Keo, Arkansas climate: Normal weather by month, frost dates and records
Keo's normal year runs from 31°F January nights to 90°F July afternoons, with 50.5 inches of precipitation and 3 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 16.2°C, January lows of 0°C, July highs of 32°C, 1,283 mm of precipitation a year.
- NOAA stationKeo
- Station IDUSC00033862
- Location34.60°N 91.99°W
- Elevation231 ft (70 m)
- From the center1 miles
- Population202
On October 22, the normal high in Keo is 72°F and the normal low 49°F, and the chance of measurable rain or snow is 24%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Keo.
- Jan 50° 31°
- Feb 54° 34°
- Mar 63° 42°
- Apr 73° 51°
- May 80° 60°
- Jun 87° 68°
- Jul 90° 71°
- Aug 89° 69°
- Sep 84° 62°
- Oct 74° 51°
- Nov 61° 41°
- Dec 52° 34°
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 Keo each month?
July is the warmest month, with normal highs of 90°F; January the coldest, with normal lows of 31°F. The most precipitation falls in April (5.50 in), the least in August (2.98 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 50°F | 31°F | 40.3°F | 3.84 | 1.0 | 9 | <1 | 16 | 10 h |
| February | 54°F | 34°F | 44.3°F | 4.02 | 1.4 | 9 | <1 | 11 | 11 h |
| March | 63°F | 42°F | 52.5°F | 5.05 | 0.5 | 10 | <1 | 4 | 11 h 50 min |
| April | 73°F | 51°F | 61.6°F | 5.50 | 0.0 | 9 | <1 | <1 | 13 h |
| May | 80°F | 60°F | 70.0°F | 4.80 | 0.0 | 10 | 1 | <1 | 14 h |
| June | 87°F | 68°F | 77.3°F | 3.36 | 0.0 | 7 | 11 | <1 | 14 h 30 min |
| July | 90°F | 71°F | 80.0°F | 3.53 | 0.0 | 7 | 18 | <1 | 14 h 20 min |
| August | 89°F | 69°F | 78.9°F | 2.98 | 0.0 | 6 | 16 | <1 | 13 h 30 min |
| September | 84°F | 62°F | 72.6°F | 3.14 | 0.0 | 6 | 7 | <1 | 12 h 30 min |
| October | 74°F | 51°F | 62.3°F | 4.39 | 0.0 | 7 | <1 | <1 | 11 h 20 min |
| November | 61°F | 41°F | 50.8°F | 4.46 | 0.0 | 8 | <1 | 5 | 10 h 20 min |
| December | 52°F | 34°F | 42.8°F | 5.46 | 0.1 | 9 | <1 | 13 | 9 h 50 min |
| Year (annual) | 71°F | 51°F | 61.1°F | 50.53 | 3.0 | 97 | 53 | 49 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 10°C | 0°C | 4.6°C | 98 mm | 3 cm |
| February | 12°C | 1°C | 6.8°C | 102 mm | 4 cm |
| March | 17°C | 5°C | 11.4°C | 128 mm | 1 cm |
| April | 23°C | 10°C | 16.4°C | 140 mm | 0 cm |
| May | 27°C | 16°C | 21.1°C | 122 mm | 0 cm |
| June | 31°C | 20°C | 25.2°C | 85 mm | 0 cm |
| July | 32°C | 21°C | 26.7°C | 90 mm | 0 cm |
| August | 32°C | 21°C | 26.1°C | 76 mm | 0 cm |
| September | 29°C | 17°C | 22.6°C | 80 mm | 0 cm |
| October | 23°C | 10°C | 16.8°C | 112 mm | 0 cm |
| November | 16°C | 5°C | 10.4°C | 113 mm | 0 cm |
| December | 11°C | 1°C | 6.0°C | 139 mm | 0 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00033862; 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 Keo?
Normal highs sit between 65°F and 85°F in April, May, September and October. Of those, September has the fewest days with rain (6).
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 USC00033862.
When is the last frost in Keo?
In Keo, the last spring frost (32°F) comes after March 21 in half of years and after April 6 in one year in ten; the first autumn frost comes before November 9 in half of years and before October 27 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
- March 211 year in 10 after April 6; 9 in 10 after March 2
- First autumn frost, half of years before
- November 91 year in 10 before October 27; 9 in 10 before November 26
NOAA puts the median frost-free season at 235 days, and the season without a hard freeze (28°F) at 258 days.
