Clearwater Dam, Missouri climate: Climate normals at a NOAA weather station
Clearwater Dam's normal year runs from 23°F January nights to 89°F July afternoons, with 48.7 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 13.6°C, January lows of −5°C, July highs of 32°C, 1,238 mm of precipitation a year.
- NOAA stationClearwater Dam
- Station IDUSC00231674
- Location37.13°N 90.78°W
- Elevation660 ft (201 m)
On October 23, the normal high in Clearwater Dam is 68°F and the normal low 42°F, and the chance of measurable rain or snow is 25%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Clearwater Dam.
- Jan 43° 23°
- Feb 48° 27°
- Mar 58° 35°
- Apr 69° 44°
- May 77° 54°
- Jun 85° 63°
- Jul 89° 68°
- Aug 88° 66°
- Sep 80° 57°
- Oct 70° 45°
- Nov 57° 35°
- Dec 46° 27°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like at Clearwater Dam each month?
July is the warmest month, with normal highs of 89°F; January the coldest, with normal lows of 23°F. The most precipitation falls in April (5.30 in), the least in February (3.24 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 43°F | 23°F | 33.2°F | 3.40 | 8 | <1 | 26 | 9 h 50 min |
| February | 48°F | 27°F | 37.7°F | 3.24 | 7 | <1 | 22 | 10 h 50 min |
| March | 58°F | 35°F | 46.6°F | 4.69 | 10 | <1 | 15 | 11 h 50 min |
| April | 69°F | 44°F | 56.8°F | 5.30 | 9 | <1 | 4 | 13 h 10 min |
| May | 77°F | 54°F | 65.7°F | 5.05 | 10 | 2 | <1 | 14 h 10 min |
| June | 85°F | 63°F | 74.3°F | 3.91 | 9 | 10 | <1 | 14 h 40 min |
| July | 89°F | 68°F | 78.6°F | 4.64 | 9 | 19 | <1 | 14 h 30 min |
| August | 88°F | 66°F | 76.8°F | 3.25 | 8 | 15 | <1 | 13 h 40 min |
| September | 80°F | 57°F | 68.7°F | 3.84 | 7 | 4 | <1 | 12 h 30 min |
| October | 70°F | 45°F | 57.4°F | 3.44 | 7 | <1 | 3 | 11 h 20 min |
| November | 57°F | 35°F | 46.0°F | 4.61 | 8 | <1 | 15 | 10 h 10 min |
| December | 46°F | 27°F | 36.5°F | 3.36 | 7 | <1 | 24 | 9 h 40 min |
| Year (annual) | 68°F | 45°F | 56.5°F | 48.73 | 98 | 50 | 109 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 6°C | −5°C | 0.7°C | 86 mm |
| February | 9°C | −3°C | 3.2°C | 82 mm |
| March | 15°C | 2°C | 8.1°C | 119 mm |
| April | 21°C | 7°C | 13.8°C | 135 mm |
| May | 25°C | 12°C | 18.7°C | 128 mm |
| June | 30°C | 17°C | 23.5°C | 99 mm |
| July | 32°C | 20°C | 25.9°C | 118 mm |
| August | 31°C | 19°C | 24.9°C | 83 mm |
| September | 27°C | 14°C | 20.4°C | 98 mm |
| October | 21°C | 7°C | 14.1°C | 87 mm |
| November | 14°C | 2°C | 7.8°C | 117 mm |
| December | 8°C | −3°C | 2.5°C | 85 mm |
NOAA publishes no 1991-2020 snowfall normal for this station, and no record within 25 miles keeps one, so snow is left out here rather than estimated.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00231674; 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.
Which months are mildest at Clearwater Dam?
Normal highs sit between 65°F and 85°F in April, May, 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 USC00231674.
When is the last frost at Clearwater Dam?
In Clearwater Dam, the last spring frost (32°F) comes after April 9 in half of years and after April 24 in one year in ten; the first autumn frost comes before October 26 in half of years and before October 12 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 91 year in 10 after April 24; 9 in 10 after March 24
- First autumn frost, half of years before
- October 261 year in 10 before October 12; 9 in 10 before November 7
NOAA puts the median frost-free season at 199 days, and the season without a hard freeze (28°F) at 222 days.
