Record envelope, standing records and threshold days for Chestnut Hill (USC00191447), Massachusetts, United States, with 94 years of record.
Key Facts for Chestnut Hill
Chestnut Hill (USC00191447) is a weather station in Massachusetts, United States at 42.33 latitude and -71.15 longitude, 37 m (121 ft) above sea level.
The station reports from 1893 to 1986, 94 years of record.
1,464 records set at Chestnut Hill still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Chestnut Hill set a daily record high minimum temperature of 16.7 C (62.1 F) on 30 April 1986.
About the Station
Location: Massachusetts, United States, 42.33 latitude, -71.15 longitude.
Elevation: 37 m (121 ft).
Period of record: 1893 to 1986, 94 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 Chestnut Hill. 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 Chestnut Hill, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
21.1 C (70.0 F)
-28.3 C (-18.9 F)
n/a
n/a
Feb
20.6 C (69.1 F)
-28.3 C (-18.9 F)
n/a
n/a
Mar
29.4 C (84.9 F)
-23.3 C (-9.9 F)
n/a
n/a
Apr
33.3 C (91.9 F)
-12.8 C (9.0 F)
n/a
n/a
May
35.6 C (96.1 F)
-6.1 C (21.0 F)
n/a
n/a
Jun
37.8 C (100.0 F)
1.7 C (35.1 F)
n/a
n/a
Jul
41.1 C (106.0 F)
4.4 C (39.9 F)
n/a
n/a
Aug
40.0 C (104.0 F)
2.2 C (36.0 F)
n/a
n/a
Sep
37.8 C (100.0 F)
-3.9 C (25.0 F)
n/a
n/a
Oct
32.8 C (91.0 F)
-7.2 C (19.0 F)
n/a
n/a
Nov
28.3 C (82.9 F)
-13.9 C (7.0 F)
n/a
n/a
Dec
20.0 C (68.0 F)
-25.6 C (-14.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Chestnut Hill still stand. 1986 holds the most, with 43.
Standing records at Chestnut Hill by the year they were set
Year set
Standing records
1893
11
1894
24
1895
24
1896
27
1897
17
1898
17
1899
22
1900
18
1901
14
1902
11
1903
22
1904
22
1905
19
1906
19
1907
18
1908
16
1909
12
1910
12
1911
23
1912
12
1913
12
1914
26
1915
11
1916
21
1917
14
1918
32
1919
33
1920
23
1921
14
1922
10
1923
23
1924
14
1925
18
1926
17
1927
8
1928
8
1929
22
1930
14
1931
9
1932
19
1933
17
1934
17
1935
13
1936
10
1937
18
1938
15
1939
10
1940
11
1941
8
1942
14
1943
9
1944
13
1945
16
1946
18
1947
12
1948
15
1949
20
1950
18
1951
14
1952
13
1953
18
1954
19
1955
11
1956
8
1957
20
1958
5
1959
12
1960
4
1961
7
1962
15
1963
14
1964
10
1965
13
1966
12
1967
9
1968
7
1969
5
1970
10
1971
10
1972
7
1973
5
1974
20
1975
13
1976
18
1977
13
1978
5
1979
32
1980
8
1981
8
1982
22
1983
16
1984
42
1985
14
1986
43
All-Time Record Progression
2 new records
2 all-time records were set at Chestnut Hill between 28 June 1941 and 10 February 1969. Each dot is a new record.
When Chestnut Hill set new all-time records
Date
Kind
Detail
1941-06-28
Record high minimum temperature
Record high minimum temperature 29.4 C (84.9 F)
1969-02-10
Record daily snowfall
Record daily snowfall 50.8 cm (20.0 in)
Wettest Day of Each Month
Oct: 191.8 mm (7.6 in)
The wettest day on record for each calendar month at Chestnut Hill. The most was 191.8 mm (7.6 in) on 13 October 1895.
