St Louis Science Center, Missouri climate: Climate normals at a NOAA weather station
St Louis Science Center's normal year runs from 25°F January nights to 90°F July afternoons, with 43.9 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 14.4°C, January lows of −4°C, July highs of 32°C, 1,115 mm of precipitation a year.
- NOAA stationSt Louis Science Center
- Station IDUSC00237452
- Location38.63°N 90.27°W
- Elevation515 ft (157 m)
On October 23, the normal high in St Louis Science Center is 67°F and the normal low 47°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for St Louis Science Center.
- Jan 41° 25°
- Feb 46° 28°
- Mar 56° 38°
- Apr 68° 48°
- May 77° 59°
- Jun 86° 67°
- Jul 90° 72°
- Aug 89° 70°
- Sep 82° 62°
- Oct 70° 50°
- Nov 56° 39°
- Dec 45° 30°
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 St Louis Science Center each month?
July is the warmest month, with normal highs of 90°F; January the coldest, with normal lows of 25°F. The most precipitation falls in May (4.90 in), the least in February (2.28 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 41°F | 25°F | 32.6°F | 2.71 | – | <1 | 24 | 9 h 40 min |
| February | 46°F | 28°F | 37.3°F | 2.28 | – | <1 | 18 | 10 h 40 min |
| March | 56°F | 38°F | 47.0°F | 3.61 | – | <1 | 10 | 11 h 50 min |
| April | 68°F | 48°F | 57.8°F | 4.83 | – | <1 | 1 | 13 h 10 min |
| May | 77°F | 59°F | 67.9°F | 4.90 | – | 2 | <1 | 14 h 10 min |
| June | 86°F | 67°F | 76.7°F | 4.74 | – | 10 | <1 | 14 h 50 min |
| July | 90°F | 72°F | 80.6°F | 4.21 | – | 16 | <1 | 14 h 40 min |
| August | 89°F | 70°F | 79.2°F | 3.75 | – | 13 | <1 | 13 h 40 min |
| September | 82°F | 62°F | 71.6°F | 3.41 | – | 5 | <1 | 12 h 30 min |
| October | 70°F | 50°F | 59.9°F | 3.20 | – | <1 | <1 | 11 h 20 min |
| November | 56°F | 39°F | 47.6°F | 3.69 | – | <1 | 8 | 10 h 10 min |
| December | 45°F | 30°F | 37.4°F | 2.58 | – | <1 | 18 | 9 h 30 min |
| Year (annual) | 67°F | 49°F | 58.0°F | 43.91 | – | 47 | 79 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 5°C | −4°C | 0.3°C | 69 mm |
| February | 8°C | −2°C | 2.9°C | 58 mm |
| March | 13°C | 3°C | 8.3°C | 92 mm |
| April | 20°C | 9°C | 14.3°C | 123 mm |
| May | 25°C | 15°C | 19.9°C | 124 mm |
| June | 30°C | 20°C | 24.8°C | 120 mm |
| July | 32°C | 22°C | 27.0°C | 107 mm |
| August | 31°C | 21°C | 26.2°C | 95 mm |
| September | 28°C | 17°C | 22.0°C | 87 mm |
| October | 21°C | 10°C | 15.5°C | 81 mm |
| November | 13°C | 4°C | 8.7°C | 94 mm |
| December | 7°C | −1°C | 3.0°C | 66 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Cahokia (6 miles away), gets 14 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00237452; 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 St Louis Science Center?
Normal highs sit between 65°F and 85°F in April, May, September and October.
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 USC00237452.
When is the last frost at St Louis Science Center?
In St Louis Science Center, the last spring frost (32°F) comes after April 1 in half of years and after April 18 in one year in ten; the first autumn frost comes before November 4 in half of years and before October 24 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 11 year in 10 after April 18; 9 in 10 after March 14
- First autumn frost, half of years before
- November 41 year in 10 before October 24; 9 in 10 before November 21
NOAA puts the median frost-free season at 218 days, and the season without a hard freeze (28°F) at 239 days.
A hard freeze (28°F) comes after March 22 in half of springs and before November 15 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts St Louis Science Center in zone 7a in ZIP code 63110, 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 USC00237452; 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 St Louis Science Center?
In a normal year in St Louis Science Center, 47 days a year reach 90°F (3 of them 100°F or more) and 79 nights fall to 32°F or colder.
