Millsboro Weather Records (USC00076020)

Record envelope, standing records and threshold days for Millsboro (USC00076020), Delaware, United States, with 62 years of record.

Key Facts for Millsboro

Millsboro (USC00076020) is a weather station in Delaware, United States at 38.58 latitude and -75.32 longitude, 6 m (20 ft) above sea level.
The station reports from 1893 to 1954, 62 years of record.
1,464 records set at Millsboro still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Millsboro set a daily record precipitation of 51.3 mm (2.0 in) on 23 November 1953.

About the Station

Location: Delaware, United States, 38.58 latitude, -75.32 longitude.
Elevation: 6 m (20 ft).
Period of record: 1893 to 1954, 62 years.
Eligible elements: tmax, tmin, prcp.

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 Millsboro. 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 Millsboro, 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)	-27.2 C (-17.0 F)	n/a	n/a
Feb	27.8 C (82.0 F)	-23.3 C (-9.9 F)	n/a	n/a
Mar	32.8 C (91.0 F)	-15.6 C (3.9 F)	n/a	n/a
Apr	37.2 C (99.0 F)	-9.4 C (15.1 F)	n/a	n/a
May	37.8 C (100.0 F)	-3.3 C (26.1 F)	n/a	n/a
Jun	38.9 C (102.0 F)	1.7 C (35.1 F)	n/a	n/a
Jul	43.3 C (109.9 F)	7.8 C (46.0 F)	n/a	n/a
Aug	41.1 C (106.0 F)	5.0 C (41.0 F)	n/a	n/a
Sep	38.9 C (102.0 F)	1.1 C (34.0 F)	n/a	n/a
Oct	35.6 C (96.1 F)	-6.1 C (21.0 F)	n/a	n/a
Nov	29.4 C (84.9 F)	-12.2 C (10.0 F)	n/a	n/a
Dec	24.4 C (75.9 F)	-23.9 C (-11.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Millsboro still stand. 1898 holds the most, with 42.

Standing records at Millsboro by the year they were set
Year set	Standing records
1893	36
1894	17
1895	34
1896	41
1897	13
1898	42
1899	25
1900	37
1901	33
1902	14
1903	22
1904	27
1905	15
1906	27
1907	26
1908	16
1909	26
1910	16
1911	18
1912	23
1913	22
1914	31
1915	30
1916	26
1917	28
1918	30
1919	29
1920	18
1921	24
1922	13
1923	27
1924	20
1925	34
1926	30
1927	30
1928	23
1929	35
1930	37
1931	19
1932	24
1933	21
1934	23
1935	28
1936	18
1937	18
1938	15
1939	19
1940	33
1941	13
1942	21
1943	22
1944	11
1945	22
1946	26
1947	27
1948	25
1949	19
1950	22
1951	14
1952	17
1953	12

All-Time Record Progression

4 new records

4 all-time records were set at Millsboro between 21 July 1930 and 14 August 1953. Each dot is a new record.

When Millsboro set new all-time records
Date	Kind	Detail
1930-07-21	Record high maximum temperature	Record high maximum temperature 43.3 C (109.9 F)
1933-08-21	Record daily precipitation	Record daily precipitation 133.4 mm (5.3 in)
1935-09-06	Record daily precipitation	Record daily precipitation 168.9 mm (6.6 in)
1953-08-14	Record daily precipitation	Record daily precipitation 170.7 mm (6.7 in)

Wettest Day of Each Month

Aug: 170.7 mm (6.7 in)

The wettest day on record for each calendar month at Millsboro. The most was 170.7 mm (6.7 in) on 14 August 1953.

