St. Charles, Arkansas climate: Normal weather by month, frost dates and records
St. Charles's normal year runs from 33°F January nights to 90°F July afternoons, with 51.9 inches of precipitation and 1 inch of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 16.7°C, January lows of 0°C, July highs of 32°C, 1,318 mm of precipitation a year.
- NOAA stationSaint Charles
- Station IDUSC00036376
- Location34.37°N 91.12°W
- Elevation200 ft (61 m)
- Population191
On October 14, the normal high in St. Charles is 76°F and the normal low 52°F, and the chance of measurable rain or snow is 16%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for St. Charles.
- Jan 50° 33°
- Feb 55° 36°
- Mar 64° 44°
- Apr 72° 52°
- May 80° 61°
- Jun 87° 69°
- Jul 90° 72°
- Aug 90° 70°
- Sep 85° 63°
- Oct 75° 51°
- Nov 62° 42°
- Dec 53° 35°
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 St. Charles each month?
July is the warmest month, with normal highs of 90°F; January the coldest, with normal lows of 33°F. The most precipitation falls in April (5.86 in), the least in August (2.76 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 50°F | 33°F | 41.3°F | 4.36 | 0.6 | 7 | <1 | 17 | 10 h 10 min |
| February | 55°F | 36°F | 45.1°F | 4.70 | 0.2 | 7 | <1 | 11 | 11 h |
| March | 64°F | 44°F | 53.5°F | 5.73 | 0.4 | 7 | <1 | 5 | 11 h 50 min |
| April | 72°F | 52°F | 62.0°F | 5.86 | 0.0 | 7 | <1 | <1 | 13 h |
| May | 80°F | 61°F | 70.3°F | 4.49 | 0.0 | 7 | 2 | <1 | 14 h |
| June | 87°F | 69°F | 77.8°F | 3.54 | 0.0 | 5 | 14 | <1 | 14 h 30 min |
| July | 90°F | 72°F | 80.8°F | 3.80 | 0.0 | 6 | 21 | <1 | 14 h 20 min |
| August | 90°F | 70°F | 79.9°F | 2.76 | 0.0 | 5 | 19 | <1 | 13 h 30 min |
| September | 85°F | 63°F | 74.0°F | 3.02 | 0.0 | 4 | 11 | <1 | 12 h 30 min |
| October | 75°F | 51°F | 62.8°F | 3.79 | 0.0 | 5 | 1 | 1 | 11 h 20 min |
| November | 62°F | 42°F | 51.9°F | 4.55 | 0.0 | 6 | <1 | 6 | 10 h 20 min |
| December | 53°F | 35°F | 44.0°F | 5.28 | 0.0 | 6 | <1 | 14 | 9 h 50 min |
| Year (annual) | 72°F | 52°F | 62.0°F | 51.88 | 1.2 | 72 | 68 | 54 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 10°C | 0°C | 5.2°C | 111 mm | 2 cm |
| February | 13°C | 2°C | 7.3°C | 119 mm | 1 cm |
| March | 18°C | 6°C | 11.9°C | 146 mm | 1 cm |
| April | 22°C | 11°C | 16.7°C | 149 mm | 0 cm |
| May | 27°C | 16°C | 21.3°C | 114 mm | 0 cm |
| June | 31°C | 20°C | 25.4°C | 90 mm | 0 cm |
| July | 32°C | 22°C | 27.1°C | 97 mm | 0 cm |
| August | 32°C | 21°C | 26.6°C | 70 mm | 0 cm |
| September | 29°C | 17°C | 23.3°C | 77 mm | 0 cm |
| October | 24°C | 11°C | 17.1°C | 96 mm | 0 cm |
| November | 17°C | 5°C | 11.1°C | 116 mm | 0 cm |
| December | 12°C | 2°C | 6.7°C | 134 mm | 0 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00036376; 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 St. Charles?
Normal highs sit between 65°F and 85°F in April, May, September and October. Of those, September has the fewest days with rain (4).
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 USC00036376.
When is the last frost in St. Charles?