Record daily precipitation for each month at Chestnut Hill
Month
Record daily precipitation (mm)
Date
Jan
75.7 mm (3.0 in)
9 January 1935
Feb
88.4 mm (3.5 in)
22 February 1898
Mar
78.7 mm (3.1 in)
19 March 1968
Apr
136.4 mm (5.4 in)
30 April 1904
May
187.2 mm (7.4 in)
18 May 1905
Jun
111.5 mm (4.4 in)
9 June 1931
Jul
87.4 mm (3.4 in)
28 July 1911
Aug
165.1 mm (6.5 in)
20 August 1955
Sep
151.1 mm (5.9 in)
12 September 1954
Oct
191.8 mm (7.6 in)
13 October 1895
Nov
103.6 mm (4.1 in)
5 November 1955
Dec
134.6 mm (5.3 in)
27 December 1969
Period of Record Coverage
1893 to 1986
Complete yearUnder 90 percent of days
94 years of record at Chestnut Hill, 1893 to 1986. 8 years have data for under 90 percent of days and are left out of rankings: 1936, 1968, 1974, 1976, 1978, 1980, 1985, 1986.
Cooler than the station meanWarmer than the station mean
One stripe for each of 82 complete years at Chestnut Hill, 1893 to 1985. Blue stripes are years cooler than the station's own mean of 10.1 C (50.2 F); red stripes are warmer. The coolest year was 1904, at 8.0 C (46.5 F), and the warmest was 1949, at 12.4 C (54.2 F). The strongest colour marks a difference of 2.3 C (4.1 F).
Annual mean temperature at Chestnut Hill as warming stripes, 1893 to 1985
Year
Annual mean temperature
Difference from the station mean
1893
8.9 C
-1.23 C
1894
10.2 C
+0.15 C
1895
9.6 C
-0.52 C
1896
9.5 C
-0.59 C
1897
9.8 C
-0.33 C
1898
10.1 C
+0.03 C
1899
9.8 C
-0.30 C
1900
10.1 C
+0.05 C
1901
9.3 C
-0.83 C
1902
9.7 C
-0.36 C
1903
9.5 C
-0.63 C
1904
8.0 C
-2.05 C
1905
9.1 C
-0.99 C
1906
10.0 C
-0.08 C
1907
9.2 C
-0.91 C
1908
10.5 C
+0.38 C
1909
10.1 C
-0.01 C
1910
10.2 C
+0.10 C
1911
10.1 C
+0.05 C
1912
9.5 C
-0.54 C
1913
10.9 C
+0.79 C
1914
9.3 C
-0.77 C
1915
10.1 C
+0.02 C
1916
9.3 C
-0.74 C
1917
8.8 C
-1.33 C
1918
8.6 C
-1.47 C
1919
8.4 C
-1.64 C
1921
11.7 C
+1.57 C
1922
10.2 C
+0.12 C
1923
8.8 C
-1.27 C
1924
9.0 C
-1.11 C
1925
9.9 C
-0.22 C
1926
8.6 C
-1.48 C
1928
10.2 C
+0.14 C
1929
9.6 C
-0.45 C
1930
10.3 C
+0.17 C
1931
10.3 C
+0.18 C
1932
9.8 C
-0.31 C
1933
10.3 C
+0.19 C
1934
10.2 C
+0.16 C
1935
10.1 C
0.00 C
1937
11.3 C
+1.17 C
1938
11.3 C
+1.26 C
1939
10.4 C
+0.32 C
1940
