Record envelope, standing records and threshold days for Somerville 4 NW (USC00288194), New Jersey, United States, with 129 years of record.
Key Facts for Somerville 4 NW
Somerville 4 NW (USC00288194) is a weather station in New Jersey, United States at 40.62 latitude and -74.65 longitude, 41 m (134 ft) above sea level.
The station reports from 1878 to 2006, 129 years of record.
1,464 records set at Somerville 4 NW still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Somerville 4 NW set a daily record precipitation of 35.6 mm (1.4 in) on 23 April 2006.
About the Station
Location: New Jersey, United States, 40.62 latitude, -74.65 longitude.
Elevation: 41 m (134 ft).
Period of record: 1878 to 2006, 129 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 Somerville 4 NW. 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 Somerville 4 NW, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
23.3 C (73.9 F)
-28.9 C (-20.0 F)
n/a
n/a
Feb
24.4 C (75.9 F)
-26.7 C (-16.1 F)
n/a
n/a
Mar
30.0 C (86.0 F)
-20.0 C (-4.0 F)
n/a
n/a
Apr
35.0 C (95.0 F)
-11.7 C (10.9 F)
n/a
n/a
May
37.2 C (99.0 F)
-3.3 C (26.1 F)
n/a
n/a
Jun
39.4 C (102.9 F)
1.1 C (34.0 F)
n/a
n/a
Jul
41.7 C (107.1 F)
5.0 C (41.0 F)
n/a
n/a
Aug
42.2 C (108.0 F)
3.3 C (37.9 F)
n/a
n/a
Sep
42.8 C (109.0 F)
-1.7 C (28.9 F)
n/a
n/a
Oct
35.0 C (95.0 F)
-6.7 C (19.9 F)
n/a
n/a
Nov
28.9 C (84.0 F)
-15.0 C (5.0 F)
n/a
n/a
Dec
23.9 C (75.0 F)
-27.8 C (-18.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Somerville 4 NW still stand. 1885 holds the most, with 38.
Standing records at Somerville 4 NW by the year they were set
Year set
Standing records
1883
30
1884
35
1885
38
1891
7
1892
5
1893
13
1894
16
1895
31
1896
38
1897
13
1898
18
1899
22
1900
18
1901
13
1902
9
1903
17
1904
19
1905
8
1906
10
1907
13
1908
15
1909
11
1910
9
1911
13
1912
12
1913
11
1914
16
1915
8
1916
18
1917
23
1918
26
1919
9
1920
9
1921
12
1922
5
1923
15
1924
16
1925
14
1926
17
1927
13
1928
11
1929
16
1930
24
1931
13
1932
14
1933
9
1934
4
1935
12
1936
10
1937
7
1938
12
1939
8
1940
12
1941
5
1942
12
1943
11
1944
10
1945
20
1946
9
1947
16
1948
14
1949
23
1950
16
1951
11
1952
9
1953
14
1954
12
1955
13
1956
14
1957
14
1958
2
1959
12
1960
12
1961
8
1962
9
1963
11
1964
15
1965
7
1966
9
1967
11
1968
1
1969
4
1970
4
1971
7
1972
10
1973
3
1974
14
1975
6
1976
21
1977
15
1978
8
1979
20
1980
8
1981
9
1982
19
1983
6
1984
13
1985
7
1986
5
1987
5
1988
9
1989
13
1990
21
1991
12
1992
6
1993
6
1994
7
1995
5
1996
10
1997
4
1998
5
1999
7
2000
15
2001
6
2002
15
2003
7
2004
4
2005
8
2006
3
All-Time Record Progression
7 new records
7 all-time records were set at Somerville 4 NW between 3 April 1915 and 8 January 1996. Each dot is a new record.
When Somerville 4 NW set new all-time records
Date
Kind
Detail
1915-04-03
Record daily snowfall
Record daily snowfall 43.2 cm (17.0 in)
1921-02-20
Record daily snowfall
Record daily snowfall 55.9 cm (22.0 in)
1956-03-19
Record snow depth
Record snow depth 53.3 cm (21.0 in)
1971-08-28
Record daily precipitation
Record daily precipitation 225.8 mm (8.9 in)
1982-01-18
Record low maximum temperature
Record low maximum temperature -17.8 C (0.0 F)
1983-02-12
Record snow depth
Record snow depth 58.4 cm (23.0 in)
1996-01-08
Record snow depth
Record snow depth 61.0 cm (24.0 in)
Wettest Day of Each Month
Aug: 225.8 mm (8.9 in)
The wettest day on record for each calendar month at Somerville 4 NW. The most was 225.8 mm (8.9 in) on 28 August 1971.