Record daily precipitation for each month at Millsboro
Month	Record daily precipitation (mm)	Date
Jan	87.6 mm (3.4 in)	2 January 1925
Feb	95.3 mm (3.8 in)	4 February 1920
Mar	66.0 mm (2.6 in)	31 March 1903
Apr	73.9 mm (2.9 in)	9 April 1902
May	71.1 mm (2.8 in)	3 May 1934
Jun	70.1 mm (2.8 in)	3 June 1948
Jul	104.1 mm (4.1 in)	13 July 1934
Aug	170.7 mm (6.7 in)	14 August 1953
Sep	168.9 mm (6.6 in)	6 September 1935
Oct	84.3 mm (3.3 in)	6 October 1899
Nov	99.1 mm (3.9 in)	17 November 1935
Dec	84.3 mm (3.3 in)	7 December 1945

Period of Record Coverage

1893 to 1954

62 years of record at Millsboro, 1893 to 1954. 2 years have data for under 90 percent of days and are left out of rankings: 1941, 1954.

Days with data per year at Millsboro
Year	Days with data	Share of year	Complete
1893	329	90%	Yes
1894	364	100%	Yes
1895	364	100%	Yes
1896	365	100%	Yes
1897	354	97%	Yes
1898	362	99%	Yes
1899	363	99%	Yes
1900	364	100%	Yes
1901	365	100%	Yes
1902	360	99%	Yes
1903	363	99%	Yes
1904	365	100%	Yes
1905	365	100%	Yes
1906	364	100%	Yes
1907	365	100%	Yes
1908	366	100%	Yes
1909	364	100%	Yes
1910	365	100%	Yes
1911	365	100%	Yes
1912	364	99%	Yes
1913	365	100%	Yes
1914	365	100%	Yes
1915	364	100%	Yes
1916	365	100%	Yes
1917	364	100%	Yes
1918	365	100%	Yes
1919	364	100%	Yes
1920	366	100%	Yes
1921	364	100%	Yes
1922	364	100%	Yes
1923	365	100%	Yes
1924	364	99%	Yes
1925	361	99%	Yes
1926	365	100%	Yes
1927	364	100%	Yes
1928	365	100%	Yes
1929	364	100%	Yes
1930	365	100%	Yes
1931	346	95%	Yes
1932	365	100%	Yes
1933	356	98%	Yes
1934	361	99%	Yes
1935	365	100%	Yes
1936	337	92%	Yes
1937	362	99%	Yes
1938	364	100%	Yes
1939	364	100%	Yes
1940	366	100%	Yes
1941	269	74%	No
1942	355	97%	Yes
1943	364	100%	Yes
1944	364	99%	Yes
1945	364	100%	Yes
1946	362	99%	Yes
1947	365	100%	Yes
1948	366	100%	Yes
1949	344	94%	Yes
1950	354	97%	Yes
1951	349	96%	Yes
1952	349	95%	Yes
1953	337	92%	Yes
1954	26	7%	No