A hard freeze (28°F) comes after March 8 in half of springs and before November 22 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Keo in zone 8a in ZIP code 72083. By the map's own method, the average of each year's coldest night over 1991-2020, Keo's NOAA station is in zone 8a: the coldest night of a typical year reaches 14°F (29 complete years).
Frost dates for every NOAA station in Arkansas · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00033862; 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 Keo?
In a normal year in Keo, 53 days a year reach 90°F (1 of them 100°F or more), 49 nights fall to 32°F or colder and 97 days bring measurable precipitation.
- Days at 90°F or more
- 53a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 49a normal year
- Days that stay below freezing
- 4high of 32°F or less
- Days with 0.01 inch of precipitation
- 97a normal year
- Days with 1 inch of snow or more
- 1a normal year
The highest temperature in this station's record (since 1948) is 107°F, on August 14, 1954; the lowest is −5°F, on January 11, 1962.
The wettest calendar year on that record is 2009, with 82.07 in; the snowiest season is 2020–21, with 18.4 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00033862; records: ACIS (NOAA Regional Climate Centers), station USC00033862. Records use complete months only; a month missing more than three days is left out.
How sunny is Keo?
Over a year 78% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Keo, 4.5 kWh per square metre a day. August is the sunniest month (84%) and February the cloudiest (66%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 70% | 2.5 |
| February | 66% | 3.1 |
| March | 71% | 4.2 |
| April | 76% | 5.4 |
| May | 78% | 6.0 |
| June | 84% | 6.7 |
| July | 84% | 6.5 |
| August | 84% | 5.9 |
| September | 83% | 5.0 |
| October | 78% | 3.9 |
| November | 75% | 2.9 |
| December | 70% | 2.3 |
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 Keo need?
A normal year in Keo brings 3,216 heating degree days, 40% fewer than the median U.S. place (5,373), and 1,825 cooling degree days, 2.0 times the median (908). Five months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 5,083 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 766 | 0 |
| February | 581 | 1 |
| March | 399 | 10 |
| April | 155 | 52 |
| May | 31 | 184 |
| June | 0 | 369 |
| July | 0 | 465 |
| August | 0 | 429 |
| September | 14 | 242 |
| October | 149 | 64 |
| November | 433 | 7 |
| December | 687 | 1 |
| Year (annual) | 3,216 | 1,825 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00033862. 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 Keo been warmer than normal lately?
2022 averaged 61.5°F, 0.4°F above the 1991-2020 normal of 61.1°F.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2022 | 61.5°F | +0.4°F | 53.02 | 4.8 |
Over 67 complete years from 1950 to 2022, the station's annual mean temperature rose at a fitted 2.2°F per century (+0.12°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00033862; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Keo's climate compare?
Keo is warmer than 40 of the other 85 places with their own NOAA record in Arkansas, and wetter than 29. Across the 7,247 U.S. stations with normals, its annual mean of 61.1°F is warmer than 77%.
In the Köppen classification computed from these normals, Keo is Cfa: temperate, 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 Keo share this climate record?
7 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.
- Lonoke, AR4,287 people · 14 mi N
- England, AR2,427 people · 4 mi S
- Humnoke, AR211 people · 14 mi E
- Tucker, AR109 people · 12 mi S
- Allport, AR89 people · 13 mi E
- Coy, AR84 people · 8 mi SE
- Hensley, AR27 people · 14 mi SW
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 Keo's climate
What is the coldest month in Keo?
January, with a normal high of 50°F and a normal low of 31°F. The warmest is July (90°F by day, 71°F at night).
Does it snow in Keo?
Yes: 3 inches in a normal year, falling on 2 days with 0.1 inch or more, the most in February (1.4 inches).
What is the rainiest month in Keo?
April, with 5.50 in of precipitation in a normal year; the driest is August with 2.98 in.
What plant hardiness zone is Keo in?
The USDA's 2023 map puts Keo in zone 8a in ZIP code 72083. By the same method at Keo's NOAA station, the coldest night of a typical year reaches 14°F (29 years, 1991-2020): zone 8a.
How late can frost come in Keo?
In half of years the last 32°F night comes after March 21; in one year in ten it comes after April 6. Waiting until April 6 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Arkansas climateThe statewide normals and every place in the state
- Little Rock, AR16 miles from this station, 61.7°F a year
- North Little Rock, AR22 miles from this station, 61.8°F a year
- Cabot, AR26 miles from this station, 60.9°F a year
- Marche, AR28 miles from this station, 60.3°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made