Record envelope, standing records and threshold days for Rochester (USC00436893), Vermont, United States, with 93 years of record.
Key Facts for Rochester
Rochester (USC00436893) is a weather station in Vermont, United States at 43.86 latitude and -72.80 longitude, 253 m (830 ft) above sea level.
The station reports from 1928 to 2020, 93 years of record.
1,464 records set at Rochester still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Rochester tied a daily record high maximum temperature of 30.6 C (87.1 F) on 24 August 2020.
About the Station
Location: Vermont, United States, 43.86 latitude, -72.80 longitude.
Elevation: 253 m (830 ft).
Period of record: 1928 to 2020, 93 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 Rochester. 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 Rochester, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
17.8 C (64.0 F)
-35.6 C (-32.1 F)
n/a
n/a
Feb
21.1 C (70.0 F)
-33.3 C (-27.9 F)
n/a
n/a
Mar
27.8 C (82.0 F)
-29.4 C (-20.9 F)
n/a
n/a
Apr
32.8 C (91.0 F)
-17.2 C (1.0 F)
n/a
n/a
May
33.3 C (91.9 F)
-6.1 C (21.0 F)
n/a
n/a
Jun
35.0 C (95.0 F)
-1.1 C (30.0 F)
n/a
n/a
Jul
35.0 C (95.0 F)
1.7 C (35.1 F)
n/a
n/a
Aug
36.7 C (98.1 F)
0.6 C (33.1 F)
n/a
n/a
Sep
35.0 C (95.0 F)
-5.0 C (23.0 F)
n/a
n/a
Oct
28.9 C (84.0 F)
-12.8 C (9.0 F)
n/a
n/a
Nov
23.9 C (75.0 F)
-18.9 C (-2.0 F)
n/a
n/a
Dec
20.0 C (68.0 F)
-34.4 C (-29.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Rochester still stand. 1979 holds the most, with 58.
Standing records at Rochester by the year they were set
Year set
Standing records
1964
15
1965
36
1966
37
1967
41
1968
44
1969
33
1970
27
1971
47
1972
34
1973
24
1974
31
1975
28
1976
37
1977
28
1978
18
1979
58
1980
16
1981
28
1982
28
1983
19
1984
23
1985
19
1986
22
1987
28
1988
47
1989
53
1990
29
1991
27
1992
30
1993
31
1994
20
1995
10
1996
10
1997
11
1998
17
1999
26
2000
18
2001
15
2002
42
2003
18
2004
14
2005
29
2006
13
2007
27
2008
16
2009
18
2010
16
2011
14
2012
24
2013
23
2014
13
2015
18
2016
21
2017
41
2018
19
2019
19
2020
14
All-Time Record Progression
6 new records
6 all-time records were set at Rochester between 27 December 1969 and 29 August 2011. Each dot is a new record.
When Rochester set new all-time records
Date
Kind
Detail
1969-12-27
Record daily snowfall
Record daily snowfall 50.8 cm (20.0 in)
1978-02-07
Record daily snowfall
Record daily snowfall 58.4 cm (23.0 in)
1984-03-14
Record daily snowfall
Record daily snowfall 76.2 cm (30.0 in)
1999-09-16
Record daily precipitation
Record daily precipitation 135.4 mm (5.3 in)
2002-07-22
Record high minimum temperature
Record high minimum temperature 22.2 C (72.0 F)
2011-08-29
Record daily precipitation
Record daily precipitation 151.4 mm (6.0 in)
Wettest Day of Each Month
Aug: 151.4 mm (6.0 in)
The wettest day on record for each calendar month at Rochester. The most was 151.4 mm (6.0 in) on 29 August 2011.
