Cornwall Weather in January
Average highs run from -4°C on January 1 to -5°C on January 31, and lows from -12°C to -15°C. Normal precipitation for the month is 68 mm over about 16 wet days.
January day by day
The normal high and low for each date, in °C.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
January at a glance
- Average high
- -5°C
- Average low
- -15°C
- Precipitation
- 68 mm
- Reanalysis high
- 13°CJan 15, 1995
- Reanalysis low
- -38°CJan 16, 1994
- Daylight
- 8 h 51 min to 9 h 45 min
- Cloud cover
- 69%
- Humidity
- 92%
- Dew point
- -11°C
- Wind
- 13.3 km/h
Every day of the month
A wet day has at least 1 mm of precipitation in the reanalysis.
| Date | Normal high | Normal low | Reanalysis high | Reanalysis low | Chance wet |
|---|---|---|---|---|---|
| Jan 1 | -4°C | -12°C | 7°C 2005 | -33°C 1998 | 50% |
| Jan 2 | -4°C | -13°C | 6°C 2000 | -29°C 2014 | 51% |
| Jan 3 | -4°C | -13°C | 7°C 2000 | -30°C 2014 | 51% |
| Jan 4 | -4°C | -13°C | 11°C 2000 | -35°C 1996 | 52% |
| Jan 5 | -4°C | -13°C | 10°C 2007 | -26°C 2016 | 53% |
| Jan 6 | -4°C | -13°C | 10°C 2007 | -32°C 1994 | 53% |
| Jan 7 | -4°C | -13°C | 9°C 2008 | -29°C 2018 | 52% |
| Jan 8 | -5°C | -14°C | 12°C 2008 | -30°C 2004 | 51% |
| Jan 9 | -5°C | -14°C | 11°C 2008 | -34°C 2004 | 51% |
| Jan 10 | -5°C | -14°C | 5°C 2016 | -32°C 2004 | 52% |
| Jan 11 | -5°C | -14°C | 11°C 2020 | -28°C 1995 | 52% |
| Jan 12 | -5°C | -14°C | 11°C 2018 | -23°C 1992 | 52% |
| Jan 13 | -5°C | -14°C | 12°C 2005 | -34°C 1999 | 50% |
| Jan 14 | -5°C | -15°C | 12°C 2005 | -34°C 1999 | 48% |
| Jan 15 | -6°C | -15°C | 13°C 1995 | -36°C 2004 | 46% |
| Jan 16 | -5°C | -15°C | 8°C 1995 | -38°C 1994 | 46% |
| Jan 17 | -5°C | -15°C | 2°C 1996 | -31°C 1992 | 46% |
| Jan 18 | -6°C | -15°C | 6°C 1996 | -29°C 2003 | 46% |
| Jan 19 | -6°C | -15°C | 11°C 1996 | -33°C 1994 | 45% |
| Jan 20 | -6°C | -16°C | 6°C 1995 | -25°C 2020 | 43% |
| Jan 21 | -6°C | -16°C | 5°C 2006 | -29°C 2005 | 42% |
| Jan 22 | -6°C | -16°C | 4°C 1997 | -33°C 1991 | 42% |
| Jan 23 | -6°C | -16°C | 5°C 1999 | -31°C 2011 | 41% |
| Jan 24 | -6°C | -16°C | 6°C 1999 | -33°C 2011 | 41% |
| Jan 25 | -6°C | -15°C | 8°C 2010 | -32°C 1991 | 40% |
| Jan 26 | -6°C | -15°C | 4°C 2016 | -35°C 1994 | 39% |
| Jan 27 | -6°C | -15°C | 5°C 1996 | -36°C 1994 | 38% |
| Jan 28 | -6°C | -15°C | 6°C 2002 | -28°C 2019 | 38% |
| Jan 29 | -5°C | -15°C | 2°C 2008 | -26°C 2007 | 40% |
| Jan 30 | -5°C | -15°C | 11°C 2013 | -30°C 1997 | 40% |
| Jan 31 | -5°C | -15°C | 9°C 2013 | -32°C 1994 | 39% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (EST).
- January 1
- sunrise 7:37 AM, sunset 4:28 PM
- January 31
- sunrise 7:20 AM, sunset 5:05 PM
Other months
Sources
Cloud, humidity, wind and sunshine, and temperature and precipitation: 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.