9.7 C
-0.42 C
1941
11.3 C
+1.19 C
1942
11.2 C
+1.16 C
1943
10.6 C
+0.52 C
1944
11.1 C
+1.02 C
1945
10.9 C
+0.81 C
1946
11.3 C
+1.22 C
1947
11.0 C
+0.91 C
1948
10.6 C
+0.52 C
1949
12.4 C
+2.27 C
1951
11.4 C
+1.33 C
1952
11.5 C
+1.44 C
1953
12.2 C
+2.16 C
1954
11.1 C
+1.06 C
1955
11.0 C
+0.89 C
1956
10.4 C
+0.34 C
1957
11.7 C
+1.58 C
1959
10.6 C
+0.50 C
1960
10.2 C
+0.14 C
1961
10.4 C
+0.28 C
1962
9.4 C
-0.67 C
1963
10.3 C
+0.18 C
1964
10.2 C
+0.10 C
1965
10.4 C
+0.31 C
1966
10.4 C
+0.36 C
1967
9.7 C
-0.38 C
1968
10.1 C
+0.02 C
1969
10.4 C
+0.28 C
1970
9.1 C
-1.02 C
1971
9.7 C
-0.40 C
1972
8.7 C
-1.38 C
1975
10.1 C
0.00 C
1977
9.9 C
-0.20 C
1979
9.6 C
-0.49 C
1982
8.9 C
-1.17 C
1983
9.8 C
-0.33 C
1984
8.6 C
-1.44 C
1985
11.0 C
+0.91 C
The annual mean temperature here has risen by 0.08 C (0.01 to 0.16) per decade over 1893 to 1985. In Fahrenheit: 0.15 F (0.02 to 0.28) per decade. The slope is a straight line fitted to 82 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Chestnut Hill
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.08 C (0.01 to 0.16) per decade
0.15 F (0.02 to 0.28) per decade
1893 to 1985
82
Rise
Mean daily maximum
0.02 C (-0.05 to 0.09) per decade
0.03 F (-0.10 to 0.16) per decade
1893 to 1985
82
Not clearly different from zero
Mean daily minimum
0.1 C (0.1 to 0.2) per decade
0.3 F (0.1 to 0.4) per decade
1893 to 1985
82
Rise
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 1986
Yearly extremes at Chestnut Hill: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
41.1 C (106.0 F)
1894
35.6 C (96.1 F)
94
Coldest night (TNn)
-28.3 C (-18.9 F)
1920
-19.4 C (-2.9 F)
94
Wettest day (Rx1day)
191.8 mm (7.6 in)
1895
66.0 mm (2.6 in)
94
Wettest five days (Rx5day)
330.7 mm (13.0 in)
1955
98.7 mm (3.9 in)
94
Longest dry spell (CDD)
45 days
1924
17 days
94
Hottest day (TXx)
The hottest day of the year at Chestnut Hill, 1893 to 1986. The record is 41.1 C (106.0 F) in 1894, marked on the chart; the median year is 35.6 C (96.1 F).
Hottest day (TXx) at Chestnut Hill by year
Year
Hottest day (TXx)
1893
34.4 C (93.9 F)
1894
41.1 C (106.0 F)
1895
35.6 C (96.1 F)
1896
36.1 C (97.0 F)
1897
34.4 C (93.9 F)
1898
36.7 C (98.1 F)
