Record envelope, standing records and threshold days for Rock Mills (USC00017025), Alabama, United States, with 89 years of record.
Key Facts for Rock Mills
Rock Mills (USC00017025) is a weather station in Alabama, United States at 33.16 latitude and -85.29 longitude, 230 m (755 ft) above sea level.
The station reports from 1938 to 2026, 89 years of record.
1,464 records set at Rock Mills still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Rock Mills set a monthly record high minimum temperature of 25.0 C (77.0 F) on 29 July 2026.
About the Station
Location: Alabama, United States, 33.16 latitude, -85.29 longitude.
Elevation: 230 m (755 ft).
Period of record: 1938 to 2026, 89 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
10 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 Rock Mills. The lines show the 2026 daily maximum and minimum. 10 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Rock Mills, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
28.3 C (82.9 F)
-17.8 C (0.0 F)
22.8 C (73.0 F)
-11.7 C (10.9 F)
Feb
28.3 C (82.9 F)
-14.4 C (6.1 F)
26.7 C (80.1 F)
-9.4 C (15.1 F)
Mar
31.1 C (88.0 F)
-11.7 C (10.9 F)
29.4 C (84.9 F)
-3.9 C (25.0 F)
Apr
33.3 C (91.9 F)
-4.4 C (24.1 F)
31.1 C (88.0 F)
-0.6 C (30.9 F)
May
36.7 C (98.1 F)
-0.6 C (30.9 F)
32.2 C (90.0 F)
3.3 C (37.9 F)
Jun
40.6 C (105.1 F)
5.6 C (42.1 F)
32.8 C (91.0 F)
19.4 C (66.9 F)
Jul
41.7 C (107.1 F)
10.6 C (51.1 F)
35.0 C (95.0 F)
16.7 C (62.1 F)
Aug
40.0 C (104.0 F)
8.3 C (46.9 F)
n/a
n/a
Sep
37.8 C (100.0 F)
0.0 C (32.0 F)
36.1 C (97.0 F)
18.9 C (66.0 F)
Oct
37.2 C (99.0 F)
-6.1 C (21.0 F)
n/a
n/a
Nov
30.0 C (86.0 F)
-14.4 C (6.1 F)
n/a
n/a
Dec
26.7 C (80.1 F)
-18.3 C (-0.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Rock Mills still stand. 2000 holds the most, with 47.
Standing records at Rock Mills by the year they were set
Year set
Standing records
1941
10
1942
19
1943
35
1944
13
1945
21
1946
21
1947
24
1948
26
1949
28
1950
38
1951
30
1952
29
1953
21
1954
41
1955
21
1956
19
1957
22
1958
17
1959
13
1960
15
1961
22
1962
27
1963
21
1964
21
1965
19
1966
22
1967
42
1968
24
1969
14
1970
26
1971
28
1972
22
1973
18
1974
23
1975
13
1976
16
1977
25
1978
17
1979
18
1980
6
1982
14
1983
23
1984
12
1985
12
1986
2
1987
8
1988
7
1989
32
1990
13
1991
24
1992
15
1999
4
2000
47
2001
18
2002
13
2003
12
2004
9
2005
21
2006
20
2007
24
2008
6
2009
12
2010
15
2011
11
2012
13
2013
17
2014
8
2015
13
2016
6
2017
23
2018
9
2019
12
2020
13
2021
14
2022
19
2023
18
2024
14
2025
13
2026
11
All-Time Record Progression
1 new records
1 all-time records were set at Rock Mills between 23 March 1983 and 23 March 1983. Each dot is a new record.
When Rock Mills set new all-time records
Date
Kind
Detail
1983-03-23
Record daily snowfall
Record daily snowfall 15.2 cm (6.0 in)
Wettest Day of Each Month
Feb: 178.8 mm (7.0 in)
The wettest day on record for each calendar month at Rock Mills. The most was 178.8 mm (7.0 in) on 25 February 1961.
