Summerville, SC frost dates
From NOAA weather station Summerville 4W (USC00388426), elevation 65 ft. The station is named for Summerville, and its coordinates are 3.7 miles from the Census Bureau’s internal point for Summerville town.
Summary
In the 1991–2020 record, the median last spring freeze (32°F) at Summerville 4W is Mar 22 and the median first fall freeze is Nov 12, for a typical freeze-free season of 238 days. In about 1 year in 10 the last spring freeze comes after Apr 7, and in about 1 year in 10 the first fall freeze arrives by Oct 29. The station averages 45 nights per year with a low of 32°F or colder.
Compared with the median of 103 South Carolina stations in this dataset, the median last freeze here is 4 days earlier than the state median (Mar 26), the median first freeze is 3 days later than the state median (Nov 9), and the growing season ranks #36 of 103 by length (longest = #1). The spread between the 90% and 10% spring dates is 37 days, a measure of how variable spring is here.
Freeze probability table
| Threshold | Last spring occurrence | First fall occurrence | Season length (days) 90% / 50% / 10% | ||||
|---|---|---|---|---|---|---|---|
| Early (90% chance of a later freeze) | Median (50%) | Cautious (10% chance of a later freeze) | Early (10% chance by then) | Median (50%) | Late (90% chance by then) | ||
| 36°F (light frost possible) | Mar 16 | Apr 3 | Apr 19 | Oct 19 | Nov 3 | Nov 18 | 192 / 213 / 238 |
| 32°F (freeze) | Mar 1 | Mar 22 | Apr 7 | Oct 29 | Nov 12 | Dec 3 | 213 / 238 / 266 |
| 28°F (hard freeze) | Feb 10 | Mar 7 | Mar 28 | Nov 7 | Nov 29 | Dec 28 | 235 / 265 / 301 |
Read the spring “Cautious” column as the safer planting date: only about 1 year in 10 has a freeze after it. NOAA computes these from daily minimum temperatures at the station; your yard can differ, especially in low spots or at a different elevation.
Planting calendar for Summerville
Pick how much frost risk you accept. The calendar applies generic, extension-published timing rules to this station’s dates. See the rules and sources.
| Crop | Start seeds indoors | Plant outdoors (spring) | Latest fall planting (est.) | Days to harvest |
|---|
Fall estimates count back from the median first fall freeze (32°F for tender crops, 28°F hard freeze for cool-season crops) by the longer days-to-harvest figure. These are rough planning aids, not recommendations for any specific variety; check seed packets and your county extension office.
Towns that use this station as their nearest
Census places within 15 miles whose closest station in this dataset is Summerville 4W: Summerville (4 mi), Lincolnville (5 mi), Ridgeville (6 mi), Sangaree (6 mi), Ladson (8 mi).
Nearby stations
- Charleston Intl AP, SC — 15 mi; median last freeze Mar 7, first freeze Nov 27
- Moncks Corner 4 N, SC — 20 mi; median last freeze Mar 10, first freeze Nov 26
- Holly Hill 1 SW, SC — 22 mi; median last freeze Mar 22, first freeze Nov 12
- Charleston City, SC — 25 mi; median last freeze Feb 4, first freeze Dec 30
- Walterboro 1 SW, SC — 28 mi; median last freeze Mar 19, first freeze Nov 12
About this station’s data
- Station ID: USC00388426 · Latitude 33.0367, longitude -80.2325 · Elevation 20 m (65 ft)
- NOAA completeness flag: R — Representative: meets WMO standards for 10 or more years; gaps filled from surrounding stations. Years of data used: 22.
- Source file: USC00388426.csv (NOAA NCEI 1991–2020 annual/seasonal normals).
Raw values from the NOAA file (32°F)
| Field | Value |
|---|---|
ANN-TMIN-PRBLST-T32FP10 | 04/07 |
ANN-TMIN-PRBLST-T32FP50 | 03/22 |
ANN-TMIN-PRBLST-T32FP90 | 03/01 |
ANN-TMIN-PRBFST-T32FP10 | 10/29 |
ANN-TMIN-PRBFST-T32FP50 | 11/12 |
ANN-TMIN-PRBFST-T32FP90 | 12/03 |
ANN-TMIN-PRBGSL-T32FP10 | 266.0 |
ANN-TMIN-PRBGSL-T32FP50 | 238.0 |
ANN-TMIN-PRBGSL-T32FP90 | 213.0 |