Castanhal Weather in December

NASA POWER reanalysis for the half-degree grid cell around Castanhal, 1991-2020; a grid cell is an area average and can differ from a thermometer in town by several degrees

Average highs run from 34°C on December 1 to 31°C on December 31, and lows from 24°C to 24°C. Normal precipitation for the month is 158 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: 33°C
Average low: 24°C
Precipitation: 158 mm
Reanalysis high: 38°CDec 1, 2015
Reanalysis low: 21°CDec 19, 2016
Daylight: 12 h 12 min to 12 h 12 min
Cloud cover: 68%
Humidity: 76%
Dew point: 23°C
Wind: 4.7 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	34°C	24°C	38°C 2015	22°C 1994	54%
Dec 2	34°C	24°C	37°C 2015	22°C 2006	54%
Dec 3	34°C	24°C	37°C 2017	23°C 1996	55%
Dec 4	34°C	24°C	38°C 2017	22°C 2011	56%
Dec 5	34°C	24°C	38°C 2017	22°C 2011	58%
Dec 6	34°C	24°C	37°C 1991	23°C 1994	60%
Dec 7	34°C	24°C	37°C 1991	23°C 1993	62%
Dec 8	34°C	24°C	37°C 2012	22°C 1994	63%
Dec 9	34°C	24°C	37°C 1991	22°C 1996	66%
Dec 10	34°C	24°C	37°C 1991	23°C 2007	67%
Dec 11	34°C	24°C	37°C 1991	23°C 2020	69%
Dec 12	33°C	24°C	38°C 1991	23°C 1994	70%
Dec 13	33°C	24°C	37°C 1991	23°C 2005	72%
Dec 14	33°C	24°C	37°C 1991	23°C 1996	75%
Dec 15	33°C	24°C	37°C 1991	23°C 1994	76%
Dec 16	33°C	24°C	37°C 1991	23°C 2017	78%
Dec 17	33°C	24°C	36°C 1991	22°C 2000	79%
Dec 18	33°C	24°C	36°C 1992	22°C 2000	80%
Dec 19	32°C	24°C	36°C 1991	21°C 2016	82%
Dec 20	32°C	24°C	36°C 1991	22°C 2017	82%
Dec 21	32°C	24°C	34°C 2001	22°C 2000	84%
Dec 22	32°C	24°C	36°C 2014	22°C 2020	85%
Dec 23	32°C	24°C	35°C 1991	22°C 1998	86%
Dec 24	32°C	24°C	35°C 2001	23°C 1999	86%
Dec 25	32°C	24°C	36°C 2001	23°C 1999	87%
Dec 26	32°C	24°C	36°C 2014	22°C 2000	88%
Dec 27	32°C	24°C	36°C 2014	22°C 2000	88%
Dec 28	31°C	24°C	36°C 2014	23°C 1994	88%
Dec 29	31°C	24°C	36°C 2015	22°C 2005	88%
Dec 30	31°C	24°C	36°C 2015	22°C 2002	89%
Dec 31	31°C	24°C	36°C 1991	23°C 1991	90%

Chance of rain

Chance of a wet day

Sunrise and sunset

Times for 2026, local time (GMT-3).

December 1: sunrise 5:55 AM, sunset 6:07 PM
December 31: sunrise 6:09 AM, sunset 6:21 PM

Every day of December: sun and moon

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.