Record envelope, standing records and threshold days for Johnston 4 SW (USC00384607), South Carolina, United States, with 70 years of record.
Key Facts for Johnston 4 SW
Johnston 4 SW (USC00384607) is a weather station in South Carolina, United States at 33.78 latitude and -81.85 longitude, 191 m (627 ft) above sea level.
The station reports from 1957 to 2026, 70 years of record.
1,464 records set at Johnston 4 SW still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Johnston 4 SW tied a daily record high minimum temperature of 23.9 C (75.0 F) on 9 July 2025.
About the Station
Location: South Carolina, United States, 33.78 latitude, -81.85 longitude.
Elevation: 191 m (627 ft).
Period of record: 1957 to 2026, 70 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
0 days at or beyond a record
Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Johnston 4 SW. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Johnston 4 SW, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
27.2 C (81.0 F)
-18.9 C (-2.0 F)
n/a
n/a
Feb
28.3 C (82.9 F)
-13.3 C (8.1 F)
n/a
n/a
Mar
31.7 C (89.1 F)
-17.2 C (1.0 F)
n/a
n/a
Apr
34.4 C (93.9 F)
-7.2 C (19.0 F)
n/a
n/a
May
37.8 C (100.0 F)
1.1 C (34.0 F)
n/a
n/a
Jun
41.1 C (106.0 F)
7.8 C (46.0 F)
n/a
n/a
Jul
43.9 C (111.0 F)
11.1 C (52.0 F)
n/a
n/a
Aug
43.3 C (109.9 F)
7.8 C (46.0 F)
n/a
n/a
Sep
40.6 C (105.1 F)
2.2 C (36.0 F)
n/a
n/a
Oct
35.6 C (96.1 F)
-4.4 C (24.1 F)
n/a
n/a
Nov
31.7 C (89.1 F)
-9.4 C (15.1 F)
n/a
n/a
Dec
27.2 C (81.0 F)
-16.1 C (3.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Johnston 4 SW still stand. 2002 holds the most, with 45.
Standing records at Johnston 4 SW by the year they were set
Year set
Standing records
1957
15
1958
22
1959
23
1960
17
1961
27
1962
18
1963
29
1964
30
1965
12
1966
9
1967
32
1968
27
1969
25
1970
28
1971
30
1972
15
1973
17
1974
25
1975
13
1976
17
1977
30
1978
12
1979
33
1980
26
1981
15
1982
19
1983
21
1984
26
1985
21
1986
31
1987
10
1988
12
1989
32
1990
10
1991
23
1992
8
1993
22
1994
9
1995
15
1996
27
1997
31
1998
29
1999
27
2000
28
2001
28
2002
45
2003
6
2004
24
2005
20
2006
19
2007
30
2008
24
2009
10
2010
35
2011
18
2012
22
2013
22
2014
22
2015
23
2016
11
2017
28
2018
23
2019
23
2020
19
2021
18
2022
15
2023
8
2024
21
2025
2
All-Time Record Progression
3 new records
3 all-time records were set at Johnston 4 SW between 10 August 2007 and 1 July 2012. Each dot is a new record.
When Johnston 4 SW set new all-time records
Date
Kind
Detail
2007-08-10
Record high maximum temperature
Record high maximum temperature 42.8 C (109.0 F)
2007-08-11
Record high maximum temperature
Record high maximum temperature 43.3 C (109.9 F)
2012-07-01
Record high maximum temperature
Record high maximum temperature 43.9 C (111.0 F)
Wettest Day of Each Month
Aug: 161.3 mm (6.4 in)
The wettest day on record for each calendar month at Johnston 4 SW. The most was 161.3 mm (6.4 in) on 30 August 1964.
Record daily precipitation for each month at Johnston 4 SW
Month
Record daily precipitation (mm)
Date
Jan
88.9 mm (3.5 in)
21 January 1979
Feb
85.1 mm (3.4 in)
11 February 1995
Mar
99.3 mm (3.9 in)
2 March 2007
Apr
94.0 mm (3.7 in)
1 April 1961
May
118.1 mm (4.6 in)
22 May 2003
Jun
130.3 mm (5.1 in)
28 June 1994
Jul
102.1 mm (4.0 in)
17 July 2017
Aug
161.3 mm (6.4 in)
30 August 1964
Sep
136.1 mm (5.4 in)
4 September 1998
Oct
127.8 mm (5.0 in)
2 October 1985
Nov
100.3 mm (3.9 in)
11 November 2009
Dec
82.6 mm (3.3 in)
24 December 2014
Period of Record Coverage
1957 to 2025
Complete yearUnder 90 percent of days
69 years of record at Johnston 4 SW, 1957 to 2025. 6 years have data for under 90 percent of days and are left out of rankings: 1957, 1966, 2007, 2019, 2020, 2025.
