Palmetto Weather Records (USC00406950)

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

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

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

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.

Days with data per year at Palmetto
Year	Days with data	Share of year	Complete
1895	31	8%	No
1896	365	100%	Yes
1897	365	100%	Yes
1898	364	100%	Yes
1899	364	100%	Yes
1900	365	100%	Yes
1901	343	94%	Yes
1902	364	100%	Yes
1903	311	85%	No
1904	348	95%	Yes
1905	325	89%	No
1906	268	73%	No
1907	331	91%	Yes
1908	364	99%	Yes
1909	356	98%	Yes
1910	363	99%	Yes
1911	364	100%	Yes
1912	365	100%	Yes
1913	365	100%	Yes
1914	365	100%	Yes
1915	363	99%	Yes
1916	362	99%	Yes
1917	364	100%	Yes
1918	365	100%	Yes
1919	365	100%	Yes
1920	366	100%	Yes
1921	362	99%	Yes
1922	364	100%	Yes
1923	365	100%	Yes
1924	364	99%	Yes
1925	363	99%	Yes
1926	362	99%	Yes
1927	352	96%	Yes
1928	366	100%	Yes
1929	363	99%	Yes
1930	313	86%	No
1931	365	100%	Yes
1932	345	94%	Yes
1933	362	99%	Yes
1934	364	100%	Yes
1935	317	87%	No
1936	348	95%	Yes
1937	330	90%	Yes
1938	364	100%	Yes
1939	359	98%	Yes
1940	360	98%	Yes
1941	358	98%	Yes
1942	357	98%	Yes
1943	334	92%	Yes
1944	364	99%	Yes
1945	362	99%	Yes
1946	364	100%	Yes
1947	364	100%	Yes
1948	242	66%	No
1949	365	100%	Yes
1950	365	100%	Yes
1951	365	100%	Yes
1952	365	100%	Yes
1953	365	100%	Yes
1954	365	100%	Yes
1955	365	100%	Yes
1956	317	87%	No
1957	293	80%	No
1958	364	100%	Yes
1959	364	100%	Yes
1960	365	100%	Yes
1961	365	100%	Yes
1962	364	100%	Yes
1963	344	94%	Yes
1964	364	99%	Yes
1965	364	100%	Yes
1966	358	98%	Yes
1967	354	97%	Yes
1968	347	95%	Yes
1969	352	96%	Yes
1970	353	97%	Yes
1971	355	97%	Yes
1972	363	99%	Yes
1973	364	100%	Yes
1974	364	100%	Yes
1975	364	100%	Yes
1976	362	99%	Yes
1977	90	25%	No

Latest Records

Latest records at Palmetto
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
30 March 1977	Palmetto, US	daily high min	17.8 C (64.0 F)	0.6 C (1.1 F)	39 years	19 of 100 (Routine)
30 March 1977	Palmetto, US	daily high max	29.4 C (84.9 F)	1.1 C (2.0 F)	14 years	13 of 100 (Routine)
15 March 1977	Palmetto, US	daily high max (Tie)	26.7 C (80.1 F)	tie	56 years	6 of 100 (Routine)
4 March 1977	Palmetto, US	daily rain	67.1 mm (2.6 in)	29.0 mm (1.1 in)	56 years	41 of 100 (Notable)
26 February 1977	Palmetto, US	daily high max (Tie)	25.6 C (78.1 F)	tie	60 years	6 of 100 (Routine)
25 February 1977	Palmetto, US	daily high max (Tie)	25.0 C (77.0 F)	tie	59 years	6 of 100 (Routine)
7 February 1977	Palmetto, US	daily low min	-12.8 C (9.0 F)	1.1 C (2.0 F)	71 years	30 of 100 (Routine)
6 February 1977	Palmetto, US	daily low min (Tie)	-12.8 C (9.0 F)	tie	70 years	7 of 100 (Routine)
18 January 1977	Palmetto, US	daily low max	-6.7 C (19.9 F)	2.8 C (5.0 F)	29 years	20 of 100 (Routine)
17 January 1977	Palmetto, US	daily low max	-5.6 C (21.9 F)	1.2 C (2.2 F)	29 years	17 of 100 (Routine)
17 January 1977	Palmetto, US	daily low min	-21.1 C (-6.0 F)	4.4 C (7.9 F)	12 years	17 of 100 (Routine)
1 January 1977	Palmetto, US	daily low min	-17.2 C (1.0 F)	1.6 C (2.9 F)	49 years	24 of 100 (Routine)
31 December 1976	Palmetto, US	daily low min	-16.1 C (3.0 F)	5.0 C (9.0 F)	76 years	39 of 100 (Notable)
8 December 1976	Palmetto, US	daily low max	0.0 C (32.0 F)	0.6 C (1.1 F)	26 years	16 of 100 (Routine)
23 November 1976	Palmetto, US	daily low min	-9.4 C (15.1 F)	0.5 C (0.9 F)	39 years	19 of 100 (Routine)
12 November 1976	Palmetto, US	daily snowfall	2.5 cm (1.0 in)	2.5 cm (1.0 in)	76 years	20 of 100 (Routine)
12 November 1976	Palmetto, US	daily low min (Tie)	-6.7 C (19.9 F)	tie	35 years	4 of 100 (Routine)
2 November 1976	Palmetto, US	daily low min (Tie)	-3.9 C (25.0 F)	tie	59 years	6 of 100 (Routine)
29 October 1976	Palmetto, US	daily low min (Tie)	-4.4 C (24.1 F)	tie	24 years	3 of 100 (Routine)
20 October 1976	Palmetto, US	daily rain	18.0 mm (0.7 in)	3.3 mm (0.13 in)	71 years	20 of 100 (Routine)

Climate Trend

63 complete years, 1896 to 1976

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 2026-10-17 (17 October 2026). Records are computed by this site and are not official.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).