Record daily precipitation for each month at Somerville 4 NW
Month
Record daily precipitation (mm)
Date
Jan
62.0 mm (2.4 in)
4 January 1999
Feb
78.7 mm (3.1 in)
6 February 1896
Mar
67.8 mm (2.7 in)
25 March 1969
Apr
69.9 mm (2.8 in)
17 April 1986
May
115.6 mm (4.6 in)
19 May 1900
Jun
109.2 mm (4.3 in)
12 June 1903
Jul
115.3 mm (4.5 in)
28 July 1951
Aug
225.8 mm (8.9 in)
28 August 1971
Sep
205.7 mm (8.1 in)
17 September 1999
Oct
135.1 mm (5.3 in)
9 October 2005
Nov
84.6 mm (3.3 in)
25 November 1950
Dec
74.7 mm (2.9 in)
10 December 1878
Period of Record Coverage
1883 to 2006
Complete yearUnder 90 percent of days
122 years of record at Somerville 4 NW, 1883 to 2006. 17 years have data for under 90 percent of days and are left out of rankings: 1883, 1887, 1888, 1889, 1891, 1892, 1921, 1922 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 98 complete years at Somerville 4 NW, 1884 to 2005. Blue stripes are years cooler than the station's own mean of 10.9 C (51.6 F); red stripes are warmer. The coolest year was 1904, at 9.1 C (48.4 F), and the warmest was 1949, at 12.8 C (55.0 F). The strongest colour marks a difference of 2.0 C (3.6 F).
Annual mean temperature at Somerville 4 NW as warming stripes, 1884 to 2005
Year
Annual mean temperature
Difference from the station mean
1884
11.3 C
+0.40 C
1885
10.4 C
-0.47 C
1893
10.6 C
-0.27 C
1894
11.9 C
+1.03 C
1895
11.2 C
+0.34 C
1896
11.0 C
+0.14 C
1897
11.1 C
+0.25 C
1898
12.0 C
+1.11 C
1899
11.4 C
+0.50 C
1900
12.2 C
+1.32 C
1901
10.9 C
+0.06 C
1902
11.0 C
+0.12 C
1903
10.5 C
-0.37 C
1904
9.1 C
-1.77 C
1905
10.4 C
-0.52 C
1906
11.5 C
+0.60 C
1907
10.0 C
-0.90 C
1908
11.5 C
+0.62 C
1909
11.2 C
+0.27 C
1910
11.2 C
+0.27 C
1911
11.5 C
+0.66 C
1912
10.6 C
-0.26 C
1913
12.3 C
+1.46 C
1914
10.5 C
-0.37 C
1916
10.0 C
-0.88 C
1917
9.1 C
-1.76 C
1918
10.4 C
-0.44 C
1920
11.1 C
+0.26 C
1923
11.0 C
+0.07 C
1924
10.0 C
-0.90 C
1925
11.2 C
+0.33 C
1926
10.0 C
-0.85 C
1927
11.2 C
+0.36 C
1928
10.9 C
0.00 C
1931
12.4 C
+1.48 C
1932
11.8 C
+0.94 C
1936
11.1 C
+0.20 C
1937
11.1 C
+0.21 C
1938
11.5 C
+0.66 C
1939
11.4 C
+0.47 C
1940
9.6 C
-1.24 C
1941
11.3 C
+0.42 C
1942
11.1 C
+0.26 C
1943
11.0 C
+0.07 C
1947
11.3 C
+0.43 C
1948
11.2 C
+0.33 C
1949
12.8 C
+1.92 C
1950
11.2 C
+0.29 C
1951
11.6 C
+0.73 C
1952
11.8 C
+0.89 C
1953
12.4 C
+1.50 C
1954
11.6 C
+0.71 C
1955
11.7 C
+0.81 C
1956
11.2 C
+0.32 C
1957
11.9 C
+1.03 C
1958
10.4 C
-0.53 C
1959
12.0 C
+1.10 C
1960
10.9 C
-0.01 C
1961
11.1 C
+0.23 C
1962
10.4 C
-0.49 C
1963
10.7 C
-0.15 C
1964
11.3 C
+0.40 C
1965
11.0 C
+0.09 C
1966
11.0 C
+0.16 C
1967
10.6 C
