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
Record highRecord low2026 daily maximum2026 daily minimum
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
Year with most
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
Complete yearUnder 90 percent of days
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.
Cooler than the station meanWarmer than the station mean
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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.