Clarksville, Missouri climate: Normal weather by month, frost dates and records
Clarksville's normal year runs from 20°F January nights to 87°F July afternoons, with 38.5 inches of precipitation and 12 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 12.4°C, January lows of −7°C, July highs of 31°C, 977 mm of precipitation a year.
- NOAA stationClarksville Lock and Dam 24
- Station IDUSC00231640
- Location39.37°N 90.91°W
- Elevation460 ft (140 m)
- Population376
On October 14, the normal high in Clarksville is 68°F and the normal low 47°F, and the chance of measurable rain or snow is 29%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Clarksville.
- Jan 37° 20°
- Feb 41° 24°
- Mar 52° 33°
- Apr 65° 44°
- May 74° 54°
- Jun 84° 64°
- Jul 87° 68°
- Aug 86° 67°
- Sep 79° 58°
- Oct 67° 46°
- Nov 53° 35°
- Dec 41° 25°
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 Clarksville each month?
July is the warmest month, with normal highs of 87°F; January the coldest, with normal lows of 20°F. The most precipitation falls in May (4.60 in), the least in February (1.73 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 37°F | 20°F | 28.1°F | 2.05 | 4.5 | 8 | <1 | 27 | 9 h 40 min |
| February | 41°F | 24°F | 32.4°F | 1.73 | 3.2 | 8 | <1 | 23 | 10 h 40 min |
| March | 52°F | 33°F | 42.7°F | 3.01 | 1.4 | 10 | <1 | 16 | 11 h 50 min |
| April | 65°F | 44°F | 54.4°F | 4.02 | 0.1 | 11 | <1 | 3 | 13 h 10 min |
| May | 74°F | 54°F | 64.4°F | 4.60 | 0.0 | 12 | 1 | <1 | 14 h 20 min |
| June | 84°F | 64°F | 73.9°F | 4.44 | 0.0 | 11 | 7 | <1 | 15 h |
| July | 87°F | 68°F | 77.9°F | 3.91 | 0.0 | 9 | 13 | <1 | 14 h 40 min |
| August | 86°F | 67°F | 76.2°F | 3.53 | 0.0 | 8 | 9 | <1 | 13 h 50 min |
| September | 79°F | 58°F | 68.8°F | 3.21 | 0.0 | 7 | 4 | <1 | 12 h 30 min |
| October | 67°F | 46°F | 56.7°F | 2.91 | 0.0 | 9 | <1 | 1 | 11 h 10 min |
| November | 53°F | 35°F | 43.8°F | 3.00 | 0.1 | 9 | <1 | 13 | 10 h |
| December | 41°F | 25°F | 33.1°F | 2.06 | 2.3 | 9 | <1 | 25 | 9 h 30 min |
| Year (annual) | 64°F | 45°F | 54.4°F | 38.47 | 11.6 | 111 | 34 | 108 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 3°C | −7°C | −2.2°C | 52 mm | 11 cm |
| February | 5°C | −5°C | 0.2°C | 44 mm | 8 cm |
| March | 11°C | 1°C | 5.9°C | 76 mm | 4 cm |
| April | 18°C | 7°C | 12.4°C | 102 mm | 0 cm |
| May | 24°C | 12°C | 18.0°C | 117 mm | 0 cm |
| June | 29°C | 18°C | 23.3°C | 113 mm | 0 cm |
| July | 31°C | 20°C | 25.5°C | 99 mm | 0 cm |
| August | 30°C | 19°C | 24.6°C | 90 mm | 0 cm |
| September | 26°C | 15°C | 20.4°C | 82 mm | 0 cm |
| October | 19°C | 8°C | 13.7°C | 74 mm | 0 cm |
| November | 12°C | 1°C | 6.6°C | 76 mm | 0 cm |
| December | 5°C | −4°C | 0.6°C | 52 mm | 6 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00231640; 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 Clarksville?
Normal highs sit between 65°F and 85°F in April, May, June, September and October. 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 USC00231640.
When is the last frost in Clarksville?
In Clarksville, the last spring frost (32°F) comes after April 4 in half of years and after April 23 in one year in ten; the first autumn frost comes before November 1 in half of years and before October 19 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 41 year in 10 after April 23; 9 in 10 after March 20
- First autumn frost, half of years before
- November 11 year in 10 before October 19; 9 in 10 before November 15
NOAA puts the median frost-free season at 208 days, and the season without a hard freeze (28°F) at 229 days.
