Pre-frontal showers on Monday fell through December's mild air. Rainfall measurements taken on Tuesday morning included 0.45 inches at Sullivan's Island, 0.37 inches at Winnsboro and 0.19 inches for Aiken and Edgefield. Deep, blue skies on Tuesday afternoon were the result of a temperate, Pacific-origin air mass. At 2:00 p.m., all reporting sites in South Carolina were in the 70's. Chester and Charleston both warmed up to 76 degrees. On Wednesday at 3:00 p.m., the Columbia Metro AP reported sunny skies, calm air and 74 degrees. Lake City and Holly Hill reached 76 degrees. Rains entered the state late Wednesday becoming heavy before sunrise on Thursday. On Thursday morning, Spartanburg had received 2.50 inches. Fountain Inn received 1.85 inches and both West Pelzer and Anderson reported 1.50 inches. The 8:00 a.m. surface weather observation at Spartanburg, Aiken and Winnsboro noted heavy rain. Another mild afternoon at Myrtle Beach and Jamestown moved the temperature to 79 degrees, a full 20 degrees over the date's high temperature average. Rainfall amounts taken on Friday morning topped an inch at Clinton (1.34), Longtown (1.30) and Manning (1.18). Colder and clearing west winds on Friday gusted to 34 mph at the Greenville-Spartanburg AP, Columbia Metro AP and Charleston AP. The Charleston AP yearly rainfall record of 72.99 inches, set in 1964, was broken on December 18 when the calendar-day amount of 0.43 brought the 2015 total to 73.40 inches. On Saturday morning, Edisto Beach recorded 31 degrees and their coldest morning in ten months. Sandhill and Johnston recorded a hard freeze and frost of 25 degrees. At 2:00 p.m., Columbia's Hamilton-Owens AP noted 52 degrees with 21 percent relative humidity. The afternoon high temperature at Rock Hill, Kingstree and Moncks Corner just made it to 50 degrees. Sunday morning's low temperatures fell to 23 degrees at Pickens and Whitmire, 24 degrees at Cedar Creek, 28 degrees in Marion and 30 degrees at Summerville AP. A peak barometric pressure value of 30.64 inches (9:55 a.m.) of mercury was recorded at the Darlington Jetport (KUDG). Mostly sunny conditions gave way to increasing clouds during the afternoon hours. Ten degrees separated Greenville's Sunday afternoon high temperature of 53 with Beaufort's 63 degrees.
The highest official temperature reported was 82 degrees at Cheraw 2 on December 15. The lowest official temperature reported was 19 degrees (state's lowest of season) at the Walhalla Fish Hatchery on December 19. The heaviest official 24-hour rainfall reported was 2.75 inches at Calhoun Falls ending at 7:00 a.m. on December 17. The state average rainfall for the seven-day period was 1.1 inches. The state average temperature for the seven-day period was ten degrees above the long term average.
| Weekly | Jan 1 | Departure | |
|---|---|---|---|
| Anderson AP | 1.82 | 44.84 | 2.1 |
| Greer AP | 2.29 | 52.45 | 6.6 |
| Charlotte, NC AP | 1.34 | 42.26 | 1.8 |
| Columbia Metro AP | 0.49 | 57.95 | 14.5 |
| Orangeburg AP | 0.53 | 52.31 | 6.7 |
| Augusta, GA Bush AP | 1.22 | 42.19 | -0.1 |
| Florence AP | 0.82 | 51.40 | 9.6 |
| N Myrtle Beach AP | 0.24 | 62.91 | 12.0 |
| Charleston AP | 0.88 | 73.40 | 23.6 |
| Savannah, GA AP | 1.03 | 46.01 | -0.8 |
Weekly rainfall totals ending midnight Sunday.
4-inch depth soil temperature: Columbia 55 degrees, Charleston 55 degrees.
South Carolina river stages were near normal. The Charleston Harbor Ravenel Bridge reported a water temperature of 61 degrees. Springmaid Pier at Myrtle Beach reported a surf water temperature of 61 degrees.