Cooler than the station meanWarmer than the station mean
One stripe for each of 59 complete years at Johnston 4 SW, 1958 to 2024. Blue stripes are years cooler than the station's own mean of 16.6 C (61.8 F); red stripes are warmer. The coolest year was 1979, at 15.6 C (60.0 F), and the warmest was 2017, at 18.2 C (64.7 F). The strongest colour marks a difference of 1.7 C (3.1 F).
Annual mean temperature at Johnston 4 SW as warming stripes, 1958 to 2024
Year
Annual mean temperature
Difference from the station mean
1958
15.9 C
-0.66 C
1959
16.9 C
+0.37 C
1960
16.1 C
-0.43 C
1961
16.5 C
-0.04 C
1962
16.5 C
-0.01 C
1963
15.9 C
-0.68 C
1964
16.1 C
-0.45 C
1965
16.2 C
-0.32 C
1967
15.8 C
-0.75 C
1968
15.8 C
-0.80 C
1969
15.6 C
-0.91 C
1970
16.5 C
-0.10 C
1971
16.6 C
0.00 C
1972
16.2 C
-0.40 C
1973
16.3 C
-0.29 C
1974
17.0 C
+0.41 C
1975
16.9 C
+0.33 C
1976
15.9 C
-0.69 C
1977
16.2 C
-0.32 C
1978
16.0 C
-0.57 C
1979
15.6 C
-0.99 C
1980
16.1 C
-0.46 C
1981
16.0 C
-0.51 C
1982
16.9 C
+0.32 C
1983
16.0 C
-0.57 C
1984
16.7 C
+0.13 C
1985
16.9 C
+0.38 C
1986
17.7 C
+1.11 C
1987
16.5 C
-0.03 C
1988
16.1 C
-0.49 C
1989
16.6 C
+0.03 C
1991
16.8 C
+0.22 C
1992
16.2 C
-0.38 C
1993
16.7 C
+0.15 C
1994
16.7 C
+0.13 C
1995
16.7 C
+0.14 C
1996
16.0 C
-0.58 C
1997
16.1 C
-0.41 C
1999
16.9 C
+0.35 C
2000
16.2 C
-0.33 C
2001
16.5 C
-0.04 C
2002
16.3 C
-0.26 C
2003
16.2 C
-0.36 C
2005
15.7 C
-0.88 C
2008
16.2 C
-0.37 C
2009
15.9 C
-0.66 C
2010
16.6 C
0.00 C
2011
16.9 C
+0.35 C
2012
17.9 C
+1.39 C
2013
16.3 C
-0.21 C
2014
16.4 C
-0.13 C
2015
17.6 C
+1.06 C
2016
18.1 C
+1.55 C
2017
18.2 C
+1.63 C
2018
17.6 C
+1.02 C
2021
17.4 C
+0.83 C
2022
17.4 C
+0.84 C
2023
17.6 C
+1.08 C
2024
18.1 C
+1.50 C
The annual mean temperature here has risen by 0.2 C (0.1 to 0.3) per decade over 1958 to 2024. In Fahrenheit: 0.3 F (0.2 to 0.5) per decade. The slope is a straight line fitted to 59 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Johnston 4 SW
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.2 C (0.1 to 0.3) per decade
0.3 F (0.2 to 0.5) per decade
1958 to 2024
59
Rise
Mean daily maximum
0.3 C (0.2 to 0.4) per decade
0.5 F (0.4 to 0.7) per decade
1958 to 2024
59
Rise
Mean daily minimum
0.10 C (-0.03 to 0.22) per decade
0.18 F (-0.05 to 0.40) per decade
1958 to 2024
59
Not clearly different from zero
A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.