Record daily precipitation for each month at Rochester
Month
Record daily precipitation (mm)
Date
Jan
54.6 mm (2.1 in)
22 January 1959
Feb
67.3 mm (2.6 in)
8 February 1941
Mar
67.3 mm (2.6 in)
7 March 2011
Apr
87.1 mm (3.4 in)
29 April 1988
May
89.7 mm (3.5 in)
30 May 1984
Jun
95.5 mm (3.8 in)
3 June 1947
Jul
94.0 mm (3.7 in)
18 July 1938
Aug
151.4 mm (6.0 in)
29 August 2011
Sep
135.4 mm (5.3 in)
16 September 1999
Oct
80.8 mm (3.2 in)
21 October 1996
Nov
69.9 mm (2.8 in)
9 November 1972
Dec
77.5 mm (3.1 in)
17 December 2000
Period of Record Coverage
1964 to 2020
Complete yearUnder 90 percent of days
57 years of record at Rochester, 1964 to 2020. 11 years have data for under 90 percent of days and are left out of rankings: 1964, 1965, 1995, 1996, 2005, 2007, 2014, 2015 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 43 complete years at Rochester, 1966 to 2017. Blue stripes are years cooler than the station's own mean of 6.3 C (43.4 F); red stripes are warmer. The coolest year was 1972, at 4.9 C (40.7 F), and the warmest was 2012, at 8.1 C (46.6 F). The strongest colour marks a difference of 1.8 C (3.2 F).
Annual mean temperature at Rochester as warming stripes, 1966 to 2017
Year
Annual mean temperature
Difference from the station mean
1966
5.8 C
-0.50 C
1967
5.6 C
-0.74 C
1968
5.6 C
-0.75 C
1969
5.8 C
-0.58 C
1970
5.5 C
-0.84 C
1971
5.3 C
-1.04 C
1972
4.9 C
-1.48 C
1974
5.7 C
-0.63 C
1975
6.3 C
-0.04 C
1976
5.5 C
-0.84 C
1977
6.2 C
-0.17 C
1978
5.2 C
-1.16 C
1979
6.6 C
+0.22 C
1980
5.5 C
-0.82 C
1981
6.5 C
+0.17 C
1982
6.0 C
-0.30 C
1983
6.9 C
+0.51 C
1984
6.7 C
+0.31 C
1985
6.2 C
-0.18 C
1986
6.0 C
-0.33 C
1987
6.2 C
-0.19 C
1988
5.2 C
-1.14 C
1990
7.5 C
+1.13 C
1991
7.1 C
+0.72 C
1992
5.3 C
-1.03 C
1993
5.6 C
-0.73 C
1997
5.8 C
-0.56 C
1998
8.1 C
+1.77 C
1999
7.2 C
+0.89 C
2000
6.2 C
-0.13 C
2001
7.1 C
+0.77 C
2002
6.9 C
+0.51 C
2003
5.8 C
-0.58 C
2004
6.2 C
-0.13 C
2006
7.9 C
+1.53 C
2008
6.5 C
+0.17 C
2009
6.2 C
-0.17 C
2010
7.5 C
+1.17 C
2011
7.3 C
+0.95 C
2012
8.1 C
+1.78 C
2013
6.7 C
+0.33 C
2016
7.5 C
+1.16 C
2017
7.1 C
+0.78 C
The annual mean temperature here has risen by 0.4 C (0.2 to 0.5) per decade over 1966 to 2017. In Fahrenheit: 0.6 F (0.4 to 0.9) per decade. The slope is a straight line fitted to 43 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Rochester
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.4 C (0.2 to 0.5) per decade
0.6 F (0.4 to 0.9) per decade
1966 to 2017
43
Rise
Mean daily maximum
0.2 C (0.1 to 0.3) per decade
0.3 F (0.1 to 0.6) per decade
1966 to 2017
43
Rise
Mean daily minimum
0.5 C (0.4 to 0.7) per decade
1.0 F (0.7 to 1.2) per decade
1966 to 2017
43
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
1928 to 2020
Yearly extremes at Rochester: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
36.7 C (98.1 F)
1975
32.8 C (91.0 F)
57
Coldest night (TNn)
-35.6 C (-32.1 F)
1994
-29.4 C (-20.9 F)
57
Wettest day (Rx1day)
151.4 mm (6.0 in)
2011
55.1 mm (2.2 in)
93
Wettest five days (Rx5day)
173.0 mm (6.8 in)
2011
86.0 mm (3.4 in)
92
Longest dry spell (CDD)
28 days
2004
15 days
93
Hottest day (TXx)
The hottest day of the year at Rochester, 1928 to 2020. The record is 36.7 C (98.1 F) in 1975, marked on the chart; the median year is 32.8 C (91.0 F).