-0.32 C
1968
11.2 C
+0.35 C
1971
10.4 C
-0.44 C
1972
10.0 C
-0.90 C
1973
11.4 C
+0.49 C
1974
10.4 C
-0.44 C
1975
10.8 C
-0.09 C
1976
9.8 C
-1.11 C
1977
10.1 C
-0.76 C
1978
9.4 C
-1.49 C
1979
10.3 C
-0.57 C
1980
10.4 C
-0.52 C
1981
10.2 C
-0.73 C
1983
11.0 C
+0.12 C
1984
10.5 C
-0.39 C
1985
10.6 C
-0.24 C
1986
10.4 C
-0.45 C
1987
10.5 C
-0.37 C
1988
10.2 C
-0.72 C
1989
10.1 C
-0.82 C
1990
11.6 C
+0.72 C
1991
11.5 C
+0.66 C
1992
9.9 C
-0.95 C
1993
10.4 C
-0.44 C
1994
10.3 C
-0.55 C
1995
10.6 C
-0.24 C
1996
10.3 C
-0.62 C
1999
11.1 C
+0.26 C
2000
10.0 C
-0.84 C
2001
10.7 C
-0.18 C
2002
11.0 C
+0.12 C
2003
9.8 C
-1.10 C
2004
10.4 C
-0.47 C
2005
10.7 C
-0.17 C
The annual mean temperature here has fallen by 0.05 C (0.01 to 0.09) per decade over 1884 to 2005. In Fahrenheit: 0.09 F (0.02 to 0.16) per decade. The slope is a straight line fitted to 98 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Somerville 4 NW
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.05 C (-0.09 to -0.01) per decade
-0.09 F (-0.16 to -0.02) per decade
1884 to 2005
98
Fall
Mean daily maximum
-0.04 C (-0.10 to 0.01) per decade
-0.08 F (-0.17 to 0.01) per decade
1884 to 2005
98
Not clearly different from zero
Mean daily minimum
-0.06 C (-0.10 to -0.01) per decade
-0.10 F (-0.18 to -0.02) per decade
1884 to 2005
98
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
1878 to 2006
Yearly extremes at Somerville 4 NW: 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)
1895
36.1 C (97.0 F)
122
Coldest night (TNn)
-28.9 C (-20.0 F)
1893
-18.9 C (-2.0 F)
122
Wettest day (Rx1day)
225.8 mm (8.9 in)
1971
63.8 mm (2.5 in)
123
Wettest five days (Rx5day)
238.0 mm (9.4 in)
1971
99.6 mm (3.9 in)
123
Longest dry spell (CDD)
43 days
1924
17 days
123
Hottest day (TXx)
The hottest day of the year at Somerville 4 NW, 1878 to 2006. The record is 42.8 C (109.0 F) in 1895, marked on the chart; the median year is 36.1 C (97.0 F).
Hottest day (TXx) at Somerville 4 NW by year
Year
Hottest day (TXx)
1878
n/a
1879
n/a
1880
n/a
1881
n/a
1882
n/a
1883
34.4 C (93.9 F)
1884
34.4 C (93.9 F)
1885
35.0 C (95.0 F)
1887
28.9 C (84.0 F)
1888
35.6 C (96.1 F)
1889
25.0 C (77.0 F)
1891
38.3 C (100.9 F)
1892
40.0 C (104.0 F)
1893
39.4 C (102.9 F)
1894
41.1 C (106.0 F)
1895
42.8 C (109.0 F)
1896
38.9 C (102.0 F)
1897
37.2 C (99.0 F)
1898
41.7 C (107.1 F)
1899
38.9 C (102.0 F)
1900
39.4 C (102.9 F)
1901
41.7 C (107.1 F)
1902
36.1 C (97.0 F)
1903
36.1 C (97.0 F)
1904
36.7 C (98.1 F)
1905
38.9 C (102.0 F)
1906
35.6 C (96.1 F)
1907
35.0 C (95.0 F)
1908
37.8 C (100.0 F)
1909
37.8 C (100.0 F)
1910
37.2 C (99.0 F)