Extremes by Year
1957 to 2026
Yearly extremes at Johnston 4 SW: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
43.9 C (111.0 F)
2012
37.8 C (100.0 F)
69
Coldest night (TNn)
-18.9 C (-2.0 F)
1985
-11.1 C (12.0 F)
69
Wettest day (Rx1day)
161.3 mm (6.4 in)
1964
77.9 mm (3.1 in)
70
Wettest five days (Rx5day)
231.0 mm (9.1 in)
1965
116.0 mm (4.6 in)
69
Longest dry spell (CDD)
41 days
1961
20 days
70
Hottest day (TXx)
The hottest day of the year at Johnston 4 SW, 1957 to 2026. The record is 43.9 C (111.0 F) in 2012, marked on the chart; the median year is 37.8 C (100.0 F).
Hottest day (TXx) at Johnston 4 SW by year
Year
Hottest day (TXx)
1957
36.7 C (98.1 F)
1958
41.1 C (106.0 F)
1959
37.8 C (100.0 F)
1960
36.1 C (97.0 F)
1961
36.1 C (97.0 F)
1962
36.7 C (98.1 F)
1963
36.1 C (97.0 F)
1964
36.7 C (98.1 F)
1965
35.6 C (96.1 F)
1966
37.8 C (100.0 F)
1967
34.4 C (93.9 F)
1968
38.9 C (102.0 F)
1969
36.1 C (97.0 F)
1970
38.3 C (100.9 F)
1971
36.1 C (97.0 F)
1972
35.6 C (96.1 F)
1973
34.4 C (93.9 F)
1974
35.0 C (95.0 F)
1975
37.8 C (100.0 F)
1976
36.1 C (97.0 F)
1977
41.1 C (106.0 F)
1978
38.9 C (102.0 F)
1979
37.2 C (99.0 F)
1980
41.7 C (107.1 F)
1981
37.8 C (100.0 F)
1982
35.0 C (95.0 F)
1983
41.1 C (106.0 F)
1984
37.2 C (99.0 F)
1985
37.8 C (100.0 F)
1986
40.6 C (105.1 F)
1987
37.8 C (100.0 F)
1988
38.9 C (102.0 F)
1989
36.1 C (97.0 F)
1990
40.0 C (104.0 F)
1991
37.2 C (99.0 F)
1992
37.8 C (100.0 F)
1993
40.0 C (104.0 F)
1994
37.8 C (100.0 F)
1995
40.0 C (104.0 F)
1996
39.4 C (102.9 F)
1997
41.1 C (106.0 F)
1998
40.0 C (104.0 F)
1999
41.7 C (107.1 F)
2000
40.6 C (105.1 F)
2001
38.3 C (100.9 F)
2002
41.7 C (107.1 F)
2003
36.1 C (97.0 F)
2004
38.9 C (102.0 F)
2005
39.4 C (102.9 F)
2006
38.9 C (102.0 F)
2007
43.3 C (109.9 F)
2008
40.6 C (105.1 F)
2009
38.9 C (102.0 F)
2010
41.1 C (106.0 F)
2011
40.0 C (104.0 F)
2012
43.9 C (111.0 F)
2013
35.0 C (95.0 F)
2014
37.8 C (100.0 F)
2015
39.4 C (102.9 F)
2016
38.3 C (100.9 F)
2017
36.1 C (97.0 F)
2018
37.2 C (99.0 F)
2019
37.8 C (100.0 F)
2020
35.0 C (95.0 F)
2021
35.6 C (96.1 F)
2022
38.3 C (100.9 F)
2023
36.1 C (97.0 F)
2024
38.3 C (100.9 F)
2025
36.7 C (98.1 F)
2026
n/a
Coldest night (TNn)
The coldest night of the year at Johnston 4 SW, 1957 to 2026. The record is -18.9 C (-2.0 F) in 1985, marked on the chart; the median year is -11.1 C (12.0 F).
