The week began under a strong ridge of high pressure with pleasantly cool temperatures, low humidity and a light northerly breeze. On Monday, numerous sites reported morning temperatures in the low 60's. High temperatures reached the upper 80's for most of the state. The Carolina Sandhill in Chesterfield County recorded an afternoon high temperature of 91 degrees.
After Monday's pleasant weather, the sub-tropical high strengthened over the southeast U.S., increasing temperatures and humidity for the last week of Spring 2017. Santuck observed a Tuesday high temperature of 93 degrees, as many other sites reported temperatures at, or above 90 degrees. Tuesday's diurnal heating triggered numerous Upstate afternoon thunderstorms. Caesars Head received 1.12 inches of rain. Quarter-sized hail was observed in Lyman.
Wednesday and Thursday saw widespread heat and increased humidity and afternoon storms. The Marion County airport measured 1.61 inches of afternoon rain on Wednesday. Both of Columbia's airports reported 96 degrees on Thursday. Strong thunderstorms on Thursday dropped heavy rain across the state with many sites reporting one to two inches. The rain gage at the McEntire Air National Guard Base collected 3.77 inches late Thursday night in 6 hours. A CoCoRaHS observer in Cayce reported 4.41 inches of rain, and: "Brief high wind but 5 hours of electrical storm."
With the sub-tropical high locked over the state, temperatures in the 90s and widely scattered afternoon thunderstorms persisted Friday through Sunday. The CoCoRaHS observer at Swansea 5.8 ENE reported 3.75 inches of rain on Saturday in their Sunday morning report.
(Note: The highest and lowest official temperatures and highest precipitation totals provided below are based on observations from the National Weather Service Cooperative Observer network and the National Weather Service's Forecast Offices.)
The highest official temperature reported was 97 degrees at the Columbia Metro Airport 0n June 14.
The lowest official temperature reported was 53 degrees at Caesars Head on June 12.
The heaviest official 24-hour rainfall reported was 3.56 inches at Columbia USC ending on June 14.
The state average rainfall for the seven-day period was 0.8 inches.
| Weekly | Jan 1 | Departure | |
|---|---|---|---|
| Anderson AP | 0.50 | 24.07 | -3.5 |
| Greer AP | 0.58 | 26.79 | 5.2 |
| Charlotte, NC AP | 0.22 | 23.12 | 3.8 |
| Columbia Metro AP | 3.32 | 27.86 | 8.6 |
| Orangeburg AP | 0.98 | 18.53 | -2.1 |
| Augusta, GA Bush AP | 1.17 | 21.60 | 1.2 |
| Florence AP | 0.88 | 16.56 | -1.6 |
| N Myrtle Beach AP | 0.04 | 14.71 | -5.4 |
| Charleston AP | 0.63 | 18.49 | -1.0 |
| Savannah, GA AP | 0.00 | 24.97 | 5.2 |
Weekly rainfall totals ending midnight Sunday.
4-inch depth soil temperature: Clinton 73 degrees. Columbia 78 degrees. Barnwell 74 degrees. Mullins 77 degrees.
South Carolina river stages were normal. Charleston Harbor Custom House reported a water temperature of 83 degrees. The Fripp Nearshore Buoy Station 41033 reported a water temperature of 82 degrees.
