Somerset Main Street Weather Records (USC00368249)
Record envelope, standing records and threshold days for Somerset Main Street (USC00368249), Pennsylvania, United States, with 65 years of record.
Key Facts for Somerset Main Street
Somerset Main Street (USC00368249) is a weather station in Pennsylvania, United States at 40.02 latitude and -79.08 longitude, 656 m (2,152 ft) above sea level.
The station reports from 1894 to 1958, 65 years of record.
1,464 records set at Somerset Main Street still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Somerset Main Street set a daily record low minimum temperature of -17.8 C (0.0 F) on 30 November 1958.
About the Station
Location: Pennsylvania, United States, 40.02 latitude, -79.08 longitude.
Elevation: 656 m (2,152 ft).
Period of record: 1894 to 1958, 65 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 Somerset Main Street. 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 Somerset Main Street, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
23.9 C (75.0 F)
-33.3 C (-27.9 F)
n/a
n/a
Feb
23.3 C (73.9 F)
-33.9 C (-29.0 F)
n/a
n/a
Mar
29.4 C (84.9 F)
-24.4 C (-11.9 F)
n/a
n/a
Apr
32.2 C (90.0 F)
-19.4 C (-2.9 F)
n/a
n/a
May
33.9 C (93.0 F)
-8.9 C (16.0 F)
n/a
n/a
Jun
37.2 C (99.0 F)
-6.7 C (19.9 F)
n/a
n/a
Jul
37.8 C (100.0 F)
0.6 C (33.1 F)
n/a
n/a
Aug
39.4 C (102.9 F)
-1.7 C (28.9 F)
n/a
n/a
Sep
36.7 C (98.1 F)
-5.6 C (21.9 F)
n/a
n/a
Oct
33.3 C (91.9 F)
-12.8 C (9.0 F)
n/a
n/a
Nov
25.6 C (78.1 F)
-26.1 C (-15.0 F)
n/a
n/a
Dec
22.2 C (72.0 F)
-31.7 C (-25.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Somerset Main Street still stand. 1927 holds the most, with 46.
Standing records at Somerset Main Street by the year they were set
Year set
Standing records
1894
41
1895
40
1896
30
1897
13
1898
25
1899
29
1900
32
1901
20
1902
13
1903
26
1904
16
1905
22
1906
19
1907
21
1908
27
1909
20
1910
20
1911
35
1912
16
1913
25
1914
37
1915
13
1916
23
1917
26
1918
27
1919
17
1920
11
1921
22
1922
19
1923
21
1924
19
1925
40
1926
20
1927
46
1928
18
1929
16
1930
42
1931
21
1932
38
1933
24
1934
27
1935
25
1936
37
1937
23
1938
26
1939
13
1940
24
1941
16
1942
16
1943
27
1944
12
1945
17
1946
17
1947
21
1948
18
1949
15
1950
27
1951
20
1952
18
1953
14
1954
15
1955
15
1956
16
1957
9
1958
6
All-Time Record Progression
2 new records
2 all-time records were set at Somerset Main Street between 10 August 1926 and 28 February 1934. Each dot is a new record.
When Somerset Main Street set new all-time records
Date
Kind
Detail
1926-08-10
Record high maximum temperature
Record high maximum temperature 39.4 C (102.9 F)
1934-02-28
Record low minimum temperature
Record low minimum temperature -33.9 C (-29.0 F)
Wettest Day of Each Month
Apr: 151.1 mm (5.9 in)
The wettest day on record for each calendar month at Somerset Main Street. The most was 151.1 mm (5.9 in) on 29 April 1894.