Latest Records

Latest records at Millsboro
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
23 November 1953	Millsboro, US	daily rain	51.3 mm (2.0 in)	25.1 mm (1.0 in)	44 years	39 of 100 (Notable)
28 October 1953	Millsboro, US	daily rain	32.8 mm (1.3 in)	4.9 mm (0.19 in)	46 years	22 of 100 (Routine)
20 October 1953	Millsboro, US	daily high max (Tie)	28.9 C (84.0 F)	tie	15 years	2 of 100 (Routine)
9 October 1953	Millsboro, US	daily low min	-0.6 C (30.9 F)	0.6 C (1.1 F)	16 years	11 of 100 (Routine)
14 September 1953	Millsboro, US	daily low min	1.7 C (35.1 F)	3.3 C (5.9 F)	42 years	24 of 100 (Routine)
6 September 1953	Millsboro, US	daily high min (Tie)	22.2 C (72.0 F)	tie	54 years	5 of 100 (Routine)
5 September 1953	Millsboro, US	daily high min	22.8 C (73.0 F)	0.6 C (1.1 F)	54 years	23 of 100 (Routine)
2 September 1953	Millsboro, US	daily high max (Tie)	36.7 C (98.1 F)	tie	32 years	3 of 100 (Routine)
31 August 1953	Millsboro, US	daily high max	37.8 C (100.0 F)	1.1 C (2.0 F)	32 years	18 of 100 (Routine)
30 August 1953	Millsboro, US	daily high max	36.7 C (98.1 F)	1.7 C (3.1 F)	32 years	19 of 100 (Routine)
29 August 1953	Millsboro, US	daily high max (Tie)	36.1 C (97.0 F)	tie	27 years	3 of 100 (Routine)
19 August 1953	Millsboro, US	daily low min	10.0 C (50.0 F)	1.1 C (2.0 F)	38 years	19 of 100 (Routine)
14 August 1953	Millsboro, US	all-time rain	170.7 mm (6.7 in)	1.8 mm (0.07 in)	17 years	31 of 100 (Routine)
14 August 1953	Millsboro, US	daily low max	23.9 C (75.0 F)	0.5 C (0.9 F)	51 years	22 of 100 (Routine)
23 July 1953	Millsboro, US	daily rain	59.7 mm (2.4 in)	5.1 mm (0.20 in)	28 years	17 of 100 (Routine)
18 July 1953	Millsboro, US	daily high max (Tie)	37.2 C (99.0 F)	tie	52 years	5 of 100 (Routine)
11 July 1953	Millsboro, US	daily low min (Tie)	11.1 C (52.0 F)	tie	44 years	4 of 100 (Routine)
29 June 1953	Millsboro, US	daily high min	25.0 C (77.0 F)	1.1 C (2.0 F)	53 years	24 of 100 (Routine)
1 June 1953	Millsboro, US	daily low max (Tie)	13.9 C (57.0 F)	tie	46 years	4 of 100 (Routine)
18 May 1953	Millsboro, US	daily high min	21.1 C (70.0 F)	1.7 C (3.1 F)	7 years	11 of 100 (Routine)

Climate Trend

56 complete years, 1894 to 1953

One stripe for each of 56 complete years at Millsboro, 1894 to 1953. Blue stripes are years cooler than the station's own mean of 13.1 C (55.7 F); red stripes are warmer. The coolest year was 1904, at 11.6 C (52.8 F), and the warmest was 1949, at 14.6 C (58.2 F). The strongest colour marks a difference of 1.6 C (2.9 F).

Annual mean temperature at Millsboro as warming stripes, 1894 to 1953
Year	Annual mean temperature	Difference from the station mean
1894	13.2 C	+0.06 C
1895	12.4 C	-0.77 C
1896	13.0 C	-0.13 C
1897	12.9 C	-0.21 C
1898	13.2 C	+0.03 C
1899	12.5 C	-0.60 C
1900	13.2 C	+0.10 C
1901	11.8 C	-1.35 C
1902	12.6 C	-0.56 C
1903	12.6 C	-0.54 C
1904	11.6 C	-1.57 C
1905	12.5 C	-0.67 C
1906	13.7 C	+0.51 C
1907	11.8 C	-1.30 C
1908	12.8 C	-0.35 C
1909	12.8 C	-0.33 C
1910	12.7 C	-0.45 C
1911	13.2 C	+0.05 C
1912	12.7 C	-0.42 C
1913	14.3 C	+1.13 C
1914	12.9 C	-0.23 C
1915	14.1 C	+0.91 C
1916	12.5 C	-0.67 C
1917	11.6 C	-1.57 C
1918	12.9 C	-0.24 C
1919	13.5 C	+0.32 C
1920	12.6 C	-0.54 C
1921	14.2 C	+1.09 C
1922	13.4 C	+0.22 C
1923	12.8 C	-0.34 C
1924	12.4 C	-0.78 C
1925	14.1 C	+0.97 C
1926	12.8 C	-0.39 C
1927	13.4 C	+0.26 C
1928	13.2 C	+0.03 C
1929	13.8 C	+0.67 C
1930	13.8 C	+0.70 C
1932	14.1 C	+0.91 C
1933	14.2 C	+1.07 C
1934	13.2 C	+0.06 C
1935	13.1 C	-0.05 C
1937	13.3 C	+0.20 C
1938	13.9 C	+0.80 C
1939	13.9 C	+0.80 C
1940	11.9 C	-1.25 C
1942	13.5 C	+0.38 C
1943	13.0 C	-0.14 C
1944	13.2 C	+0.01 C
1945	13.5 C	+0.40 C
1946	14.5 C	+1.32 C
1947	13.5 C	+0.34 C
1948	13.3 C	+0.15 C
1949	14.6 C	+1.43 C
1950	13.2 C	+0.10 C
1952	12.9 C	-0.28 C
1953	14.0 C	+0.89 C