Record daily precipitation for each month at Rock Mills
Month
Record daily precipitation (mm)
Date
Jan
107.4 mm (4.2 in)
11 January 1972
Feb
178.8 mm (7.0 in)
25 February 1961
Mar
135.1 mm (5.3 in)
16 March 1990
Apr
115.6 mm (4.6 in)
25 April 1945
May
160.0 mm (6.3 in)
7 May 2003
Jun
147.1 mm (5.8 in)
17 June 1999
Jul
124.7 mm (4.9 in)
7 July 2005
Aug
105.7 mm (4.2 in)
11 August 2017
Sep
127.0 mm (5.0 in)
13 September 2006
Oct
120.7 mm (4.8 in)
1 October 1965
Nov
119.1 mm (4.7 in)
27 November 1948
Dec
107.7 mm (4.2 in)
21 December 1972
Period of Record Coverage
1941 to 2026
Complete yearUnder 90 percent of days
80 years of record at Rock Mills, 1941 to 2026. 26 years have data for under 90 percent of days and are left out of rankings: 1941, 1944, 1974, 1976, 1980, 1982, 1984, 1985 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 47 complete years at Rock Mills, 1943 to 2025. Blue stripes are years cooler than the station's own mean of 16.6 C (61.9 F); red stripes are warmer. The coolest year was 1968, at 15.0 C (58.9 F), and the warmest was 2023, at 18.0 C (64.5 F). The strongest colour marks a difference of 1.7 C (3.1 F).
Annual mean temperature at Rock Mills as warming stripes, 1943 to 2025
Year
Annual mean temperature
Difference from the station mean
1943
16.9 C
+0.30 C
1945
17.4 C
+0.82 C
1946
17.6 C
+1.00 C
1947
16.9 C
+0.27 C
1948
17.5 C
+0.94 C
1949
17.5 C
+0.95 C
1950
17.2 C
+0.62 C
1953
17.2 C
+0.63 C
1954
17.2 C
+0.65 C
1955
16.9 C
+0.33 C
1956
17.2 C
+0.62 C
1957
17.4 C
+0.83 C
1958
15.9 C
-0.65 C
1959
16.8 C
+0.24 C
1961
16.2 C
-0.40 C
1962
16.9 C
+0.31 C
1963
15.6 C
-1.02 C
1964
15.5 C
-1.09 C
1965
15.9 C
-0.74 C
1966
15.3 C
-1.26 C
1967
15.3 C
-1.34 C
1968
15.0 C
-1.63 C
1969
15.3 C
-1.27 C
1970
15.8 C
-0.76 C
1971
16.2 C
-0.41 C
1972
16.3 C
-0.34 C
1973
16.5 C
-0.06 C
1975
16.7 C
+0.12 C
1978
16.0 C
-0.62 C
1979
15.6 C
-0.95 C
1990
17.5 C
+0.86 C
1991
16.6 C
+0.02 C
2000
15.5 C
-1.08 C
2001
16.4 C
-0.21 C
2003
15.7 C
-0.89 C
2005
16.6 C
0.00 C
2006
17.2 C
+0.64 C
2010
15.8 C
-0.76 C
2011
16.7 C
+0.15 C
2012
17.4 C
+0.81 C
2013
16.3 C
-0.27 C
2016
17.4 C
+0.85 C
2017
17.3 C
+0.73 C
2021
17.0 C
+0.44 C
2022
17.1 C
+0.47 C
2023
18.0 C
+1.45 C
2025
17.4 C
+0.82 C
The fitted trend in annual mean temperature here over 1943 to 2025 is 0.03 C (-0.06 to 0.12) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.05 F (-0.12 to 0.21) per decade. The slope is a straight line fitted to 47 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Rock Mills
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.03 C (-0.06 to 0.12) per decade
0.05 F (-0.12 to 0.21) per decade
1943 to 2025
47
Not clearly different from zero
Mean daily maximum
0.01 C (-0.08 to 0.10) per decade
0.01 F (-0.15 to 0.17) per decade
1943 to 2025
47
Not clearly different from zero
Mean daily minimum
0.04 C (-0.08 to 0.17) per decade
0.1 F (-0.2 to 0.3) per decade
1943 to 2025
47
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
1938 to 2026
Yearly extremes at Rock Mills: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
41.7 C (107.1 F)
1952
37.2 C (99.0 F)
80
Coldest night (TNn)
-18.3 C (-0.9 F)
1962
-11.4 C (11.5 F)
80
Wettest day (Rx1day)
178.8 mm (7.0 in)
1961
77.0 mm (3.0 in)
83
Wettest five days (Rx5day)
269.0 mm (10.6 in)
1961
121.4 mm (4.8 in)
82
Longest dry spell (CDD)
46 days
2024
21 days
82
Hottest day (TXx)
The hottest day of the year at Rock Mills, 1938 to 2026. The record is 41.7 C (107.1 F) in 1952, marked on the chart; the median year is 37.2 C (99.0 F).
