Record envelope, standing records and threshold days for Palmetto (USC00406950), Tennessee, United States, with 85 years of record.
Key Facts for Palmetto
Palmetto (USC00406950) is a weather station in Tennessee, United States at 35.48 latitude and -86.58 longitude, 235 m (771 ft) above sea level.
The station reports from 1893 to 1977, 85 years of record.
1,464 records set at Palmetto still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Palmetto set a daily record high minimum temperature of 17.8 C (64.0 F) on 30 March 1977.
About the Station
Location: Tennessee, United States, 35.48 latitude, -86.58 longitude.
Elevation: 235 m (771 ft).
Period of record: 1893 to 1977, 85 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 Palmetto. 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 Palmetto, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
25.0 C (77.0 F)
-28.9 C (-20.0 F)
n/a
n/a
Feb
27.2 C (81.0 F)
-27.8 C (-18.0 F)
n/a
n/a
Mar
31.1 C (88.0 F)
-17.2 C (1.0 F)
n/a
n/a
Apr
32.2 C (90.0 F)
-5.6 C (21.9 F)
n/a
n/a
May
35.6 C (96.1 F)
-0.6 C (30.9 F)
n/a
n/a
Jun
40.6 C (105.1 F)
4.4 C (39.9 F)
n/a
n/a
Jul
42.8 C (109.0 F)
8.3 C (46.9 F)
n/a
n/a
Aug
41.7 C (107.1 F)
6.1 C (43.0 F)
n/a
n/a
Sep
41.7 C (107.1 F)
0.0 C (32.0 F)
n/a
n/a
Oct
35.6 C (96.1 F)
-6.1 C (21.0 F)
n/a
n/a
Nov
30.0 C (86.0 F)
-19.4 C (-2.9 F)
n/a
n/a
Dec
25.6 C (78.1 F)
-20.6 C (-5.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Palmetto still stand. 1927 holds the most, with 42.
Standing records at Palmetto by the year they were set
Year set
Standing records
1895
3
1896
32
1897
18
1898
21
1899
30
1900
15
1901
30
1902
29
1903
18
1904
5
1905
18
1906
14
1907
31
1908
21
1909
19
1910
24
1911
31
1912
16
1913
21
1914
25
1915
12
1916
18
1917
27
1918
25
1919
15
1920
16
1921
18
1922
15
1923
12
1924
28
1925
35
1926
17
1927
42
1928
16
1929
22
1930
27
1931
19
1932
19
1933
16
1934
8
1935
13
1936
29
1937
23
1938
12
1939
14
1940
29
1941
21
1942
12
1943
20
1944
13
1945
16
1946
10
1947
10
1948
10
1949
11
1950
29
1951
21
1952
28
1953
8
1954
17
1955
10
1956
9
1957
5
1958
14
1959
4
1960
13
1961
15
1962
19
1963
20
1964
21
1965
9
1966
13
1967
23
1968
11
1969
3
1970
21
1971
7
1972
14
1973
9
1974
18
1975
7
1976
18
1977
7
All-Time Record Progression
3 new records
3 all-time records were set at Palmetto between 28 July 1930 and 28 July 1952. Each dot is a new record.
When Palmetto set new all-time records
Date
Kind
Detail
1930-07-28
Record high maximum temperature
Record high maximum temperature 42.2 C (108.0 F)
1940-01-26
Record low minimum temperature
Record low minimum temperature -28.9 C (-20.0 F)
1952-07-28
Record high maximum temperature
Record high maximum temperature 42.8 C (109.0 F)
Wettest Day of Each Month
Mar: 193.0 mm (7.6 in)
The wettest day on record for each calendar month at Palmetto. The most was 193.0 mm (7.6 in) on 28 March 1902.