1911
40.0 C (104.0 F)
1912
37.2 C (99.0 F)
1913
37.2 C (99.0 F)
1914
37.2 C (99.0 F)
1915
33.9 C (93.0 F)
1916
37.8 C (100.0 F)
1917
37.2 C (99.0 F)
1918
42.2 C (108.0 F)
1919
37.2 C (99.0 F)
1920
35.0 C (95.0 F)
1921
36.1 C (97.0 F)
1922
36.1 C (97.0 F)
1923
37.8 C (100.0 F)
1924
35.6 C (96.1 F)
1925
37.2 C (99.0 F)
1926
38.9 C (102.0 F)
1927
37.2 C (99.0 F)
1928
35.6 C (96.1 F)
1929
37.2 C (99.0 F)
1930
40.0 C (104.0 F)
1931
36.7 C (98.1 F)
1932
36.1 C (97.0 F)
1933
36.7 C (98.1 F)
1934
23.9 C (75.0 F)
1935
34.4 C (93.9 F)
1936
38.9 C (102.0 F)
1937
35.6 C (96.1 F)
1938
34.4 C (93.9 F)
1939
35.0 C (95.0 F)
1940
35.6 C (96.1 F)
1941
34.4 C (93.9 F)
1942
35.0 C (95.0 F)
1943
37.2 C (99.0 F)
1944
39.4 C (102.9 F)
1945
35.6 C (96.1 F)
1946
32.2 C (90.0 F)
1947
36.1 C (97.0 F)
1948
37.8 C (100.0 F)
1949
40.0 C (104.0 F)
1950
35.0 C (95.0 F)
1951
34.4 C (93.9 F)
1952
38.3 C (100.9 F)
1953
40.6 C (105.1 F)
1954
39.4 C (102.9 F)
1955
40.6 C (105.1 F)
1956
35.6 C (96.1 F)
1957
39.4 C (102.9 F)
1958
34.4 C (93.9 F)
1959
36.7 C (98.1 F)
1960
33.3 C (91.9 F)
1961
33.9 C (93.0 F)
1962
37.2 C (99.0 F)
1963
37.8 C (100.0 F)
1964
37.2 C (99.0 F)
1965
36.1 C (97.0 F)
1966
38.9 C (102.0 F)
1967
35.0 C (95.0 F)
1968
36.7 C (98.1 F)
1969
35.6 C (96.1 F)
1970
35.0 C (95.0 F)
1971
35.0 C (95.0 F)
1972
34.4 C (93.9 F)
1973
35.0 C (95.0 F)
1974
35.0 C (95.0 F)
1975
35.6 C (96.1 F)
1976
34.4 C (93.9 F)
1977
36.1 C (97.0 F)
1978
35.0 C (95.0 F)
1979
34.4 C (93.9 F)
1980
38.9 C (102.0 F)
1981
34.4 C (93.9 F)
1982
30.6 C (87.1 F)
1983
36.7 C (98.1 F)
1984
34.4 C (93.9 F)
1985
33.3 C (91.9 F)
1986
35.0 C (95.0 F)
1987
33.9 C (93.0 F)
1988
39.4 C (102.9 F)
1989
33.3 C (91.9 F)
1990
33.9 C (93.0 F)
1991
37.2 C (99.0 F)
1992
33.3 C (91.9 F)
1993
36.1 C (97.0 F)
1994
33.9 C (93.0 F)
1995
37.2 C (99.0 F)
1996
34.4 C (93.9 F)
1997
36.7 C (98.1 F)
1998
23.9 C (75.0 F)
1999
38.9 C (102.0 F)
2000
33.3 C (91.9 F)
2001
37.2 C (99.0 F)
2002
37.2 C (99.0 F)
2003
33.9 C (93.0 F)
2004
32.8 C (91.0 F)
2005
37.2 C (99.0 F)
2006
32.2 C (90.0 F)
Coldest night (TNn)
The coldest night of the year at Somerville 4 NW, 1878 to 2006. The record is -28.9 C (-20.0 F) in 1893, marked on the chart; the median year is -18.9 C (-2.0 F).
Coldest night (TNn) at Somerville 4 NW by year
Year
Coldest night (TNn)
1878
n/a
1879
n/a
1880
n/a
1881
n/a
1882
n/a
1883
-17.2 C (1.0 F)
1884
-22.2 C (-8.0 F)
1885
-18.9 C (-2.0 F)
1887
-11.1 C (12.0 F)
1888
-16.7 C (1.9 F)
1889
-16.7 C (1.9 F)
1891
-13.9 C (7.0 F)
1892
-17.2 C (1.0 F)
1893
-28.9 C (-20.0 F)
1894
-20.6 C (-5.1 F)
1895
-24.4 C (-11.9 F)
1896