Hottest day (TXx) at Rochester by year
Year
Hottest day (TXx)
1928
n/a
1929
n/a
1930
n/a
1931
n/a
1932
n/a
1933
n/a
1934
n/a
1935
n/a
1936
n/a
1937
n/a
1938
n/a
1939
n/a
1940
n/a
1941
n/a
1942
n/a
1943
n/a
1944
n/a
1945
n/a
1946
n/a
1947
n/a
1948
n/a
1949
n/a
1950
n/a
1951
n/a
1952
n/a
1953
n/a
1954
n/a
1955
n/a
1956
n/a
1957
n/a
1958
n/a
1959
n/a
1960
n/a
1961
n/a
1962
n/a
1963
n/a
1964
30.0 C (86.0 F)
1965
32.8 C (91.0 F)
1966
35.0 C (95.0 F)
1967
31.1 C (88.0 F)
1968
33.3 C (91.9 F)
1969
33.3 C (91.9 F)
1970
32.8 C (91.0 F)
1971
33.3 C (91.9 F)
1972
31.7 C (89.1 F)
1973
33.3 C (91.9 F)
1974
32.8 C (91.0 F)
1975
36.7 C (98.1 F)
1976
32.8 C (91.0 F)
1977
35.0 C (95.0 F)
1978
33.3 C (91.9 F)
1979
35.0 C (95.0 F)
1980
31.7 C (89.1 F)
1981
33.3 C (91.9 F)
1982
32.8 C (91.0 F)
1983
33.9 C (93.0 F)
1984
32.2 C (90.0 F)
1985
31.1 C (88.0 F)
1986
31.7 C (89.1 F)
1987
32.8 C (91.0 F)
1988
35.0 C (95.0 F)
1989
30.6 C (87.1 F)
1990
32.8 C (91.0 F)
1991
32.2 C (90.0 F)
1992
31.7 C (89.1 F)
1993
32.8 C (91.0 F)
1994
33.9 C (93.0 F)
1995
28.9 C (84.0 F)
1996
30.6 C (87.1 F)
1997
31.7 C (89.1 F)
1998
31.7 C (89.1 F)
1999
34.4 C (93.9 F)
2000
31.1 C (88.0 F)
2001
34.4 C (93.9 F)
2002
35.0 C (95.0 F)
2003
35.0 C (95.0 F)
2004
30.6 C (87.1 F)
2005
32.8 C (91.0 F)
2006
32.8 C (91.0 F)
2007
32.8 C (91.0 F)
2008
32.8 C (91.0 F)
2009
32.2 C (90.0 F)
2010
33.3 C (91.9 F)
2011
33.3 C (91.9 F)
2012
32.8 C (91.0 F)
2013
32.2 C (90.0 F)
2014
12.2 C (54.0 F)
2015
32.2 C (90.0 F)
2016
32.2 C (90.0 F)
2017
32.8 C (91.0 F)
2018
34.4 C (93.9 F)
2019
33.3 C (91.9 F)
2020
33.9 C (93.0 F)
Coldest night (TNn)
The coldest night of the year at Rochester, 1928 to 2020. The record is -35.6 C (-32.1 F) in 1994, marked on the chart; the median year is -29.4 C (-20.9 F).
Coldest night (TNn) at Rochester by year
Year
Coldest night (TNn)
1928
n/a
1929
n/a
1930
n/a
1931
n/a
1932
n/a
1933
n/a
1934
n/a
1935
n/a
1936
n/a
1937
n/a
1938
n/a
1939
n/a
1940
n/a
1941
n/a
1942
n/a
1943
n/a
1944
n/a
1945
n/a
1946
n/a
1947
n/a
1948
n/a
1949
n/a
1950
n/a
1951
n/a
1952
n/a
1953
n/a
1954
n/a
1955
n/a
1956
n/a
1957
n/a
1958
n/a
1959
n/a
1960
n/a
1961
n/a
1962
n/a
1963
n/a
1964
-23.9 C (-11.0 F)
1965
-28.3 C (-18.9 F)
1966
-30.0 C (-22.0 F)
1967
-32.2 C (-26.0 F)
1968
-33.9 C (-29.0 F)
1969
-30.0 C (-22.0 F)
1970
-30.0 C (-22.0 F)
1971
-33.9 C (-29.0 F)
1972
-29.4 C (-20.9 F)
1973
-30.0 C (-22.0 F)
1974
-31.7 C (-25.1 F)
1975