Record daily precipitation for each month at Palmetto
Month
Record daily precipitation (mm)
Date
Jan
81.3 mm (3.2 in)
7 January 1946
Feb
154.9 mm (6.1 in)
1 February 1951
Mar
193.0 mm (7.6 in)
28 March 1902
Apr
101.6 mm (4.0 in)
26 April 1965
May
124.5 mm (4.9 in)
23 May 1905
Jun
125.5 mm (4.9 in)
18 June 1939
Jul
109.2 mm (4.3 in)
15 July 1973
Aug
162.6 mm (6.4 in)
29 August 1963
Sep
139.7 mm (5.5 in)
29 September 1944
Oct
106.7 mm (4.2 in)
17 October 1975
Nov
76.7 mm (3.0 in)
3 November 1950
Dec
138.4 mm (5.4 in)
9 December 1966
Period of Record Coverage
1895 to 1977
Complete yearUnder 90 percent of days
83 years of record at Palmetto, 1895 to 1977. 10 years have data for under 90 percent of days and are left out of rankings: 1895, 1903, 1905, 1906, 1930, 1935, 1948, 1956 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 63 complete years at Palmetto, 1896 to 1976. Blue stripes are years cooler than the station's own mean of 15.4 C (59.7 F); red stripes are warmer. The coolest year was 1917, at 13.9 C (57.1 F), and the warmest was 1921, at 16.9 C (62.4 F). The strongest colour marks a difference of 1.5 C (2.7 F).
Annual mean temperature at Palmetto as warming stripes, 1896 to 1976
Year
Annual mean temperature
Difference from the station mean
1896
16.4 C
+1.01 C
1897
16.2 C
+0.82 C
1898
15.7 C
+0.30 C
1899
15.5 C
+0.12 C
1900
15.8 C
+0.39 C
1902
15.5 C
+0.09 C
1908
16.0 C
+0.54 C
1909
15.7 C
+0.26 C
1910
15.0 C
-0.46 C
1911
16.3 C
+0.88 C
1912
14.5 C
-0.95 C
1913
16.0 C
+0.60 C
1914
15.1 C
-0.30 C
1915
14.9 C
-0.47 C
1916
15.1 C
-0.28 C
1917
13.9 C
-1.49 C
1918
15.4 C
-0.04 C
1919
15.8 C
+0.42 C
1920
14.7 C
-0.70 C
1921
16.9 C
+1.50 C
1922
16.3 C
+0.92 C
1923
15.4 C
+0.01 C
1924
14.5 C
-0.95 C
1925
16.2 C
+0.81 C
1926
15.0 C
-0.46 C
1928
14.9 C
-0.54 C
1929
14.9 C
-0.53 C
1931
16.2 C
+0.78 C
1933
15.9 C
+0.50 C
1934
15.3 C
-0.07 C
1938
16.1 C
+0.65 C
1939
15.7 C
+0.24 C
1940
14.1 C
-1.31 C
1941
15.9 C
+0.50 C
1942
15.3 C
-0.12 C
1944
15.6 C
+0.20 C
1945
15.4 C
-0.06 C
1946
15.8 C
+0.43 C
1947
14.8 C
-0.58 C
1949
16.1 C
+0.64 C
1950
15.1 C
-0.28 C
1951
15.6 C
+0.18 C
1952
15.9 C
+0.48 C
1953
16.0 C
+0.56 C
1954
16.2 C
+0.76 C
1955
15.5 C
+0.09 C
1958
14.3 C
-1.10 C
1959
15.6 C
+0.16 C
1960
14.3 C
-1.07 C
1961
14.8 C
-0.58 C
1962
15.4 C
-0.05 C
1964
15.5 C
+0.05 C
1965
15.6 C
+0.19 C
1966
14.7 C
-0.67 C
1967
15.2 C
-0.21 C
1968
14.7 C
-0.73 C
1969
14.5 C
-0.89 C
1971
15.5 C
+0.06 C
1972
15.3 C
-0.11 C
1973
16.0 C
+0.62 C
1974
15.6 C
+0.17 C
1975
15.6 C
+0.23 C
1976
14.3 C
-1.09 C
The fitted trend in annual mean temperature here over 1896 to 1976 is -0.06 C (-0.12 to 0.01) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.10 F (-0.22 to 0.02) per decade. The slope is a straight line fitted to 63 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Palmetto
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.06 C (-0.12 to 0.01) per decade
-0.10 F (-0.22 to 0.02) per decade
