gregory’s place in South Dakota beside it.
What a year in Gregory feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 149 frost-free days a year
In half of years the last 32° night comes by May 6 and the first by October 3. Frost and day counts come from NOAA’s station at Gregory, SD, 0.7 miles from the town’s center, at about the same height.
The 2023 USDA map puts Gregory’s center in zone 5a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −17°. 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 45 inches of snow a winter
Snow, measured at Gregory, 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 77 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Gregory
90% 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 Gregory, SD.
Living with Gregory’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
149 frost-free days in zone 5a. The last frost comes by May 6 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 3.
Months with highs of 62–84° and lows of 40° or more: May, June and September.
Parks & trails →Cold waves are 47% of the yearly building losses FEMA expects in Gregory from natural hazards, the largest share. Normals are averages; the hazards page covers the extremes.
Natural hazards →Gregory and similar climates
TownRatings has no climate map of the towns around Gregory yet.
Climates most like Gregory’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 |
|---|---|---|---|---|
| Gregory, SD | 12° | 87° | 24" | 45" |
| Schuyler, NE | 13° | 87° | 29" | 36" |
| Sioux City, IA | 10° | 86° | 29" | 36" |
| Air Force Academy, CO | 14° | 84° | 21" | 55" |
| 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 Gregory averaged 1.2° warmer than the 1900s. The biggest change is in January (+3.5°).
A smaller shift than in 65% 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 Gregory compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Gregory’s place among South Dakota’s.
Gregory weather by month
Highs, lows and precipitation from NOAA’s grid at Gregory’s center; snow, wet days and snow on the ground from Gregory, SD. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | 30-yr range |
|---|---|---|---|---|---|---|
| January | 32° | 12° | 0.5" | 6.8" | 3 | 14° – 37° |
| February | 36° | 15° | 0.7" | 8.5" | 4 | 12° – 35° |
| March | 47° | 24° | 1.2" | 5.3" | 5 | 24° – 49° |
| April | 58° | 33° | 2.8" | 5.4" | 8 | 37° – 52° |
| May | 69° | 45° | 3.8" | 0.0" | 10 | 52° – 63° |
| June | 79° | 56° | 4.0" | 0.0" | 10 | 63° – 72° |
| July | 87° | 61° | 2.9" | 0.0" | 7 | 66° – 81° |
| August | 85° | 59° | 2.9" | 0.0" | 7 | 66° – 76° |
| September | 76° | 50° | 2.3" | 0.0" | 6 | 58° – 69° |
| October | 61° | 37° | 1.9" | 1.7" | 6 | 41° – 54° |
| November | 46° | 25° | 0.8" | 6.9" | 4 | 25° – 44° |
| December | 34° | 15° | 0.6" | 10.4" | 4 | 13° – 31° |
| Year | 59° | 36° | 24.2" | 45.0" | 77 |
How much a month can swing
A normal is an average. March swings the most: from 1991 to 2020 its average ranged from 24° to 49°. August is the most reliable, staying within 10°.
Where Gregory’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 Gregory’s center.
- Snow: Gregory, SD (NOAA station in town).
- Frost, freezing nights, 90° and 100° days, heating and cooling: Gregory, SD, 0.7 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 Gregory’s climate
What is the weather like in Gregory?
A typical July afternoon reaches 87°, a January night drops to 12°, and about 45 inches of snow falls in a normal winter. Colder January nights than 91% of U.S. towns; hotter July afternoons than 60% of U.S. towns.
How cold does it get in Gregory in winter?
January nights average 12°. About 165 nights a year reach 32° or below and 19 reach 0° or below. In the coldest January of the last 30 years the month averaged 14°.
How much snow does Gregory get?
About 45 inches in a normal winter at Gregory, SD, most of it in December.
How hot does it get in Gregory?
July, with a typical high of 87° and a low of 61°. About 29 days a year reach 90° and 3 reach 100° (Gregory, SD).
When is the first and last frost in Gregory?
In half of years the last spring frost (32°) comes by May 6 and the first fall frost by October 3, about 149 frost-free days, at Gregory, SD.
What growing zone is Gregory in?
Zone 5a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −17°.
What is the best time of year to visit Gregory?
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 Gregory getting warmer?
Yes: 1991–2020 averaged 1.2° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 65% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Gregory.
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.