Ortley sits near the bottom of U.S. towns for winter warmth
The warmest part of a July day comes in at 80° on average. June is the wettest month here, with about 5.7 times the rain of January. In July, afternoons here are cooler than in 91% of U.S. towns. Plan time outside from May to September, when highs sit at 66–80°.
A year in Ortley at a glance
Each month’s typical high and low, and what it brings.
What stands out about Ortley’s climate
Compared with towns across the U.S., with Ortley’s place in South Dakota beside it.
What a year in Ortley feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 136 frost-free days a year
In half of years the last 32° night comes by May 14 and the first by September 28. Frost and day counts come from NOAA’s station at Summit 1 W, SD, 7 miles from the town’s center, 110 ft higher.
The 2023 USDA map puts Ortley’s center in zone 4b: the coldest night of a typical winter, averaged over 1991–2020, reaches about −24°. 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 59 inches of snow a winter
Snow, measured at Summit 1 W, SD, falls mostly in February and December. Precipitation (rain plus melted snow) adds up to 25 inches a year; June is the wettest month and January the driest. Rain or snow falls on about 93 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Ortley
95% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October through May.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Summit 1 W, SD.
Living with Ortley’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
136 frost-free days in zone 4b. The last frost comes by May 14 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Sep 28.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August and September. 2.2 miles of trails are waiting.
Parks & trails →Cold waves are 37% of the yearly building losses FEMA expects in Ortley from natural hazards, the largest share. Normals are averages; the hazards page covers the extremes.
Natural hazards →Ortley and its neighbors
Every town next door is within a degree of Ortley in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Ortley’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 |
|---|---|---|---|---|
| Ortley, SD | 2° | 80° | 25" | 59" |
| Baxter, MN | 1° | 80° | 29" | 48" |
| Kingsford, MI | 5° | 80° | 29" | 61" |
| Grand Forks, ND | −2° | 81° | 22" | 49" |
| Rice Lake, WI | 3° | 80° | 33" | 53" |
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 Ortley averaged 1.1° warmer than the 1900s. The biggest change is in January (+2.6°).
A smaller shift than in 74% 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 Ortley compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Ortley’s place among South Dakota’s.
Ortley weather by month
Highs, lows and precipitation from NOAA’s grid at Ortley’s center; snow, wet days and snow on the ground from Summit 1 W, SD. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 19° | 2° | 0.7" | 10.2" | 6 | 28 | −3° – 23° |
| February | 24° | 6° | 0.7" | 12.4" | 6 | 24 | 1° – 26° |
| March | 37° | 18° | 1.1" | 8.8" | 6 | 18 | 18° – 42° |
| April | 52° | 31° | 2.2" | 7.8" | 8 | 6 | 31° – 50° |
| May | 66° | 43° | 3.2" | 0.1" | 11 | 0 | 50° – 62° |
| June | 75° | 55° | 3.9" | 0.0" | 11 | 0 | 60° – 69° |
| July | 80° | 59° | 3.8" | 0.0" | 9 | 0 | 61° – 76° |
| August | 78° | 57° | 2.6" | 0.0" | 9 | 0 | 62° – 71° |
| September | 70° | 48° | 2.5" | 0.0" | 8 | 0 | 53° – 64° |
| October | 55° | 35° | 2.4" | 2.0" | 8 | 1 | 37° – 50° |
| November | 38° | 21° | 0.8" | 5.4" | 5 | 8 | 17° – 40° |
| December | 24° | 9° | 0.7" | 11.9" | 7 | 23 | 2° – 24° |
| Year | 52° | 32° | 24.5" | 58.6" | 93 | 107 |
How much a month can swing
A normal is an average. January swings the most: from 1991 to 2020 its average ranged from -3° to 23°. August is the most reliable, staying within 9°.
Where Ortley’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 Ortley’s center.
- Snow: Summit 1 W, SD.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Summit 1 W, SD, 7 miles from the town’s center, 110 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 Ortley’s climate
What is the weather like in Ortley?
A typical July afternoon reaches 80°, a January night drops to 2°, and about 59 inches of snow falls in a normal winter. Colder January nights than all but 81 U.S. towns; cooler July afternoons than 91% of U.S. towns.
How cold does it get in Ortley in winter?
January nights average 2°. About 180 nights a year reach 32° or below and 39 reach 0° or below. In the coldest January of the last 30 years the month averaged −3°.
How much snow does Ortley get?
About 59 inches in a normal winter at Summit 1 W, SD, most of it in February and December, with snow on the ground about 107 days a year.
How hot does it get in Ortley?
July, with a typical high of 80° and a low of 59°. About 7 days a year reach 90° (Summit 1 W, SD).
When is the first and last frost in Ortley?
In half of years the last spring frost (32°) comes by May 14 and the first fall frost by September 28, about 136 frost-free days, at Summit 1 W, SD.
What growing zone is Ortley in?
Zone 4b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −24°.
What is the best time of year to visit Ortley?
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 Ortley getting warmer?
Yes: 1991–2020 averaged 1.1° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 74% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Ortley.
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.