1896 to 1976
63
Not clearly different from zero
Mean daily maximum
0.01 C (-0.06 to 0.09) per decade
0.02 F (-0.12 to 0.15) per decade
1896 to 1976
63
Not clearly different from zero
Mean daily minimum
-0.1 C (-0.2 to -0.1) per decade
-0.2 F (-0.4 to -0.1) per decade
1896 to 1976
63
Fall
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
1893 to 1977
Yearly extremes at Palmetto: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
42.8 C (109.0 F)
1952
37.2 C (99.0 F)
83
Coldest night (TNn)
-28.9 C (-20.0 F)
1940
-15.6 C (3.9 F)
83
Wettest day (Rx1day)
193.0 mm (7.6 in)
1902
74.2 mm (2.9 in)
85
Wettest five days (Rx5day)
241.0 mm (9.5 in)
1948
123.3 mm (4.9 in)
85
Longest dry spell (CDD)
40 days
1894
20 days
85
Hottest day (TXx)
The hottest day of the year at Palmetto, 1893 to 1977. The record is 42.8 C (109.0 F) in 1952, marked on the chart; the median year is 37.2 C (99.0 F).
Hottest day (TXx) at Palmetto by year
Year
Hottest day (TXx)
1893
n/a
1894
n/a
1895
25.0 C (77.0 F)
1896
37.2 C (99.0 F)
1897
37.8 C (100.0 F)
1898
38.3 C (100.9 F)
1899
38.9 C (102.0 F)
1900
38.3 C (100.9 F)
1901
38.3 C (100.9 F)
1902
38.9 C (102.0 F)
1903
35.6 C (96.1 F)
1904
35.0 C (95.0 F)
1905
37.2 C (99.0 F)
1906
37.8 C (100.0 F)
1907
36.7 C (98.1 F)
1908
37.8 C (100.0 F)
1909
37.2 C (99.0 F)
1910
36.7 C (98.1 F)
1911
37.8 C (100.0 F)
1912
35.6 C (96.1 F)
1913
39.4 C (102.9 F)
1914
38.9 C (102.0 F)
1915
36.7 C (98.1 F)
1916
33.9 C (93.0 F)
1917
36.1 C (97.0 F)
1918
37.2 C (99.0 F)
1919
36.7 C (98.1 F)
1920
35.0 C (95.0 F)
1921
37.8 C (100.0 F)
1922
36.1 C (97.0 F)
1923
36.1 C (97.0 F)
1924
39.4 C (102.9 F)
1925
41.7 C (107.1 F)
1926
37.8 C (100.0 F)
1927
38.3 C (100.9 F)
1928
35.0 C (95.0 F)
1929
35.0 C (95.0 F)
1930
42.2 C (108.0 F)
1931
38.9 C (102.0 F)
1932
36.7 C (98.1 F)
1933
37.2 C (99.0 F)
1934
37.8 C (100.0 F)
1935
38.9 C (102.0 F)
1936
40.6 C (105.1 F)
1937
37.2 C (99.0 F)
1938
37.2 C (99.0 F)
1939
37.2 C (99.0 F)
1940
37.2 C (99.0 F)
1941
37.2 C (99.0 F)
1942
37.8 C (100.0 F)
1943
39.4 C (102.9 F)
1944
37.2 C (99.0 F)
1945
38.3 C (100.9 F)
1946
35.6 C (96.1 F)
1947
37.8 C (100.0 F)
1948
36.7 C (98.1 F)
1949
33.9 C (93.0 F)
1950
35.0 C (95.0 F)
1951
40.6 C (105.1 F)
1952
42.8 C (109.0 F)
1953
39.4 C (102.9 F)
1954
41.1 C (106.0 F)
1955
37.2 C (99.0 F)
1956
38.3 C (100.9 F)
1957
38.3 C (100.9 F)
1958
35.6 C (96.1 F)
1959
35.0 C (95.0 F)
1960
36.7 C (98.1 F)
1961
34.4 C (93.9 F)
1962
37.8 C (100.0 F)
1963
35.0 C (95.0 F)
1964
37.2 C (99.0 F)
1965
36.7 C (98.1 F)
1966
38.3 C (100.9 F)
1967
34.4 C (93.9 F)
1968
39.4 C (102.9 F)
1969
36.7 C (98.1 F)
1970
36.1 C (97.0 F)
1971
37.2 C (99.0 F)
1972
35.0 C (95.0 F)
1973
36.1 C (97.0 F)
1974
35.0 C (95.0 F)
1975
37.2 C (99.0 F)
1976
35.0 C (95.0 F)
1977
29.4 C (84.9 F)
Coldest night (TNn)
The coldest night of the year at Palmetto, 1893 to 1977. The record is -28.9 C (-20.0 F) in 1940, marked on the chart; the median year is -15.6 C (3.9 F).
