Red Oak, IA Climate: Temperature & Rain by Month
Temperature and precipitation from NOAA NCEI 1991–2020 normals →, plus PlainClimate's derived comfort score
30-year climate normals (1991-2020) from Red Oak's primary NOAA station, RED OAK.
The climate verdict for Red Oak
Red Oak, Iowa has a mixed annual climate rather than one dominant extreme. Its NOAA normal shows an annual average of 51°F. Its climate comfort score of 59/100 (moderate) lands mid-pack nationally, exceeding 37% of station-mapped location scores.
- 51°F
- average temperature, NOAA 1991-2020 normal
- 59/100
- comfort score, above 37% of station-mapped location scores
- 37.2"
- annual precipitation · 27" snow
- 172 days
- frost-free days per growing season
Red Oak: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00136940 · Red Oak, IA 51°F mean · 37.2" precip
TEMP-COOL · RANK-MID · PHOTO-FINISH · PRCP-MID · SWING-WIDE · COMF-MID · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 51°F
- RANK-MID #3,019
- PHOTO-FINISH ≈ Niobrara
- PRCP-MID 37.2"
- SWING-WIDE 53°F
- COMF-MID 59/100
- LOAD-HEAT 6,205 HDD
- STN-1 USC00136940
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Niobrara, 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.
- Red Oak (this station) 51°F
- Cold Gretna, NE 51°F
- Hot Des Moines, IA 51°F
- Near Niobrara, NE 51°F
- Near Glenwood, IA 51°F
Climate Living Index · Red Oak
Red Oak: 54/100 · grade D
Red Oak publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 1 missing weight rescale to 100.
PlainClimate-derived for Red Oak, not an official NOAA rating. Rankings still use Comfort Score 59/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Precipitation balance | 37.2 in · 2.2 from 35 in | 91/100 · A |
| Normal heat + freeze calendar | 145 calendar days | 50/100 · D |
| Annual temperature balance | 50.8°F · 16.7° from 67.5°F | 44/100 · D |
| Frost-free season | 172 days/year | 43/100 · D |
| Snowfall burden | 27.4 inches/year | 41/100 · D |
Red Oak · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Red Oak is a continental Köppen climate: Dfa
Coldest-month mean 22.7°F and warmest-month mean 75.9°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
- 75.9°F
- Coldest month
- 22.7°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 Red Oak sits across the climate record
Three NOAA fields for Red Oak's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 44th percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- 52nd percentile wetness
- Neither arid nor torrential versus 6,352 station totals.
- Seasonal temperature swing
- Wider than 89%
- Warmest-to-coldest month gap for Red Oak is large versus 6,861 complete station-years.
How Red Oak compares across U.S. station-mapped locations
Red Oak'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
Red Oak's measured station temperature trend
MethodologyAcross 66 complete annual observations from 1941 to 2024, RED OAK warmed at a fitted rate of 0.24°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- Red Oak primary station fitted change +0.24 °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 | 33°F (0°C) | 13°F (-11°C) | 23°F (-5°C) | 0.9" | 7.3" | 30.0 | 0.0 |
| February | 38°F (3°C) | 16°F (-9°C) | 27°F (-3°C) | 1.1" | 8.1" | 25.7 | 0.0 |
| March | 51°F (11°C) | 28°F (-2°C) | 39°F (4°C) | 2.0" | 2.6" | 21.1 | 0.0 |
| April | 63°F (17°C) | 38°F (3°C) | 51°F (10°C) | 3.8" | 1.2" | 8.2 | 0.3 |
| May | 73°F (23°C) | 51°F (10°C) | 62°F (17°C) | 6.0" | 0.0" | 0.5 | 1.2 |
| June | 83°F (28°C) | 61°F (16°C) | 72°F (22°C) | 5.4" | 0.0" | 0.0 | 4.9 |
| July | 86°F (30°C) | 66°F (19°C) | 76°F (24°C) | 4.0" | 0.0" | 0.0 | 9.6 |
| August | 85°F (29°C) | 63°F (17°C) | 74°F (23°C) | 3.9" | 0.0" | 0.0 | 6.9 |
| September | 78°F (26°C) | 53°F (12°C) | 66°F (19°C) | 3.6" | 0.0" | 0.3 | 2.9 |
| October | 66°F (19°C) | 41°F (5°C) | 53°F (12°C) | 3.3" | 0.5" | 7.1 | 0.3 |
| November | 50°F (10°C) | 28°F (-2°C) | 39°F (4°C) | 1.9" | 1.2" | 19.9 | 0.0 |
| December | 37°F (3°C) | 18°F (-8°C) | 28°F (-2°C) | 1.4" | 6.5" | 28.7 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 87°F around July 14, short of 90°F on every date, while 145 dates carry a normal low at or below freezing, the coldest 12°F near January 21.