The annual mean temperature here has risen by 0.2 C (0.1 to 0.3) per decade over 1894 to 1953. In Fahrenheit: 0.3 F (0.2 to 0.5) per decade. The slope is a straight line fitted to 56 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Millsboro
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	1894 to 1953	56	Rise
Mean daily maximum	0.3 C (0.2 to 0.4) per decade	0.6 F (0.4 to 0.8) per decade	1894 to 1953	56	Rise
Mean daily minimum	0.1 C (-0.1 to 0.2) per decade	0.1 F (-0.1 to 0.3) per decade	1894 to 1953	56	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

1893 to 1954

Yearly extremes at Millsboro: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	43.3 C (109.9 F)	1930	37.2 C (99.0 F)	62
Coldest night (TNn)	-27.2 C (-17.0 F)	1893	-14.4 C (6.1 F)	62
Wettest day (Rx1day)	170.7 mm (6.7 in)	1953	70.3 mm (2.8 in)	62
Wettest five days (Rx5day)	287.0 mm (11.3 in)	1933	99.2 mm (3.9 in)	62
Longest dry spell (CDD)	34 days	1941	18 days	62

Hottest day (TXx)

The hottest day of the year at Millsboro, 1893 to 1954. The record is 43.3 C (109.9 F) in 1930, marked on the chart; the median year is 37.2 C (99.0 F).

Hottest day (TXx) at Millsboro by year
Year	Hottest day (TXx)
1893	36.1 C (97.0 F)
1894	36.1 C (97.0 F)
1895	36.7 C (98.1 F)
1896	37.2 C (99.0 F)
1897	34.4 C (93.9 F)
1898	36.7 C (98.1 F)
1899	37.8 C (100.0 F)
1900	40.0 C (104.0 F)
1901	37.8 C (100.0 F)
1902	38.3 C (100.9 F)
1903	37.2 C (99.0 F)
1904	37.2 C (99.0 F)
1905	37.2 C (99.0 F)
1906	36.7 C (98.1 F)
1907	35.0 C (95.0 F)
1908	37.2 C (99.0 F)
1909	36.7 C (98.1 F)
1910	35.0 C (95.0 F)
1911	38.9 C (102.0 F)
1912	38.9 C (102.0 F)
1913	35.6 C (96.1 F)
1914	37.2 C (99.0 F)
1915	37.2 C (99.0 F)
1916	37.2 C (99.0 F)
1917	37.8 C (100.0 F)
1918	41.1 C (106.0 F)
1919	40.6 C (105.1 F)
1920	35.6 C (96.1 F)
1921	37.8 C (100.0 F)
1922	35.6 C (96.1 F)
1923	37.8 C (100.0 F)
1924	37.8 C (100.0 F)
1925	38.9 C (102.0 F)
1926	38.9 C (102.0 F)
1927	35.6 C (96.1 F)
1928	37.8 C (100.0 F)
1929	38.9 C (102.0 F)
1930	43.3 C (109.9 F)
1931	38.3 C (100.9 F)
1932	36.7 C (98.1 F)
1933	37.2 C (99.0 F)
1934	37.8 C (100.0 F)
1935	35.0 C (95.0 F)
1936	38.9 C (102.0 F)
1937	36.1 C (97.0 F)
1938	36.7 C (98.1 F)
1939	36.1 C (97.0 F)
1940	37.8 C (100.0 F)
1941	37.2 C (99.0 F)
1942	37.8 C (100.0 F)
1943	36.7 C (98.1 F)
1944	36.7 C (98.1 F)
1945	35.0 C (95.0 F)
1946	35.0 C (95.0 F)
1947	37.2 C (99.0 F)
1948	37.8 C (100.0 F)
1949	37.8 C (100.0 F)
1950	35.0 C (95.0 F)
1951	34.4 C (93.9 F)
1952	37.2 C (99.0 F)
1953	37.8 C (100.0 F)
1954	19.4 C (66.9 F)

Coldest night (TNn)

The coldest night of the year at Millsboro, 1893 to 1954. The record is -27.2 C (-17.0 F) in 1893, marked on the chart; the median year is -14.4 C (6.1 F).