Hottest day (TXx) at Rock Mills by year
Year
Hottest day (TXx)
1938
n/a
1939
n/a
1940
n/a
1941
35.0 C (95.0 F)
1942
38.9 C (102.0 F)
1943
38.9 C (102.0 F)
1944
38.3 C (100.9 F)
1945
37.8 C (100.0 F)
1946
36.1 C (97.0 F)
1947
40.0 C (104.0 F)
1948
40.0 C (104.0 F)
1949
37.8 C (100.0 F)
1950
36.7 C (98.1 F)
1951
37.8 C (100.0 F)
1952
41.7 C (107.1 F)
1953
37.2 C (99.0 F)
1954
39.4 C (102.9 F)
1955
36.7 C (98.1 F)
1956
38.9 C (102.0 F)
1957
37.2 C (99.0 F)
1958
36.7 C (98.1 F)
1959
38.3 C (100.9 F)
1960
38.3 C (100.9 F)
1961
36.1 C (97.0 F)
1962
38.3 C (100.9 F)
1963
37.2 C (99.0 F)
1964
38.9 C (102.0 F)
1965
35.6 C (96.1 F)
1966
38.9 C (102.0 F)
1967
35.0 C (95.0 F)
1968
38.9 C (102.0 F)
1969
38.9 C (102.0 F)
1970
39.4 C (102.9 F)
1971
37.8 C (100.0 F)
1972
36.7 C (98.1 F)
1973
35.6 C (96.1 F)
1974
35.6 C (96.1 F)
1975
36.7 C (98.1 F)
1976
36.7 C (98.1 F)
1977
40.6 C (105.1 F)
1978
38.3 C (100.9 F)
1979
37.2 C (99.0 F)
1980
32.8 C (91.0 F)
1982
35.6 C (96.1 F)
1983
39.4 C (102.9 F)
1984
35.6 C (96.1 F)
1985
35.6 C (96.1 F)
1986
28.9 C (84.0 F)
1987
38.3 C (100.9 F)
1988
38.3 C (100.9 F)
1989
36.1 C (97.0 F)
1990
38.9 C (102.0 F)
1991
38.3 C (100.9 F)
1992
36.7 C (98.1 F)
1993
21.1 C (70.0 F)
1999
31.7 C (89.1 F)
2000
40.0 C (104.0 F)
2001
35.0 C (95.0 F)
2002
37.8 C (100.0 F)
2003
36.7 C (98.1 F)
2004
34.4 C (93.9 F)
2005
36.1 C (97.0 F)
2006
38.3 C (100.9 F)
2007
39.4 C (102.9 F)
2008
36.1 C (97.0 F)
2009
35.0 C (95.0 F)
2010
37.2 C (99.0 F)
2011
37.8 C (100.0 F)
2012
40.6 C (105.1 F)
2013
33.3 C (91.9 F)
2014
30.6 C (87.1 F)
2015
35.6 C (96.1 F)
2016
37.2 C (99.0 F)
2017
34.4 C (93.9 F)
2018
33.9 C (93.0 F)
2019
36.7 C (98.1 F)
2020
34.4 C (93.9 F)
2021
34.4 C (93.9 F)
2022
36.7 C (98.1 F)
2023
37.2 C (99.0 F)
2024
37.8 C (100.0 F)
2025
36.1 C (97.0 F)
2026
36.1 C (97.0 F)
Coldest night (TNn)
The coldest night of the year at Rock Mills, 1938 to 2026. The record is -18.3 C (-0.9 F) in 1962, marked on the chart; the median year is -11.4 C (11.5 F).
