Little Sioux, IA Climate: Temperature & Rain by Month
Annual temperature and rainfall from NOAA NCEI's 1991–2020 normals →; comfort score computed by PlainClimate
30-year climate normals (1991-2020) from Little Sioux's primary NOAA station, LITTLE SIOUX 2 NW.
The climate verdict for Little Sioux
Little Sioux, Iowa has a mixed annual climate rather than one dominant extreme. Its NOAA normal shows an annual average of 48°F. Its climate comfort score of 59/100 (moderate) lands mid-pack nationally, exceeding 37% of station-mapped location scores.
- 48°F
- yearly average temperature, NOAA normal
- 59/100
- comfort score, above 37% of station-mapped location scores
- 39.8"
- annual precipitation · 46" snow
- 155 days
- frost-free days per growing season
Little Sioux: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00134874 · Little Sioux, IA 48°F mean · 39.8" precip
TEMP-COOL · RANK-COOL · PHOTO-FINISH · PRCP-MID · SWING-WIDE · COMF-MID · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 48°F
- RANK-COOL #2,196
- PHOTO-FINISH ≈ Crofton
- PRCP-MID 39.8"
- SWING-WIDE 55°F
- COMF-MID 59/100
- LOAD-HEAT 6,983 HDD
- STN-1 USC00134874
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Crofton, NE (+ 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 IA station list.
- Little Sioux (this station) 48°F
- Cold Sioux City Ang, IA 48°F
- Hot Chamberlain, SD 48°F
- Near Crofton, NE 48°F
- Near Osmond, NE 48°F
Climate Living Index · Little Sioux
Little Sioux: 41/100 · grade D
Little Sioux publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 1 missing weight rescale to 100.
PlainClimate-derived for Little Sioux, not an official NOAA rating. Rankings still use Comfort Score 59/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Precipitation balance | 39.8 in · 4.8 from 35 in | 83/100 · B |
| Normal heat + freeze calendar | 163 calendar days | 37/100 · F |
| Annual temperature balance | 48.1°F · 19.4° from 67.5°F | 32/100 · F |
| Frost-free season | 155 days/year | 29/100 · F |
| Snowfall burden | 45.6 inches/year | 23/100 · F |
Little Sioux · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Little Sioux is a continental Köppen climate: Dfa
Coldest-month mean 19.1°F and warmest-month mean 73.9°F place this station in continental, no dry season, hot summer climates (Dfa). Class Dfa is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: continental, specifically continental, no dry season, hot summer.
- Köppen code
- Dfa
- Group
- Continental
- Warmest month
- 73.9°F
- Coldest month
- 19.1°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 Little Sioux sits across the climate record
Three NOAA fields for Little Sioux's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 32nd percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- 57th percentile wetness
- Neither arid nor torrential versus 6,352 station totals.
- Seasonal temperature swing
- Wider than 92%
- Warmest-to-coldest month gap for Little Sioux is large versus 6,861 complete station-years.
How Little Sioux compares across U.S. station-mapped locations
Little Sioux's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
59 37th percentile score exceeds 37% 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%). Below this entry.
- 50–60: 1,329 station-mapped locations (21%). This entry sits in this band.
- 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
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 29°F (-1°C) | 9°F (-13°C) | 19°F (-7°C) | 0.9" | 10.0" | 30.6 | 0.0 |
| February | 34°F (1°C) | 13°F (-11°C) | 23°F (-5°C) | 1.3" | 13.4" | 27.6 | 0.0 |
| March | 48°F (9°C) | 24°F (-4°C) | 36°F (2°C) | 2.3" | 6.9" | 24.3 | 0.0 |
| April | 62°F (17°C) | 35°F (1°C) | 48°F (9°C) | 3.9" | 1.9" | 13.2 | 0.4 |
| May | 73°F (23°C) | 48°F (9°C) | 60°F (16°C) | 5.1" | 0.3" | 1.9 | 1.8 |
| June | 83°F (28°C) | 59°F (15°C) | 71°F (21°C) | 5.7" | 0.0" | 0.0 | 6.1 |
| July | 86°F (30°C) | 62°F (17°C) | 74°F (23°C) | 4.8" | 0.0" | 0.0 | 9.8 |
| August | 83°F (29°C) | 60°F (16°C) | 72°F (22°C) | 4.5" | 0.0" | 0.0 | 5.0 |
| September | 77°F (25°C) | 50°F (10°C) | 64°F (18°C) | 5.0" | 0.0" | 1.2 | 2.8 |
| October | 64°F (18°C) | 37°F (3°C) | 51°F (10°C) | 2.9" | 1.0" | 11.9 | 0.3 |
| November | 48°F (9°C) | 24°F (-5°C) | 36°F (2°C) | 1.7" | 2.3" | 24.4 | 0.0 |
| December | 34°F (1°C) | 14°F (-10°C) | 24°F (-5°C) | 1.5" | 9.8" | 30.5 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 86°F around July 13, short of 90°F on every date, while 163 dates carry a normal low at or below freezing, the coldest 8°F near January 18.
