Barreiras Weather in December

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

Average highs run from 31°C on December 1 to 30°C on December 31, and lows from 21°C to 21°C. Normal precipitation for the month is 171 mm over about 19 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: 31°C
Average low: 21°C
Precipitation: 171 mm
Reanalysis high: 40°CDec 3, 2002
Reanalysis low: 17°CDec 7, 2011
Daylight: 12 h 48 min to 12 h 50 min
Cloud cover: 68%
Humidity: 71%
Dew point: 19°C
Wind: 9.4 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	31°C	21°C	38°C 2002	17°C 1995	62%
Dec 2	31°C	21°C	39°C 2002	17°C 1995	63%
Dec 3	31°C	21°C	40°C 2002	18°C 1996	63%
Dec 4	31°C	21°C	39°C 2002	18°C 1996	62%
Dec 5	31°C	21°C	39°C 2002	18°C 2004	63%
Dec 6	31°C	21°C	40°C 2002	17°C 1992	63%
Dec 7	31°C	21°C	37°C 2020	17°C 2011	63%
Dec 8	31°C	21°C	37°C 2020	18°C 2011	63%
Dec 9	31°C	21°C	35°C 2015	18°C 1999	63%
Dec 10	31°C	21°C	36°C 2003	18°C 1999	63%
Dec 11	31°C	21°C	37°C 2015	18°C 1994	64%
Dec 12	30°C	21°C	38°C 2015	18°C 1998	64%
Dec 13	31°C	21°C	38°C 2003	18°C 2018	62%
Dec 14	31°C	21°C	38°C 2019	18°C 2018	62%
Dec 15	31°C	21°C	38°C 2020	18°C 2018	62%
Dec 16	31°C	21°C	38°C 2015	19°C 1992	59%
Dec 17	31°C	21°C	38°C 2019	18°C 2010	57%
Dec 18	31°C	21°C	39°C 2019	18°C 1995	56%
Dec 19	31°C	21°C	38°C 2015	18°C 1995	56%
Dec 20	31°C	21°C	39°C 2019	18°C 2012	55%
Dec 21	31°C	21°C	38°C 2019	18°C 2017	55%
Dec 22	31°C	21°C	39°C 2019	19°C 1991	55%
Dec 23	31°C	21°C	39°C 2019	18°C 2005	55%
Dec 24	31°C	21°C	39°C 2019	18°C 1991	55%
Dec 25	31°C	21°C	38°C 2015	18°C 1991	55%
Dec 26	31°C	21°C	36°C 2012	17°C 2000	56%
Dec 27	31°C	21°C	37°C 2015	17°C 2000	56%
Dec 28	31°C	21°C	37°C 2015	18°C 2007	56%
Dec 29	31°C	21°C	37°C 2015	18°C 1992	58%
Dec 30	31°C	21°C	35°C 2012	18°C 1992	58%
Dec 31	30°C	21°C	36°C 2012	17°C 1992	59%

Chance of rain

Chance of a wet day

Sunrise and sunset

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

December 1: sunrise 5:25 AM, sunset 6:13 PM
December 31: sunrise 5:38 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.