Coldest night (TNn) at Palmetto by year
Year
Coldest night (TNn)
1893
n/a
1894
n/a
1895
-8.9 C (16.0 F)
1896
-12.2 C (10.0 F)
1897
-19.4 C (-2.9 F)
1898
-12.2 C (10.0 F)
1899
-27.8 C (-18.0 F)
1900
-16.7 C (1.9 F)
1901
-19.4 C (-2.9 F)
1902
-13.3 C (8.1 F)
1903
-17.8 C (0.0 F)
1904
-11.1 C (12.0 F)
1905
-26.1 C (-15.0 F)
1906
-12.2 C (10.0 F)
1907
-12.8 C (9.0 F)
1908
-11.7 C (10.9 F)
1909
-15.0 C (5.0 F)
1910
-22.2 C (-8.0 F)
1911
-20.0 C (-4.0 F)
1912
-21.1 C (-6.0 F)
1913
-10.6 C (12.9 F)
1914
-18.3 C (-0.9 F)
1915
-8.9 C (16.0 F)
1916
-18.3 C (-0.9 F)
1917
-17.8 C (0.0 F)
1918
-24.4 C (-11.9 F)
1919
-18.3 C (-0.9 F)
1920
-12.2 C (10.0 F)
1921
-6.1 C (21.0 F)
1922
-8.9 C (16.0 F)
1923
-11.1 C (12.0 F)
1924
-18.3 C (-0.9 F)
1925
-16.1 C (3.0 F)
1926
-12.2 C (10.0 F)
1927
-16.7 C (1.9 F)
1928
-17.8 C (0.0 F)
1929
-17.8 C (0.0 F)
1930
-17.8 C (0.0 F)
1931
-12.8 C (9.0 F)
1932
-15.6 C (3.9 F)
1933
-22.8 C (-9.0 F)
1934
-15.0 C (5.0 F)
1935
-15.6 C (3.9 F)
1936
-21.1 C (-6.0 F)
1937
-20.0 C (-4.0 F)
1938
-11.7 C (10.9 F)
1939
-9.4 C (15.1 F)
1940
-28.9 C (-20.0 F)
1941
-9.4 C (15.1 F)
1942
-24.4 C (-11.9 F)
1943
-13.9 C (7.0 F)
1944
-11.1 C (12.0 F)
1945
-12.8 C (9.0 F)
1946
-11.1 C (12.0 F)
1947
-13.3 C (8.1 F)
1948
-19.4 C (-2.9 F)
1949
-12.8 C (9.0 F)
1950
-19.4 C (-2.9 F)
1951
-24.4 C (-11.9 F)
1952
-9.4 C (15.1 F)
1953
-13.3 C (8.1 F)
1954
-11.1 C (12.0 F)
1955
-14.4 C (6.1 F)
1956
-8.9 C (16.0 F)
1957
-13.3 C (8.1 F)
1958
-20.6 C (-5.1 F)
1959
-16.7 C (1.9 F)
1960
-16.7 C (1.9 F)
1961
-15.0 C (5.0 F)
1962
-22.2 C (-8.0 F)
1963
-22.8 C (-9.0 F)
1964
-14.4 C (6.1 F)
1965
-16.7 C (1.9 F)
1966
-28.3 C (-18.9 F)
1967
-15.6 C (3.9 F)
1968
-13.3 C (8.1 F)
1969
-13.9 C (7.0 F)
1970
-20.0 C (-4.0 F)
1971
-18.9 C (-2.0 F)
1972
-18.3 C (-0.9 F)
1973
-16.1 C (3.0 F)
1974
-11.1 C (12.0 F)
1975
-12.8 C (9.0 F)
1976
-16.1 C (3.0 F)
1977
-21.1 C (-6.0 F)
Wettest day (Rx1day)
The wettest day of the year at Palmetto, 1893 to 1977. The record is 193.0 mm (7.6 in) in 1902, marked on the chart; the median year is 74.2 mm (2.9 in).