-25.6 C (-14.1 F)
1897
-20.0 C (-4.0 F)
1898
-20.0 C (-4.0 F)
1899
-23.3 C (-9.9 F)
1900
-18.9 C (-2.0 F)
1901
-15.6 C (3.9 F)
1902
-15.0 C (5.0 F)
1903
-21.7 C (-7.1 F)
1904
-26.1 C (-15.0 F)
1905
-20.6 C (-5.1 F)
1906
-16.1 C (3.0 F)
1907
-23.3 C (-9.9 F)
1908
-18.3 C (-0.9 F)
1909
-17.8 C (0.0 F)
1910
-18.9 C (-2.0 F)
1911
-15.0 C (5.0 F)
1912
-25.6 C (-14.1 F)
1913
-12.8 C (9.0 F)
1914
-21.7 C (-7.1 F)
1915
-12.8 C (9.0 F)
1916
-23.3 C (-9.9 F)
1917
-27.8 C (-18.0 F)
1918
-26.7 C (-16.1 F)
1919
-20.0 C (-4.0 F)
1920
-20.0 C (-4.0 F)
1921
-15.0 C (5.0 F)
1922
-16.7 C (1.9 F)
1923
-20.0 C (-4.0 F)
1924
-15.6 C (3.9 F)
1925
-21.1 C (-6.0 F)
1926
-21.7 C (-7.1 F)
1927
-17.8 C (0.0 F)
1928
-19.4 C (-2.9 F)
1929
-17.2 C (1.0 F)
1930
-19.4 C (-2.9 F)
1931
-14.4 C (6.1 F)
1932
-21.1 C (-6.0 F)
1933
-24.4 C (-11.9 F)
1934
-12.8 C (9.0 F)
1935
-23.3 C (-9.9 F)
1936
-20.0 C (-4.0 F)
1937
-12.2 C (10.0 F)
1938
-18.3 C (-0.9 F)
1939
-17.2 C (1.0 F)
1940
-19.4 C (-2.9 F)
1941
-14.4 C (6.1 F)
1942
-20.0 C (-4.0 F)
1943
-23.3 C (-9.9 F)
1944
-16.7 C (1.9 F)
1945
-18.9 C (-2.0 F)
1946
-15.6 C (3.9 F)
1947
-17.2 C (1.0 F)
1948
-23.9 C (-11.0 F)
1949
-16.7 C (1.9 F)
1950
-23.3 C (-9.9 F)
1951
-18.3 C (-0.9 F)
1952
-17.2 C (1.0 F)
1953
-13.3 C (8.1 F)
1954
-23.3 C (-9.9 F)
1955
-18.9 C (-2.0 F)
1956
-15.0 C (5.0 F)
1957
-23.3 C (-9.9 F)
1958
-18.3 C (-0.9 F)
1959
-16.7 C (1.9 F)
1960
-20.0 C (-4.0 F)
1961
-26.1 C (-15.0 F)
1962
-20.0 C (-4.0 F)
1963
-20.6 C (-5.1 F)
1964
-18.9 C (-2.0 F)
1965
-19.4 C (-2.9 F)
1966
-17.8 C (0.0 F)
1967
-22.2 C (-8.0 F)
1968
-19.4 C (-2.9 F)
1969
-15.0 C (5.0 F)
1970
-14.4 C (6.1 F)
1971
-18.3 C (-0.9 F)
1972
-17.2 C (1.0 F)
1973
-15.6 C (3.9 F)
1974
-17.2 C (1.0 F)
1975
-13.9 C (7.0 F)
1976
-18.9 C (-2.0 F)
1977
-21.1 C (-6.0 F)
1978
-18.9 C (-2.0 F)
1979
-23.3 C (-9.9 F)
1980
-21.7 C (-7.1 F)
1981
-26.1 C (-15.0 F)
1982
-24.4 C (-11.9 F)
1983
-17.8 C (0.0 F)
1984
-26.7 C (-16.1 F)
1985
-21.7 C (-7.1 F)
1986
-16.1 C (3.0 F)
1987
-20.6 C (-5.1 F)
1988
-21.7 C (-7.1 F)
1989
-17.2 C (1.0 F)
1990
-15.0 C (5.0 F)
1991
-16.1 C (3.0 F)
1992
-15.0 C (5.0 F)
1993
-19.4 C (-2.9 F)
1994
-23.9 C (-11.0 F)
1995
-17.8 C (0.0 F)
1996
-21.1 C (-6.0 F)
1997
-17.2 C (1.0 F)
1998
-12.8 C (9.0 F)
1999
-15.6 C (3.9 F)
2000
-17.8 C (0.0 F)
2001
-20.6 C (-5.1 F)
2002
-17.2 C (1.0 F)
2003
-17.8 C (0.0 F)
2004
-17.8 C (0.0 F)
2005
-21.1 C (-6.0 F)
2006
-13.9 C (7.0 F)
Wettest day (Rx1day)
The wettest day of the year at Somerville 4 NW, 1878 to 2006. The record is 225.8 mm (8.9 in) in 1971, marked on the chart; the median year is 63.8 mm (2.5 in).