- Days at 90°F or more
- 47a normal year
- Days at 100°F or more
- 3a normal year
- Nights at 32°F or colder
- 79a normal year
- Days that stay below freezing
- 19high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USC00237452.
How sunny is it at St Louis Science Center?
Over a year 75% of the sunlight that would reach the ground under clear skies gets through the clouds at St Louis Science Center, 4.2 kWh per square metre a day. July is the sunniest month (82%) and December the cloudiest (66%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 67% | 2.1 |
| February | 66% | 2.8 |
| March | 67% | 3.8 |
| April | 73% | 5.0 |
| May | 74% | 5.6 |
| June | 81% | 6.4 |
| July | 82% | 6.3 |
| August | 81% | 5.6 |
| September | 81% | 4.8 |
| October | 76% | 3.4 |
| November | 72% | 2.4 |
| December | 66% | 1.8 |
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 St Louis Science Center record?
A normal year at St Louis Science Center brings 4,292 heating degree days, 20% fewer than the median U.S. place (5,373), and 1,769 cooling degree days, 95% 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 4,703 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,004 | 0 |
| February | 776 | 0 |
| March | 565 | 9 |
| April | 255 | 41 |
| May | 66 | 157 |
| June | 5 | 356 |
| July | 0 | 484 |
| August | 1 | 441 |
| September | 28 | 226 |
| October | 211 | 52 |
| November | 527 | 5 |
| December | 854 | 0 |
| Year (annual) | 4,292 | 1,769 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00237452. 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.
How does St Louis Science Center's climate compare?
St Louis Science Center is warmer than 122 of the 134 places with their own NOAA record in Missouri, and wetter than 65. Across the 7,247 U.S. stations with normals, its annual mean of 58.0°F is warmer than 69%.
In the Köppen classification computed from these normals, St Louis Science Center 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 Louis Science Center share this climate record?
22 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.
- Granite City, IL26,854 people · 10 mi NE
- Edwardsville, IL26,715 people · 19 mi NE
- Collinsville, IL23,766 people · 15 mi E
- East St. Louis, IL17,808 people · 8 mi E
- Fairview Heights, IL16,115 people · 15 mi E
- Swansea, IL14,445 people · 16 mi E
- Glen Carbon, IL13,883 people · 18 mi NE
- Troy, IL11,810 people · 21 mi E
- Columbia, IL10,919 people · 12 mi S
- Maryville, IL8,352 people · 18 mi E
- Pontoon Beach, IL5,845 people · 13 mi NE
- Caseyville, IL4,395 people · 13 mi E
- Millstadt, IL3,957 people · 16 mi SE
- Dupo, IL3,797 people · 8 mi S
- Madison, IL3,060 people · 10 mi NE
- Washington Park, IL2,481 people · 10 mi E
- Fairmont City, IL2,169 people · 9 mi E
- Venice, IL1,452 people · 6 mi NE
- Mitchell, IL847 people · 14 mi NE
- Brooklyn, IL623 people · 6 mi E
- East Carondelet, IL373 people · 7 mi S
- Sauget, IL134 people · 7 mi SE
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 Louis Science Center's climate
What is the coldest month at St Louis Science Center?
January, with a normal high of 41°F and a normal low of 25°F. The warmest is July (90°F by day, 72°F at night).
Does it snow at St Louis Science Center?
Yes. NOAA publishes no 1991-2020 snowfall normal for the station; the nearest record that keeps one, Cahokia (6 miles away), records 14 inches of snow in a normal year.
What is the rainiest month at St Louis Science Center?
May, with 4.90 in of precipitation in a normal year; the driest is February with 2.28 in.
What plant hardiness zone is St Louis Science Center in?
The USDA's 2023 map puts St Louis Science Center in zone 7a in ZIP code 63110, the nearest ZIP area.
How late can frost come at St Louis Science Center?
In half of years the last 32°F night comes after April 1; in one year in ten it comes after April 18. Waiting until April 18 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Missouri climateThe statewide normals and every place in the state
- Cahokia, IL6 miles from this station, 56.2°F a year
- Cahokia Heights, IL7 miles from this station, 56.5°F a year
- St. Louis, MO10 miles from this station, 57.4°F a year
- Alton, IL17 miles from this station, 55.7°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made