Wettest day (Rx1day) at Palmetto by year
Year
Wettest day (Rx1day)
1893
52.6 mm (2.1 in)
1894
84.6 mm (3.3 in)
1895
78.0 mm (3.1 in)
1896
74.2 mm (2.9 in)
1897
53.1 mm (2.1 in)
1898
64.8 mm (2.6 in)
1899
62.2 mm (2.4 in)
1900
59.4 mm (2.3 in)
1901
51.3 mm (2.0 in)
1902
193.0 mm (7.6 in)
1903
50.0 mm (2.0 in)
1904
53.3 mm (2.1 in)
1905
124.5 mm (4.9 in)
1906
68.6 mm (2.7 in)
1907
113.8 mm (4.5 in)
1908
57.2 mm (2.3 in)
1909
57.2 mm (2.3 in)
1910
59.7 mm (2.4 in)
1911
53.3 mm (2.1 in)
1912
99.6 mm (3.9 in)
1913
110.5 mm (4.4 in)
1914
58.4 mm (2.3 in)
1915
78.7 mm (3.1 in)
1916
76.2 mm (3.0 in)
1917
78.7 mm (3.1 in)
1918
95.8 mm (3.8 in)
1919
69.9 mm (2.8 in)
1920
82.6 mm (3.3 in)
1921
92.7 mm (3.6 in)
1922
66.0 mm (2.6 in)
1923
59.2 mm (2.3 in)
1924
55.9 mm (2.2 in)
1925
53.3 mm (2.1 in)
1926
76.2 mm (3.0 in)
1927
47.5 mm (1.9 in)
1928
46.2 mm (1.8 in)
1929
57.2 mm (2.3 in)
1930
55.4 mm (2.2 in)
1931
48.8 mm (1.9 in)
1932
49.0 mm (1.9 in)
1933
61.0 mm (2.4 in)
1934
80.0 mm (3.1 in)
1935
74.9 mm (2.9 in)
1936
101.6 mm (4.0 in)
1937
93.7 mm (3.7 in)
1938
72.1 mm (2.8 in)
1939
125.5 mm (4.9 in)
1940
53.3 mm (2.1 in)
1941
63.5 mm (2.5 in)
1942
46.2 mm (1.8 in)
1943
62.7 mm (2.5 in)
1944
139.7 mm (5.5 in)
1945
69.9 mm (2.8 in)
1946
81.3 mm (3.2 in)
1947
80.3 mm (3.2 in)
1948
110.5 mm (4.4 in)
1949
99.1 mm (3.9 in)
1950
79.2 mm (3.1 in)
1951
154.9 mm (6.1 in)
1952
95.8 mm (3.8 in)
1953
81.8 mm (3.2 in)
1954
90.7 mm (3.6 in)
1955
165.1 mm (6.5 in)
1956
95.3 mm (3.8 in)
1957
74.2 mm (2.9 in)
1958
59.7 mm (2.4 in)
1959
81.3 mm (3.2 in)
1960
70.1 mm (2.8 in)
1961
85.9 mm (3.4 in)
1962
105.4 mm (4.1 in)
1963
162.6 mm (6.4 in)
1964
63.5 mm (2.5 in)
1965
101.6 mm (4.0 in)
1966
138.4 mm (5.4 in)
1967
58.4 mm (2.3 in)
1968
57.2 mm (2.3 in)
1969
119.6 mm (4.7 in)
1970
69.9 mm (2.8 in)
1971
59.9 mm (2.4 in)
1972
91.4 mm (3.6 in)
1973
121.2 mm (4.8 in)
1974
63.0 mm (2.5 in)
1975
123.2 mm (4.9 in)
1976
54.4 mm (2.1 in)
1977
67.1 mm (2.6 in)
Wettest five days (Rx5day)
The wettest five days of the year at Palmetto, 1893 to 1977. The record is 241.0 mm (9.5 in) in 1948, marked on the chart; the median year is 123.3 mm (4.9 in).