Wettest day (Rx1day) at Somerville 4 NW by year
Year
Wettest day (Rx1day)
1878
74.7 mm (2.9 in)
1879
85.9 mm (3.4 in)
1880
110.2 mm (4.3 in)
1881
55.9 mm (2.2 in)
1882
29.2 mm (1.1 in)
1883
65.5 mm (2.6 in)
1884
49.3 mm (1.9 in)
1885
45.7 mm (1.8 in)
1887
n/a
1888
n/a
1889
n/a
1891
n/a
1892
58.4 mm (2.3 in)
1893
99.3 mm (3.9 in)
1894
66.0 mm (2.6 in)
1895
61.5 mm (2.4 in)
1896
78.7 mm (3.1 in)
1897
64.0 mm (2.5 in)
1898
55.9 mm (2.2 in)
1899
55.9 mm (2.2 in)
1900
115.6 mm (4.6 in)
1901
63.5 mm (2.5 in)
1902
111.8 mm (4.4 in)
1903
109.2 mm (4.3 in)
1904
104.1 mm (4.1 in)
1905
97.3 mm (3.8 in)
1906
52.1 mm (2.1 in)
1907
63.5 mm (2.5 in)
1908
99.1 mm (3.9 in)
1909
83.8 mm (3.3 in)
1910
50.8 mm (2.0 in)
1911
85.1 mm (3.4 in)
1912
63.8 mm (2.5 in)
1913
93.7 mm (3.7 in)
1914
51.3 mm (2.0 in)
1915
133.9 mm (5.3 in)
1916
70.9 mm (2.8 in)
1917
48.3 mm (1.9 in)
1918
44.7 mm (1.8 in)
1919
73.7 mm (2.9 in)
1920
50.8 mm (2.0 in)
1921
76.5 mm (3.0 in)
1922
53.1 mm (2.1 in)
1923
57.2 mm (2.3 in)
1924
61.0 mm (2.4 in)
1925
59.9 mm (2.4 in)
1926
50.8 mm (2.0 in)
1927
105.2 mm (4.1 in)
1928
45.7 mm (1.8 in)
1929
103.9 mm (4.1 in)
1930
52.3 mm (2.1 in)
1931
54.4 mm (2.1 in)
1932
61.0 mm (2.4 in)
1933
41.7 mm (1.6 in)
1934
26.4 mm (1.0 in)
1935
63.8 mm (2.5 in)
1936
42.7 mm (1.7 in)
1937
88.4 mm (3.5 in)
1938
97.5 mm (3.8 in)
1939
45.5 mm (1.8 in)
1940
76.7 mm (3.0 in)
1941
53.6 mm (2.1 in)
1942
127.3 mm (5.0 in)
1943
52.3 mm (2.1 in)
1944
62.2 mm (2.4 in)
1945
45.7 mm (1.8 in)
1946
88.9 mm (3.5 in)
1947
64.0 mm (2.5 in)
1948
63.0 mm (2.5 in)
1949
36.1 mm (1.4 in)
1950
84.6 mm (3.3 in)
1951
115.3 mm (4.5 in)
1952
68.1 mm (2.7 in)
1953
64.0 mm (2.5 in)
1954
70.4 mm (2.8 in)
1955
93.0 mm (3.7 in)
1956
40.9 mm (1.6 in)
1957
31.2 mm (1.2 in)
1958
53.3 mm (2.1 in)
1959
50.5 mm (2.0 in)
1960
92.2 mm (3.6 in)
1961
48.3 mm (1.9 in)
1962
50.0 mm (2.0 in)
1963
92.2 mm (3.6 in)
1964
38.4 mm (1.5 in)
1965
37.1 mm (1.5 in)
1966
63.5 mm (2.5 in)
1967
106.7 mm (4.2 in)
1968
84.3 mm (3.3 in)
1969
81.5 mm (3.2 in)
1970
47.5 mm (1.9 in)
1971
225.8 mm (8.9 in)
1972
80.5 mm (3.2 in)
1973
110.5 mm (4.4 in)
1974
54.1 mm (2.1 in)
1975
74.7 mm (2.9 in)
1976
56.9 mm (2.2 in)
1977
71.6 mm (2.8 in)
1978
46.5 mm (1.8 in)
1979
73.2 mm (2.9 in)
1980
54.9 mm (2.2 in)
1981
81.0 mm (3.2 in)
1982
50.0 mm (2.0 in)
1983
62.2 mm (2.4 in)
1984
73.7 mm (2.9 in)
1985
67.3 mm (2.6 in)
1986
69.9 mm (2.8 in)
1987
65.5 mm (2.6 in)
1988
46.0 mm (1.8 in)
1989
64.5 mm (2.5 in)
1990
109.2 mm (4.3 in)
1991
96.8 mm (3.8 in)
1992
51.8 mm (2.0 in)
1993
58.9 mm (2.3 in)
1994
48.0 mm (1.9 in)
1995
55.4 mm (2.2 in)
1996
115.1 mm (4.5 in)
1997
97.3 mm (3.8 in)
1998
15.7 mm (0.6 in)
1999
205.7 mm (8.1 in)
2000
74.9 mm (2.9 in)
2001
60.7 mm (2.4 in)
2002
57.4 mm (2.3 in)
2003
55.9 mm (2.2 in)
2004
107.4 mm (4.2 in)
2005
135.1 mm (5.3 in)
2006
35.6 mm (1.4 in)
Wettest five days (Rx5day)
The wettest five days of the year at Somerville 4 NW, 1878 to 2006. The record is 238.0 mm (9.4 in) in 1971, marked on the chart; the median year is 99.6 mm (3.9 in).