Coldest night (TNn) at Millsboro by year
Year	Coldest night (TNn)
1893	-27.2 C (-17.0 F)
1894	-12.8 C (9.0 F)
1895	-18.3 C (-0.9 F)
1896	-14.4 C (6.1 F)
1897	-16.1 C (3.0 F)
1898	-14.4 C (6.1 F)
1899	-23.3 C (-9.9 F)
1900	-15.6 C (3.9 F)
1901	-17.2 C (1.0 F)
1902	-14.4 C (6.1 F)
1903	-14.4 C (6.1 F)
1904	-18.3 C (-0.9 F)
1905	-21.1 C (-6.0 F)
1906	-15.0 C (5.0 F)
1907	-13.9 C (7.0 F)
1908	-13.3 C (8.1 F)
1909	-12.2 C (10.0 F)
1910	-15.0 C (5.0 F)
1911	-14.4 C (6.1 F)
1912	-19.4 C (-2.9 F)
1913	-10.6 C (12.9 F)
1914	-16.1 C (3.0 F)
1915	-8.9 C (16.0 F)
1916	-19.4 C (-2.9 F)
1917	-23.9 C (-11.0 F)
1918	-19.4 C (-2.9 F)
1919	-13.3 C (8.1 F)
1920	-14.4 C (6.1 F)
1921	-13.9 C (7.0 F)
1922	-16.1 C (3.0 F)
1923	-13.3 C (8.1 F)
1924	-16.7 C (1.9 F)
1925	-11.7 C (10.9 F)
1926	-14.4 C (6.1 F)
1927	-14.4 C (6.1 F)
1928	-18.3 C (-0.9 F)
1929	-13.9 C (7.0 F)
1930	-17.8 C (0.0 F)
1931	-9.4 C (15.1 F)
1932	-15.6 C (3.9 F)
1933	-13.9 C (7.0 F)
1934	-18.3 C (-0.9 F)
1935	-16.7 C (1.9 F)
1936	-18.3 C (-0.9 F)
1937	-12.8 C (9.0 F)
1938	-11.1 C (12.0 F)
1939	-12.2 C (10.0 F)
1940	-19.4 C (-2.9 F)
1941	-10.0 C (14.0 F)
1942	-23.9 C (-11.0 F)
1943	-17.8 C (0.0 F)
1944	-11.1 C (12.0 F)
1945	-15.0 C (5.0 F)
1946	-16.1 C (3.0 F)
1947	-13.9 C (7.0 F)
1948	-16.7 C (1.9 F)
1949	-11.1 C (12.0 F)
1950	-12.8 C (9.0 F)
1951	-15.0 C (5.0 F)
1952	-14.4 C (6.1 F)
1953	-12.2 C (10.0 F)
1954	-13.9 C (7.0 F)

Wettest day (Rx1day)

The wettest day of the year at Millsboro, 1893 to 1954. The record is 170.7 mm (6.7 in) in 1953, marked on the chart; the median year is 70.3 mm (2.8 in).