Wettest five days (Rx5day) at Palmetto by year
Year
Wettest five days (Rx5day)
1893
120.1 mm (4.7 in)
1894
115.1 mm (4.5 in)
1895
90.0 mm (3.5 in)
1896
125.5 mm (4.9 in)
1897
120.2 mm (4.7 in)
1898
126.6 mm (5.0 in)
1899
78.0 mm (3.1 in)
1900
140.6 mm (5.5 in)
1901
117.9 mm (4.6 in)
1902
217.9 mm (8.6 in)
1903
142.0 mm (5.6 in)
1904
115.1 mm (4.5 in)
1905
166.2 mm (6.5 in)
1906
102.6 mm (4.0 in)
1907
113.8 mm (4.5 in)
1908
98.4 mm (3.9 in)
1909
122.0 mm (4.8 in)
1910
84.1 mm (3.3 in)
1911
101.6 mm (4.0 in)
1912
173.7 mm (6.8 in)
1913
110.5 mm (4.4 in)
1914
109.8 mm (4.3 in)
1915
129.5 mm (5.1 in)
1916
164.1 mm (6.5 in)
1917
124.7 mm (4.9 in)
1918
132.1 mm (5.2 in)
1919
124.6 mm (4.9 in)
1920
144.5 mm (5.7 in)
1921
111.2 mm (4.4 in)
1922
123.3 mm (4.9 in)
1923
120.9 mm (4.8 in)
1924
126.7 mm (5.0 in)
1925
117.5 mm (4.6 in)
1926
149.9 mm (5.9 in)
1927
132.3 mm (5.2 in)
1928
70.0 mm (2.8 in)
1929
97.9 mm (3.9 in)
1930
81.3 mm (3.2 in)
1931
85.1 mm (3.4 in)
1932
104.4 mm (4.1 in)
1933
150.1 mm (5.9 in)
1934
117.6 mm (4.6 in)
1935
90.2 mm (3.6 in)
1936
122.4 mm (4.8 in)
1937
126.7 mm (5.0 in)
1938
95.9 mm (3.8 in)
1939
141.5 mm (5.6 in)
1940
92.4 mm (3.6 in)
1941
111.7 mm (4.4 in)
1942
60.9 mm (2.4 in)
1943
81.5 mm (3.2 in)
1944
143.3 mm (5.6 in)
1945
123.2 mm (4.9 in)
1946
154.2 mm (6.1 in)
1947
89.2 mm (3.5 in)
1948
241.0 mm (9.5 in)
1949
170.7 mm (6.7 in)
1950
138.4 mm (5.4 in)
1951
154.9 mm (6.1 in)
1952
126.1 mm (5.0 in)
1953
105.9 mm (4.2 in)
1954
132.6 mm (5.2 in)
1955
206.0 mm (8.1 in)
1956
180.4 mm (7.1 in)
1957
233.7 mm (9.2 in)
1958
141.2 mm (5.6 in)
1959
114.8 mm (4.5 in)
1960
87.9 mm (3.5 in)
1961
149.3 mm (5.9 in)
1962
169.7 mm (6.7 in)
1963
167.9 mm (6.6 in)
1964
118.9 mm (4.7 in)
1965
153.7 mm (6.1 in)
1966
170.2 mm (6.7 in)
1967
75.9 mm (3.0 in)
1968
89.9 mm (3.5 in)
1969
169.7 mm (6.7 in)
1970
169.7 mm (6.7 in)
1971
82.5 mm (3.2 in)
1972
170.2 mm (6.7 in)
1973
239.3 mm (9.4 in)
1974
137.7 mm (5.4 in)
1975
184.3 mm (7.3 in)
1976
81.0 mm (3.2 in)
1977
80.1 mm (3.2 in)
Longest dry spell (CDD)
The longest dry spell of the year at Palmetto, 1893 to 1977. The record is 40 days in 1894, marked on the chart; the median year is 20 days.
