Astoria, South Dakota climate: Normal weather by month, frost dates and records
Astoria's normal year runs from 3°F January nights to 80°F July afternoons. (NOAA 1991-2020 normals)
In metric: a yearly mean of 5.8°C, January lows of −16°C, July highs of 27°C.
- NOAA stationAstoria (4 mi S)
- Station IDUSC00390422
- Location44.50°N 96.53°W
- Elevation1,890 ft (576 m)
- From the center4 miles
- Population130
On October 22, the normal high in Astoria is 53°F and the normal low 33°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Astoria.
- Jan 20° 3°
- Feb 25° 7°
- Mar 37° 19°
- Apr 52° 32°
- May 65° 44°
- Jun 75° 55°
- Jul 80° 60°
- Aug 78° 58°
- Sep 70° 49°
- Oct 56° 36°
- Nov 40° 22°
- Dec 26° 10°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Astoria each month?
July is the warmest month, with normal highs of 80°F; January the coldest, with normal lows of 3°F.
| Month | High | Low | Mean | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|
| January | 20°F | 3°F | 11.8°F | – | <1 | 31 | 9 h 10 min |
| February | 25°F | 7°F | 16.0°F | – | <1 | 28 | 10 h 30 min |
| March | 37°F | 19°F | 28.2°F | – | <1 | 27 | 11 h 50 min |
| April | 52°F | 32°F | 41.9°F | – | <1 | 15 | 13 h 30 min |
| May | 65°F | 44°F | 54.9°F | – | <1 | 3 | 14 h 50 min |
| June | 75°F | 55°F | 65.2°F | – | 1 | <1 | 15 h 30 min |
| July | 80°F | 60°F | 69.9°F | – | 3 | <1 | 15 h 20 min |
| August | 78°F | 58°F | 67.8°F | – | 2 | <1 | 14 h 10 min |
| September | 70°F | 49°F | 59.5°F | – | 1 | 1 | 12 h 40 min |
| October | 56°F | 36°F | 45.7°F | – | <1 | 11 | 11 h |
| November | 40°F | 22°F | 30.7°F | – | <1 | 25 | 9 h 40 min |
| December | 26°F | 10°F | 17.9°F | – | <1 | 31 | 8 h 50 min |
| Year (annual) | 52°F | 33°F | 42.4°F | – | 6 | 170 |
The same normals in °C and millimetres
| Month | High | Low | Mean |
|---|---|---|---|
| January | −6°C | −16°C | −11.2°C |
| February | −4°C | −14°C | −8.9°C |
| March | 3°C | −7°C | −2.1°C |
| April | 11°C | 0°C | 5.5°C |
| May | 19°C | 7°C | 12.7°C |
| June | 24°C | 13°C | 18.4°C |
| July | 27°C | 15°C | 21.1°C |
| August | 25°C | 14°C | 19.9°C |
| September | 21°C | 9°C | 15.3°C |
| October | 13°C | 2°C | 7.6°C |
| November | 4°C | −6°C | −0.7°C |
| December | −4°C | −12°C | −7.8°C |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Brookings (17 miles away), gets 36 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00390422; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Astoria?
Normal highs sit between 65°F and 85°F in May, June, July, August and September.
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.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00390422.
When is the last frost in Astoria?
In Astoria, the last spring frost (32°F) comes after May 6 in half of years and after May 20 in one year in ten; the first autumn frost comes before October 3 in half of years and before September 20 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- May 61 year in 10 after May 20; 9 in 10 after April 23
- First autumn frost, half of years before
- October 31 year in 10 before September 20; 9 in 10 before October 17
NOAA puts the median frost-free season at 150 days, and the season without a hard freeze (28°F) at 169 days.
A hard freeze (28°F) comes after April 27 in half of springs and before October 13 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Astoria in zone 4b in ZIP code 57213, the nearest ZIP area.
Frost dates for every NOAA station in South Dakota · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00390422; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get in Astoria?
In a normal year in Astoria, 6 days a year reach 90°F and 170 nights fall to 32°F or colder.
- Days at 90°F or more
- 6a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 170a normal year
- Days that stay below freezing
- 86high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USC00390422.
How sunny is Astoria?
Over a year 75% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Astoria, 4.0 kWh per square metre a day. July is the sunniest month (84%) and December the cloudiest (67%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 77% | 2.0 |
| February | 80% | 3.1 |
| March | 70% | 3.8 |
| April | 70% | 4.8 |
| May | 70% | 5.6 |
| June | 76% | 6.3 |
| July | 84% | 6.7 |
| August | 80% | 5.5 |
| September | 78% | 4.3 |
| October | 72% | 2.9 |
| November | 71% | 1.9 |
| December | 67% | 1.4 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Astoria need?
A normal year in Astoria brings 8,617 heating degree days, 60% more than the median U.S. place (5,373), and 441 cooling degree days, 51% fewer than the median (908). Eight months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 2,253 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,649 | 0 |
| February | 1,372 | 0 |
| March | 1,141 | 0 |
| April | 692 | 1 |
| May | 328 | 15 |
| June | 80 | 86 |
| July | 21 | 172 |
| August | 38 | 124 |
| September | 205 | 41 |
| October | 600 | 2 |
| November | 1,031 | 0 |
| December | 1,462 | 0 |
| Year (annual) | 8,617 | 441 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00390422. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
How does Astoria's climate compare?
Astoria is warmer than 3 of the other 99 places with their own NOAA record in South Dakota. Across the 7,247 U.S. stations with normals, its annual mean of 42.4°F is warmer than 10%.
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers.
Which places near Astoria share this climate record?
8 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.
- Tyler, MN1,102 people · 25 mi SE
- Lake Benton, MN678 people · 20 mi SE
- Hendricks, MN603 people · 5 mi E
- White, SD554 people · 7 mi SW
- Ivanhoe, MN542 people · 14 mi E
- Toronto, SD195 people · 7 mi NW
- Arco, MN85 people · 19 mi SE
- Norfeld Colony, SD0 people · 6 mi S
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Astoria's climate
What is the coldest month in Astoria?
January, with a normal high of 20°F and a normal low of 3°F. The warmest is July (80°F by day, 60°F at night).
Does it snow in Astoria?
Yes. NOAA publishes no 1991-2020 snowfall normal for Astoria's NOAA station; the nearest record that keeps one, Brookings (17 miles away), records 36 inches of snow in a normal year.
What plant hardiness zone is Astoria in?
The USDA's 2023 map puts Astoria in zone 4b in ZIP code 57213, the nearest ZIP area.
How late can frost come in Astoria?
In half of years the last 32°F night comes after May 6; in one year in ten it comes after May 20. Waiting until May 20 leaves about a one-in-ten chance of a later frost.
Nearby and next
- South Dakota climateThe statewide normals and every place in the state
- Brookings, SD17 miles from this station, 43.3°F a year
- Clear Lake, SD19 miles from this station, 42.4°F a year
- Canby, MN20 miles from this station, 44.7°F a year
- Castlewood, SD29 miles from this station, 42.7°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made