Wettest day (Rx1day) at Millsboro by year
Year	Wettest day (Rx1day)
1893	44.2 mm (1.7 in)
1894	70.1 mm (2.8 in)
1895	41.9 mm (1.6 in)
1896	82.6 mm (3.3 in)
1897	79.0 mm (3.1 in)
1898	51.3 mm (2.0 in)
1899	84.3 mm (3.3 in)
1900	45.2 mm (1.8 in)
1901	50.8 mm (2.0 in)
1902	73.9 mm (2.9 in)
1903	67.1 mm (2.6 in)
1904	66.5 mm (2.6 in)
1905	118.1 mm (4.6 in)
1906	99.1 mm (3.9 in)
1907	52.1 mm (2.1 in)
1908	50.3 mm (2.0 in)
1909	82.6 mm (3.3 in)
1910	73.7 mm (2.9 in)
1911	52.3 mm (2.1 in)
1912	56.9 mm (2.2 in)
1913	39.9 mm (1.6 in)
1914	82.8 mm (3.3 in)
1915	55.9 mm (2.2 in)
1916	50.0 mm (2.0 in)
1917	50.8 mm (2.0 in)
1918	69.9 mm (2.8 in)
1919	101.6 mm (4.0 in)
1920	95.3 mm (3.8 in)
1921	45.7 mm (1.8 in)
1922	76.2 mm (3.0 in)
1923	78.7 mm (3.1 in)
1924	86.4 mm (3.4 in)
1925	87.6 mm (3.4 in)
1926	76.2 mm (3.0 in)
1927	49.3 mm (1.9 in)
1928	81.3 mm (3.2 in)
1929	70.4 mm (2.8 in)
1930	45.5 mm (1.8 in)
1931	110.5 mm (4.4 in)
1932	58.4 mm (2.3 in)
1933	133.4 mm (5.3 in)
1934	132.1 mm (5.2 in)
1935	168.9 mm (6.6 in)
1936	146.1 mm (5.8 in)
1937	58.4 mm (2.3 in)
1938	64.3 mm (2.5 in)
1939	83.8 mm (3.3 in)
1940	162.6 mm (6.4 in)
1941	52.1 mm (2.1 in)
1942	67.6 mm (2.7 in)
1943	63.8 mm (2.5 in)
1944	120.7 mm (4.8 in)
1945	84.3 mm (3.3 in)
1946	50.5 mm (2.0 in)
1947	54.9 mm (2.2 in)
1948	81.0 mm (3.2 in)
1949	99.6 mm (3.9 in)
1950	72.6 mm (2.9 in)
1951	50.0 mm (2.0 in)
1952	61.2 mm (2.4 in)
1953	170.7 mm (6.7 in)
1954	15.5 mm (0.6 in)

Wettest five days (Rx5day)

The wettest five days of the year at Millsboro, 1893 to 1954. The record is 287.0 mm (11.3 in) in 1933, marked on the chart; the median year is 99.2 mm (3.9 in).

Wettest five days (Rx5day) at Millsboro by year
Year	Wettest five days (Rx5day)
1893	70.4 mm (2.8 in)
1894	102.8 mm (4.0 in)
1895	82.9 mm (3.3 in)
1896	113.8 mm (4.5 in)
1897	131.8 mm (5.2 in)
1898	125.5 mm (4.9 in)
1899	89.0 mm (3.5 in)
1900	81.6 mm (3.2 in)
1901	95.3 mm (3.8 in)
1902	99.3 mm (3.9 in)
1903	154.6 mm (6.1 in)
1904	79.3 mm (3.1 in)
1905	168.9 mm (6.6 in)
1906	127.6 mm (5.0 in)
1907	76.7 mm (3.0 in)
1908	83.1 mm (3.3 in)
1909	87.7 mm (3.5 in)
1910	92.4 mm (3.6 in)
1911	82.8 mm (3.3 in)
1912	64.5 mm (2.5 in)
1913	59.5 mm (2.3 in)
1914	109.4 mm (4.3 in)
1915	86.1 mm (3.4 in)
1916	71.1 mm (2.8 in)
1917	91.4 mm (3.6 in)
1918	99.1 mm (3.9 in)
1919	217.2 mm (8.6 in)
1920	157.6 mm (6.2 in)
1921	63.5 mm (2.5 in)
1922	110.7 mm (4.4 in)
1923	110.7 mm (4.4 in)
1924	64.5 mm (2.5 in)
1925	99.5 mm (3.9 in)
1926	121.2 mm (4.8 in)
1927	86.1 mm (3.4 in)
1928	91.9 mm (3.6 in)
1929	112.1 mm (4.4 in)
1930	47.9 mm (1.9 in)
1931	171.4 mm (6.7 in)
1932	98.0 mm (3.9 in)
1933	287.0 mm (11.3 in)
1934	152.4 mm (6.0 in)
1935	250.1 mm (9.8 in)
1936	151.1 mm (5.9 in)
1937	149.3 mm (5.9 in)
1938	192.5 mm (7.6 in)
1939	119.4 mm (4.7 in)
1940	177.8 mm (7.0 in)
1941	89.3 mm (3.5 in)
1942	98.5 mm (3.9 in)
1943	128.3 mm (5.1 in)
1944	158.1 mm (6.2 in)
1945	121.2 mm (4.8 in)
1946	82.3 mm (3.2 in)
1947	72.6 mm (2.9 in)
1948	155.7 mm (6.1 in)
1949	155.0 mm (6.1 in)
1950	72.6 mm (2.9 in)
1951	86.6 mm (3.4 in)
1952	84.3 mm (3.3 in)
1953	206.3 mm (8.1 in)
1954	15.5 mm (0.6 in)