A hard freeze (28°F) comes after March 24 in half of springs and before November 11 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Clarksville in zone 6b in ZIP code 63336, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Clarksville's NOAA station is in zone 6b: the coldest night of a typical year reaches −4°F (25 complete years).
Frost dates for every NOAA station in Missouri · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00231640; 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 Clarksville?
In a normal year in Clarksville, 34 days a year reach 90°F (2 of them 100°F or more), 108 nights fall to 32°F or colder and 111 days bring measurable precipitation.
- Days at 90°F or more
- 34a normal year
- Days at 100°F or more
- 2a normal year
- Nights at 32°F or colder
- 108a normal year
- Days that stay below freezing
- 27high of 32°F or less
- Days with 0.01 inch of precipitation
- 111a normal year
- Days with 1 inch of snow or more
- 5a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00231640.
How sunny is Clarksville?
Over a year 75% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Clarksville, 4.1 kWh per square metre a day. July is the sunniest month (83%) and December the cloudiest (65%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 66% | 2.0 |
| February | 67% | 2.8 |
| March | 68% | 3.7 |
| April | 72% | 4.9 |
| May | 73% | 5.6 |
| June | 80% | 6.3 |
| July | 83% | 6.4 |
| August | 81% | 5.6 |
| September | 82% | 4.8 |
| October | 75% | 3.3 |
| November | 72% | 2.3 |
| December | 65% | 1.7 |
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 Clarksville need?
A normal year in Clarksville brings 5,166 heating degree days, 4% fewer than the median U.S. place (5,373), and 1,324 cooling degree days, 46% more than the median (908). Six months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 3,955 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,144 | 0 |
| February | 911 | 0 |
| March | 695 | 2 |
| April | 335 | 17 |
| May | 113 | 95 |
| June | 10 | 275 |
| July | 1 | 399 |
| August | 2 | 350 |
| September | 47 | 159 |
| October | 284 | 27 |
| November | 637 | 1 |
| December | 989 | 0 |
| Year (annual) | 5,166 | 1,324 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00231640. 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 Clarksville been warmer than normal lately?
2023 averaged 56.5°F, 2.1°F above the 1991-2020 normal of 54.4°F.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2023 | 56.5°F | +2.1°F | 33.40 | – |
Source: observed years: ACIS, station USC00231640. A year counts only with all twelve months complete.
How does Clarksville's climate compare?
Clarksville is warmer than 48 of the other 133 places with their own NOAA record in Missouri, and wetter than 8. Across the 7,247 U.S. stations with normals, its annual mean of 54.4°F is warmer than 58%.
In the Köppen classification computed from these normals, Clarksville 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 Clarksville 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.
- Pleasant Hill, IL905 people · 5 mi N
- Eolia, MO489 people · 11 mi SW
- Nebo, IL272 people · 8 mi NE
- Pearl, IL105 people · 16 mi E
- Paynesville, MO61 people · 8 mi S
- Rockport, IL48 people · 13 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 Clarksville's climate
What is the coldest month in Clarksville?
January, with a normal high of 37°F and a normal low of 20°F. The warmest is July (87°F by day, 68°F at night).
Does it snow in Clarksville?
Yes: 12 inches in a normal year, falling on 8 days with 0.1 inch or more, the most in January (4.5 inches).
What is the rainiest month in Clarksville?
May, with 4.60 in of precipitation in a normal year; the driest is February with 1.73 in.
What plant hardiness zone is Clarksville in?
The USDA's 2023 map puts Clarksville in zone 6b in ZIP code 63336, the nearest ZIP area. By the same method at Clarksville's NOAA station, the coldest night of a typical year reaches −4°F (25 years, 1991-2020): zone 6b.
How late can frost come in Clarksville?
In half of years the last 32°F night comes after April 4; in one year in ten it comes after April 23. Waiting until April 23 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Missouri climateThe statewide normals and every place in the state
- Bowling Green, MO14 miles from this station, 53.3°F a year
- Elsberry, MO16 miles from this station, 54.0°F a year
- Pittsfield, IL18 miles from this station, 53.8°F a year
- Saverton, MO26 miles from this station, 55.0°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made