Coldest night (TNn) at Rock Mills by year
Year
Coldest night (TNn)
1938
n/a
1939
n/a
1940
n/a
1941
-6.7 C (19.9 F)
1942
-15.0 C (5.0 F)
1943
-11.7 C (10.9 F)
1944
-9.4 C (15.1 F)
1945
-10.0 C (14.0 F)
1946
-8.3 C (17.1 F)
1947
-10.0 C (14.0 F)
1948
-12.8 C (9.0 F)
1949
-6.7 C (19.9 F)
1950
-14.4 C (6.1 F)
1951
-13.9 C (7.0 F)
1952
-8.9 C (16.0 F)
1953
-11.1 C (12.0 F)
1954
-8.3 C (17.1 F)
1955
-10.6 C (12.9 F)
1956
-8.9 C (16.0 F)
1957
-11.7 C (10.9 F)
1958
-13.9 C (7.0 F)
1959
-12.2 C (10.0 F)
1960
-11.1 C (12.0 F)
1961
-13.9 C (7.0 F)
1962
-18.3 C (-0.9 F)
1963
-17.8 C (0.0 F)
1964
-14.4 C (6.1 F)
1965
-11.1 C (12.0 F)
1966
-17.8 C (0.0 F)
1967
-11.7 C (10.9 F)
1968
-11.7 C (10.9 F)
1969
-12.2 C (10.0 F)
1970
-16.1 C (3.0 F)
1971
-12.2 C (10.0 F)
1972
-13.3 C (8.1 F)
1973
-10.6 C (12.9 F)
1974
-8.3 C (17.1 F)
1975
-9.4 C (15.1 F)
1976
-12.8 C (9.0 F)
1977
-15.6 C (3.9 F)
1978
-10.6 C (12.9 F)
1979
-12.2 C (10.0 F)
1980
-10.6 C (12.9 F)
1982
-7.2 C (19.0 F)
1983
-16.7 C (1.9 F)
1984
-12.2 C (10.0 F)
1985
-15.0 C (5.0 F)
1986
-6.1 C (21.0 F)
1987
-10.0 C (14.0 F)
1988
-9.4 C (15.1 F)
1989
-13.9 C (7.0 F)
1990
-6.1 C (21.0 F)
1991
-11.1 C (12.0 F)
1992
-11.1 C (12.0 F)
1993
-7.8 C (18.0 F)
1999
-9.4 C (15.1 F)
2000
-14.4 C (6.1 F)
2001
-15.6 C (3.9 F)
2002
-10.6 C (12.9 F)
2003
-15.0 C (5.0 F)
2004
-12.2 C (10.0 F)
2005
-11.1 C (12.0 F)
2006
-11.7 C (10.9 F)
2007
-9.4 C (15.1 F)
2008
-10.6 C (12.9 F)
2009
-6.7 C (19.9 F)
2010
-12.2 C (10.0 F)
2011
-11.7 C (10.9 F)
2012
-9.4 C (15.1 F)
2013
-7.8 C (18.0 F)
2014
-17.2 C (1.0 F)
2015
-13.3 C (8.1 F)
2016
-9.4 C (15.1 F)
2017
-10.0 C (14.0 F)
2018
-12.8 C (9.0 F)
2019
-7.2 C (19.0 F)
2020
-8.3 C (17.1 F)
2021
-6.1 C (21.0 F)
2022
-14.4 C (6.1 F)
2023
-7.8 C (18.0 F)
2024
-12.8 C (9.0 F)
2025
-11.7 C (10.9 F)
2026
-11.7 C (10.9 F)
Wettest day (Rx1day)
The wettest day of the year at Rock Mills, 1938 to 2026. The record is 178.8 mm (7.0 in) in 1961, marked on the chart; the median year is 77.0 mm (3.0 in).
