Iwamizawa Weather in December
Average highs run from 2°C on December 1 to -3°C on December 31, and lows from -5°C to -10°C. Normal precipitation for the month is 105 mm over about 22 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
- -1°C
- Average low
- -8°C
- Precipitation
- 105 mm
- Reanalysis high
- 10°CDec 5, 2008
- Reanalysis low
- -20°CDec 31, 2020
- Daylight
- 9 h 14 min to 9 h 02 min
- Cloud cover
- 74%
- Humidity
- 91%
- Dew point
- -6°C
- Wind
- 15.5 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 | 2°C | -5°C | 9°C 1991 | -9°C 1998 | 68% |
| Dec 2 | 1°C | -5°C | 9°C 1994 | -10°C 1998 | 69% |
| Dec 3 | 1°C | -5°C | 9°C 2015 | -11°C 2001 | 69% |
| Dec 4 | 1°C | -5°C | 10°C 2018 | -10°C 1998 | 70% |
| Dec 5 | 0°C | -6°C | 10°C 2008 | -11°C 2017 | 70% |
| Dec 6 | 0°C | -6°C | 9°C 1991 | -13°C 1998 | 70% |
| Dec 7 | 0°C | -6°C | 7°C 1992 | -15°C 1998 | 69% |
| Dec 8 | 0°C | -7°C | 10°C 1992 | -13°C 2011 | 70% |
| Dec 9 | -1°C | -7°C | 8°C 2008 | -13°C 2011 | 71% |
| Dec 10 | -1°C | -7°C | 9°C 1992 | -12°C 2002 | 73% |
| Dec 11 | -1°C | -7°C | 8°C 1992 | -12°C 2002 | 73% |
| Dec 12 | -1°C | -8°C | 5°C 2019 | -13°C 2016 | 74% |
| Dec 13 | -1°C | -8°C | 3°C 2015 | -15°C 2005 | 73% |
| Dec 14 | -1°C | -8°C | 4°C 2015 | -13°C 2014 | 72% |
| Dec 15 | -2°C | -8°C | 6°C 2015 | -15°C 1994 | 70% |
| Dec 16 | -2°C | -8°C | 4°C 2015 | -16°C 1994 | 70% |
| Dec 17 | -2°C | -8°C | 6°C 1991 | -14°C 2011 | 71% |
| Dec 18 | -2°C | -9°C | 6°C 2008 | -13°C 2005 | 71% |
| Dec 19 | -2°C | -9°C | 4°C 1997 | -13°C 2020 | 70% |
| Dec 20 | -2°C | -9°C | 5°C 1997 | -16°C 1993 | 71% |
| Dec 21 | -2°C | -9°C | 3°C 1993 | -13°C 2017 | 71% |
| Dec 22 | -2°C | -9°C | 2°C 1992 | -15°C 2001 | 71% |
| Dec 23 | -2°C | -9°C | 2°C 1991 | -16°C 2001 | 72% |
| Dec 24 | -2°C | -9°C | 4°C 2015 | -15°C 2016 | 73% |
| Dec 25 | -2°C | -9°C | 4°C 2017 | -14°C 2010 | 73% |
| Dec 26 | -2°C | -10°C | 3°C 1993 | -16°C 2009 | 72% |
| Dec 27 | -2°C | -10°C | 3°C 1997 | -14°C 2012 | 72% |
| Dec 28 | -2°C | -10°C | 2°C 1999 | -19°C 2016 | 73% |
| Dec 29 | -3°C | -10°C | 2°C 2003 | -16°C 2005 | 74% |
| Dec 30 | -3°C | -10°C | 3°C 2019 | -18°C 2020 | 76% |
| Dec 31 | -3°C | -10°C | 4°C 2019 | -20°C 2020 | 75% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT+9).
- December 1
- sunrise 6:45 AM, sunset 3:59 PM
- December 31
- sunrise 7:05 AM, sunset 4:07 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 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.