Coldest night (TNn) at Johnston 4 SW by year
Year
Coldest night (TNn)
1957
-11.1 C (12.0 F)
1958
-13.3 C (8.1 F)
1959
-10.6 C (12.9 F)
1960
-11.1 C (12.0 F)
1961
-11.1 C (12.0 F)
1962
-16.1 C (3.0 F)
1963
-11.7 C (10.9 F)
1964
-9.4 C (15.1 F)
1965
-7.8 C (18.0 F)
1966
-16.7 C (1.9 F)
1967
-12.2 C (10.0 F)
1968
-8.9 C (16.0 F)
1969
-10.0 C (14.0 F)
1970
-15.0 C (5.0 F)
1971
-10.0 C (14.0 F)
1972
-11.1 C (12.0 F)
1973
-10.0 C (14.0 F)
1974
-8.9 C (16.0 F)
1975
-10.6 C (12.9 F)
1976
-10.6 C (12.9 F)
1977
-15.0 C (5.0 F)
1978
-13.3 C (8.1 F)
1979
-11.7 C (10.9 F)
1980
-17.2 C (1.0 F)
1981
-10.6 C (12.9 F)
1982
-17.2 C (1.0 F)
1983
-15.0 C (5.0 F)
1984
-9.4 C (15.1 F)
1985
-18.9 C (-2.0 F)
1986
-13.9 C (7.0 F)
1987
-6.1 C (21.0 F)
1988
-8.9 C (16.0 F)
1989
-11.1 C (12.0 F)
1990
-5.6 C (21.9 F)
1991
-11.7 C (10.9 F)
1992
-6.1 C (21.0 F)
1993
-8.9 C (16.0 F)
1994
-12.8 C (9.0 F)
1995
-11.1 C (12.0 F)
1996
-12.2 C (10.0 F)
1997
-8.3 C (17.1 F)
1998
-8.3 C (17.1 F)
1999
-11.1 C (12.0 F)
2000
-12.2 C (10.0 F)
2001
-16.7 C (1.9 F)
2002
-12.2 C (10.0 F)
2003
-11.7 C (10.9 F)
2004
-11.7 C (10.9 F)
2005
-15.0 C (5.0 F)
2006
-12.2 C (10.0 F)
2007
-10.0 C (14.0 F)
2008
-10.0 C (14.0 F)
2009
-12.2 C (10.0 F)
2010
-11.7 C (10.9 F)
2011
-9.4 C (15.1 F)
2012
-8.3 C (17.1 F)
2013
-6.7 C (19.9 F)
2014
-13.9 C (7.0 F)
2015
-13.3 C (8.1 F)
2016
-7.2 C (19.0 F)
2017
-8.3 C (17.1 F)
2018
-12.2 C (10.0 F)
2019
-6.7 C (19.9 F)
2020
-6.7 C (19.9 F)
2021
-5.0 C (23.0 F)
2022
-12.8 C (9.0 F)
2023
-5.0 C (23.0 F)
2024
-10.6 C (12.9 F)
2025
-8.3 C (17.1 F)
2026
n/a
Wettest day (Rx1day)
The wettest day of the year at Johnston 4 SW, 1957 to 2026. The record is 161.3 mm (6.4 in) in 1964, marked on the chart; the median year is 77.9 mm (3.1 in).
Wettest day (Rx1day) at Johnston 4 SW by year
Year
Wettest day (Rx1day)
1957
50.5 mm (2.0 in)
1958
53.3 mm (2.1 in)
1959
132.3 mm (5.2 in)
1960
66.0 mm (2.6 in)
1961
94.0 mm (3.7 in)
1962
78.7 mm (3.1 in)
1963
102.4 mm (4.0 in)
1964
161.3 mm (6.4 in)
1965
120.4 mm (4.7 in)
1966
64.0 mm (2.5 in)
1967
76.5 mm (3.0 in)
1968
66.8 mm (2.6 in)
1969
69.9 mm (2.8 in)
1970
94.5 mm (3.7 in)
1971
79.0 mm (3.1 in)
1972
59.7 mm (2.4 in)
1973
114.3 mm (4.5 in)
1974
94.0 mm (3.7 in)
1975
87.4 mm (3.4 in)
1976
81.5 mm (3.2 in)
1977
77.0 mm (3.0 in)
1978
73.7 mm (2.9 in)
1979
88.9 mm (3.5 in)
1980
72.4 mm (2.9 in)
1981
84.3 mm (3.3 in)
1982
48.3 mm (1.9 in)
1983
86.6 mm (3.4 in)
1984
87.4 mm (3.4 in)
1985
127.8 mm (5.0 in)
1986
67.1 mm (2.6 in)
1987
59.2 mm (2.3 in)
1988
64.0 mm (2.5 in)
1989
68.6 mm (2.7 in)
1990
89.7 mm (3.5 in)
1991
64.0 mm (2.5 in)
1992
110.0 mm (4.3 in)
1993
60.2 mm (2.4 in)
1994
130.3 mm (5.1 in)
1995
85.1 mm (3.4 in)
1996
67.8 mm (2.7 in)