Record daily precipitation for each month at Somerset Main Street
Month
Record daily precipitation (mm)
Date
Jan
53.3 mm (2.1 in)
10 January 1915
Feb
47.0 mm (1.9 in)
16 February 1914
Mar
90.2 mm (3.6 in)
17 March 1936
Apr
151.1 mm (5.9 in)
29 April 1894
May
97.8 mm (3.9 in)
18 May 1894
Jun
71.1 mm (2.8 in)
10 June 1930
Jul
91.4 mm (3.6 in)
13 July 1934
Aug
113.0 mm (4.4 in)
10 August 1905
Sep
82.6 mm (3.3 in)
15 September 1911
Oct
100.3 mm (3.9 in)
15 October 1954
Nov
76.2 mm (3.0 in)
17 November 1920
Dec
57.9 mm (2.3 in)
28 December 1923
Period of Record Coverage
1894 to 1958
Complete yearUnder 90 percent of days
65 years of record at Somerset Main Street, 1894 to 1958. 8 years have data for under 90 percent of days and are left out of rankings: 1894, 1901, 1919, 1924, 1925, 1926, 1929, 1958.
Cooler than the station meanWarmer than the station mean
One stripe for each of 56 complete years at Somerset Main Street, 1895 to 1957. Blue stripes are years cooler than the station's own mean of 8.7 C (47.7 F); red stripes are warmer. The coolest year was 1917, at 7.0 C (44.6 F), and the warmest was 1921, at 11.0 C (51.7 F). The strongest colour marks a difference of 2.3 C (4.1 F).
Annual mean temperature at Somerset Main Street as warming stripes, 1895 to 1957
Year
Annual mean temperature
Difference from the station mean
1895
8.4 C
-0.38 C
1896
9.0 C
+0.25 C
1897
8.6 C
-0.11 C
1898
9.1 C
+0.32 C
1899
8.6 C
-0.15 C
1900
8.8 C
+0.07 C
1902
8.2 C
-0.53 C
1903
8.6 C
-0.18 C
1904
7.5 C
-1.26 C
1905
7.9 C
-0.87 C
1906
8.6 C
-0.12 C
1907
7.8 C
-0.91 C
1908
9.4 C
+0.62 C
1909
9.2 C
+0.41 C
1910
9.0 C
+0.25 C
1911
9.7 C
+0.91 C
1912
8.2 C
-0.57 C
1913
9.6 C
+0.88 C
1914
8.4 C
-0.33 C
1915
8.4 C
-0.34 C
1916
8.4 C
-0.31 C
1917
7.0 C
-1.76 C
1920
8.3 C
-0.43 C
1921
11.0 C
+2.21 C
1922
10.1 C
+1.31 C
1923
9.1 C
+0.35 C
1927
9.0 C
+0.26 C
1928
8.6 C
-0.15 C
1930
8.2 C
-0.55 C
1931
9.5 C
+0.77 C
1932
8.9 C
+0.11 C
1933
9.0 C
+0.27 C
1934
8.3 C
-0.44 C
1935
8.1 C
-0.63 C
1936
7.9 C
-0.86 C
1937
7.6 C
-1.18 C
1938
8.4 C
-0.32 C
1939
8.9 C
+0.18 C
1940
7.1 C
-1.64 C
1941
8.3 C
-0.43 C
1942
8.7 C
-0.10 C
1943
8.6 C
-0.16 C
1944
9.0 C
+0.21 C
1945
8.9 C
+0.10 C
1946
9.4 C
+0.66 C
1947
8.3 C
-0.45 C
1948
9.0 C
+0.22 C
1949
10.0 C
+1.23 C
1950
8.5 C
-0.21 C
1951
8.8 C
+0.05 C
1952
9.2 C
+0.43 C
1953
9.7 C
+0.98 C
1954
9.2 C
+0.44 C
1955
9.1 C
+0.38 C
1956
9.3 C
+0.54 C
1957
9.6 C
+0.83 C
The fitted trend in annual mean temperature here over 1895 to 1957 is 0.07 C (-0.03 to 0.17) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.1 to 0.3) 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 Somerset Main Street
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.07 C (-0.03 to 0.17) per decade
0.1 F (-0.1 to 0.3) per decade
1895 to 1957
56
Not clearly different from zero
Mean daily maximum
0.10 C (-0.02 to 0.22) per decade
0.17 F (-0.04 to 0.39) per decade
1895 to 1957
56
Not clearly different from zero
Mean daily minimum
0.04 C (-0.07 to 0.15) per decade
0.1 F (-0.1 to 0.3) per decade
1895 to 1957
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
1894 to 1958
Yearly extremes at Somerset Main Street: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
39.4 C (102.9 F)
1926
33.9 C (93.0 F)
65
Coldest night (TNn)
-33.9 C (-29.0 F)
1934
-25.0 C (-13.0 F)
65
Wettest day (Rx1day)
151.1 mm (5.9 in)
1894
52.6 mm (2.1 in)
65
Wettest five days (Rx5day)
227.4 mm (9.0 in)
1894
87.9 mm (3.5 in)
65
Longest dry spell (CDD)
34 days
1953
14 days
65
Hottest day (TXx)
The hottest day of the year at Somerset Main Street, 1894 to 1958. The record is 39.4 C (102.9 F) in 1926, marked on the chart; the median year is 33.9 C (93.0 F).