A hard freeze (28°F) comes after March 28 in half of springs and before November 4 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Clearwater Dam in zone 7a in ZIP code 63957, the nearest ZIP area.
Frost dates for every NOAA station in Missouri · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00231674; 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 at Clearwater Dam?
In a normal year in Clearwater Dam, 50 days a year reach 90°F (3 of them 100°F or more), 109 nights fall to 32°F or colder and 98 days bring measurable precipitation.
- Days at 90°F or more
- 50a normal year
- Days at 100°F or more
- 3a normal year
- Nights at 32°F or colder
- 109a normal year
- Days that stay below freezing
- 12high of 32°F or less
- Days with 0.01 inch of precipitation
- 98a normal year
The highest temperature in this station's record (since 1946) is 110°F, on July 17, 1980; the lowest is −19°F, on January 24, 1963.
The wettest calendar year on that record is 1982, with 67.63 in; the snowiest season is 1977–78, with 24.9 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00231674; records: ACIS (NOAA Regional Climate Centers), station USC00231674. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Clearwater Dam?
Over a year 75% of the sunlight that would reach the ground under clear skies gets through the clouds at Clearwater Dam, 4.3 kWh per square metre a day. June is the sunniest month (82%) and December the cloudiest (66%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 68% | 2.2 |
| February | 66% | 2.9 |
| March | 68% | 3.9 |
| April | 72% | 5.1 |
| May | 74% | 5.7 |
| June | 82% | 6.5 |
| July | 82% | 6.3 |
| August | 81% | 5.6 |
| September | 81% | 4.8 |
| October | 76% | 3.5 |
| November | 73% | 2.5 |
| December | 66% | 1.9 |
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 many heating and cooling degree days does Clearwater Dam record?
A normal year at Clearwater Dam brings 4,452 heating degree days, 17% fewer than the median U.S. place (5,373), and 1,392 cooling degree days, 53% more than 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 4,179 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 987 | 0 |
| February | 765 | 0 |
| March | 575 | 3 |
| April | 272 | 24 |
| May | 85 | 108 |
| June | 5 | 284 |
| July | 0 | 420 |
| August | 2 | 367 |
| September | 44 | 155 |
| October | 262 | 28 |
| November | 573 | 2 |
| December | 882 | 0 |
| Year (annual) | 4,452 | 1,392 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00231674. 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.
Have recent years at Clearwater Dam been warmer than normal?
Over 44 complete years from 1949 to 2021, the station's annual mean temperature rose at a fitted 1.7°F per century (+0.09°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Clearwater Dam's climate compare?
Clearwater Dam is warmer than 103 of the 134 places with their own NOAA record in Missouri, and wetter than 113. Across the 7,247 U.S. stations with normals, its annual mean of 56.5°F is warmer than 65%.
In the Köppen classification computed from these normals, Clearwater Dam 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 Clearwater Dam share this climate record?
9 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.
- Piedmont, MO1,869 people · 5 mi E
- Van Buren, MO775 people · 15 mi SW
- Ellington, MO766 people · 13 mi NW
- Ellsinore, MO417 people · 14 mi S
- Annapolis, MO245 people · 16 mi N
- Centerville, MO163 people · 23 mi NW
- Mill Spring, MO158 people · 7 mi SE
- Des Arc, MO129 people · 13 mi NE
- Hunter, MO60 people · 18 mi S
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 Clearwater Dam's climate
What is the coldest month at Clearwater Dam?
January, with a normal high of 43°F and a normal low of 23°F. The warmest is July (89°F by day, 68°F at night).
What is the rainiest month at Clearwater Dam?
April, with 5.30 in of precipitation in a normal year; the driest is February with 3.24 in.
What plant hardiness zone is Clearwater Dam in?
The USDA's 2023 map puts Clearwater Dam in zone 7a in ZIP code 63957, the nearest ZIP area.
How late can frost come at Clearwater Dam?
In half of years the last 32°F night comes after April 9; in one year in ten it comes after April 24. Waiting until April 24 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Missouri climateThe statewide normals and every place in the state
- Wappapello Dam, MO30 miles from this station, 56.8°F a year
- Eminence, MO32 miles from this station, 56.6°F a year
- Poplar Bluff, MO35 miles from this station, 58.6°F a year
- Winona, MO35 miles from this station, 54.0°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made