St. Louis weather in January: St. Louis, Missouri: normal highs, lows, rain and records for January
St. Louis in January has a normal high of 40°F and a normal low of 24°F, a daily mean of 32°F, holding near 40°F all month. Measurable precipitation falls on 9 days in a normal January, 2.59 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 5°C and low of −5°C, 66 mm of precipitation and 14 cm of snow in January.
- NOAA stationSt Louis Lambert International Airport
- Station IDUSW00013994
- Location38.75°N 90.37°W
- Elevation531 ft (162 m)
- From the center11 miles
- Population279,695
- Jan 40° 24°
- Feb 46° 28°
- Mar 57° 37°
- Apr 68° 47°
- May 77° 58°
- Jun 86° 67°
- Jul 90° 71°
- Aug 88° 69°
- Sep 81° 61°
- Oct 69° 49°
- Nov 56° 37°
- Dec 45° 29°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is St. Louis in January?
The normal high is 40°F and the normal low 24°F, for a daily mean of 32.1°F. January is 4.4°F cooler than December and 4.6°F cooler than February. January is the 12th warmest month of the year in St. Louis and the 10th wettest, and the snowiest. Across the month the normal high rises 1°F, from 41°F on January 1 to 42°F on January 31. From one year to the next January's mean temperature typically moves about 4.0°F either way (NOAA's standard deviation), so roughly two Januarys in three average between 28°F and 36°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 30%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| January 1 | 41°F | 25°F | 30% | 16% |
| January 8 | 40°F | 24°F | 30% | 16% |
| January 15 | 40°F | 23°F | 30% | 15% |
| January 22 | 40°F | 23°F | 30% | 15% |
| January 31 | 42°F | 24°F | 30% | 15% |
Every day of January: normal high, low and chance of precipitation (warmest afternoon January 31, coldest night January 16)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| January 1 | 41°F | 25°F | 30% | 16% | 9 h 30 min |
| January 2 | 41°F | 25°F | 30% | 16% | 9 h 30 min |
| January 3 | 41°F | 25°F | 30% | 16% | 9 h 30 min |
| January 4 | 41°F | 25°F | 30% | 16% | 9 h 30 min |
| January 5 | 40°F | 25°F | 30% | 16% | 9 h 30 min |
| January 6 | 40°F | 24°F | 30% | 16% | 9 h 30 min |
| January 7 | 40°F | 24°F | 30% | 16% | 9 h 30 min |
| January 8 | 40°F | 24°F | 30% | 16% | 9 h 40 min |
| January 9 | 40°F | 24°F | 30% | 16% | 9 h 40 min |
| January 10 | 40°F | 24°F | 30% | 16% | 9 h 40 min |
| January 11 | 40°F | 24°F | 30% | 16% | 9 h 40 min |
| January 12 | 40°F | 24°F | 30% | 16% | 9 h 40 min |
| January 13 | 40°F | 24°F | 30% | 16% | 9 h 40 min |
| January 14 | 40°F | 24°F | 30% | 16% | 9 h 40 min |
| January 15 | 40°F | 23°F | 30% | 15% | 9 h 40 min |
| January 16 | 40°F | 23°F | 30% | 15% | 9 h 50 min |
| January 17 | 40°F | 23°F | 30% | 15% | 9 h 50 min |
| January 18 | 40°F | 23°F | 30% | 15% | 9 h 50 min |
| January 19 | 40°F | 23°F | 30% | 15% | 9 h 50 min |
| January 20 | 40°F | 23°F | 30% | 15% | 9 h 50 min |
| January 21 | 40°F | 23°F | 30% | 15% | 9 h 50 min |
| January 22 | 40°F | 23°F | 30% | 15% | 9 h 50 min |
| January 23 | 40°F | 23°F | 30% | 15% | 10 h |
| January 24 | 41°F | 23°F | 30% | 15% | 10 h |
| January 25 | 41°F | 23°F | 30% | 15% | 10 h |
| January 26 | 41°F | 24°F | 30% | 15% | 10 h |
| January 27 | 41°F | 24°F | 30% | 15% | 10 h |
| January 28 | 41°F | 24°F | 30% | 15% | 10 h 10 min |
| January 29 | 41°F | 24°F | 30% | 15% | 10 h 10 min |
| January 30 | 42°F | 24°F | 30% | 15% | 10 h 10 min |
| January 31 | 42°F | 24°F | 30% | 15% | 10 h 10 min |
- Normal high
- 40°FJanuary average
- Normal low
- 24°FJanuary average
- Precipitation
- 2.59 inmonth total
- Days with precipitation
- 90.01 inch or more
- Snowfall
- 5.7 inmonth total
- Nights at 32°F or colder
- 24
- Daylight
- 9 h 30 min to 10 h 10 minJanuary 1 to January 31
- Sunshine
- 67%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00013994; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain or snow in St. Louis in January?
On a given January day the chance of 0.01 inch or more is 30% on average, highest around January 5 (30%). In all, 2.59 in falls on 9 days of a normal January, 1 of them with an inch or more.
In a normal January in St. Louis, 24 nights fall to freezing, 8 days stay below freezing all day and snowfall averages 5.7 inches.
Snow falls on 5 days in a normal January, and an inch or more covers the ground on 7 days.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00013994.
How humid and windy is St. Louis in January?
At 3 p.m. the normal temperature is 40°F with 52% relative humidity and a dew point of 24°F; at 6 a.m. it is 29°F with 74% humidity. The wind averages 9.5 mph, most often from the west-northwest in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 29°F | 22°F | 74% | 8.6 mph | 29% |
| 9 a.m. | 31°F | 23°F | 70% | 9.8 mph | 27% |
| noon | 37°F | 24°F | 58% | 10.7 mph | 23% |
| 3 p.m. | 40°F | 24°F | 52% | 11.3 mph | 26% |
| 6 p.m. | 37°F | 24°F | 59% | 9.3 mph | 24% |
| 9 p.m. | 34°F | 24°F | 66% | 9.1 mph | 38% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00013994. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for January in St. Louis?
The warmest January temperature on St. Louis's official record (since 1874) is 77°F, on January 24, 1950; the coldest is −22°F, on January 5, 1884. The wettest January brought 9.01 in (2005); the snowiest, 23.9 inches (1977).
The January mean against the 1991-2020 normal of 32.1°F: 2021 34.9°F (+2.8), 2022 29.3°F (−2.8), 2023 39.4°F (+7.3), 2024 31.9°F (−0.2), 2025 29.0°F (−3.1), 2026 29.9°F (−2.2). 2 of 6 ran warmer than normal.
| January | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 34.9°F | +2.8°F | 3.82 in |
| 2022 | 29.3°F | −2.8°F | 1.35 in |
| 2023 | 39.4°F | +7.3°F | 2.21 in |
| 2024 | 31.9°F | −0.2°F | 4.03 in |
| 2025 | 29.0°F | −3.1°F | 2.84 in |
| 2026 | 29.9°F | −2.2°F | 1.02 in |
Source: records: ACIS, NWS threaded record STLthr; recent months: ACIS, station USW00013994. Records and recent months use complete months only.
How does January in St. Louis compare across Missouri?
Across the 134 places PlainClimate covers in Missouri, January normal highs run from 32°F in Green City to 46°F in Neosho; St. Louis's is 40°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.