1899
35.6 C (96.1 F)
1900
36.7 C (98.1 F)
1901
37.2 C (99.0 F)
1902
33.3 C (91.9 F)
1903
35.0 C (95.0 F)
1904
34.4 C (93.9 F)
1905
35.6 C (96.1 F)
1906
34.4 C (93.9 F)
1907
37.2 C (99.0 F)
1908
38.3 C (100.9 F)
1909
36.7 C (98.1 F)
1910
35.0 C (95.0 F)
1911
39.4 C (102.9 F)
1912
37.2 C (99.0 F)
1913
36.7 C (98.1 F)
1914
35.0 C (95.0 F)
1915
34.4 C (93.9 F)
1916
35.0 C (95.0 F)
1917
37.2 C (99.0 F)
1918
35.6 C (96.1 F)
1919
37.8 C (100.0 F)
1920
33.3 C (91.9 F)
1921
34.4 C (93.9 F)
1922
33.9 C (93.0 F)
1923
35.0 C (95.0 F)
1924
36.1 C (97.0 F)
1925
35.6 C (96.1 F)
1926
38.9 C (102.0 F)
1927
35.0 C (95.0 F)
1928
35.6 C (96.1 F)
1929
35.0 C (95.0 F)
1930
35.6 C (96.1 F)
1931
35.6 C (96.1 F)
1932
33.9 C (93.0 F)
1933
37.2 C (99.0 F)
1934
36.1 C (97.0 F)
1935
34.4 C (93.9 F)
1936
35.6 C (96.1 F)
1937
36.7 C (98.1 F)
1938
34.4 C (93.9 F)
1939
35.0 C (95.0 F)
1940
34.4 C (93.9 F)
1941
35.6 C (96.1 F)
1942
33.3 C (91.9 F)
1943
35.6 C (96.1 F)
1944
37.8 C (100.0 F)
1945
35.0 C (95.0 F)
1946
35.0 C (95.0 F)
1947
35.0 C (95.0 F)
1948
36.1 C (97.0 F)
1949
37.8 C (100.0 F)
1950
35.6 C (96.1 F)
1951
33.9 C (93.0 F)
1952
38.3 C (100.9 F)
1953
37.8 C (100.0 F)
1954
35.6 C (96.1 F)
1955
37.2 C (99.0 F)
1956
36.1 C (97.0 F)
1957
35.0 C (95.0 F)
1958
32.8 C (91.0 F)
1959
33.9 C (93.0 F)
1960
32.2 C (90.0 F)
1961
32.8 C (91.0 F)
1962
33.9 C (93.0 F)
1963
35.6 C (96.1 F)
1964
34.4 C (93.9 F)
1965
34.4 C (93.9 F)
1966
34.4 C (93.9 F)
1967
33.3 C (91.9 F)
1968
35.0 C (95.0 F)
1969
34.4 C (93.9 F)
1970
33.3 C (91.9 F)
1971
34.4 C (93.9 F)
1972
35.0 C (95.0 F)
1973
35.6 C (96.1 F)
1974
33.9 C (93.0 F)
1975
38.9 C (102.0 F)
1976
33.9 C (93.0 F)
1977
37.8 C (100.0 F)
1978
37.8 C (100.0 F)
1979
35.0 C (95.0 F)
1980
36.7 C (98.1 F)
1981
35.6 C (96.1 F)
1982
37.2 C (99.0 F)
1983
40.0 C (104.0 F)
1984
37.2 C (99.0 F)
1985
35.6 C (96.1 F)
1986
26.7 C (80.1 F)
Coldest night (TNn)
The coldest night of the year at Chestnut Hill, 1893 to 1986. The record is -28.3 C (-18.9 F) in 1920, marked on the chart; the median year is -19.4 C (-2.9 F).
Coldest night (TNn) at Chestnut Hill by year
Year
Coldest night (TNn)
1893
-21.7 C (-7.1 F)
1894
-23.3 C (-9.9 F)
1895
