Castro Weather in December
Average highs run from 15°C on December 1 to 17°C on December 31, and lows from 8°C to 9°C. Normal precipitation for the month is 93 mm over about 16 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
- 9°C
- Precipitation
- 93 mm
- Reanalysis high
- 27°CDec 1, 2008
- Reanalysis low
- 4°CDec 11, 2010
- Daylight
- 15 h 03 min to 15 h 14 min
- Cloud cover
- 69%
- Humidity
- 83%
- Dew point
- 9°C
- Wind
- 11.2 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 | 15°C | 8°C | 27°C 2008 | 5°C 2009 | 46% |
| Dec 2 | 15°C | 8°C | 24°C 2008 | 4°C 2009 | 44% |
| Dec 3 | 15°C | 8°C | 22°C 2017 | 5°C 2020 | 45% |
| Dec 4 | 15°C | 8°C | 21°C 2008 | 5°C 1993 | 45% |
| Dec 5 | 16°C | 8°C | 26°C 2008 | 5°C 2005 | 43% |
| Dec 6 | 16°C | 8°C | 25°C 2008 | 5°C 2005 | 43% |
| Dec 7 | 16°C | 8°C | 27°C 2018 | 6°C 2001 | 43% |
| Dec 8 | 16°C | 8°C | 22°C 2004 | 6°C 1991 | 43% |
| Dec 9 | 16°C | 8°C | 19°C 2004 | 6°C 1991 | 42% |
| Dec 10 | 16°C | 9°C | 23°C 2008 | 5°C 2010 | 43% |
| Dec 11 | 16°C | 9°C | 26°C 1996 | 4°C 2010 | 43% |
| Dec 12 | 16°C | 9°C | 24°C 1996 | 6°C 2010 | 43% |
| Dec 13 | 16°C | 9°C | 23°C 2008 | 6°C 2015 | 43% |
| Dec 14 | 16°C | 9°C | 22°C 2014 | 6°C 2015 | 44% |
| Dec 15 | 16°C | 9°C | 22°C 2011 | 5°C 2020 | 45% |
| Dec 16 | 16°C | 9°C | 21°C 1997 | 6°C 1996 | 47% |
| Dec 17 | 16°C | 9°C | 22°C 2001 | 5°C 2010 | 47% |
| Dec 18 | 16°C | 9°C | 21°C 1995 | 5°C 2010 | 47% |
| Dec 19 | 16°C | 9°C | 22°C 1995 | 7°C 2014 | 48% |
| Dec 20 | 16°C | 9°C | 20°C 1995 | 6°C 2014 | 49% |
| Dec 21 | 16°C | 9°C | 19°C 1995 | 5°C 2014 | 49% |
| Dec 22 | 16°C | 9°C | 20°C 1995 | 6°C 2011 | 50% |
| Dec 23 | 16°C | 9°C | 21°C 2001 | 5°C 2011 | 50% |
| Dec 24 | 16°C | 9°C | 23°C 2007 | 6°C 1991 | 50% |
| Dec 25 | 16°C | 9°C | 23°C 1995 | 6°C 1991 | 50% |
| Dec 26 | 16°C | 9°C | 22°C 1995 | 6°C 1996 | 50% |
| Dec 27 | 16°C | 9°C | 23°C 1995 | 6°C 2001 | 50% |
| Dec 28 | 16°C | 9°C | 20°C 2016 | 7°C 1992 | 51% |
| Dec 29 | 16°C | 9°C | 21°C 2016 | 6°C 1992 | 49% |
| Dec 30 | 16°C | 9°C | 21°C 2010 | 7°C 2009 | 48% |
| Dec 31 | 17°C | 9°C | 21°C 2011 | 6°C 1996 | 48% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT-3).
- December 1
- sunrise 6:13 AM, sunset 9:16 PM
- December 31
- sunrise 6:21 AM, sunset 9:35 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.