Keosauqua, Iowa climate: Normal weather by month, frost dates and records
Keosauqua's normal year runs from 14°F January nights to 86°F July afternoons, with 39.7 inches of precipitation and 23 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 10.3°C, January lows of −10°C, July highs of 30°C, 1,009 mm of precipitation a year.
- NOAA stationKeosauqua
- Station IDUSC00134389
- Location40.74°N 91.97°W
- Elevation629 ft (192 m)
- From the centerunder 1 mile
- Population944
On October 23, the normal high in Keosauqua is 61°F and the normal low 39°F, and the chance of measurable rain or snow is 23%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Keosauqua.
- Jan 32° 14°
- Feb 37° 17°
- Mar 50° 29°
- Apr 63° 39°
- May 73° 51°
- Jun 82° 60°
- Jul 86° 65°
- Aug 85° 62°
- Sep 78° 53°
- Oct 65° 42°
- Nov 49° 29°
- Dec 37° 20°
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 Keosauqua each month?
July is the warmest month, with normal highs of 86°F; January the coldest, with normal lows of 14°F. The most precipitation falls in May (5.67 in), the least in January (1.50 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 32°F | 14°F | 22.9°F | 1.50 | 7.3 | 6 | <1 | 29 | 9 h 30 min |
| February | 37°F | 17°F | 26.9°F | 2.11 | 5.3 | 7 | <1 | 24 | 10 h 40 min |
| March | 50°F | 29°F | 39.3°F | 2.45 | 2.7 | 7 | <1 | 19 | 11 h 50 min |
| April | 63°F | 39°F | 51.1°F | 3.64 | 0.9 | 10 | <1 | 7 | 13 h 20 min |
| May | 73°F | 51°F | 61.7°F | 5.67 | 0.0 | 11 | 1 | <1 | 14 h 30 min |
| June | 82°F | 60°F | 71.1°F | 5.29 | 0.0 | 10 | 6 | <1 | 15 h |
| July | 86°F | 65°F | 75.2°F | 4.48 | 0.0 | 8 | 11 | <1 | 14 h 50 min |
| August | 85°F | 62°F | 73.4°F | 3.60 | 0.0 | 8 | 10 | <1 | 13 h 50 min |
| September | 78°F | 53°F | 65.3°F | 3.69 | 0.0 | 7 | 4 | <1 | 12 h 30 min |
| October | 65°F | 42°F | 53.1°F | 2.97 | 0.2 | 7 | <1 | 5 | 11 h 10 min |
| November | 49°F | 29°F | 39.3°F | 2.35 | 1.1 | 7 | <1 | 18 | 10 h |
| December | 37°F | 20°F | 28.3°F | 1.96 | 5.5 | 6 | <1 | 26 | 9 h 20 min |
| Year (annual) | 61°F | 40°F | 50.6°F | 39.71 | 23.0 | 92 | 32 | 128 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 0°C | −10°C | −5.1°C | 38 mm | 19 cm |
| February | 3°C | −8°C | −2.8°C | 54 mm | 13 cm |
| March | 10°C | −2°C | 4.1°C | 62 mm | 7 cm |
| April | 17°C | 4°C | 10.6°C | 92 mm | 2 cm |
| May | 23°C | 10°C | 16.5°C | 144 mm | 0 cm |
| June | 28°C | 16°C | 21.7°C | 134 mm | 0 cm |
| July | 30°C | 18°C | 24.0°C | 114 mm | 0 cm |
| August | 29°C | 17°C | 23.0°C | 91 mm | 0 cm |
| September | 25°C | 12°C | 18.5°C | 94 mm | 0 cm |
| October | 18°C | 5°C | 11.7°C | 75 mm | 1 cm |
| November | 10°C | −2°C | 4.1°C | 60 mm | 3 cm |
| December | 3°C | −7°C | −2.1°C | 50 mm | 14 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00134389; 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 Keosauqua?
Normal highs sit between 65°F and 85°F in May, June, August and September. Of those, September has the fewest days with rain (7).
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 USC00134389.
When is the last frost in Keosauqua?
In Keosauqua, the last spring frost (32°F) comes after April 26 in half of years and after May 11 in one year in ten; the first autumn frost comes before October 13 in half of years and before September 28 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
- April 261 year in 10 after May 11; 9 in 10 after April 10
- First autumn frost, half of years before
- October 131 year in 10 before September 28; 9 in 10 before October 26
NOAA puts the median frost-free season at 169 days, and the season without a hard freeze (28°F) at 190 days.