Wettest day (Rx1day) at Rock Mills by year
Year
Wettest day (Rx1day)
1938
70.4 mm (2.8 in)
1939
110.0 mm (4.3 in)
1940
61.2 mm (2.4 in)
1941
76.2 mm (3.0 in)
1942
83.8 mm (3.3 in)
1943
92.7 mm (3.6 in)
1944
65.3 mm (2.6 in)
1945
115.6 mm (4.6 in)
1946
61.2 mm (2.4 in)
1947
74.9 mm (2.9 in)
1948
119.1 mm (4.7 in)
1949
74.7 mm (2.9 in)
1950
53.6 mm (2.1 in)
1951
59.9 mm (2.4 in)
1952
87.1 mm (3.4 in)
1953
78.7 mm (3.1 in)
1954
53.8 mm (2.1 in)
1955
66.0 mm (2.6 in)
1956
111.8 mm (4.4 in)
1957
98.3 mm (3.9 in)
1958
78.2 mm (3.1 in)
1959
76.5 mm (3.0 in)
1960
96.5 mm (3.8 in)
1961
178.8 mm (7.0 in)
1962
95.5 mm (3.8 in)
1963
64.8 mm (2.6 in)
1964
85.6 mm (3.4 in)
1965
120.7 mm (4.8 in)
1966
91.9 mm (3.6 in)
1967
71.6 mm (2.8 in)
1968
94.2 mm (3.7 in)
1969
99.1 mm (3.9 in)
1970
77.2 mm (3.0 in)
1971
78.7 mm (3.1 in)
1972
107.7 mm (4.2 in)
1973
69.9 mm (2.8 in)
1974
58.9 mm (2.3 in)
1975
83.6 mm (3.3 in)
1976
91.9 mm (3.6 in)
1977
81.3 mm (3.2 in)
1978
58.4 mm (2.3 in)
1979
76.2 mm (3.0 in)
1980
67.6 mm (2.7 in)
1982
81.3 mm (3.2 in)
1983
75.7 mm (3.0 in)
1984
37.8 mm (1.5 in)
1985
42.9 mm (1.7 in)
1986
50.0 mm (2.0 in)
1987
54.1 mm (2.1 in)
1988
122.7 mm (4.8 in)
1989
90.2 mm (3.6 in)
1990
135.1 mm (5.3 in)
1991
89.7 mm (3.5 in)
1992
96.3 mm (3.8 in)
1993
22.9 mm (0.9 in)
1999
147.1 mm (5.8 in)
2000
77.0 mm (3.0 in)
2001
90.7 mm (3.6 in)
2002
62.5 mm (2.5 in)
2003
160.0 mm (6.3 in)
2004
53.3 mm (2.1 in)
2005
124.7 mm (4.9 in)
2006
127.0 mm (5.0 in)
2007
44.5 mm (1.8 in)
2008
38.9 mm (1.5 in)
2009
97.8 mm (3.9 in)
2010
102.1 mm (4.0 in)
2011
69.1 mm (2.7 in)
2012
61.2 mm (2.4 in)
2013
80.0 mm (3.1 in)
2014
76.2 mm (3.0 in)
2015
55.9 mm (2.2 in)
2016
73.7 mm (2.9 in)
2017
105.7 mm (4.2 in)
2018
83.8 mm (3.3 in)
2019
71.6 mm (2.8 in)
2020
72.9 mm (2.9 in)
2021
67.8 mm (2.7 in)
2022
63.5 mm (2.5 in)
2023
63.5 mm (2.5 in)
2024
93.2 mm (3.7 in)
2025
76.2 mm (3.0 in)
2026
51.3 mm (2.0 in)
Wettest five days (Rx5day)
The wettest five days of the year at Rock Mills, 1938 to 2026. The record is 269.0 mm (10.6 in) in 1961, marked on the chart; the median year is 121.4 mm (4.8 in).
