Port Royal, SC climate
Port Royal has warm winters and warm summers, with plenty of rain. A typical July afternoon reaches 91°, a January night drops to 41°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Port Royal feels like
Winter
Spring
Summer
Fall
Port Royal weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 60° | 41° | 3.4" | 0 | 9 | 0 | 45° – 57° |
| February | 63° | 43° | 3.2" | 0 | 9 | 0 | 46° – 63° |
| March | 69° | 49° | 3.4" | 0 | 9 | 0 | 53° – 66° |
| April | 76° | 56° | 3.2" | 0 | 9 | 0 | 61° – 71° |
| May | 83° | 65° | 3.2" | 0 | 8 | 0 | 70° – 79° |
| June | 88° | 72° | 5.3" | 0 | 13 | 0 | 75° – 84° |
| July | 91° | 75° | 5.8" | 0 | 13 | 0 | 80° – 86° |
| August | 89° | 74° | 6.6" | 0 | 13 | 0 | 79° – 84° |
| September | 85° | 70° | 4.7" | 0 | 10 | 0 | 75° – 82° |
| October | 78° | 60° | 4.2" | 0 | 8 | 0 | 65° – 74° |
| November | 69° | 50° | 2.6" | 0 | 8 | 0 | 55° – 65° |
| December | 62° | 43° | 3.1" | 0 | 10 | 0 | 44° – 64° |
| Year | 76° | 58° | 48.5" | 0.0" | 118 | 0 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Port Royal
Port Royal gets 49 inches of rain and melted snow a year. August is the wettest month and November the driest. Rain or snow falls on about 118 days a year.
About 282 frost-free days a year
In half of years the last 32° night comes by March 3 and the first one by December 9. That leaves about 282 frost-free days for gardens, longer than 94% of U.S. towns.
Heating and cooling a home in Port Royal
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Port Royal, 38% of that work is heating and 62% is cooling, so air conditioning is the bigger bill.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
Port Royal and its neighbors
Port Royal borders 3 towns with climate data. January nights across them vary by 0.4°. Shell Point has the coldest January nights (40°) and Burton the hottest July afternoons (91°). Port Royal’s January low is 41° and its July high 91°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Port Royal compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Port Royal averaged 1.0° warmer than the 1900s. The biggest change is in December (+1.8°). The shift is smaller than in 73% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Port Royal’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. December swings the most: between 1991 and 2020 its average temperature ranged from 44° to 64°. August is the most reliable, staying within 5°.
Common questions about Port Royal’s climate
What is the coldest month in Port Royal?
January, with a typical high of 60° and a low of 41°.
What is the hottest month in Port Royal?
July, with a typical high of 91° and a low of 75°. About 58 days a year reach 90°.
How much snow does Port Royal get?
Almost none. A normal year brings 0.0 inches.
When is the first frost in Port Royal?
In half of years the first 32° night comes by December 9, and the last spring frost by March 3.
What is the rainiest month in Port Royal?
August, with 6.6 inches of rain and melted snow. The year totals 49 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Port Royal itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Beaufort Mcas, SC (9 mi, snow) and Beaufort WWTP, SC (3 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.