Alton Weather in January
Average highs run from 44°F on January 1 to 45°F on January 31, and lows from 23°F to 22°F. Normal precipitation for the month is 2.96 in over about 6 wet days.
January day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
January at a glance
- Average high
- 44°F
- Average low
- 22°F
- Precipitation
- 2.96 in
- Snowfall
- 1.7 in
- Record high
- 74°FJan 23, 2002
- Record low
- -4°FJan 17, 1997
- Chance of a freeze
- 100%
- Daylight
- 9 h 43 min to 10 h 22 min
- Cloud cover
- 62%
- Humidity
- 83%
- Dew point
- 29°F
- Wind
- 5.6 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.
| Date | Normal high | Normal low | Record high | Record low | Chance wet | Chance of snow |
|---|---|---|---|---|---|---|
| Jan 1 | 44°F | 23°F | 64°F 2006 | -1°F 2018 | 21% | 3% |
| Jan 2 | 44°F | 23°F | 70°F 2004 | -2°F 2018 | 21% | 3% |
| Jan 3 | 44°F | 23°F | 73°F 2004 | 6°F 2001 | 21% | 3% |
| Jan 4 | 44°F | 23°F | 70°F 1997 | 1°F 1999 | 21% | 3% |
| Jan 5 | 43°F | 23°F | 63°F 1998 | 1°F 1999 | 21% | 3% |
| Jan 6 | 43°F | 23°F | 73°F 2026 | -4°F 2014 | 21% | 3% |
| Jan 7 | 43°F | 23°F | 69°F 2019 | -4°F 2014 | 21% | 3% |
| Jan 8 | 43°F | 23°F | 71°F 2006 | 1°F 2015 | 21% | 3% |
| Jan 9 | 43°F | 23°F | 68°F 2002 | 4°F 2010 | 21% | 3% |
| Jan 10 | 43°F | 23°F | 71°F 2017 | -1°F 2010 | 21% | 3% |
| Jan 11 | 43°F | 23°F | 69°F 2017 | -3°F 1997 | 21% | 3% |
| Jan 12 | 43°F | 22°F | 68°F 2000 | 0°F 1997 | 21% | 3% |
| Jan 13 | 43°F | 22°F | 70°F 2026 | -1°F 1997 | 21% | 3% |
| Jan 14 | 43°F | 22°F | 63°F 2016 | 5°F 1997 | 21% | 3% |
| Jan 15 | 43°F | 22°F | 63°F 2020 | 4°F 2009 | 21% | 3% |
| Jan 16 | 44°F | 22°F | 65°F 2023 | -3°F 2018 | 21% | 4% |
| Jan 17 | 44°F | 22°F | 67°F 2023 | -4°F 1997 | 21% | 4% |
| Jan 18 | 44°F | 22°F | 62°F 2015 | 1°F 2003 | 21% | 4% |
| Jan 19 | 44°F | 22°F | 66°F 2015 | 7°F 2025 | 21% | 4% |
| Jan 20 | 44°F | 22°F | 66°F 2005 | 2°F 2025 | 21% | 4% |
| Jan 21 | 44°F | 22°F | 68°F 2017 | 5°F 2022 | 21% | 4% |
| Jan 22 | 44°F | 22°F | 62°F 2009 | 10°F 2022 | 22% | 4% |
| Jan 23 | 44°F | 22°F | 74°F 2002 | 1°F 2003 | 22% | 4% |
| Jan 24 | 44°F | 22°F | 63°F 2022 | 1°F 2003 | 22% | 4% |
| Jan 25 | 44°F | 22°F | 66°F 2005 | 5°F 2026 | 22% | 4% |
| Jan 26 | 44°F | 22°F | 67°F 2014 | -4°F 2026 | 22% | 4% |
| Jan 27 | 45°F | 22°F | 68°F 1999 | 11°F 2004 | 22% | 4% |
| Jan 28 | 45°F | 22°F | 72°F 2002 | 2°F 1997 | 22% | 4% |
| Jan 29 | 45°F | 22°F | 72°F 2002 | 2°F 2014 | 22% | 4% |
| Jan 30 | 45°F | 22°F | 68°F 2016 | 4°F 2004 | 22% | 4% |
| Jan 31 | 45°F | 22°F | 72°F 2016 | 4°F 2026 | 22% | 4% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CST).
- January 1
- sunrise 7:18 AM, sunset 5:01 PM
- January 31
- sunrise 7:08 AM, sunset 5:30 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00230127 (Alton), public domain. Records: NOAA GHCN-Daily, station USW00053901, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.