Viana Weather in December

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

Average highs run from 36°C on December 1 to 33°C on December 31, and lows from 25°C to 24°C. Normal precipitation for the month is 81 mm over about 12 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: 35°C
Average low: 25°C
Precipitation: 81 mm
Reanalysis high: 40°CDec 1, 2015
Reanalysis low: 22°CDec 27, 2018
Daylight: 12 h 18 min to 12 h 18 min
Cloud cover: 58%
Humidity: 68%
Dew point: 22°C
Wind: 7.2 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	36°C	25°C	40°C 2015	24°C 2018	27%
Dec 2	36°C	25°C	39°C 2015	23°C 2018	28%
Dec 3	36°C	25°C	38°C 1997	24°C 2001	29%
Dec 4	36°C	25°C	38°C 2003	23°C 2001	30%
Dec 5	36°C	25°C	38°C 2017	23°C 1996	31%
Dec 6	36°C	25°C	39°C 1997	23°C 1995	32%
Dec 7	35°C	25°C	38°C 1997	23°C 1995	33%
Dec 8	35°C	25°C	38°C 2000	23°C 2018	34%
Dec 9	35°C	25°C	38°C 2015	23°C 2018	35%
Dec 10	35°C	25°C	38°C 2017	23°C 1992	36%
Dec 11	35°C	25°C	37°C 1991	24°C 1995	36%
Dec 12	35°C	25°C	38°C 1991	24°C 2018	38%
Dec 13	35°C	25°C	38°C 2015	24°C 1994	39%
Dec 14	35°C	25°C	37°C 2012	23°C 2010	40%
Dec 15	35°C	25°C	38°C 2012	23°C 1994	41%
Dec 16	35°C	25°C	37°C 2002	23°C 2000	42%
Dec 17	35°C	25°C	37°C 2005	22°C 2016	42%
Dec 18	34°C	25°C	37°C 2005	23°C 2000	44%
Dec 19	34°C	25°C	37°C 2012	23°C 2010	45%
Dec 20	34°C	25°C	37°C 1996	22°C 2016	44%
Dec 21	34°C	25°C	38°C 2014	22°C 2000	45%
Dec 22	34°C	25°C	37°C 2019	23°C 1999	46%
Dec 23	34°C	25°C	37°C 1991	22°C 1998	48%
Dec 24	34°C	25°C	38°C 2019	23°C 1999	49%
Dec 25	34°C	25°C	37°C 2013	23°C 2018	51%
Dec 26	34°C	24°C	38°C 2019	23°C 1993	52%
Dec 27	34°C	24°C	38°C 2015	22°C 2018	53%
Dec 28	34°C	24°C	36°C 2014	23°C 2018	55%
Dec 29	33°C	24°C	37°C 2011	23°C 1994	56%
Dec 30	33°C	24°C	37°C 2015	22°C 1999	58%
Dec 31	33°C	24°C	37°C 2013	23°C 1999	60%

Chance of rain

Chance of a wet day

Sunrise and sunset

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

December 1: sunrise 5:40 AM, sunset 5:58 PM
December 31: sunrise 5:54 AM, sunset 6:12 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.