1997
59.9 mm (2.4 in)
1998
136.1 mm (5.4 in)
1999
49.3 mm (1.9 in)
2000
91.2 mm (3.6 in)
2001
63.0 mm (2.5 in)
2002
65.0 mm (2.6 in)
2003
118.1 mm (4.6 in)
2004
104.9 mm (4.1 in)
2005
88.9 mm (3.5 in)
2006
64.8 mm (2.6 in)
2007
99.3 mm (3.9 in)
2008
68.1 mm (2.7 in)
2009
100.3 mm (3.9 in)
2010
67.8 mm (2.7 in)
2011
46.0 mm (1.8 in)
2012
50.3 mm (2.0 in)
2013
71.1 mm (2.8 in)
2014
82.6 mm (3.3 in)
2015
111.8 mm (4.4 in)
2016
70.4 mm (2.8 in)
2017
102.1 mm (4.0 in)
2018
87.6 mm (3.4 in)
2019
44.2 mm (1.7 in)
2020
95.3 mm (3.8 in)
2021
75.7 mm (3.0 in)
2022
89.2 mm (3.5 in)
2023
58.9 mm (2.3 in)
2024
97.3 mm (3.8 in)
2025
51.3 mm (2.0 in)
2026
0.0 mm (0.00 in)
Wettest five days (Rx5day)
The wettest five days of the year at Johnston 4 SW, 1957 to 2026. The record is 231.0 mm (9.1 in) in 1965, marked on the chart; the median year is 116.0 mm (4.6 in).
Wettest five days (Rx5day) at Johnston 4 SW by year
Year
Wettest five days (Rx5day)
1957
87.1 mm (3.4 in)
1958
74.4 mm (2.9 in)
1959
133.8 mm (5.3 in)
1960
98.1 mm (3.9 in)
1961
148.7 mm (5.9 in)
1962
118.8 mm (4.7 in)
1963
118.6 mm (4.7 in)
1964
223.6 mm (8.8 in)
1965
231.0 mm (9.1 in)
1966
79.5 mm (3.1 in)
1967
151.6 mm (6.0 in)
1968
98.6 mm (3.9 in)
1969
123.0 mm (4.8 in)
1970
138.5 mm (5.5 in)
1971
113.3 mm (4.5 in)
1972
103.9 mm (4.1 in)
1973
154.4 mm (6.1 in)
1974
125.9 mm (5.0 in)
1975
184.2 mm (7.3 in)
1976
133.3 mm (5.2 in)
1977
141.5 mm (5.6 in)
1978
91.0 mm (3.6 in)
1979
114.8 mm (4.5 in)
1980
123.6 mm (4.9 in)
1981
90.2 mm (3.6 in)
1982
94.3 mm (3.7 in)
1983
97.5 mm (3.8 in)
1984
88.4 mm (3.5 in)
1985
190.5 mm (7.5 in)
1986
96.1 mm (3.8 in)
1987
116.1 mm (4.6 in)
1988
104.1 mm (4.1 in)
1989
107.2 mm (4.2 in)
1990
191.4 mm (7.5 in)
1991
116.0 mm (4.6 in)
1992
133.1 mm (5.2 in)
1993
91.0 mm (3.6 in)
1994
170.5 mm (6.7 in)
1995
99.2 mm (3.9 in)
1996
97.0 mm (3.8 in)
1997
126.5 mm (5.0 in)
1998
136.1 mm (5.4 in)
1999
76.8 mm (3.0 in)
2000
140.0 mm (5.5 in)
2001
104.1 mm (4.1 in)
2002
154.7 mm (6.1 in)
2003
118.1 mm (4.6 in)
2004
145.0 mm (5.7 in)
2005
118.9 mm (4.7 in)
2006
105.1 mm (4.1 in)
2007
108.2 mm (4.3 in)
2008
94.0 mm (3.7 in)
2009
113.8 mm (4.5 in)
2010
93.2 mm (3.7 in)
2011
98.6 mm (3.9 in)
2012
63.5 mm (2.5 in)
2013
155.4 mm (6.1 in)
2014
107.8 mm (4.2 in)
2015
138.5 mm (5.5 in)
2016
87.2 mm (3.4 in)
2017
124.4 mm (4.9 in)
2018
109.2 mm (4.3 in)
2019
98.6 mm (3.9 in)
2020
138.4 mm (5.4 in)
2021
188.0 mm (7.4 in)
2022
125.5 mm (4.9 in)
2023
105.1 mm (4.1 in)
2024
165.4 mm (6.5 in)
2025
76.0 mm (3.0 in)
2026
n/a
Longest dry spell (CDD)
The longest dry spell of the year at Johnston 4 SW, 1957 to 2026. The record is 41 days in 1961, marked on the chart; the median year is 20 days.