The freezing stretch
The normal low stays at or below 32°F into April 7, then returns to freezing around October 28, covering 163 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 25, when 44% of years recorded at least a hundredth of an inch. The driest is November 21 at 20%. Summed across the calendar, that is about 114 wet dates a year.
The widest day
September 24 carries the biggest normal gap between afternoon and dawn, 28°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Little Sioux.
Monthly Precipitation
Average monthly rainfall and snowfall
Snow: 10.0"
8.1 days with precipitation
Snow: 13.4"
8.3 days with precipitation
Snow: 6.9"
9.2 days with precipitation
Snow: 1.9"
10.3 days with precipitation
Snow: 0.3"
13.9 days with precipitation
12.6 days with precipitation
10.4 days with precipitation
9.6 days with precipitation
9.7 days with precipitation
Snow: 1.0"
9.3 days with precipitation
Snow: 2.3"
5.7 days with precipitation
Snow: 9.8"
7.1 days with precipitation
Little Sioux runs a summer-peaked wet season
38% of Little Sioux'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 5.7", on a wide 54.8°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, September, taking 40% of the annual total between them.
- Driest month: January at 0.9".
- Winter share: 9% 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 Little Sioux's precipitation splits across the calendar
About 114 days a year record measurable precipitation here, carrying 39.8" 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 Little Sioux
Little Sioux averages 45.6 inches of snowfall a year, with February the snowiest month on the normals, spread across roughly 29 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: 45.6 inches of depth.
- Days recording measurable snow: about 29 a year.
- At a rough ten-to-one melt ratio, snow accounts for on the order of 11% 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 3
50% probability date
Last Spring Freeze
May 1
50% probability date
Growing Season
155 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
6,983
Higher = more heating needed
Cooling Degree Days
864
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside IA closest to Little Sioux 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 (48°F here).
- Castleford, ID 48°F · 0.0°F off
- Concord, NE 48°F · 0.0°F off
- Crofton, NE 48°F · 0.0°F off
- Dowagiac, MI 48°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (39.8" here), excluding temperature-peer places.
- Celina, OH 39.8" · 0.0" off
- Princeton, IL 39.8" · 0.0" off
- Lancaster, NH 39.8" · 0.0" off
- Marathon, FL 39.7" · 0.0" off
Snow and freeze rhythm
When cold and snow define Little Sioux
heating led · moderate · mid swing
Little Sioux's energy balance leans toward cold weather: 6,983 annual heating degree days against 864 for cooling. Its 54.8°F seasonal range still makes the monthly rows more useful than the annual average alone.
Little Sioux's frost-free season lasts about 155 days, a middle-length window whose endpoints matter more than the annual average. It describes freeze probability, not year-specific planting conditions.
-
1. Little Sioux coldest normal
January
Averaging 19°F (-7°C), this month sits below freezing for the month as a whole, not merely overnight.
-
2. Little Sioux typical freeze period
January through December
The station reports average freezing days from January through December.
-
3. Little Sioux snow peak
February
Little Sioux averages 45.6 inches of snow a year, with February the snowiest month on the normals.
Questions about Little Sioux's climate
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How cold does Little Sioux get in winter? ▼
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Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Little Sioux's primary station: LITTLE SIOUX 2 NW (USC00134874). 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 1945840). Match rule for Little Sioux: 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 Little Sioux 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.