Wettest five days (Rx5day) at Somerville 4 NW by year
Year
Wettest five days (Rx5day)
1878
89.9 mm (3.5 in)
1879
141.3 mm (5.6 in)
1880
110.2 mm (4.3 in)
1881
92.8 mm (3.7 in)
1882
33.8 mm (1.3 in)
1883
65.5 mm (2.6 in)
1884
49.3 mm (1.9 in)
1885
138.7 mm (5.5 in)
1887
n/a
1888
n/a
1889
n/a
1891
n/a
1892
110.2 mm (4.3 in)
1893
68.3 mm (2.7 in)
1894
155.1 mm (6.1 in)
1895
76.3 mm (3.0 in)
1896
98.3 mm (3.9 in)
1897
99.6 mm (3.9 in)
1898
96.0 mm (3.8 in)
1899
61.7 mm (2.4 in)
1900
130.9 mm (5.2 in)
1901
121.1 mm (4.8 in)
1902
121.5 mm (4.8 in)
1903
162.8 mm (6.4 in)
1904
125.4 mm (4.9 in)
1905
179.3 mm (7.1 in)
1906
78.5 mm (3.1 in)
1907
91.9 mm (3.6 in)
1908
113.1 mm (4.5 in)
1909
108.2 mm (4.3 in)
1910
80.3 mm (3.2 in)
1911
126.1 mm (5.0 in)
1912
111.8 mm (4.4 in)
1913
104.1 mm (4.1 in)
1914
55.1 mm (2.2 in)
1915
229.9 mm (9.1 in)
1916
108.5 mm (4.3 in)
1917
66.0 mm (2.6 in)
1918
85.4 mm (3.4 in)
1919
173.1 mm (6.8 in)
1920
87.1 mm (3.4 in)
1921
121.7 mm (4.8 in)
1922
80.5 mm (3.2 in)
1923
99.1 mm (3.9 in)
1924
83.1 mm (3.3 in)
1925
83.5 mm (3.3 in)
1926
98.0 mm (3.9 in)
1927
112.2 mm (4.4 in)
1928
94.5 mm (3.7 in)
1929
165.4 mm (6.5 in)
1930
76.0 mm (3.0 in)
1931
78.5 mm (3.1 in)
1932
87.2 mm (3.4 in)
1933
62.7 mm (2.5 in)
1934
34.0 mm (1.3 in)
1935
114.1 mm (4.5 in)
1936
85.4 mm (3.4 in)
1937
140.2 mm (5.5 in)
1938
149.2 mm (5.9 in)
1939
63.3 mm (2.5 in)
1940
81.8 mm (3.2 in)
1941
74.0 mm (2.9 in)
1942
127.8 mm (5.0 in)
1943
96.8 mm (3.8 in)
1944
109.7 mm (4.3 in)
1945
58.7 mm (2.3 in)
1946
150.9 mm (5.9 in)
1947
118.3 mm (4.7 in)
1948
99.8 mm (3.9 in)
1949
101.1 mm (4.0 in)
1950
95.5 mm (3.8 in)
1951
120.9 mm (4.8 in)
1952
105.5 mm (4.2 in)
1953
94.5 mm (3.7 in)
1954
80.3 mm (3.2 in)
1955
198.1 mm (7.8 in)
1956
56.1 mm (2.2 in)
1957
88.8 mm (3.5 in)
1958
114.5 mm (4.5 in)
1959
125.0 mm (4.9 in)
1960
153.4 mm (6.0 in)
1961
74.6 mm (2.9 in)
1962
87.6 mm (3.4 in)
1963
109.0 mm (4.3 in)
1964
58.7 mm (2.3 in)
1965
49.3 mm (1.9 in)
1966
84.3 mm (3.3 in)
1967
119.2 mm (4.7 in)
1968
102.0 mm (4.0 in)
1969
113.9 mm (4.5 in)
1970
94.0 mm (3.7 in)
1971
238.0 mm (9.4 in)
1972
109.0 mm (4.3 in)
1973
144.0 mm (5.7 in)
1974
77.4 mm (3.0 in)
1975
222.2 mm (8.7 in)
1976
73.4 mm (2.9 in)
1977
85.4 mm (3.4 in)
1978
96.5 mm (3.8 in)
1979
127.8 mm (5.0 in)
1980
73.5 mm (2.9 in)
1981
102.9 mm (4.1 in)
1982
78.4 mm (3.1 in)
1983
86.8 mm (3.4 in)
1984
127.3 mm (5.0 in)
1985
108.7 mm (4.3 in)
1986
128.0 mm (5.0 in)
1987
90.2 mm (3.6 in)
1988
130.3 mm (5.1 in)
1989
123.1 mm (4.8 in)
1990
166.3 mm (6.5 in)
1991
118.4 mm (4.7 in)
1992
72.4 mm (2.9 in)
1993
87.1 mm (3.4 in)
1994
78.9 mm (3.1 in)
1995
78.7 mm (3.1 in)
1996
148.7 mm (5.9 in)
1997
130.5 mm (5.1 in)
1998
17.7 mm (0.7 in)
1999
226.5 mm (8.9 in)
2000
123.9 mm (4.9 in)
2001
91.3 mm (3.6 in)
2002
74.6 mm (2.9 in)
2003
106.7 mm (4.2 in)
2004
152.1 mm (6.0 in)
2005
215.3 mm (8.5 in)
2006
51.3 mm (2.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at Somerville 4 NW, 1878 to 2006. The record is 43 days in 1924, marked on the chart; the median year is 17 days.