Longest dry spell (CDD) at Palmetto by year
Year
Longest dry spell (CDD)
1893
15 days
1894
40 days
1895
21 days
1896
26 days
1897
23 days
1898
16 days
1899
18 days
1900
14 days
1901
20 days
1902
22 days
1903
24 days
1904
22 days
1905
13 days
1906
23 days
1907
15 days
1908
32 days
1909
25 days
1910
25 days
1911
18 days
1912
24 days
1913
31 days
1914
23 days
1915
13 days
1916
19 days
1917
20 days
1918
18 days
1919
21 days
1920
29 days
1921
23 days
1922
14 days
1923
26 days
1924
31 days
1925
25 days
1926
11 days
1927
21 days
1928
32 days
1929
15 days
1930
33 days
1931
21 days
1932
21 days
1933
15 days
1934
16 days
1935
33 days
1936
30 days
1937
13 days
1938
18 days
1939
15 days
1940
24 days
1941
17 days
1942
18 days
1943
27 days
1944
26 days
1945
17 days
1946
17 days
1947
19 days
1948
18 days
1949
15 days
1950
23 days
1951
24 days
1952
29 days
1953
31 days
1954
19 days
1955
16 days
1956
18 days
1957
20 days
1958
20 days
1959
16 days
1960
17 days
1961
28 days
1962
17 days
1963
32 days
1964
20 days
1965
31 days
1966
17 days
1967
20 days
1968
17 days
1969
18 days
1970
13 days
1971
11 days
1972
15 days
1973
16 days
1974
15 days
1975
15 days
1976
13 days
1977
15 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
63 years with a frost
Across 63 years with a frost, the median last spring frost at Palmetto falls on 10 April and the median first autumn frost on 24 October, which leaves a median of 198 days between them.
In 1941 to 1976 the median growing season was 198 days. The two periods have the same number of growing days.
Fitted over all years, the growing season changes by -1.1 days per decade at this station.
Frost dates and growing season at Palmetto
Measure
Median, all years
Earliest period (1896 to 1934)
Recent period (1941 to 1976)
Recent against earliest
Fitted trend
Last spring frost
10 April
9 April
11 April
2 days later
+0.8 days per decade
First autumn frost
24 October
25 October
25 October
no change
-0.3 days per decade
Growing days
198 days
198 days
198 days
no change
-1.1 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
77 years, 1894 to 1976
A day with at least 72.3 mm (2.8 in) of rain is expected about once in 2 years. A day with at least 208.5 mm (8.2 in) of rain is expected about once in 100 years.
Rainfall return levels at Palmetto: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
72.3 mm (2.8 in)
5 years
98.0 mm (3.9 in)
10 years
118.6 mm (4.7 in)
25 years
149.7 mm (5.9 in)
50 years
177.1 mm (7.0 in)
100 years
208.5 mm (8.2 in)
Longer than the 77 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, 77 years of values from 1894 to 1976.
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: 193.0 mm (7.6 in) in 1902; 165.1 mm (6.5 in) in 1955; 162.6 mm (6.4 in) in 1963.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Palmetto, at 1940. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1940 ran 0.2 C (0.4 F) higher than in the years before (likely change).
Suspected changes in the annual mean temperature at Palmetto, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1940
+0.2
+0.4
likely
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.
Download the Data
Data for Palmetto standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Palmetto 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.