Longest dry spell (CDD)

The longest dry spell of the year at Millsboro, 1893 to 1954. The record is 34 days in 1941, marked on the chart; the median year is 18 days.

Longest dry spell (CDD) at Millsboro by year
Year	Longest dry spell (CDD)
1893	18 days
1894	13 days
1895	18 days
1896	16 days
1897	17 days
1898	15 days
1899	19 days
1900	17 days
1901	28 days
1902	15 days
1903	18 days
1904	14 days
1905	16 days
1906	18 days
1907	13 days
1908	21 days
1909	13 days
1910	22 days
1911	23 days
1912	20 days
1913	15 days
1914	18 days
1915	26 days
1916	20 days
1917	28 days
1918	23 days
1919	19 days
1920	18 days
1921	22 days
1922	26 days
1923	25 days
1924	19 days
1925	14 days
1926	15 days
1927	14 days
1928	14 days
1929	14 days
1930	29 days
1931	20 days
1932	16 days
1933	12 days
1934	19 days
1935	17 days
1936	14 days
1937	13 days
1938	19 days
1939	28 days
1940	14 days
1941	34 days
1942	22 days
1943	17 days
1944	25 days
1945	16 days
1946	14 days
1947	14 days
1948	18 days
1949	22 days
1950	14 days
1951	13 days
1952	17 days
1953	34 days
1954	8 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

56 years with a frost

Across 56 years with a frost, the median last spring frost at Millsboro falls on 22 April and the median first autumn frost on 22 October, which leaves a median of 183 days between them.

Fitted over all years, the growing season changes by -2.6 days per decade at this station.

Frost dates and growing season at Millsboro
Measure	Median, all years	Earliest period	Recent period (1920 to 1953)	Recent against earliest	Fitted trend
Last spring frost	22 April	n/a	25 April	n/a	+1.6 days per decade
First autumn frost	22 October	n/a	19 October	n/a	-1.0 days per decade
Growing days	183 days	n/a	176 days	n/a	-2.6 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

53 years, 1896 to 1953

A day with at least 71.6 mm (2.8 in) of rain is expected about once in 2 years. A day with at least 211.0 mm (8.3 in) of rain is expected about once in 100 years.

Rainfall return levels at Millsboro: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	71.6 mm (2.8 in)
5 years	99.0 mm (3.9 in)
10 years	120.6 mm (4.7 in)
25 years	152.4 mm (6.0 in)
50 years	180.0 mm (7.1 in)
100 years	211.0 mm (8.3 in)	Longer than the 53 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, 53 years of values from 1896 to 1953.

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: 170.7 mm (6.7 in) in 1953; 168.9 mm (6.6 in) in 1935; 162.6 mm (6.4 in) in 1940.

Station Changes

No change in the annual mean temperature of this station was found against its neighbours.

Download the Data

Data for Millsboro standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Millsboro 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).