Thornton Weather in January
Average highs run from 56°F on January 1 to 59°F on January 31, and lows from 39°F to 40°F. Normal precipitation for the month is 3.51 in over about 13 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
- 57°F
- Average low
- 40°F
- Precipitation
- 3.51 in
- Record high
- 76°FJan 24, 2014
- Record low
- 20°FJan 5, 1950
- Chance of a freeze
- 77%
- Daylight
- 9 h 35 min to 10 h 17 min
- Cloud cover
- 60%
- Humidity
- 78%
- Dew point
- 40°F
- Wind
- 6.0 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Jan 1 | 56°F | 39°F | 65°F 2018 | 23°F 1979 | 39% |
| Jan 2 | 56°F | 39°F | 67°F 2014 | 25°F 1976 | 39% |
| Jan 3 | 56°F | 39°F | 66°F 2014 | 24°F 1950 | 39% |
| Jan 4 | 56°F | 39°F | 68°F 2014 | 23°F 1949 | 39% |
| Jan 5 | 56°F | 39°F | 68°F 1948 | 20°F 1950 | 39% |
| Jan 6 | 56°F | 39°F | 64°F 1966 | 24°F 1950 | 39% |
| Jan 7 | 56°F | 39°F | 67°F 2015 | 25°F 1950 | 39% |
| Jan 8 | 56°F | 39°F | 69°F 1990 | 28°F 1955 | 39% |
| Jan 9 | 56°F | 39°F | 69°F 1953 | 28°F 1946 | 39% |
| Jan 10 | 56°F | 39°F | 66°F 1962 | 25°F 1949 | 39% |
| Jan 11 | 56°F | 39°F | 67°F 1959 | 21°F 1949 | 39% |
| Jan 12 | 56°F | 39°F | 74°F 2009 | 24°F 2007 | 40% |
| Jan 13 | 56°F | 40°F | 66°F 2009 | 22°F 1949 | 40% |
| Jan 14 | 56°F | 40°F | 66°F 2014 | 22°F 2007 | 40% |
| Jan 15 | 56°F | 40°F | 68°F 2009 | 21°F 2007 | 40% |
| Jan 16 | 56°F | 40°F | 70°F 2021 | 23°F 2007 | 40% |
| Jan 17 | 57°F | 40°F | 71°F 2014 | 24°F 1963 | 40% |
| Jan 18 | 57°F | 40°F | 74°F 2021 | 25°F 2007 | 40% |
| Jan 19 | 57°F | 40°F | 70°F 1991 | 24°F 1947 | 40% |
| Jan 20 | 57°F | 40°F | 69°F 2014 | 25°F 1963 | 40% |
| Jan 21 | 57°F | 40°F | 70°F 2014 | 26°F 1963 | 40% |
| Jan 22 | 57°F | 40°F | 71°F 2011 | 25°F 1962 | 40% |
| Jan 23 | 57°F | 40°F | 69°F 2014 | 29°F 1949 | 40% |
| Jan 24 | 58°F | 40°F | 76°F 2014 | 25°F 1962 | 40% |
| Jan 25 | 58°F | 40°F | 74°F 2014 | 25°F 1962 | 40% |
| Jan 26 | 58°F | 40°F | 67°F 1947 | 26°F 1950 | 40% |
| Jan 27 | 58°F | 40°F | 66°F 1988 | 27°F 1949 | 40% |
| Jan 28 | 58°F | 40°F | 71°F 2024 | 25°F 1975 | 40% |
| Jan 29 | 58°F | 40°F | 71°F 2024 | 25°F 1979 | 40% |
| Jan 30 | 59°F | 40°F | 69°F 1976 | 25°F 1972 | 40% |
| Jan 31 | 59°F | 40°F | 74°F 2015 | 27°F 1946 | 40% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (PST).
- January 1
- sunrise 7:22 AM, sunset 4:57 PM
- January 31
- sunrise 7:11 AM, sunset 5:28 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00045032 (Lodi), public domain. Records: NOAA GHCN-Daily, station USW00023232, 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.