Wettest five days (Rx5day) at Rock Mills by year
Year
Wettest five days (Rx5day)
1938
97.1 mm (3.8 in)
1939
139.2 mm (5.5 in)
1940
135.3 mm (5.3 in)
1941
114.3 mm (4.5 in)
1942
118.7 mm (4.7 in)
1943
142.7 mm (5.6 in)
1944
132.9 mm (5.2 in)
1945
172.8 mm (6.8 in)
1946
98.7 mm (3.9 in)
1947
157.5 mm (6.2 in)
1948
220.7 mm (8.7 in)
1949
165.9 mm (6.5 in)
1950
86.1 mm (3.4 in)
1951
120.6 mm (4.7 in)
1952
126.7 mm (5.0 in)
1953
164.7 mm (6.5 in)
1954
93.4 mm (3.7 in)
1955
108.9 mm (4.3 in)
1956
152.9 mm (6.0 in)
1957
138.7 mm (5.5 in)
1958
88.1 mm (3.5 in)
1959
83.5 mm (3.3 in)
1960
121.9 mm (4.8 in)
1961
269.0 mm (10.6 in)
1962
142.5 mm (5.6 in)
1963
100.6 mm (4.0 in)
1964
156.3 mm (6.2 in)
1965
134.1 mm (5.3 in)
1966
149.3 mm (5.9 in)
1967
115.3 mm (4.5 in)
1968
99.1 mm (3.9 in)
1969
147.1 mm (5.8 in)
1970
118.3 mm (4.7 in)
1971
165.8 mm (6.5 in)
1972
166.3 mm (6.5 in)
1973
110.3 mm (4.3 in)
1974
85.8 mm (3.4 in)
1975
132.4 mm (5.2 in)
1976
151.9 mm (6.0 in)
1977
100.0 mm (3.9 in)
1978
102.1 mm (4.0 in)
1979
129.6 mm (5.1 in)
1980
120.9 mm (4.8 in)
1982
106.7 mm (4.2 in)
1983
130.0 mm (5.1 in)
1984
74.9 mm (2.9 in)
1985
86.1 mm (3.4 in)
1986
103.4 mm (4.1 in)
1987
90.4 mm (3.6 in)
1988
162.3 mm (6.4 in)
1989
149.7 mm (5.9 in)
1990
200.4 mm (7.9 in)
1991
141.8 mm (5.6 in)
1992
115.3 mm (4.5 in)
1993
n/a
1999
208.3 mm (8.2 in)
2000
96.0 mm (3.8 in)
2001
131.4 mm (5.2 in)
2002
86.8 mm (3.4 in)
2003
78.7 mm (3.1 in)
2004
83.2 mm (3.3 in)
2005
183.2 mm (7.2 in)
2006
130.6 mm (5.1 in)
2007
81.8 mm (3.2 in)
2008
81.8 mm (3.2 in)
2009
109.5 mm (4.3 in)
2010
133.9 mm (5.3 in)
2011
120.1 mm (4.7 in)
2012
83.6 mm (3.3 in)
2013
154.4 mm (6.1 in)
2014
82.8 mm (3.3 in)
2015
135.1 mm (5.3 in)
2016
106.5 mm (4.2 in)
2017
150.1 mm (5.9 in)
2018
144.9 mm (5.7 in)
2019
116.6 mm (4.6 in)
2020
144.3 mm (5.7 in)
2021
86.4 mm (3.4 in)
2022
90.9 mm (3.6 in)
2023
101.6 mm (4.0 in)
2024
174.7 mm (6.9 in)
2025
132.3 mm (5.2 in)
2026
75.0 mm (3.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at Rock Mills, 1938 to 2026. The record is 46 days in 2024, marked on the chart; the median year is 21 days.