A hard freeze (28°F) comes after April 14 in half of springs and before October 23 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Keosauqua in zone 5b in ZIP code 52565, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Keosauqua's NOAA station is in zone 5b: the coldest night of a typical year reaches −12°F (24 complete years).
Frost dates for every NOAA station in Iowa · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00134389; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. 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 Keosauqua?
In a normal year in Keosauqua, 32 days a year reach 90°F (2 of them 100°F or more), 128 nights fall to 32°F or colder and 92 days bring measurable precipitation.
- Days at 90°F or more
- 32a normal year
- Days at 100°F or more
- 2a normal year
- Nights at 32°F or colder
- 128a normal year
- Days that stay below freezing
- 36high of 32°F or less
- Days with 0.01 inch of precipitation
- 92a normal year
- Days with 1 inch of snow or more
- 9a normal year
The highest temperature in this station's record (since 1893) is 115°F, on July 15, 1936; the lowest is −36°F, on January 22, 1930.
The wettest calendar year on that record is 1973, with 62.94 in; the snowiest season is 2013–14, with 53.9 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00134389; records: ACIS (NOAA Regional Climate Centers), station USC00134389. Records use complete months only; a month missing more than three days is left out.
How sunny is Keosauqua?
Over a year 74% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Keosauqua, 4.1 kWh per square metre a day. September is the sunniest month (82%) and January the cloudiest (64%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 64% | 1.9 |
| February | 68% | 2.8 |
| March | 67% | 3.7 |
| April | 70% | 4.9 |
| May | 72% | 5.6 |
| June | 78% | 6.3 |
| July | 82% | 6.4 |
| August | 81% | 5.6 |
| September | 82% | 4.7 |
| October | 73% | 3.2 |
| November | 71% | 2.2 |
| December | 64% | 1.6 |
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 Keosauqua need?
A normal year in Keosauqua brings 6,180 heating degree days, 15% more than the median U.S. place (5,373), and 980 cooling degree days, 8% 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 3,356 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,305 | 0 |
| February | 1,067 | 0 |
| March | 798 | 1 |
| April | 426 | 9 |
| May | 168 | 64 |
| June | 19 | 200 |
| July | 2 | 318 |
| August | 7 | 266 |
| September | 96 | 106 |
| October | 383 | 16 |
| November | 771 | 1 |
| December | 1,139 | 0 |
| Year (annual) | 6,180 | 980 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00134389. 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.
Has Keosauqua been warmer than normal lately?
2025 averaged 51.9°F, 1.3°F above the 1991-2020 normal of 50.6°F. 2 of the 3 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 51.9°F | +1.3°F | – | – |
| 2022 | 49.9°F | −0.7°F | – | – |
| 2025 | 51.9°F | +1.3°F | – | – |
Over 104 complete years from 1893 to 2025, the station's annual mean temperature rose at a fitted 1.4°F per century (+0.07°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00134389; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Keosauqua's climate compare?
Keosauqua is warmer than 117 of the other 131 places with their own NOAA record in Iowa, and wetter than 123. Across the 7,247 U.S. stations with normals, its annual mean of 50.6°F is warmer than 43%.
In the Köppen classification computed from these normals, Keosauqua is Dfa: continental, no dry season, hot summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Keosauqua 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.
- Bonaparte, IA357 people · 9 mi E
- Stockport, IA272 people · 11 mi NE
- Douds, IA100 people · 9 mi NW
- Luray, MO71 people · 20 mi S
- Granger, MO23 people · 19 mi S
- Leando, IA23 people · 8 mi NW
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 Keosauqua's climate
What is the coldest month in Keosauqua?
January, with a normal high of 32°F and a normal low of 14°F. The warmest is July (86°F by day, 65°F at night).
Does it snow in Keosauqua?
Yes: 23 inches in a normal year, falling on 12 days with 0.1 inch or more, the most in January (7.3 inches).
What is the rainiest month in Keosauqua?
May, with 5.67 in of precipitation in a normal year; the driest is January with 1.50 in.
What plant hardiness zone is Keosauqua in?
The USDA's 2023 map puts Keosauqua in zone 5b in ZIP code 52565, the nearest ZIP area. By the same method at Keosauqua's NOAA station, the coldest night of a typical year reaches −12°F (24 years, 1991-2020): zone 5b.
How late can frost come in Keosauqua?
In half of years the last 32°F night comes after April 26; in one year in ten it comes after May 11. Waiting until May 11 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Iowa climateThe statewide normals and every place in the state
- Fairfield, IA20 miles from this station, 49.7°F a year
- Donnellson, IA22 miles from this station, 51.7°F a year
- Memphis, MO22 miles from this station, 50.6°F a year
- Bloomfield, IA23 miles from this station, 51.2°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made