-22.8 C (-9.0 F)
1896
-25.0 C (-13.0 F)
1897
-18.3 C (-0.9 F)
1898
-22.8 C (-9.0 F)
1899
-23.3 C (-9.9 F)
1900
-21.1 C (-6.0 F)
1901
-21.1 C (-6.0 F)
1902
-23.3 C (-9.9 F)
1903
-21.1 C (-6.0 F)
1904
-27.2 C (-17.0 F)
1905
-19.4 C (-2.9 F)
1906
-18.3 C (-0.9 F)
1907
-23.3 C (-9.9 F)
1908
-19.4 C (-2.9 F)
1909
-18.9 C (-2.0 F)
1910
-21.1 C (-6.0 F)
1911
-18.9 C (-2.0 F)
1912
-22.2 C (-8.0 F)
1913
-17.8 C (0.0 F)
1914
-24.4 C (-11.9 F)
1915
-17.2 C (1.0 F)
1916
-22.2 C (-8.0 F)
1917
-25.6 C (-14.1 F)
1918
-25.6 C (-14.1 F)
1919
-25.6 C (-14.1 F)
1920
-28.3 C (-18.9 F)
1921
-20.0 C (-4.0 F)
1922
-23.9 C (-11.0 F)
1923
-22.8 C (-9.0 F)
1924
-22.8 C (-9.0 F)
1925
-21.1 C (-6.0 F)
1926
-18.3 C (-0.9 F)
1927
-17.2 C (1.0 F)
1928
-18.3 C (-0.9 F)
1929
-20.0 C (-4.0 F)
1930
-19.4 C (-2.9 F)
1931
-17.8 C (0.0 F)
1932
-17.8 C (0.0 F)
1933
-25.0 C (-13.0 F)
1934
-25.6 C (-14.1 F)
1935
-22.2 C (-8.0 F)
1936
-17.2 C (1.0 F)
1937
-10.6 C (12.9 F)
1938
-18.9 C (-2.0 F)
1939
-15.0 C (5.0 F)
1940
-16.1 C (3.0 F)
1941
-15.6 C (3.9 F)
1942
-25.6 C (-14.1 F)
1943
-23.3 C (-9.9 F)
1944
-14.4 C (6.1 F)
1945
-19.4 C (-2.9 F)
1946
-17.2 C (1.0 F)
1947
-15.6 C (3.9 F)
1948
-19.4 C (-2.9 F)
1949
-13.3 C (8.1 F)
1950
-18.3 C (-0.9 F)
1951
-17.8 C (0.0 F)
1952
-17.8 C (0.0 F)
1953
-12.8 C (9.0 F)
1954
-19.4 C (-2.9 F)
1955
-20.6 C (-5.1 F)
1956
-16.1 C (3.0 F)
1957
-25.6 C (-14.1 F)
1958
-16.1 C (3.0 F)
1959
-17.8 C (0.0 F)
1960
-13.9 C (7.0 F)
1961
-17.8 C (0.0 F)
1962
-20.6 C (-5.1 F)
1963
-18.9 C (-2.0 F)
1964
-21.1 C (-6.0 F)
1965
-20.6 C (-5.1 F)
1966
-17.8 C (0.0 F)
1967
-16.7 C (1.9 F)
1968
-21.1 C (-6.0 F)
1969
-15.0 C (5.0 F)
1970
-23.3 C (-9.9 F)
1971
-17.8 C (0.0 F)
1972
-17.8 C (0.0 F)
1973
-18.9 C (-2.0 F)
1974
-20.6 C (-5.1 F)
1975
-16.7 C (1.9 F)
1976
-22.2 C (-8.0 F)
1977
-16.7 C (1.9 F)
1978
-17.8 C (0.0 F)
1979
-21.1 C (-6.0 F)
1980
-17.8 C (0.0 F)
1981
-22.2 C (-8.0 F)
1982
-20.0 C (-4.0 F)
1983
-19.4 C (-2.9 F)
1984
-28.3 C (-18.9 F)
1985
-17.8 C (0.0 F)
1986
-5.6 C (21.9 F)
Wettest day (Rx1day)
The wettest day of the year at Chestnut Hill, 1893 to 1986. The record is 191.8 mm (7.6 in) in 1895, marked on the chart; the median year is 66.0 mm (2.6 in).
