Mount Pleasant climate

Mount Pleasant Weather in December

NOAA 1991-2020 normals for Sullivans Is, 3.6 km from Mount Pleasant

Average highs run from 65°F on December 1 to 60°F on December 31, and lows from 43°F to 37°F. Normal precipitation for the month is 3.62 in.

December day by day

The normal high and low for each date, and the record, in °F.

Normal daily high and low temperature at Mount Pleasant, in °F, with the record for each date.020406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

December at a glance

Average high
62°F
Average low
40°F
Precipitation
3.62 in
Record high
84°FDec 10, 1987
Record low
11°FDec 20, 2000
Chance of a freeze
91%
Daylight
10 h 09 min to 10 h 01 min
Cloud cover
56%
Humidity
82%
Dew point
45°F
Wind
6.9 mph

Every day of the month

A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.

DateNormal highNormal lowRecord highRecord lowChance wetChance of snow
Dec 165°F43°F83°F 200927°F 19640%
Dec 265°F43°F80°F 199827°F 20200%
Dec 364°F43°F76°F 197026°F 20080%
Dec 464°F42°F78°F 197026°F 19660%
Dec 564°F42°F79°F 199825°F 19700%
Dec 664°F42°F75°F 197828°F 19690%
Dec 764°F42°F79°F 200126°F 19540%
Dec 863°F41°F80°F 199820°F 19840%
Dec 963°F41°F78°F 199825°F 20060%
Dec 1063°F41°F84°F 198729°F 19770%
Dec 1163°F41°F78°F 200723°F 19770%
Dec 1263°F41°F76°F 200720°F 19570%
Dec 1362°F40°F77°F 197112°F 19620%
Dec 1462°F40°F79°F 200123°F 20050%
Dec 1562°F40°F76°F 197123°F 19880%
Dec 1662°F40°F78°F 197123°F 20100%
Dec 1762°F40°F75°F 197120°F 20070%
Dec 1862°F39°F78°F 197112°F 20000%
Dec 1962°F39°F78°F 197119°F 19750%
Dec 2061°F39°F79°F 200811°F 20000%
Dec 2161°F39°F74°F 198824°F 19810%
Dec 2261°F39°F75°F 201314°F 20000%
Dec 2361°F38°F80°F 199817°F 19890%
Dec 2461°F38°F78°F 201519°F 20220%
Dec 2561°F38°F74°F 197825°F 19670%
Dec 2661°F38°F77°F 201513°F 19830%
Dec 2760°F38°F78°F 201519°F 20000%
Dec 2860°F38°F79°F 201518°F 20000%
Dec 2960°F37°F78°F 197115°F 20000%
Dec 3060°F37°F75°F 197114°F 20000%
Dec 3160°F37°F78°F 199023°F 19830%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Mount Pleasant, in percent, and of at least 0.1 inch of snowfall.00.10.10.20.21102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (EST).

December 1
sunrise 7:04 AM, sunset 5:13 PM
December 31
sunrise 7:22 AM, sunset 5:23 PM

Every day of December: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00388405 (Sullivans Is), public domain. Records: NOAA GHCN-Daily, station USC00388405, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: 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.