Isumi Weather in December
Average highs run from 18°C on December 1 to 14°C on December 31, and lows from 15°C to 11°C. Normal precipitation for the month is 84 mm over about 9 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
- 16°C
- Average low
- 13°C
- Precipitation
- 84 mm
- Reanalysis high
- 24°CDec 5, 2004
- Reanalysis low
- 5°CDec 26, 1995
- Daylight
- 9 h 58 min to 9 h 49 min
- Cloud cover
- 62%
- Humidity
- 71%
- Dew point
- 9°C
- Wind
- 28.8 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 | 18°C | 15°C | 22°C 2014 | 9°C 1996 | 36% |
| Dec 2 | 18°C | 15°C | 22°C 2019 | 9°C 1996 | 35% |
| Dec 3 | 18°C | 15°C | 22°C 2015 | 10°C 1997 | 35% |
| Dec 4 | 17°C | 14°C | 23°C 2018 | 10°C 1997 | 36% |
| Dec 5 | 17°C | 14°C | 24°C 2004 | 11°C 2005 | 36% |
| Dec 6 | 17°C | 14°C | 22°C 2003 | 10°C 2014 | 35% |
| Dec 7 | 17°C | 14°C | 21°C 1997 | 9°C 2000 | 34% |
| Dec 8 | 17°C | 14°C | 20°C 1997 | 9°C 2010 | 33% |
| Dec 9 | 17°C | 14°C | 20°C 1994 | 8°C 1995 | 32% |
| Dec 10 | 16°C | 13°C | 20°C 2015 | 10°C 2012 | 32% |
| Dec 11 | 16°C | 13°C | 23°C 2015 | 10°C 2002 | 31% |
| Dec 12 | 16°C | 13°C | 20°C 2003 | 9°C 2000 | 30% |
| Dec 13 | 16°C | 13°C | 20°C 2001 | 7°C 2005 | 29% |
| Dec 14 | 16°C | 13°C | 20°C 2010 | 9°C 2002 | 29% |
| Dec 15 | 16°C | 13°C | 19°C 2015 | 9°C 2005 | 29% |
| Dec 16 | 16°C | 13°C | 20°C 2004 | 7°C 1994 | 28% |
| Dec 17 | 16°C | 13°C | 20°C 2002 | 7°C 2014 | 27% |
| Dec 18 | 15°C | 12°C | 20°C 2019 | 6°C 2005 | 26% |
| Dec 19 | 15°C | 12°C | 20°C 2000 | 8°C 2005 | 24% |
| Dec 20 | 15°C | 12°C | 19°C 2008 | 8°C 2003 | 24% |
| Dec 21 | 15°C | 12°C | 21°C 2008 | 9°C 2009 | 24% |
| Dec 22 | 15°C | 12°C | 21°C 2008 | 7°C 2005 | 24% |
| Dec 23 | 15°C | 12°C | 22°C 2016 | 7°C 1993 | 24% |
| Dec 24 | 15°C | 12°C | 19°C 1991 | 7°C 1992 | 25% |
| Dec 25 | 15°C | 11°C | 19°C 2017 | 5°C 1995 | 24% |
| Dec 26 | 15°C | 11°C | 19°C 2006 | 5°C 1995 | 23% |
| Dec 27 | 15°C | 11°C | 21°C 2006 | 6°C 2012 | 22% |
| Dec 28 | 14°C | 11°C | 18°C 1992 | 7°C 2005 | 22% |
| Dec 29 | 14°C | 11°C | 19°C 2020 | 7°C 1991 | 22% |
| Dec 30 | 14°C | 11°C | 20°C 2020 | 7°C 2020 | 21% |
| Dec 31 | 14°C | 11°C | 20°C 2019 | 7°C 2020 | 21% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT+9).
- December 1
- sunrise 6:28 AM, sunset 4:26 PM
- December 31
- sunrise 6:47 AM, sunset 4:36 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.