Hottest day (TXx) at Somerset Main Street by year
Year
Hottest day (TXx)
1894
36.1 C (97.0 F)
1895
36.7 C (98.1 F)
1896
34.4 C (93.9 F)
1897
35.0 C (95.0 F)
1898
35.6 C (96.1 F)
1899
33.9 C (93.0 F)
1900
35.6 C (96.1 F)
1901
37.2 C (99.0 F)
1902
32.2 C (90.0 F)
1903
31.7 C (89.1 F)
1904
31.7 C (89.1 F)
1905
31.7 C (89.1 F)
1906
31.7 C (89.1 F)
1907
30.6 C (87.1 F)
1908
35.6 C (96.1 F)
1909
35.0 C (95.0 F)
1910
34.4 C (93.9 F)
1911
36.1 C (97.0 F)
1912
32.8 C (91.0 F)
1913
35.0 C (95.0 F)
1914
36.1 C (97.0 F)
1915
33.9 C (93.0 F)
1916
34.4 C (93.9 F)
1917
34.4 C (93.9 F)
1918
38.9 C (102.0 F)
1919
37.8 C (100.0 F)
1920
30.0 C (86.0 F)
1921
34.4 C (93.9 F)
1922
36.7 C (98.1 F)
1923
34.4 C (93.9 F)
1924
35.0 C (95.0 F)
1925
37.2 C (99.0 F)
1926
39.4 C (102.9 F)
1927
31.7 C (89.1 F)
1928
31.7 C (89.1 F)
1929
31.7 C (89.1 F)
1930
35.0 C (95.0 F)
1931
34.4 C (93.9 F)
1932
33.9 C (93.0 F)
1933
35.0 C (95.0 F)
1934
35.0 C (95.0 F)
1935
31.7 C (89.1 F)
1936
37.2 C (99.0 F)
1937
30.6 C (87.1 F)
1938
30.6 C (87.1 F)
1939
32.2 C (90.0 F)
1940
32.2 C (90.0 F)
1941
33.9 C (93.0 F)
1942
31.7 C (89.1 F)
1943
32.8 C (91.0 F)
1944
34.4 C (93.9 F)
1945
31.7 C (89.1 F)
1946
31.7 C (89.1 F)
1947
32.8 C (91.0 F)
1948
36.1 C (97.0 F)
1949
33.3 C (91.9 F)
1950
32.2 C (90.0 F)
1951
32.2 C (90.0 F)
1952
33.9 C (93.0 F)
1953
35.6 C (96.1 F)
1954
34.4 C (93.9 F)
1955
33.3 C (91.9 F)
1956
32.2 C (90.0 F)
1957
32.2 C (90.0 F)
1958
30.0 C (86.0 F)
Coldest night (TNn)
The coldest night of the year at Somerset Main Street, 1894 to 1958. The record is -33.9 C (-29.0 F) in 1934, marked on the chart; the median year is -25.0 C (-13.0 F).