In St. Charles, the last spring frost (32°F) comes after March 17 in half of years and after April 5 in one year in ten; the first autumn frost comes before November 10 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 171 year in 10 after April 5; 9 in 10 after February 28
- First autumn frost, half of years before
- November 101 year in 10 before October 27; 9 in 10 before December 1
NOAA puts the median frost-free season at 238 days, and the season without a hard freeze (28°F) at 264 days.
A hard freeze (28°F) comes after March 5 in half of springs and before November 23 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts St. Charles in zone 8b in ZIP code 72140, the nearest ZIP area.
Frost dates for every NOAA station in Arkansas · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00036376; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. 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 St. Charles?
In a normal year in St. Charles, 68 days a year reach 90°F (2 of them 100°F or more), 54 nights fall to 32°F or colder and 72 days bring measurable precipitation.
- Days at 90°F or more
- 68a normal year
- Days at 100°F or more
- 2a normal year
- Nights at 32°F or colder
- 54a normal year
- Days that stay below freezing
- 4high of 32°F or less
- Days with 0.01 inch of precipitation
- 72a normal year
- Days with 1 inch of snow or more
- fewer than 1a normal year
The highest temperature in this station's record (since 1930) is 111°F, on July 29, 1930; the lowest is −5°F, on January 12, 1962.
The wettest calendar year on that record is 1957, with 71.96 in; the snowiest season is 1987–88, with 15.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00036376; records: ACIS (NOAA Regional Climate Centers), station USC00036376. Records use complete months only; a month missing more than three days is left out.
How sunny is St. Charles?
Over a year 78% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around St. Charles, 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 St. Charles need?
A normal year in St. Charles brings 3,050 heating degree days, 43% fewer than the median U.S. place (5,373), and 1,974 cooling degree days, 2.2 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 5,307 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 737 | 0 |
| February | 558 | 2 |
| March | 369 | 14 |
| April | 148 | 58 |
| May | 31 | 197 |
| June | 0 | 386 |
| July | 0 | 491 |
| August | 0 | 462 |
| September | 12 | 280 |
| October | 144 | 74 |
| November | 400 | 8 |
| December | 652 | 1 |
| Year (annual) | 3,050 | 1,974 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00036376. 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 St. Charles been warmer than normal lately?
2024 averaged 64.3°F, 2.3°F above the 1991-2020 normal of 62.0°F. 2 of the 2 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 63.0°F | +1.0°F | 56.29 | 9.8 |
| 2024 | 64.3°F | +2.3°F | 61.81 | 0.0 |
Over 38 complete years from 1938 to 2024, the station's annual mean temperature rose at a fitted 2.0°F per century (+0.11°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00036376; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does St. Charles's climate compare?
St. Charles is warmer than 57 of the other 85 places with their own NOAA record in Arkansas, and wetter than 48. Across the 7,247 U.S. stations with normals, its annual mean of 62.0°F is warmer than 80%.
In the Köppen classification computed from these normals, St. Charles 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 St. Charles share this climate record?
2 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.
- DeWitt, AR2,844 people · 13 mi SW
- Indian Bay, AR0 people · 3 mi E
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 St. Charles's climate
What is the coldest month in St. Charles?
January, with a normal high of 50°F and a normal low of 33°F. The warmest is July (90°F by day, 72°F at night).
Does it snow in St. Charles?
Yes: 1 inch in a normal year, falling on 1 days with 0.1 inch or more, the most in January (0.6 inches).
What is the rainiest month in St. Charles?
April, with 5.86 in of precipitation in a normal year; the driest is August with 2.76 in.
What plant hardiness zone is St. Charles in?
The USDA's 2023 map puts St. Charles in zone 8b in ZIP code 72140, the nearest ZIP area.
How late can frost come in St. Charles?
In half of years the last 32°F night comes after March 17; in one year in ten it comes after April 5. Waiting until April 5 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Arkansas climateThe statewide normals and every place in the state
- Stuttgart, AR18 miles from this station, 63.1°F a year
- Clarendon, AR25 miles from this station, 61.5°F a year
- Arkansas Post, AR27 miles from this station, 63.5°F a year
- Helena, AR32 miles from this station, 62.2°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made