Less rain and snow falls on Angostura than on 91% of U.S. towns: 18 inches a year
January mornings start at about 14°. The gap between a January night and a July afternoon is 76°. Winter nights are cold: in January they are colder than in 88% of U.S. towns. Seedlings are safe outdoors from about May 16, with the first autumn frost due around September 27.
A year in Angostura at a glance
Each month’s typical high and low, and what it brings.
What stands out about Angostura’s climate
Compared with towns across the U.S., with Angostura’s place in South Dakota beside it.
What a year in Angostura feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 133 frost-free days a year
In half of years the last 32° night comes by May 16 and the first by September 27. Frost and day counts come from NOAA’s station at Hot Springs, SD, 9 miles from the town’s center, 280 ft higher.
The 2023 USDA map puts Angostura’s center in zone 5a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −18°. 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 32 inches of snow a winter
Snow, measured at Hot Springs, SD, falls mostly in February. 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 78 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Angostura
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 Hot Springs, SD.
Living with Angostura’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
133 frost-free days in zone 5a. The last frost comes by May 16 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 27.
Months with highs of 62–84° and lows of 40° or more: May, June and September. 5.1 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Angostura from natural hazards, river flooding is the largest share (40%); heat waves, cold waves, winter storms and ice storms together are 9%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Angostura and similar climates
TownRatings has no climate map of the towns around Angostura yet.
Climates most like Angostura’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 |
|---|---|---|---|---|
| Angostura, SD | 14° | 89° | 18" | 32" |
| Sidney, NE | 15° | 89° | 17" | 29" |
| Providence, UT | 15° | 89° | 19" | 44" |
| Sheridan, WY | 11° | 89° | 15" | 33" |
| Lockwood, MT | 15° | 88° | 15" | 35" |
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 Angostura averaged 1.4° warmer than the 1900s. The biggest change is in January (+4.0°).
A bigger shift than in 54% 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 Angostura compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Angostura’s place among South Dakota’s.
Angostura weather by month
Highs, lows and precipitation from NOAA’s grid at Angostura’s center; snow, wet days and snow on the ground from Hot Springs, SD. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 38° | 14° | 0.4" | 5.2" | 4 | 12 | 17° – 37° |
| February | 41° | 15° | 0.6" | 6.3" | 5 | 9 | 14° – 38° |
| March | 52° | 24° | 1.0" | 5.6" | 6 | 5 | 26° – 48° |
| April | 60° | 32° | 2.0" | 4.7" | 8 | 2 | 39° – 52° |
| May | 70° | 42° | 3.2" | 0.4" | 11 | 0 | 49° – 61° |
| June | 81° | 52° | 3.1" | 0.0" | 10 | 0 | 61° – 72° |
| July | 89° | 59° | 2.5" | 0.0" | 8 | 0 | 66° – 79° |
| August | 88° | 57° | 1.8" | 0.0" | 7 | 0 | 67° – 77° |
| September | 79° | 47° | 1.4" | 0.1" | 5 | 0 | 57° – 68° |
| October | 63° | 34° | 1.4" | 1.7" | 6 | 1 | 40° – 54° |
| November | 49° | 23° | 0.5" | 2.5" | 4 | 4 | 27° – 46° |
| December | 39° | 14° | 0.4" | 5.5" | 4 | 10 | 18° – 34° |
| Year | 62° | 34° | 18.2" | 32.0" | 78 | 44 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 14° to 38°. August is the most reliable, staying within 9°.
Where Angostura’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 Angostura’s center.
- Snow: Hot Springs, SD.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Hot Springs, SD, 9 miles from the town’s center, 280 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 Angostura’s climate
What is the weather like in Angostura?
A typical July afternoon reaches 89°, a January night drops to 14°, and about 32 inches of snow falls in a normal winter. Colder January nights than 88% of U.S. towns; hotter July afternoons than 73% of U.S. towns.
How cold does it get in Angostura in winter?
January nights average 14°. About 176 nights a year reach 32° or below and 14 reach 0° or below. In the coldest January of the last 30 years the month averaged 17°.
How much snow does Angostura get?
About 32 inches in a normal winter at Hot Springs, SD, most of it in February, with snow on the ground about 44 days a year.
How hot does it get in Angostura?
July, with a typical high of 89° and a low of 59°. About 41 days a year reach 90° and 4 reach 100° (Hot Springs, SD).
When is the first and last frost in Angostura?
In half of years the last spring frost (32°) comes by May 16 and the first fall frost by September 27, about 133 frost-free days, at Hot Springs, SD.
What growing zone is Angostura in?
Zone 5a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −18°.
What is the best time of year to visit Angostura?
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 Angostura getting warmer?
Yes: 1991–2020 averaged 1.4° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 54% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Angostura.
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.