Truman Dam & Reservoir, Missouri climate: Climate normals at a NOAA weather station
Truman Dam & Reservoir's normal year runs from 22°F January nights to 90°F July afternoons, with 43.5 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 13.6°C, January lows of −6°C, July highs of 32°C, 1,106 mm of precipitation a year.
- NOAA stationTruman Dam & Reservoir
- Station IDUSC00238466
- Location38.26°N 93.41°W
- Elevation754 ft (230 m)
On October 23, the normal high in Truman Dam & Reservoir is 67°F and the normal low 44°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 Truman Dam & Reservoir.
- Jan 43° 22°
- Feb 47° 25°
- Mar 57° 34°
- Apr 68° 44°
- May 76° 55°
- Jun 85° 65°
- Jul 90° 69°
- Aug 89° 67°
- Sep 82° 59°
- Oct 70° 46°
- Nov 57° 36°
- 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 Truman Dam & Reservoir each month?
July is the warmest month, with normal highs of 90°F; January the coldest, with normal lows of 22°F. The most precipitation falls in May (5.52 in), the least in January (1.75 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 43°F | 22°F | 32.2°F | 1.75 | 7 | <1 | 27 | 9 h 50 min |
| February | 47°F | 25°F | 36.0°F | 2.14 | 6 | <1 | 23 | 10 h 50 min |
| March | 57°F | 34°F | 45.4°F | 3.04 | 10 | <1 | 15 | 11 h 50 min |
| April | 68°F | 44°F | 55.7°F | 4.60 | 12 | <1 | 3 | 13 h 10 min |
| May | 76°F | 55°F | 65.6°F | 5.52 | 12 | 1 | <1 | 14 h 10 min |
| June | 85°F | 65°F | 74.9°F | 5.24 | 10 | 7 | <1 | 14 h 50 min |
| July | 90°F | 69°F | 79.6°F | 4.70 | 8 | 16 | <1 | 14 h 40 min |
| August | 89°F | 67°F | 78.0°F | 3.96 | 8 | 14 | <1 | 13 h 40 min |
| September | 82°F | 59°F | 70.1°F | 4.11 | 8 | 5 | <1 | 12 h 30 min |
| October | 70°F | 46°F | 58.1°F | 3.45 | 9 | <1 | 2 | 11 h 20 min |
| November | 57°F | 36°F | 46.5°F | 3.06 | 7 | <1 | 11 | 10 h 10 min |
| December | 46°F | 27°F | 36.5°F | 1.97 | 6 | <1 | 24 | 9 h 30 min |
| Year (annual) | 67°F | 46°F | 56.5°F | 43.54 | 102 | 43 | 105 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 6°C | −6°C | 0.1°C | 44 mm |
| February | 8°C | −4°C | 2.2°C | 54 mm |
| March | 14°C | 1°C | 7.4°C | 77 mm |
| April | 20°C | 7°C | 13.2°C | 117 mm |
| May | 24°C | 13°C | 18.7°C | 140 mm |
| June | 29°C | 18°C | 23.8°C | 133 mm |
| July | 32°C | 21°C | 26.4°C | 119 mm |
| August | 32°C | 20°C | 25.6°C | 101 mm |
| September | 28°C | 15°C | 21.2°C | 104 mm |
| October | 21°C | 8°C | 14.5°C | 88 mm |
| November | 14°C | 2°C | 8.1°C | 78 mm |
| December | 8°C | −3°C | 2.5°C | 50 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Cole Camp (18 miles away), gets 18 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00238466; 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 Truman Dam & Reservoir?
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 (8).
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 USC00238466.
When is the last frost at Truman Dam & Reservoir?
In Truman Dam & Reservoir, the last spring frost (32°F) comes after April 7 in half of years and after April 22 in one year in ten; the first autumn frost comes before October 30 in half of years and before October 16 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 71 year in 10 after April 22; 9 in 10 after March 21
- First autumn frost, half of years before
- October 301 year in 10 before October 16; 9 in 10 before November 13
NOAA puts the median frost-free season at 205 days, and the season without a hard freeze (28°F) at 226 days.