Longest dry spell (CDD) at Johnston 4 SW by year
Year
Longest dry spell (CDD)
1957
18 days
1958
24 days
1959
17 days
1960
21 days
1961
41 days
1962
17 days
1963
18 days
1964
28 days
1965
19 days
1966
18 days
1967
19 days
1968
26 days
1969
18 days
1970
22 days
1971
20 days
1972
21 days
1973
26 days
1974
28 days
1975
19 days
1976
20 days
1977
15 days
1978
34 days
1979
19 days
1980
26 days
1981
23 days
1982
20 days
1983
19 days
1984
25 days
1985
21 days
1986
25 days
1987
26 days
1988
16 days
1989
17 days
1990
18 days
1991
19 days
1992
19 days
1993
18 days
1994
13 days
1995
28 days
1996
21 days
1997
13 days
1998
25 days
1999
25 days
2000
28 days
2001
39 days
2002
26 days
2003
17 days
2004
17 days
2005
33 days
2006
19 days
2007
24 days
2008
13 days
2009
17 days
2010
37 days
2011
16 days
2012
18 days
2013
24 days
2014
16 days
2015
18 days
2016
35 days
2017
17 days
2018
22 days
2019
25 days
2020
30 days
2021
23 days
2022
17 days
2023
23 days
2024
35 days
2025
7 days
2026
1 day
Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.
Frost Dates and Growing Season
59 years with a frost
Across 59 years with a frost, the median last spring frost at Johnston 4 SW falls on 27 March and the median first autumn frost on 4 November, which leaves a median of 223 days between them.
Fitted over all years, the growing season changes by -2.0 days per decade at this station.
Frost dates and growing season at Johnston 4 SW
Measure
Median, all years
Earliest period
Recent period (1988 to 2024)
Recent against earliest
Fitted trend
Last spring frost
27 March
n/a
1 April
n/a
+1.5 days per decade
First autumn frost
4 November
n/a
1 November
n/a
-0.5 days per decade
Growing days
223 days
n/a
221 days
n/a
-2.0 days per decade
A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.
Rainfall Return Levels
63 years, 1958 to 2024
A day with at least 79.3 mm (3.1 in) of rain is expected about once in 2 years. A day with at least 162.7 mm (6.4 in) of rain is expected about once in 100 years.
Rainfall return levels at Johnston 4 SW: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
79.3 mm (3.1 in)
5 years
101.0 mm (4.0 in)
10 years
115.7 mm (4.6 in)
25 years
134.5 mm (5.3 in)
50 years
148.6 mm (5.9 in)
100 years
162.7 mm (6.4 in)
Longer than the 63 years of record
The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 63 years of values from 1958 to 2024.
A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.
The largest wettest-day totals in the fit: 161.3 mm (6.4 in) in 1964; 136.1 mm (5.4 in) in 1998; 132.3 mm (5.2 in) in 1959.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Climate Twins
2008 to 2024 against 1961 to 1990
Over 2008 to 2024, Johnston 4 SW had a mean temperature of 17.2 C (63.0 F) and 1,195.9 mm (47.1 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Sumter (United States, 140 km away), Sandersville (United States, 126 km away) and Laurinburg (United States, 244 km away).
Climate twins of Johnston 4 SW: stations whose 1961 to 1990 climate is closest to its 2008 to 2024 climate
Twins are stations, not cities. A twin is one of the three stations at least 100 km away whose earlier climate is closest to this station's recent one, so a close match does not mean the two places look alike in other ways. A station move or a gap in a record can change that station's averages. The list describes past climate; it is not a forecast and does not say what caused any change. How twins are found, and a search for any station.
Download the Data
Data for Johnston 4 SW standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Johnston 4 SW threshold days by year: CSV or JSON. Field meanings are on the data page.
Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-14 (14 October 2026). Records are computed by this site and are not official.