Coldest night (TNn) at Somerset Main Street by year
Year
Coldest night (TNn)
1894
-25.0 C (-13.0 F)
1895
-26.7 C (-16.1 F)
1896
-23.9 C (-11.0 F)
1897
-24.4 C (-11.9 F)
1898
-22.2 C (-8.0 F)
1899
-31.1 C (-24.0 F)
1900
-25.6 C (-14.1 F)
1901
-24.4 C (-11.9 F)
1902
-26.7 C (-16.1 F)
1903
-24.4 C (-11.9 F)
1904
-28.9 C (-20.0 F)
1905
-27.8 C (-18.0 F)
1906
-22.2 C (-8.0 F)
1907
-27.8 C (-18.0 F)
1908
-25.0 C (-13.0 F)
1909
-20.6 C (-5.1 F)
1910
-23.3 C (-9.9 F)
1911
-18.9 C (-2.0 F)
1912
-31.7 C (-25.1 F)
1913
-18.3 C (-0.9 F)
1914
-28.9 C (-20.0 F)
1915
-20.0 C (-4.0 F)
1916
-25.6 C (-14.1 F)
1917
-28.9 C (-20.0 F)
1918
-28.9 C (-20.0 F)
1919
-24.4 C (-11.9 F)
1920
-20.6 C (-5.1 F)
1921
-20.6 C (-5.1 F)
1922
-23.3 C (-9.9 F)
1923
-20.0 C (-4.0 F)
1924
-23.3 C (-9.9 F)
1925
-26.7 C (-16.1 F)
1926
-26.7 C (-16.1 F)
1927
-23.3 C (-9.9 F)
1928
-21.7 C (-7.1 F)
1929
-23.9 C (-11.0 F)
1930
-26.1 C (-15.0 F)
1931
-20.6 C (-5.1 F)
1932
-24.4 C (-11.9 F)
1933
-26.7 C (-16.1 F)
1934
-33.9 C (-29.0 F)
1935
-28.3 C (-18.9 F)
1936
-33.3 C (-27.9 F)
1937
-25.6 C (-14.1 F)
1938
-25.0 C (-13.0 F)
1939
-26.7 C (-16.1 F)
1940
-26.7 C (-16.1 F)
1941
-23.3 C (-9.9 F)
1942
-33.3 C (-27.9 F)
1943
-27.8 C (-18.0 F)
1944
-28.9 C (-20.0 F)
1945
-26.1 C (-15.0 F)
1946
-27.8 C (-18.0 F)
1947
-22.2 C (-8.0 F)
1948
-31.1 C (-24.0 F)
1949
-21.1 C (-6.0 F)
1950
-28.9 C (-20.0 F)
1951
-27.8 C (-18.0 F)
1952
-18.9 C (-2.0 F)
1953
-15.0 C (5.0 F)
1954
-25.6 C (-14.1 F)
1955
-28.3 C (-18.9 F)
1956
-18.3 C (-0.9 F)
1957
-23.3 C (-9.9 F)
1958
-19.4 C (-2.9 F)
Wettest day (Rx1day)
The wettest day of the year at Somerset Main Street, 1894 to 1958. The record is 151.1 mm (5.9 in) in 1894, marked on the chart; the median year is 52.6 mm (2.1 in).