Longest dry spell (CDD) at Rock Mills by year
Year
Longest dry spell (CDD)
1938
21 days
1939
34 days
1940
42 days
1941
21 days
1942
21 days
1943
23 days
1944
23 days
1945
12 days
1946
24 days
1947
20 days
1948
21 days
1949
28 days
1950
26 days
1951
25 days
1952
30 days
1953
29 days
1954
20 days
1955
23 days
1956
18 days
1957
19 days
1958
27 days
1959
20 days
1960
20 days
1961
30 days
1962
17 days
1963
33 days
1964
34 days
1965
16 days
1966
22 days
1967
18 days
1968
22 days
1969
18 days
1970
21 days
1971
23 days
1972
23 days
1973
27 days
1974
19 days
1975
19 days
1976
13 days
1977
16 days
1978
24 days
1979
20 days
1980
9 days
1982
19 days
1983
21 days
1984
27 days
1985
18 days
1986
7 days
1987
26 days
1988
15 days
1989
20 days
1990
18 days
1991
36 days
1992
15 days
1993
n/a
1999
22 days
2000
28 days
2001
41 days
2002
15 days
2003
15 days
2004
15 days
2005
22 days
2006
22 days
2007
22 days
2008
15 days
2009
25 days
2010
15 days
2011
15 days
2012
18 days
2013
20 days
2014
14 days
2015
14 days
2016
43 days
2017
20 days
2018
22 days
2019
20 days
2020
15 days
2021
17 days
2022
29 days
2023
25 days
2024
46 days
2025
28 days
2026
39 days
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
47 years with a frost
Across 47 years with a frost, the median last spring frost at Rock Mills falls on 9 April and the median first autumn frost on 30 October, which leaves a median of 202 days between them.
Fitted over all years, the growing season changes by +0.1 days per decade at this station.
Frost dates and growing season at Rock Mills
Measure
Median, all years
Earliest period
Recent period (1964 to 2025)
Recent against earliest
Fitted trend
Last spring frost
9 April
n/a
9 April
n/a
-0.4 days per decade
First autumn frost
30 October
n/a
29 October
n/a
-0.4 days per decade
Growing days
202 days
n/a
203 days
n/a
+0.1 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
56 years, 1939 to 2025
A day with at least 82.1 mm (3.2 in) of rain is expected about once in 2 years. A day with at least 169.5 mm (6.7 in) of rain is expected about once in 100 years.
Rainfall return levels at Rock Mills: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
82.1 mm (3.2 in)
5 years
102.8 mm (4.0 in)
10 years
117.5 mm (4.6 in)
25 years
137.4 mm (5.4 in)
50 years
153.0 mm (6.0 in)
100 years
169.5 mm (6.7 in)
Longer than the 56 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, 56 years of values from 1939 to 2025.
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: 178.8 mm (7.0 in) in 1961; 147.1 mm (5.8 in) in 1999; 127.0 mm (5.0 in) in 2006.
Station Changes
2 suspected
2 changes were suspected in the annual mean temperature of Rock Mills, at 1963 and 1969. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1963 ran 0.5 C (0.8 F) lower than in the years before (likely change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1969 ran 0.3 C (0.5 F) higher than in the years before (possible change).
Suspected changes in the annual mean temperature at Rock Mills, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1963
-0.5
-0.8
likely
5
1969
+0.3
+0.5
possible
5
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
Climate Twins
2000 to 2025 against 1961 to 1990
Over 2000 to 2025, Rock Mills had a mean temperature of 16.8 C (62.2 F) and 1,259.4 mm (49.6 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Forsyth 6 NNW (United States, 127 km away), Newberry (United States, 362 km away) and Pelion 0.8 NW (United States, 380 km away).
Climate twins of Rock Mills: stations whose 1961 to 1990 climate is closest to its 2000 to 2025 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 Rock Mills standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Rock Mills 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.