Wettest day (Rx1day) at Chestnut Hill by year
Year
Wettest day (Rx1day)
1893
85.3 mm (3.4 in)
1894
46.2 mm (1.8 in)
1895
191.8 mm (7.6 in)
1896
65.3 mm (2.6 in)
1897
63.0 mm (2.5 in)
1898
88.4 mm (3.5 in)
1899
84.8 mm (3.3 in)
1900
74.4 mm (2.9 in)
1901
68.1 mm (2.7 in)
1902
60.2 mm (2.4 in)
1903
71.9 mm (2.8 in)
1904
136.4 mm (5.4 in)
1905
187.2 mm (7.4 in)
1906
98.8 mm (3.9 in)
1907
81.0 mm (3.2 in)
1908
59.9 mm (2.4 in)
1909
77.5 mm (3.1 in)
1910
66.8 mm (2.6 in)
1911
87.4 mm (3.4 in)
1912
83.1 mm (3.3 in)
1913
32.3 mm (1.3 in)
1914
54.6 mm (2.1 in)
1915
106.4 mm (4.2 in)
1916
38.1 mm (1.5 in)
1917
81.3 mm (3.2 in)
1918
56.9 mm (2.2 in)
1919
59.2 mm (2.3 in)
1920
56.1 mm (2.2 in)
1921
77.2 mm (3.0 in)
1922
90.4 mm (3.6 in)
1923
55.9 mm (2.2 in)
1924
133.4 mm (5.3 in)
1925
42.9 mm (1.7 in)
1926
45.5 mm (1.8 in)
1927
66.0 mm (2.6 in)
1928
52.6 mm (2.1 in)
1929
98.8 mm (3.9 in)
1930
54.9 mm (2.2 in)
1931
111.5 mm (4.4 in)
1932
98.8 mm (3.9 in)
1933
92.2 mm (3.6 in)
1934
49.5 mm (1.9 in)
1935
75.7 mm (3.0 in)
1936
91.2 mm (3.6 in)
1937
67.6 mm (2.7 in)
1938
79.0 mm (3.1 in)
1939
66.0 mm (2.6 in)
1940
43.9 mm (1.7 in)
1941
52.6 mm (2.1 in)
1942
47.8 mm (1.9 in)
1943
56.9 mm (2.2 in)
1944
84.8 mm (3.3 in)
1945
62.5 mm (2.5 in)
1946
56.4 mm (2.2 in)
1947
87.9 mm (3.5 in)
1948
42.7 mm (1.7 in)
1949
103.1 mm (4.1 in)
1950
77.5 mm (3.1 in)
1951
46.2 mm (1.8 in)
1952
80.3 mm (3.2 in)
1953
59.7 mm (2.4 in)
1954
151.1 mm (5.9 in)
1955
165.1 mm (6.5 in)
1956
60.7 mm (2.4 in)
1957
42.2 mm (1.7 in)
1958
64.8 mm (2.6 in)
1959
58.4 mm (2.3 in)
1960
64.3 mm (2.5 in)
1961
76.2 mm (3.0 in)
1962
141.0 mm (5.6 in)
1963
76.2 mm (3.0 in)
1964
48.3 mm (1.9 in)
1965
46.2 mm (1.8 in)
1966
53.1 mm (2.1 in)
1967
61.0 mm (2.4 in)
1968
78.7 mm (3.1 in)
1969
134.6 mm (5.3 in)
1970
63.0 mm (2.5 in)
1971
53.3 mm (2.1 in)
1972
62.5 mm (2.5 in)
1973
61.0 mm (2.4 in)
1974
61.2 mm (2.4 in)
1975
58.4 mm (2.3 in)
1976
50.5 mm (2.0 in)
1977
76.2 mm (3.0 in)
1978
63.5 mm (2.5 in)
1979
58.4 mm (2.3 in)
1980
62.5 mm (2.5 in)
1981
66.5 mm (2.6 in)
1982
101.6 mm (4.0 in)
1983
101.6 mm (4.0 in)
1984
76.7 mm (3.0 in)
1985
124.7 mm (4.9 in)
1986
58.4 mm (2.3 in)
Wettest five days (Rx5day)
The wettest five days of the year at Chestnut Hill, 1893 to 1986. The record is 330.7 mm (13.0 in) in 1955, marked on the chart; the median year is 98.7 mm (3.9 in).