The freezing stretch
The normal low stays at or below 32°F into March 28, then returns to freezing around November 5, covering 145 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 23, when 42% of years recorded at least a hundredth of an inch. The driest is January 8 at 18%. Summed across the calendar, that is about 103 wet dates a year.
The widest day
September 28 carries the biggest normal gap between afternoon and dawn, 26°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Red Oak.
Monthly Precipitation
Average monthly rainfall and snowfall
Snow: 7.3"
5.4 days with precipitation
Snow: 8.1"
6.6 days with precipitation
Snow: 2.6"
8.0 days with precipitation
Snow: 1.2"
10.9 days with precipitation
13.5 days with precipitation
11.0 days with precipitation
9.5 days with precipitation
8.9 days with precipitation
8.0 days with precipitation
Snow: 0.5"
8.0 days with precipitation
Snow: 1.2"
6.3 days with precipitation
Snow: 6.5"
6.3 days with precipitation
Red Oak runs a summer-peaked wet season
36% of Red Oak'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 May at 6.0", on a wide 53.2°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: May, June, July, taking 41% 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.
When it rains in Red Oak, it arrives in quantity
37.2" of precipitation falls across only about 102 wet days here, averaging 0.36 inches each. Fewer days carry more water: the year's total is delivered in comparatively heavy events rather than persistent damp.
- Days with measurable precipitation
- about 102 a year, 28% of all days
- Average depth per wet day
- 0.36 inches
- Most wet days
- May, about 14
- Fewest wet days
- January, about 5
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year, and a per-day average is not a forecast of any individual storm.
Winter brings real snow to Red Oak
Red Oak averages 27.4 inches of snowfall a year, with February the snowiest month on the normals, spread across roughly 15 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: 27.4 inches of depth.
- Days recording measurable snow: about 15 a year.
- At a rough ten-to-one melt ratio, snow accounts for on the order of 7% 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 13
50% probability date
Last Spring Freeze
April 24
50% probability date
Growing Season
172 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
6,205
Higher = more heating needed
Cooling Degree Days
1,057
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside IA closest to Red Oak 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 (51°F here).
- Ashland, NE 51°F · 0.0°F off
- Attica, IN 51°F · 0.0°F off
- Brady, NE 51°F · 0.0°F off
- Bridgehampton, NY 51°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (37.2" here), excluding temperature-peer places.
- Goliad, TX 37.2" · 0.0" off
- Wallace, ID 37.2" · 0.0" off
- Hillsboro, WI 37.3" · 0.0" off
- Topeka -, KS 37.3" · 0.0" off
Snow and freeze rhythm
When cold and snow define Red Oak
heating led · moderate · mid swing
Red Oak's energy balance leans toward cold weather: 6,205 annual heating degree days against 1,057 for cooling. Its 53.2°F seasonal range still makes the monthly rows more useful than the annual average alone.
Red Oak's frost-free season lasts about 172 days, a middle-length window whose endpoints matter more than the annual average. It describes freeze probability, not year-specific planting conditions.
-
1. Red Oak coldest normal
January
Averaging 23°F (-5°C), this month sits below freezing for the month as a whole, not merely overnight.
-
2. Red Oak typical freeze period
January through December
The station reports average freezing days from January through December.
-
3. Red Oak snow peak
February
Red Oak averages 27.4 inches of snow a year, with February the snowiest month on the normals.
Questions about Red Oak's climate
How much snow does Red Oak get? ▼
How cold does Red Oak get in winter? ▼
How much energy does heating and cooling require in Red Oak? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Red Oak's primary station: RED OAK (USC00136940). 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 1966135). Match rule for Red Oak: 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 Red Oak 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.