Flandreau, SD Climate: Temperature & Rain by Month
Explore NOAA NCEI's 1991–2020 climate normals → and a clearly labeled PlainClimate comfort calculation
30-year climate normals (1991-2020) from Flandreau's primary NOAA station, FLANDREAU.
The climate verdict for Flandreau
Winter sets the terms in Flandreau, South Dakota. A pronounced 57.5°F seasonal swing and heating demand above twice the cooling total frame an annual average of 43°F. At 49/100 (moderate) the climate comfort score falls in the bottom third of the station-mapped U.S. score corpus, exceeding only 18% of scores.
- 43°F
- annual average temperature (NOAA normal)
- 49/100
- comfort score, above 18% of station-mapped location scores
- 28.5"
- annual precipitation · 40" snow
- 149 days
- frost-free growing season
Flandreau: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00392984 · Flandreau, SD 43°F mean · 28.5" precip
TEMP-COOL · RANK-COOL · PHOTO-FINISH · PRCP-MID · SWING-WIDE · COMF-LOW · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 43°F
- RANK-COOL #892
- PHOTO-FINISH ≈ Richardton Abbey
- PRCP-MID 28.5"
- SWING-WIDE 58°F
- COMF-LOW 49/100
- LOAD-HEAT 8,376 HDD
- STN-1 USC00392984
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Richardton Abbey, ND (+ 0 °F mean)
Instrument codes from this station's NOAA 1991–2020 normals, mean temperature, corpus warmth rank, photo-finish peer station, precipitation band, seasonal swing, comfort composite, degree-day load, and field book, not a livability rating.
Mean-temperature neighbourhood
Nationwide NOAA normal poles and nearest peers, not a reprint of every SD station list.
- Flandreau (this station) 43°F
- Hot Williston, ND 43°F
- Near Richardton Abbey, ND 43°F
- Near Culbertson, MT 43°F
- Near Glenwood, MN 43°F
Climate Living Index · Flandreau
Flandreau: 31/100 · grade F
Flandreau publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 1 missing weight rescale to 100.
PlainClimate-derived for Flandreau, not an official NOAA rating. Rankings still use Comfort Score 49/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Precipitation balance | 28.5 in · 6.5 from 35 in | 77/100 · B |
| Snowfall burden | 40.4 inches/year | 27/100 · F |
| Normal heat + freeze calendar | 180 calendar days | 25/100 · F |
| Frost-free season | 149 days/year | 24/100 · F |
| Annual temperature balance | 43.3°F · 24.2° from 67.5°F | 14/100 · F |
Flandreau · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Flandreau is a continental Köppen climate: Dfb
Coldest-month mean 13.1°F and warmest-month mean 70.6°F place this station in continental, no dry season, warm summer climates (Dfb). Class Dfb is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: continental, specifically continental, no dry season, warm summer.
- Köppen code
- Dfb
- Group
- Continental
- Warmest month
- 70.6°F
- Coldest month
- 13.1°F
Source: official public datasets monthly normals (1991–2020) at the city’s primary station. This is a station classification, not a mapped regional consensus.
National standing · heating-led station
Where Flandreau sits across the climate record
Three NOAA fields for Flandreau's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Cooler than 87%
- Among 6,861 stations, Flandreau sits in the cooler third of annual means.
- Annual precipitation
- 38th percentile wetness
- Neither arid nor torrential versus 6,352 station totals.
- Seasonal temperature swing
- Wider than 95%
- Warmest-to-coldest month gap for Flandreau is large versus 6,861 complete station-years.
How Flandreau compares across U.S. station-mapped locations
Flandreau's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
49 18th percentile score exceeds 18% of 6,189 station-mapped location scores
- 0–10: 0 station-mapped locations (0%). Below this entry.
- 10–20: 0 station-mapped locations (0%). Below this entry.
- 20–30: 96 station-mapped locations (2%). Below this entry.
- 30–40: 280 station-mapped locations (5%). Below this entry.
- 40–50: 1,113 station-mapped locations (18%). This entry sits in this band.
- 50–60: 1,329 station-mapped locations (21%). Above this entry.