Wettest five days (Rx5day) at Chestnut Hill by year
Year
Wettest five days (Rx5day)
1893
97.2 mm (3.8 in)
1894
85.1 mm (3.4 in)
1895
193.1 mm (7.6 in)
1896
104.1 mm (4.1 in)
1897
73.7 mm (2.9 in)
1898
94.0 mm (3.7 in)
1899
88.4 mm (3.5 in)
1900
97.6 mm (3.8 in)
1901
94.5 mm (3.7 in)
1902
65.8 mm (2.6 in)
1903
101.3 mm (4.0 in)
1904
136.4 mm (5.4 in)
1905
138.2 mm (5.4 in)
1906
102.1 mm (4.0 in)
1907
94.7 mm (3.7 in)
1908
87.9 mm (3.5 in)
1909
95.1 mm (3.7 in)
1910
97.0 mm (3.8 in)
1911
114.5 mm (4.5 in)
1912
107.2 mm (4.2 in)
1913
71.1 mm (2.8 in)
1914
67.0 mm (2.6 in)
1915
165.0 mm (6.5 in)
1916
69.1 mm (2.7 in)
1917
94.0 mm (3.7 in)
1918
80.7 mm (3.2 in)
1919
111.5 mm (4.4 in)
1920
79.5 mm (3.1 in)
1921
129.5 mm (5.1 in)
1922
173.0 mm (6.8 in)
1923
68.6 mm (2.7 in)
1924
146.6 mm (5.8 in)
1925
115.6 mm (4.6 in)
1926
77.8 mm (3.1 in)
1927
106.6 mm (4.2 in)
1928
79.2 mm (3.1 in)
1929
136.4 mm (5.4 in)
1930
91.3 mm (3.6 in)
1931
153.2 mm (6.0 in)
1932
171.2 mm (6.7 in)
1933
205.7 mm (8.1 in)
1934
73.6 mm (2.9 in)
1935
123.2 mm (4.9 in)
1936
94.0 mm (3.7 in)
1937
81.0 mm (3.2 in)
1938
172.2 mm (6.8 in)
1939
95.4 mm (3.8 in)
1940
89.1 mm (3.5 in)
1941
54.1 mm (2.1 in)
1942
65.6 mm (2.6 in)
1943
71.9 mm (2.8 in)
1944
142.0 mm (5.6 in)
1945
95.5 mm (3.8 in)
1946
106.4 mm (4.2 in)
1947
121.4 mm (4.8 in)
1948
58.7 mm (2.3 in)
1949
111.7 mm (4.4 in)
1950
84.4 mm (3.3 in)
1951
95.4 mm (3.8 in)
1952
126.0 mm (5.0 in)
1953
127.2 mm (5.0 in)
1954
184.3 mm (7.3 in)
1955
330.7 mm (13.0 in)
1956
150.1 mm (5.9 in)
1957
69.8 mm (2.7 in)
1958
103.1 mm (4.1 in)
1959
89.2 mm (3.5 in)
1960
100.7 mm (4.0 in)
1961
145.8 mm (5.7 in)
1962
218.0 mm (8.6 in)
1963
101.3 mm (4.0 in)
1964
67.1 mm (2.6 in)
1965
60.1 mm (2.4 in)
1966
80.8 mm (3.2 in)
1967
77.5 mm (3.1 in)
1968
160.5 mm (6.3 in)
1969
167.0 mm (6.6 in)
1970
84.0 mm (3.3 in)
1971
99.8 mm (3.9 in)
1972
78.1 mm (3.1 in)
1973
88.6 mm (3.5 in)
1974
67.6 mm (2.7 in)
1975
119.1 mm (4.7 in)
1976
103.8 mm (4.1 in)
1977
86.2 mm (3.4 in)
1978
100.6 mm (4.0 in)
1979
138.9 mm (5.5 in)
1980
67.6 mm (2.7 in)
1981
109.4 mm (4.3 in)
1982
226.1 mm (8.9 in)
1983
264.7 mm (10.4 in)
1984
206.9 mm (8.1 in)
1985
124.7 mm (4.9 in)
1986
76.7 mm (3.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at Chestnut Hill, 1893 to 1986. The record is 45 days in 1924, marked on the chart; the median year is 17 days.
