Santa Isabel do Rio Negro Weather in December

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

Average highs run from 29°C on December 1 to 29°C on December 31, and lows from 24°C to 24°C. Normal precipitation for the month is 192 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: 29°C
Average low: 24°C
Precipitation: 192 mm
Reanalysis high: 35°CDec 5, 2017
Reanalysis low: 21°CDec 25, 1998
Daylight: 12 h 09 min to 12 h 09 min
Cloud cover: 75%
Humidity: 91%
Dew point: 24°C
Wind: 2.9 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	29°C	24°C	34°C 2016	22°C 2004	75%
Dec 2	29°C	24°C	33°C 2017	22°C 2012	75%
Dec 3	29°C	24°C	32°C 2017	22°C 1999	75%
Dec 4	29°C	24°C	34°C 2017	22°C 1999	75%
Dec 5	29°C	24°C	35°C 2017	23°C 1993	76%
Dec 6	29°C	24°C	33°C 2017	22°C 1996	76%
Dec 7	29°C	24°C	30°C 2016	22°C 2008	77%
Dec 8	29°C	24°C	31°C 1997	23°C 1996	78%
Dec 9	29°C	24°C	30°C 2015	23°C 2007	79%
Dec 10	29°C	24°C	31°C 2016	23°C 1992	81%
Dec 11	29°C	24°C	31°C 2015	22°C 1996	82%
Dec 12	29°C	24°C	31°C 1997	23°C 2014	82%
Dec 13	29°C	24°C	33°C 2017	22°C 1996	83%
Dec 14	29°C	24°C	32°C 2017	22°C 2003	82%
Dec 15	29°C	24°C	33°C 2017	22°C 2004	84%
Dec 16	29°C	24°C	33°C 1997	22°C 2006	86%
Dec 17	29°C	24°C	32°C 2017	23°C 1996	86%
Dec 18	29°C	24°C	32°C 2017	22°C 2000	86%
Dec 19	29°C	24°C	31°C 2016	22°C 1998	85%
Dec 20	29°C	24°C	32°C 1997	22°C 2000	86%
Dec 21	29°C	24°C	32°C 1997	22°C 1992	85%
Dec 22	29°C	24°C	30°C 2004	22°C 1991	85%
Dec 23	29°C	24°C	31°C 2016	22°C 2005	85%
Dec 24	29°C	24°C	31°C 2016	21°C 1998	84%
Dec 25	29°C	24°C	31°C 2017	21°C 1998	83%
Dec 26	29°C	24°C	31°C 2017	23°C 1998	82%
Dec 27	29°C	24°C	31°C 2016	22°C 2004	81%
Dec 28	29°C	24°C	31°C 2016	22°C 2004	80%
Dec 29	29°C	24°C	30°C 2015	22°C 1999	80%
Dec 30	29°C	24°C	31°C 1997	22°C 2020	80%
Dec 31	29°C	24°C	31°C 2017	22°C 2018	80%

Chance of rain

Chance of a wet day

Sunrise and sunset

Times for 2026, local time (GMT-4).

December 1: sunrise 6:05 AM, sunset 6:14 PM
December 31: sunrise 6:19 AM, sunset 6:28 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 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.