Longest dry spell (CDD) at Somerville 4 NW by year
Year
Longest dry spell (CDD)
1878
10 days
1879
19 days
1880
22 days
1881
20 days
1882
8 days
1883
13 days
1884
27 days
1885
16 days
1887
n/a
1888
n/a
1889
n/a
1891
n/a
1892
29 days
1893
13 days
1894
12 days
1895
17 days
1896
19 days
1897
18 days
1898
15 days
1899
11 days
1900
18 days
1901
26 days
1902
16 days
1903
17 days
1904
19 days
1905
13 days
1906
12 days
1907
11 days
1908
20 days
1909
16 days
1910
18 days
1911
17 days
1912
16 days
1913
18 days
1914
23 days
1915
26 days
1916
14 days
1917
23 days
1918
13 days
1919
14 days
1920
12 days
1921
15 days
1922
24 days
1923
21 days
1924
43 days
1925
16 days
1926
15 days
1927
13 days
1928
13 days
1929
13 days
1930
21 days
1931
19 days
1932
12 days
1933
15 days
1934
14 days
1935
15 days
1936
17 days
1937
15 days
1938
19 days
1939
18 days
1940
13 days
1941
21 days
1942
25 days
1943
18 days
1944
25 days
1945
22 days
1946
18 days
1947
16 days
1948
18 days
1949
22 days
1950
14 days
1951
11 days
1952
16 days
1953
16 days
1954
16 days
1955
32 days
1956
14 days
1957
20 days
1958
20 days
1959
27 days
1960
18 days
1961
15 days
1962
19 days
1963
26 days
1964
23 days
1965
19 days
1966
20 days
1967
19 days
1968
25 days
1969
14 days
1970
17 days
1971
21 days
1972
14 days
1973
24 days
1974
12 days
1975
12 days
1976
27 days
1977
21 days
1978
19 days
1979
12 days
1980
25 days
1981
25 days
1982
15 days
1983
16 days
1984
11 days
1985
12 days
1986
16 days
1987
14 days
1988
22 days
1989
16 days
1990
12 days
1991
23 days
1992
13 days
1993
13 days
1994
12 days
1995
25 days
1996
13 days
1997
9 days
1998
12 days
1999
19 days
2000
21 days
2001
29 days
2002
13 days
2003
15 days
2004
17 days
2005
17 days
2006
16 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
98 years with a frost
Across 98 years with a frost, the median last spring frost at Somerville 4 NW falls on 27 April and the median first autumn frost on 12 October, which leaves a median of 168 days between them.
In 1973 to 2005 the median growing season was 169 days. That is 1 day more than in 1884 to 1924.
Fitted over all years, the growing season changes by -0.2 days per decade at this station.
Frost dates and growing season at Somerville 4 NW
Measure
Median, all years
Earliest period (1884 to 1924)
Recent period (1973 to 2005)
Recent against earliest
Fitted trend
Last spring frost
27 April
23 April
26 April
3 days later
+0.4 days per decade
First autumn frost
12 October
13 October
12 October
1 day earlier
+0.1 days per decade
Growing days
168 days
168 days
169 days
1 day more
-0.2 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
106 years, 1879 to 2005
A day with at least 66.8 mm (2.6 in) of rain is expected about once in 2 years. A day with at least 188.5 mm (7.4 in) of rain is expected about once in 100 years.
Rainfall return levels at Somerville 4 NW: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
66.8 mm (2.6 in)
5 years
91.5 mm (3.6 in)
10 years
110.6 mm (4.4 in)
25 years
138.5 mm (5.5 in)
50 years
162.1 mm (6.4 in)
100 years
188.5 mm (7.4 in)
The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 106 years of values from 1879 to 2005.
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: 225.8 mm (8.9 in) in 1971; 205.7 mm (8.1 in) in 1999; 135.1 mm (5.3 in) in 2005.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Somerville 4 NW, at 1958. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1958 ran 0.3 C (0.5 F) lower than in the years before (possible change).
Suspected changes in the annual mean temperature at Somerville 4 NW, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1958
-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 Somerville 4 NW standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Somerville 4 NW 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.