Jōetsu Weather in December
Average highs run from 9°C on December 1 to 3°C on December 31, and lows from 3°C to -2°C. Normal precipitation for the month is 198 mm over about 25 wet days.
December day by day
The normal high and low for each date, in °C.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
December at a glance
- Average high
- 5°C
- Average low
- 0°C
- Precipitation
- 198 mm
- Reanalysis high
- 20°CDec 5, 2004
- Reanalysis low
- -8°CDec 20, 1994
- Daylight
- 9 h 48 min to 9 h 39 min
- Cloud cover
- 86%
- Humidity
- 88%
- Dew point
- 1°C
- Wind
- 18.4 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 |
|---|---|---|---|---|---|
| Dec 1 | 9°C | 3°C | 16°C 1992 | -2°C 2012 | 75% |
| Dec 2 | 8°C | 3°C | 15°C 1994 | -3°C 2012 | 76% |
| Dec 3 | 8°C | 3°C | 14°C 2018 | -2°C 1997 | 76% |
| Dec 4 | 8°C | 2°C | 19°C 2018 | -1°C 1997 | 77% |
| Dec 5 | 8°C | 2°C | 20°C 2004 | -3°C 2006 | 77% |
| Dec 6 | 7°C | 2°C | 14°C 2010 | -3°C 2014 | 78% |
| Dec 7 | 7°C | 2°C | 15°C 1997 | -2°C 2014 | 78% |
| Dec 8 | 7°C | 2°C | 12°C 1992 | -3°C 2005 | 78% |
| Dec 9 | 7°C | 1°C | 13°C 2008 | -2°C 2012 | 78% |
| Dec 10 | 6°C | 1°C | 13°C 2004 | -4°C 2014 | 80% |
| Dec 11 | 6°C | 1°C | 16°C 2015 | -3°C 2002 | 82% |
| Dec 12 | 6°C | 1°C | 12°C 2004 | -3°C 2000 | 81% |
| Dec 13 | 6°C | 1°C | 11°C 2015 | -4°C 2012 | 80% |
| Dec 14 | 5°C | 1°C | 11°C 2015 | -5°C 2012 | 81% |
| Dec 15 | 5°C | 0°C | 14°C 2015 | -5°C 2002 | 80% |
| Dec 16 | 5°C | 0°C | 11°C 1996 | -5°C 1994 | 80% |
| Dec 17 | 5°C | 0°C | 13°C 2019 | -5°C 2014 | 80% |
| Dec 18 | 5°C | 0°C | 10°C 2004 | -5°C 2005 | 79% |
| Dec 19 | 5°C | 0°C | 11°C 1997 | -6°C 1994 | 80% |
| Dec 20 | 5°C | 0°C | 13°C 2004 | -8°C 1994 | 80% |
| Dec 21 | 4°C | 0°C | 13°C 2008 | -5°C 2011 | 80% |
| Dec 22 | 4°C | -1°C | 13°C 2016 | -6°C 1994 | 80% |
| Dec 23 | 4°C | -1°C | 11°C 1991 | -5°C 1993 | 80% |
| Dec 24 | 4°C | -1°C | 10°C 1991 | -6°C 2012 | 81% |
| Dec 25 | 4°C | -1°C | 8°C 2019 | -7°C 2012 | 80% |
| Dec 26 | 4°C | -1°C | 9°C 2016 | -6°C 1995 | 80% |
| Dec 27 | 4°C | -1°C | 9°C 1997 | -6°C 2012 | 81% |
| Dec 28 | 4°C | -1°C | 9°C 2007 | -8°C 1995 | 82% |
| Dec 29 | 3°C | -1°C | 10°C 2007 | -5°C 2005 | 81% |
| Dec 30 | 3°C | -1°C | 8°C 2019 | -7°C 2000 | 81% |
| Dec 31 | 3°C | -2°C | 9°C 1996 | -5°C 2011 | 82% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT+9).
- December 1
- sunrise 6:42 AM, sunset 4:30 PM
- December 31
- sunrise 7:00 AM, sunset 4:39 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.