Wettest day (Rx1day) at Somerset Main Street by year
Year
Wettest day (Rx1day)
1894
151.1 mm (5.9 in)
1895
33.0 mm (1.3 in)
1896
78.7 mm (3.1 in)
1897
47.0 mm (1.9 in)
1898
38.1 mm (1.5 in)
1899
69.3 mm (2.7 in)
1900
58.4 mm (2.3 in)
1901
44.5 mm (1.8 in)
1902
80.0 mm (3.1 in)
1903
47.0 mm (1.9 in)
1904
53.3 mm (2.1 in)
1905
113.0 mm (4.4 in)
1906
78.7 mm (3.1 in)
1907
50.0 mm (2.0 in)
1908
50.0 mm (2.0 in)
1909
47.0 mm (1.9 in)
1910
59.7 mm (2.4 in)
1911
82.6 mm (3.3 in)
1912
67.3 mm (2.6 in)
1913
78.7 mm (3.1 in)
1914
50.8 mm (2.0 in)
1915
63.5 mm (2.5 in)
1916
68.6 mm (2.7 in)
1917
50.8 mm (2.0 in)
1918
38.1 mm (1.5 in)
1919
71.1 mm (2.8 in)
1920
76.2 mm (3.0 in)
1921
57.4 mm (2.3 in)
1922
53.3 mm (2.1 in)
1923
63.5 mm (2.5 in)
1924
50.8 mm (2.0 in)
1925
69.9 mm (2.8 in)
1926
50.8 mm (2.0 in)
1927
52.1 mm (2.1 in)
1928
103.6 mm (4.1 in)
1929
31.8 mm (1.3 in)
1930
71.1 mm (2.8 in)
1931
41.1 mm (1.6 in)
1932
32.5 mm (1.3 in)
1933
38.6 mm (1.5 in)
1934
91.4 mm (3.6 in)
1935
47.8 mm (1.9 in)
1936
90.2 mm (3.6 in)
1937
75.7 mm (3.0 in)
1938
34.3 mm (1.4 in)
1939
37.8 mm (1.5 in)
1940
41.9 mm (1.6 in)
1941
67.3 mm (2.6 in)
1942
50.8 mm (2.0 in)
1943
43.9 mm (1.7 in)
1944
53.8 mm (2.1 in)
1945
53.8 mm (2.1 in)
1946
60.7 mm (2.4 in)
1947
63.8 mm (2.5 in)
1948
45.0 mm (1.8 in)
1949
48.5 mm (1.9 in)
1950
38.1 mm (1.5 in)
1951
47.5 mm (1.9 in)
1952
47.2 mm (1.9 in)
1953
52.6 mm (2.1 in)
1954
100.3 mm (3.9 in)
1955
65.0 mm (2.6 in)
1956
50.8 mm (2.0 in)
1957
41.9 mm (1.6 in)
1958
44.5 mm (1.8 in)
Wettest five days (Rx5day)
The wettest five days of the year at Somerset Main Street, 1894 to 1958. The record is 227.4 mm (9.0 in) in 1894, marked on the chart; the median year is 87.9 mm (3.5 in).
Wettest five days (Rx5day) at Somerset Main Street by year
Year
Wettest five days (Rx5day)
1894
227.4 mm (9.0 in)
1895
67.5 mm (2.7 in)
1896
91.5 mm (3.6 in)
1897
67.9 mm (2.7 in)
1898
67.4 mm (2.7 in)
1899
117.7 mm (4.6 in)
1900
104.2 mm (4.1 in)
1901
82.7 mm (3.3 in)
1902
103.9 mm (4.1 in)
1903
68.7 mm (2.7 in)
1904
56.5 mm (2.2 in)
1905
137.4 mm (5.4 in)
1906
127.2 mm (5.0 in)
1907
113.6 mm (4.5 in)
1908
86.3 mm (3.4 in)
1909
91.7 mm (3.6 in)
1910
97.8 mm (3.9 in)
1911
99.4 mm (3.9 in)
1912
114.1 mm (4.5 in)
1913
69.1 mm (2.7 in)
1914
79.8 mm (3.1 in)
1915
104.4 mm (4.1 in)
1916
80.1 mm (3.2 in)
1917
107.9 mm (4.2 in)
1918
108.2 mm (4.3 in)
1919
145.2 mm (5.7 in)
1920
115.8 mm (4.6 in)
1921
123.2 mm (4.9 in)
1922
67.6 mm (2.7 in)
1923
109.0 mm (4.3 in)
1924
85.9 mm (3.4 in)
1925
80.7 mm (3.2 in)
1926
105.4 mm (4.1 in)
1927
93.8 mm (3.7 in)
1928
126.4 mm (5.0 in)
1929
54.6 mm (2.1 in)
1930
76.6 mm (3.0 in)
1931
66.5 mm (2.6 in)
1932
59.5 mm (2.3 in)
1933
75.7 mm (3.0 in)
1934
132.3 mm (5.2 in)
1935
74.7 mm (2.9 in)
1936
141.5 mm (5.6 in)
1937
115.3 mm (4.5 in)
1938
64.5 mm (2.5 in)
1939
76.9 mm (3.0 in)
1940
64.8 mm (2.6 in)
1941
133.6 mm (5.3 in)
1942
76.6 mm (3.0 in)
1943
96.6 mm (3.8 in)
1944
78.7 mm (3.1 in)
1945
75.4 mm (3.0 in)
1946
66.6 mm (2.6 in)
1947
120.2 mm (4.7 in)
1948
111.2 mm (4.4 in)
1949
65.6 mm (2.6 in)
1950
62.5 mm (2.5 in)
1951
101.9 mm (4.0 in)
1952
79.3 mm (3.1 in)
1953
77.7 mm (3.1 in)
1954
118.1 mm (4.6 in)
1955
87.9 mm (3.5 in)
1956
73.1 mm (2.9 in)
1957
55.7 mm (2.2 in)
1958
108.6 mm (4.3 in)
Longest dry spell (CDD)
The longest dry spell of the year at Somerset Main Street, 1894 to 1958. The record is 34 days in 1953, marked on the chart; the median year is 14 days.