- 60–70: 1,236 station-mapped locations (20%). Above this entry.
- 70–80: 650 station-mapped locations (11%). Above this entry.
- 80–90: 921 station-mapped locations (15%). Above this entry.
- 90–100: 564 station-mapped locations (9%). Above this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Flandreau's measured station temperature trend
MethodologyAcross 96 complete annual observations from 1893 to 2025, FLANDREAU warmed at a fitted rate of 0.15°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- Flandreau primary station fitted change +0.15 °C/decade
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 23°F (-5°C) | 4°F (-16°C) | 13°F (-10°C) | 0.5" | 5.8" | 30.9 | 0.0 |
| February | 28°F (-2°C) | 7°F (-14°C) | 17°F (-8°C) | 0.8" | 8.2" | 27.6 | 0.0 |
| March | 40°F (4°C) | 19°F (-7°C) | 30°F (-1°C) | 1.3" | 6.2" | 27.3 | 0.0 |
| April | 54°F (12°C) | 31°F (0°C) | 43°F (6°C) | 2.7" | 4.8" | 16.3 | 0.0 |
| May | 67°F (19°C) | 45°F (7°C) | 56°F (13°C) | 4.1" | 0.1" | 2.4 | 0.6 |
| June | 77°F (25°C) | 56°F (13°C) | 66°F (19°C) | 4.5" | 0.0" | 0.0 | 1.8 |
| July | 81°F (27°C) | 60°F (16°C) | 71°F (21°C) | 3.8" | 0.0" | 0.0 | 3.7 |
| August | 79°F (26°C) | 57°F (14°C) | 68°F (20°C) | 3.6" | 0.0" | 0.0 | 1.9 |
| September | 72°F (22°C) | 48°F (9°C) | 60°F (16°C) | 3.1" | 0.0" | 1.4 | 0.5 |
| October | 58°F (15°C) | 34°F (1°C) | 46°F (8°C) | 2.2" | 1.2" | 13.9 | 0.0 |
| November | 41°F (5°C) | 21°F (-6°C) | 31°F (0°C) | 1.0" | 5.6" | 26.4 | 0.0 |
| December | 28°F (-2°C) | 10°F (-12°C) | 19°F (-7°C) | 0.8" | 8.5" | 30.8 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 82°F around July 16, short of 90°F on every date, while 180 dates carry a normal low at or below freezing, the coldest 3°F near January 19.
The freezing stretch
The normal low stays at or below 32°F into April 17, then returns to freezing around October 21, covering 180 dates in all.
Derived from the normal daily minimum. This is a different measure from the 50%-probability frost dates shown elsewhere on this page, which come from NOAA’s frost product.
Where the wet dates fall
The likeliest wet date is May 31, when 35% of years recorded at least a hundredth of an inch. The driest is November 8 at 16%. Summed across the calendar, that is about 82 wet dates a year.
The widest day
September 27 carries the biggest normal gap between afternoon and dawn, 25°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Flandreau.
Where Flandreau Stands Nationally
Freezing is routine here by normals standards — the normal low reaches 32°F or colder on about 180 nights a year, more than most ranked stations.
Flandreau earns one nationally notable standing (outer quintile) against 6,860 NOAA 1991–2020 normals stations, middle-of-the-pack metrics stay silent here.
Monthly Precipitation
Average monthly rainfall and snowfall
Snow: 5.8"
5.4 days with precipitation
Snow: 8.2"
5.6 days with precipitation
Snow: 6.2"
5.9 days with precipitation
Snow: 4.8"
7.9 days with precipitation
Snow: 0.1"
10.0 days with precipitation
9.8 days with precipitation
7.5 days with precipitation
7.1 days with precipitation
6.3 days with precipitation
Snow: 1.2"
5.9 days with precipitation
Snow: 5.6"
4.5 days with precipitation
Snow: 8.5"
5.7 days with precipitation
Flandreau runs a summer-peaked wet season
42% of Flandreau's yearly precipitation falls in June, July and August alone, against the 25% an evenly spread year would give those three months. The wettest month is June at 4.5", on a wide 57.5°F gap between its warmest and coldest month. Warm-season convection and, across the Southwest, the North American monsoon produce this shape: rain arrives in short heavy bursts during the hottest part of the year rather than as long cool-season soaking.
