Armour, South Dakota climate: Normal weather by month, frost dates and records

What is the weather like in Armour each month?

July is the warmest month, with normal highs of 88°F; January the coldest, with normal lows of 10°F. The most precipitation falls in May (4.03 in), the least in January (0.55 in).

When is the best weather to visit Armour?

Normal highs sit between 65°F and 85°F in May, June and September. Of those, September has the fewest days with rain (6).

That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.

When is the last frost in Armour?

In Armour, the last spring frost (32°F) comes after May 3 in half of years and after May 18 in one year in ten; the first autumn frost comes before October 6 in half of years and before September 23 in one year in ten.

Last spring frost, half of years after

May 31 year in 10 after May 18; 9 in 10 after April 17

First autumn frost, half of years before

October 61 year in 10 before September 23; 9 in 10 before October 21

NOAA puts the median frost-free season at 157 days, and the season without a hard freeze (28°F) at 176 days.

A hard freeze (28°F) comes after April 21 in half of springs and before October 16 in half of autumns.

The USDA's 2023 Plant Hardiness Zone Map puts Armour in zone 5a in ZIP code 57313, the nearest ZIP area.

Frost dates for every NOAA station in South Dakota · Frost dates by ZIP code

How hot and how cold does it get in Armour?

In a normal year in Armour, 33 days a year reach 90°F (3 of them 100°F or more), 156 nights fall to 32°F or colder and 76 days bring measurable precipitation.

Days at 90°F or more

33a normal year

Days at 100°F or more

3a normal year

Nights at 32°F or colder

156a normal year

Days that stay below freezing

49high of 32°F or less

Days with 0.01 inch of precipitation

76a normal year

Days with 1 inch of snow or more

11a normal year

The highest temperature in this station's record (since 1896) is 116°F, on July 24, 1940; the lowest is −45°F, on January 12, 1912.

The wettest calendar year on that record is 1962, with 37.14 in; the snowiest season is 2000–01, with 69.3 inches.

How sunny is Armour?

Over a year 77% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Armour, 4.2 kWh per square metre a day. July is the sunniest month (86%) and December the cloudiest (70%).

How much heating and cooling does Armour need?

A normal year in Armour brings 6,747 heating degree days, 26% more than the median U.S. place (5,373), and 929 cooling degree days, 2% more than the median (908). Seven months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 3,160 growing degree days a year above 50°F.

Which places near Armour share this climate record?

6 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.

• Parkston, SD1,542 people · 19 mi E
• Corsica, SD556 people · 8 mi N
• Delmont, SD154 people · 10 mi E
• Harrison, SD6 people · 12 mi NW
• New Holland, SD4 people · 15 mi NW
• Lakeview Colony, SD0 people · 8 mi SW

Nearby and next

• South Dakota climateThe statewide normals and every place in the state
• Wagner, SD16 miles from this station, 49.8°F a year
• Pickstown, SD19 miles from this station, 49.0°F a year
• White Lake, SD30 miles from this station, 46.1°F a year
• Tyndall, SD33 miles from this station, 47.3°F a year
• Compare two placesMonth by month, side by side

Download these normals (CSV) · JSON · How these figures are made