Longest dry spell (CDD) at Chestnut Hill by year
Year
Longest dry spell (CDD)
1893
16 days
1894
18 days
1895
18 days
1896
15 days
1897
15 days
1898
9 days
1899
16 days
1900
18 days
1901
26 days
1902
17 days
1903
17 days
1904
18 days
1905
13 days
1906
12 days
1907
15 days
1908
21 days
1909
13 days
1910
15 days
1911
17 days
1912
19 days
1913
14 days
1914
25 days
1915
36 days
1916
13 days
1917
21 days
1918
19 days
1919
19 days
1920
25 days
1921
18 days
1922
20 days
1923
20 days
1924
45 days
1925
19 days
1926
16 days
1927
15 days
1928
10 days
1929
14 days
1930
29 days
1931
15 days
1932
13 days
1933
12 days
1934
17 days
1935
20 days
1936
22 days
1937
13 days
1938
13 days
1939
26 days
1940
12 days
1941
19 days
1942
14 days
1943
19 days
1944
18 days
1945
13 days
1946
17 days
1947
35 days
1948
12 days
1949
11 days
1950
22 days
1951
12 days
1952
16 days
1953
14 days
1954
15 days
1955
24 days
1956
16 days
1957
19 days
1958
21 days
1959
15 days
1960
17 days
1961
17 days
1962
13 days
1963
24 days
1964
20 days
1965
22 days
1966
14 days
1967
12 days
1968
22 days
1969
22 days
1970
13 days
1971
14 days
1972
25 days
1973
16 days
1974
15 days
1975
21 days
1976
20 days
1977
15 days
1978
16 days
1979
14 days
1980
18 days
1981
17 days
1982
12 days
1983
20 days
1984
19 days
1985
15 days
1986
13 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
82 years with a frost
Across 82 years with a frost, the median last spring frost at Chestnut Hill falls on 25 April and the median first autumn frost on 19 October, which leaves a median of 176 days between them.
In 1948 to 1985 the median growing season was 185 days. That is 16 days more than in 1893 to 1923.
Fitted over all years, the growing season changes by +1.9 days per decade at this station.
Frost dates and growing season at Chestnut Hill
Measure
Median, all years
Earliest period (1893 to 1923)
Recent period (1948 to 1985)
Recent against earliest
Fitted trend
Last spring frost
25 April
29 April
21 April
8 days earlier
-0.9 days per decade
First autumn frost
19 October
15 October
23 October
8 days later
+1.0 days per decade
Growing days
176 days
169 days
185 days
16 days more
+1.9 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
89 years, 1893 to 1985
A day with at least 69.0 mm (2.7 in) of rain is expected about once in 2 years. A day with at least 202.7 mm (8.0 in) of rain is expected about once in 100 years.
Rainfall return levels at Chestnut Hill: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
69.0 mm (2.7 in)
5 years
93.6 mm (3.7 in)
10 years
113.6 mm (4.5 in)
25 years
144.1 mm (5.7 in)
50 years
171.3 mm (6.7 in)
100 years
202.7 mm (8.0 in)
Longer than the 89 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, 89 years of values from 1893 to 1985.
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: 191.8 mm (7.6 in) in 1895; 187.2 mm (7.4 in) in 1905; 165.1 mm (6.5 in) in 1955.
Station Changes
2 suspected
2 changes were suspected in the annual mean temperature of Chestnut Hill, at 1937 and 1959. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1937 ran 0.4 C (0.8 F) higher than in the years before (possible change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1959 ran 0.4 C (0.7 F) lower than in the years before (likely change).
Suspected changes in the annual mean temperature at Chestnut Hill, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1937
+0.4
+0.8
possible
5
1959
-0.4
-0.7
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 Chestnut Hill standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Chestnut Hill 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 2026-10-16 (16 October 2026). Records are computed by this site and are not official.