A hard freeze (28°F) comes after March 29 in half of springs and before November 10 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Truman Dam & Reservoir in zone 6b in ZIP code 65355, 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 USC00238466; 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 Truman Dam & Reservoir?
In a normal year in Truman Dam & Reservoir, 43 days a year reach 90°F (3 of them 100°F or more), 105 nights fall to 32°F or colder and 102 days bring measurable precipitation.
- Days at 90°F or more
- 43a normal year
- Days at 100°F or more
- 3a normal year
- Nights at 32°F or colder
- 105a normal year
- Days that stay below freezing
- 18high of 32°F or less
- Days with 0.01 inch of precipitation
- 102a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00238466.
How sunny is it at Truman Dam & Reservoir?
Over a year 76% of the sunlight that would reach the ground under clear skies gets through the clouds at Truman Dam & Reservoir, 4.3 kWh per square metre a day. July is the sunniest month (83%) and March the cloudiest (68%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 69% | 2.2 |
| February | 68% | 3.0 |
| March | 68% | 3.9 |
| April | 71% | 5.0 |
| May | 73% | 5.7 |
| June | 81% | 6.6 |
| July | 83% | 6.5 |
| August | 81% | 5.7 |
| September | 82% | 4.8 |
| October | 76% | 3.5 |
| November | 73% | 2.5 |
| December | 69% | 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 Truman Dam & Reservoir record?
A normal year at Truman Dam & Reservoir brings 4,568 heating degree days, 15% fewer than the median U.S. place (5,373), and 1,523 cooling degree days, 68% 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 4,299 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,017 | 0 |
| February | 813 | 0 |
| March | 609 | 3 |
| April | 300 | 21 |
| May | 93 | 112 |
| June | 6 | 303 |
| July | 0 | 451 |
| August | 1 | 405 |
| September | 40 | 191 |
| October | 249 | 35 |
| November | 559 | 3 |
| December | 882 | 0 |
| Year (annual) | 4,568 | 1,523 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00238466. 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 Truman Dam & Reservoir been warmer than normal?
2025 averaged 56.8°F, 0.3°F above the 1991-2020 normal of 56.5°F. 3 of the 3 complete years since 2023 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2023 | 58.0°F | +1.5°F | 29.69 |
| 2024 | 58.5°F | +2.0°F | 37.17 |
| 2025 | 56.8°F | +0.3°F | 34.96 |
Over 90 complete years from 1895 to 2025, the station's annual mean temperature rose at a fitted 1.0°F per century (+0.06°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00238466; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Truman Dam & Reservoir's climate compare?
Truman Dam & Reservoir is warmer than 103 of the 134 places with their own NOAA record in Missouri, and wetter than 63. 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, Truman Dam & Reservoir 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 Truman Dam & Reservoir share this climate record?
4 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.
- Warsaw, MO2,337 people · 3 mi E
- Bent Tree Harbor, MO342 people · 4 mi W
- White Branch, MO210 people · 4 mi SE
- Tightwad, MO60 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 Truman Dam & Reservoir's climate
What is the coldest month at Truman Dam & Reservoir?
January, with a normal high of 43°F and a normal low of 22°F. The warmest is July (90°F by day, 69°F at night).
Does it snow at Truman Dam & Reservoir?
Yes. NOAA publishes no 1991-2020 snowfall normal for the station; the nearest record that keeps one, Cole Camp (18 miles away), records 18 inches of snow in a normal year.
What is the rainiest month at Truman Dam & Reservoir?
May, with 5.52 in of precipitation in a normal year; the driest is January with 1.75 in.
What plant hardiness zone is Truman Dam & Reservoir in?
The USDA's 2023 map puts Truman Dam & Reservoir in zone 6b in ZIP code 65355, the nearest ZIP area.
How late can frost come at Truman Dam & Reservoir?
In half of years the last 32°F night comes after April 7; in one year in ten it comes after April 22. Waiting until April 22 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Missouri climateThe statewide normals and every place in the state
- Cole Camp, MO18 miles from this station, 54.1°F a year
- Windsor, MO20 miles from this station, 55.7°F a year
- Osceola, MO22 miles from this station, 56.3°F a year
- Clinton, MO22 miles from this station, 55.3°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made