-32.2 C (-26.0 F)
1976
-34.4 C (-29.9 F)
1977
-27.8 C (-18.0 F)
1978
-30.6 C (-23.1 F)
1979
-33.3 C (-27.9 F)
1980
-34.4 C (-29.9 F)
1981
-31.7 C (-25.1 F)
1982
-31.7 C (-25.1 F)
1983
-28.9 C (-20.0 F)
1984
-33.3 C (-27.9 F)
1985
-26.1 C (-15.0 F)
1986
-25.6 C (-14.1 F)
1987
-32.2 C (-26.0 F)
1988
-28.9 C (-20.0 F)
1989
-30.6 C (-23.1 F)
1990
-22.2 C (-8.0 F)
1991
-23.9 C (-11.0 F)
1992
-25.6 C (-14.1 F)
1993
-33.3 C (-27.9 F)
1994
-35.6 C (-32.1 F)
1995
-23.3 C (-9.9 F)
1996
-22.8 C (-9.0 F)
1997
-30.6 C (-23.1 F)
1998
-28.3 C (-18.9 F)
1999
-27.8 C (-18.0 F)
2000
-27.2 C (-17.0 F)
2001
-21.1 C (-6.0 F)
2002
-21.1 C (-6.0 F)
2003
-31.1 C (-24.0 F)
2004
-29.4 C (-20.9 F)
2005
-29.4 C (-20.9 F)
2006
-21.7 C (-7.1 F)
2007
-29.4 C (-20.9 F)
2008
-26.7 C (-16.1 F)
2009
-30.6 C (-23.1 F)
2010
-21.7 C (-7.1 F)
2011
-30.0 C (-22.0 F)
2012
-26.1 C (-15.0 F)
2013
-27.2 C (-17.0 F)
2014
-27.2 C (-17.0 F)
2015
-8.9 C (16.0 F)
2016
-27.2 C (-17.0 F)
2017
-27.8 C (-18.0 F)
2018
-30.0 C (-22.0 F)
2019
-25.0 C (-13.0 F)
2020
-28.9 C (-20.0 F)
Wettest day (Rx1day)
The wettest day of the year at Rochester, 1928 to 2020. The record is 151.4 mm (6.0 in) in 2011, marked on the chart; the median year is 55.1 mm (2.2 in).
Wettest day (Rx1day) at Rochester by year
Year
Wettest day (Rx1day)
1928
25.1 mm (1.0 in)
1929
39.4 mm (1.6 in)
1930
42.4 mm (1.7 in)
1931
42.7 mm (1.7 in)
1932
63.5 mm (2.5 in)
1933
50.8 mm (2.0 in)
1934
38.1 mm (1.5 in)
1935
51.3 mm (2.0 in)
1936
50.8 mm (2.0 in)
1937
71.9 mm (2.8 in)
1938
94.0 mm (3.7 in)
1939
48.8 mm (1.9 in)
1940
87.6 mm (3.4 in)
1941
67.3 mm (2.6 in)
1942
42.2 mm (1.7 in)
1943
58.4 mm (2.3 in)
1944
48.3 mm (1.9 in)
1945
80.0 mm (3.1 in)
1946
52.1 mm (2.1 in)
1947
95.5 mm (3.8 in)
1948
73.2 mm (2.9 in)
1949
39.4 mm (1.6 in)
1950
55.1 mm (2.2 in)
1951
40.1 mm (1.6 in)
1952
83.8 mm (3.3 in)
1953
78.2 mm (3.1 in)
1954
50.8 mm (2.0 in)
1955
61.7 mm (2.4 in)
1956
51.3 mm (2.0 in)
1957
43.2 mm (1.7 in)
1958
36.6 mm (1.4 in)
1959
69.3 mm (2.7 in)
1960
74.2 mm (2.9 in)
1961
34.8 mm (1.4 in)
1962
44.5 mm (1.8 in)
1963
50.8 mm (2.0 in)
1964
72.4 mm (2.9 in)
1965
38.4 mm (1.5 in)
1966
58.2 mm (2.3 in)
1967
49.3 mm (1.9 in)
1968
57.9 mm (2.3 in)
1969
62.0 mm (2.4 in)
1970
63.8 mm (2.5 in)
1971
45.7 mm (1.8 in)
1972
69.9 mm (2.8 in)
1973
89.4 mm (3.5 in)
1974
66.5 mm (2.6 in)
1975
53.8 mm (2.1 in)
1976
52.8 mm (2.1 in)
1977
65.0 mm (2.6 in)
1978
43.2 mm (1.7 in)
1979