Longest dry spell (CDD) at Somerset Main Street by year
Year
Longest dry spell (CDD)
1894
19 days
1895
29 days
1896
13 days
1897
26 days
1898
14 days
1899
19 days
1900
29 days
1901
24 days
1902
15 days
1903
18 days
1904
14 days
1905
19 days
1906
16 days
1907
8 days
1908
25 days
1909
18 days
1910
25 days
1911
9 days
1912
12 days
1913
14 days
1914
15 days
1915
12 days
1916
17 days
1917
18 days
1918
12 days
1919
15 days
1920
25 days
1921
13 days
1922
24 days
1923
19 days
1924
26 days
1925
10 days
1926
8 days
1927
13 days
1928
13 days
1929
9 days
1930
19 days
1931
10 days
1932
28 days
1933
11 days
1934
19 days
1935
12 days
1936
12 days
1937
13 days
1938
12 days
1939
14 days
1940
14 days
1941
19 days
1942
17 days
1943
14 days
1944
16 days
1945
10 days
1946
12 days
1947
17 days
1948
11 days
1949
14 days
1950
13 days
1951
16 days
1952
17 days
1953
34 days
1954
13 days
1955
11 days
1956
14 days
1957
21 days
1958
11 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 Somerset Main Street falls on 22 May and the median first autumn frost on 24 September, which leaves a median of 125 days between them.
Fitted over all years, the growing season changes by -1.2 days per decade at this station.
Frost dates and growing season at Somerset Main Street
Measure
Median, all years
Earliest period
Recent period (1927 to 1957)
Recent against earliest
Fitted trend
Last spring frost
22 May
n/a
25 May
n/a
+0.7 days per decade
First autumn frost
24 September
n/a
24 September
n/a
-0.6 days per decade
Growing days
125 days
n/a
122 days
n/a
-1.2 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
57 years, 1895 to 1957
A day with at least 54.2 mm (2.1 in) of rain is expected about once in 2 years. A day with at least 125.4 mm (4.9 in) of rain is expected about once in 100 years.
Rainfall return levels at Somerset Main Street: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
54.2 mm (2.1 in)
5 years
70.7 mm (2.8 in)
10 years
82.6 mm (3.3 in)
25 years
98.8 mm (3.9 in)
50 years
111.7 mm (4.4 in)
100 years
125.4 mm (4.9 in)
Longer than the 57 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, 57 years of values from 1895 to 1957.
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: 113.0 mm (4.4 in) in 1905; 103.6 mm (4.1 in) in 1928; 100.3 mm (3.9 in) in 1954.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Somerset Main Street, at 1930. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1930 ran 0.3 C (0.5 F) lower than in the years before (possible change).
Suspected changes in the annual mean temperature at Somerset Main Street, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1930
-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.
Download the Data
Data for Somerset Main Street standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Somerset Main Street 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.