- Wettest three months: June, May, July, taking 44% of the annual total between them.
- Driest month: January at 0.5".
- Winter share: 8% falls in December, January and February.
Shares are computed from this station's own 1991-2020 monthly precipitation normals. A summer-peaked label means the June-August share reaches 35%; it describes timing across an average year, not any single season, and says nothing about how heavy an individual storm can be.
How Flandreau's precipitation splits across the calendar
About 82 days a year record measurable precipitation here, carrying 28.5" between them, or roughly 0.35 inches on a typical wet day. That sits in the middle band: neither the many-light-days pattern of the Pacific Northwest and the Great Lakes, nor the few-heavy-events pattern of the Gulf and the desert Southwest.
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year and say nothing about the heaviest single storm on record.
Winter brings real snow to Flandreau
Flandreau averages 40.4 inches of snowfall a year, with December the snowiest month on the normals, spread across roughly 24 days that record measurable snow. That is depth accumulating on the ground, which is why it can exceed the annual precipitation figure: precipitation counts the liquid the snow melts down to, and fresh snow is mostly air.
- Annual snowfall: 40.4 inches of depth.
- Days recording measurable snow: about 24 a year.
- At a rough ten-to-one melt ratio, snow accounts for on the order of 14% of the year's precipitation.
NOAA 1991-2020 normals. The ten-to-one ratio is a convention, not a measurement: real ratios vary with temperature, so treat the share as an order of magnitude rather than an exact split.
Frost Dates & Growing Season
First Fall Freeze
October 1
50% probability date
Last Spring Freeze
May 5
50% probability date
Growing Season
149 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
8,376
Higher = more heating needed
Cooling Degree Days
512
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside SD closest to Flandreau on two NOAA annual-normal axes (mean temperature and annual precipitation). Chip rows use distinct link sets.
Closest by average temperature
Nearest out-of-state peers by annual mean temperature (43°F here).
- Bloomer, WI 43°F · 0.0°F off
- Cascade, ID 43°F · 0.0°F off
- Culbertson, MT 43°F · 0.0°F off
- Glenwood, MN 43°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (28.5" here), excluding temperature-peer places.
- Central City, NE 28.5" · 0.0" off
- Plummer, ID 28.5" · 0.0" off
- Cloudcroft, NM 28.4" · 0.0" off
- San Saba, TX 28.6" · 0.1" off
Snow and freeze rhythm
When cold and snow define Flandreau
heating led · moderate · high swing
Winter and seasonal range jointly define this record. Flandreau logs 8,376 heating degree days, more than twice its 512 cooling total, while the typical coldest-to-warmest-month gap reaches 57.5°F. The annual mean therefore compresses two materially different seasons.
Only about 149 days are frost-free in a normal year. That short interval is consistent with the cold-season signal, but the measure does not predict the exact first or last freeze in any one year.
-
1. Flandreau coldest normal
January
Averaging 13°F (-10°C), this month sits below freezing for the month as a whole, not merely overnight.
-
2. Flandreau typical freeze period
January through December
The station reports average freezing days from January through December.
-
3. Flandreau snow peak
December
Flandreau averages 40.4 inches of snow a year, with December the snowiest month on the normals.
Questions about Flandreau's climate
How much snow does Flandreau get? ▼
How cold does Flandreau get in winter? ▼
How much energy does heating and cooling require in Flandreau? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Flandreau's primary station: FLANDREAU (USC00392984). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The 2024 Census Gazetteer identifies the exact name-and-state match as an incorporated place (GEOID 4621540). Match rule for Flandreau: exact normalized name + state only, no fuzzy expansion, so nearby differently spelled facilities stay unmatched.
On this page every temperature, precipitation, and derived score for Flandreau comes from its primary NOAA station record. No figure on this page is typed in by an editor - each value is rendered from NOAA 1991-2020 U.S. Climate Normals. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 1991–2020 normals.