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Saint Louis, Missouri Climate & Temperature

  • Saint Louis, Missouri, Usa is at 3845'N, 9022'W, 101 m (331 ft). See map.
  • Saint Louis, Missouri has a humid subtropical climate that is mild with no dry season, constantly moist (year-round rainfall). Summers are hot and muggy with thunderstorms. Winters are mild with precipitation from mid-latitude cyclones. Seasonality is moderate. (Kppen-Geiger classification: Cfa).
  • According to the Holdridge life zones system of bioclimatic classification Saint Louis, Missouri is situated in or near the cool temperate moist forest biome.
  • The mean annual temperature is 13 degrees Celsius (55.3 degrees Fahrenheit). See the temperatures page for a monthly breakdown and the fixed scale graph.
  • Average monthly temperatures vary by 25.5 °C (45.9°F). This indicates that the continentality type is continental, subtype subcontinental. Saint Louis, Missouri Climate Graph
  • In the winter time records indicate temperatures by day reach 6°C (42.8°F) on average falling to -4°C (24.8°F) overnight.
  • In spring time temperatures climb reaching 18.3°C (65°F) generally in the afternoon with overnight lows of 6.3°C (43.4°F).
  • During summer average high temperatures are 31°C (87.8°F) and average low temperatures are 18.3°C (65°F).
  • Come autumn/ fall temperatures decrease achieving average highs of 20°C (68°F) during the day and lows of 7.7°C (45.8°F) generally shortly after sunrise.
  • Total annual Precipitation averages 900 mm (35.4 inches) which is equivalent to 900 Litres/m (22.07 Gallons/ft).
  • On average there are 2737 hours of sunshine per year. Visit the sunshine and daylight section to check monthly details including how high in the sky the sun reaches each month.
  • Were you to burrow down through the centre of the Earth from Saint Louis, Missouri you would pop up nearest to the climate station at Amsterdam Island, French Southern Lands where you would find a Marine west coast climate.

Saint Louis, Missouri Climate Table

  Climate Variable Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
 
Average Max Temperature °C ( °F) 5 (41) 7 (45) 12 (54) 19 (66) 24 (75) 30 (86) 32 (90) 31 (88) 27 (81) 21 (70) 12 (54) 6 (43) 19 (66)
 
Average Temperature °C ( °F) 0 (32) 2 (35) 6 (43) 13 (55) 18 (64) 24 (74) 26 (78) 25 (77) 21 (69) 15 (58) 7 (44) 2 (35) 13 (55)
 
Average Min Temperature °C ( °F) -5 (23) -4 (25) 0 (32) 7 (45) 12 (54) 17 (63) 19 (66) 19 (66) 14 (57) 8 (46) 1 (34) -3 (27) 7 (45)
 
Average Precipitation mm (in) 51 (2) 51 (2) 79 (3) 94 (4) 94 (4) 109 (4) 84 (3) 76 (3) 71 (3) 74 (3) 66 (3) 51 (2) 900 (35)
Number of Wet Days (probability of rain on a day %) 8 (26) 8 (28) 11 (35) 11 (37) 12 (39) 10 (33) 8 (26) 8 (26) 7 (23) 7 (23) 8 (27) 8 (26) 106 (29)
Average Sunlight Hours/ Day 4h 17' 5h 37' 6h 52' 7h 46' 9h 00' 10h 18' 10h 17' 9h 11' 8h 42' 7h 34' 5h 56' 4h 17' 7h 29'
Average Daylight Hours/ Day 9h 46' 10h 40' 11h 53' 13h 10' 14h 15' 14h 49' 14h 34' 13h 38' 12h 23' 11h 06' 10h 01' 9h 29' 12h 00'
Percentage of Sunny (Cloudy) Daylight Hours 45 (55) 53 (47) 59 (41) 60 (40) 64 (36) 70 (30) 71 (29) 68 (32) 71 (29) 69 (31) 60 (40) 46 (54) 62 (38)
Sun altitude at solar noon on the 21st day (). 31.4 40.8 51.6 63.3 71.5 74.7 71.6 63.2 51.8 40.3 31.2 27.8 51.6

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