49.5 mm (1.9 in)
1980
52.3 mm (2.1 in)
1981
56.1 mm (2.2 in)
1982
56.6 mm (2.2 in)
1983
60.5 mm (2.4 in)
1984
89.7 mm (3.5 in)
1985
51.3 mm (2.0 in)
1986
47.0 mm (1.9 in)
1987
86.9 mm (3.4 in)
1988
87.1 mm (3.4 in)
1989
83.8 mm (3.3 in)
1990
81.3 mm (3.2 in)
1991
54.1 mm (2.1 in)
1992
52.1 mm (2.1 in)
1993
45.7 mm (1.8 in)
1994
48.3 mm (1.9 in)
1995
61.5 mm (2.4 in)
1996
91.4 mm (3.6 in)
1997
45.0 mm (1.8 in)
1998
71.1 mm (2.8 in)
1999
135.4 mm (5.3 in)
2000
94.0 mm (3.7 in)
2001
39.4 mm (1.6 in)
2002
63.0 mm (2.5 in)
2003
52.1 mm (2.1 in)
2004
56.9 mm (2.2 in)
2005
46.5 mm (1.8 in)
2006
74.2 mm (2.9 in)
2007
63.0 mm (2.5 in)
2008
70.1 mm (2.8 in)
2009
65.5 mm (2.6 in)
2010
72.6 mm (2.9 in)
2011
151.4 mm (6.0 in)
2012
72.4 mm (2.9 in)
2013
47.0 mm (1.9 in)
2014
49.0 mm (1.9 in)
2015
46.7 mm (1.8 in)
2016
57.7 mm (2.3 in)
2017
47.5 mm (1.9 in)
2018
45.2 mm (1.8 in)
2019
0.0 mm (0.00 in)
2020
0.0 mm (0.00 in)
Wettest five days (Rx5day)
The wettest five days of the year at Rochester, 1928 to 2020. The record is 173.0 mm (6.8 in) in 2011, marked on the chart; the median year is 86.0 mm (3.4 in).
Wettest five days (Rx5day) at Rochester by year
Year
Wettest five days (Rx5day)
1928
43.1 mm (1.7 in)
1929
83.6 mm (3.3 in)
1930
78.0 mm (3.1 in)
1931
65.9 mm (2.6 in)
1932
83.8 mm (3.3 in)
1933
74.2 mm (2.9 in)
1934
59.2 mm (2.3 in)
1935
69.8 mm (2.7 in)
1936
78.6 mm (3.1 in)
1937
112.1 mm (4.4 in)
1938
140.5 mm (5.5 in)
1939
58.2 mm (2.3 in)
1940
100.5 mm (4.0 in)
1941
74.7 mm (2.9 in)
1942
54.6 mm (2.1 in)
1943
76.2 mm (3.0 in)
1944
58.9 mm (2.3 in)
1945
106.0 mm (4.2 in)
1946
92.7 mm (3.6 in)
1947
122.4 mm (4.8 in)
1948
120.2 mm (4.7 in)
1949
130.9 mm (5.2 in)
1950
90.1 mm (3.5 in)
1951
60.4 mm (2.4 in)
1952
89.9 mm (3.5 in)
1953
81.1 mm (3.2 in)
1954
91.2 mm (3.6 in)
1955
76.8 mm (3.0 in)
1956
72.6 mm (2.9 in)
1957
93.0 mm (3.7 in)
1958
72.9 mm (2.9 in)
1959
106.7 mm (4.2 in)
1960
106.4 mm (4.2 in)
1961
59.6 mm (2.3 in)
1962
89.7 mm (3.5 in)
1963
78.3 mm (3.1 in)
1964
104.7 mm (4.1 in)
1965
53.4 mm (2.1 in)
1966
76.5 mm (3.0 in)
1967
62.0 mm (2.4 in)
1968
65.1 mm (2.6 in)
1969
94.7 mm (3.7 in)
1970
74.0 mm (2.9 in)
1971
79.8 mm (3.1 in)
1972
86.1 mm (3.4 in)
1973
163.1 mm (6.4 in)
1974
82.5 mm (3.2 in)
1975
85.9 mm (3.4 in)
1976
103.6 mm (4.1 in)
1977
82.8 mm (3.3 in)
1978
63.3 mm (2.5 in)
1979
122.6 mm (4.8 in)
1980
71.4 mm (2.8 in)
1981
121.8 mm (4.8 in)
1982
61.7 mm (2.4 in)
1983
102.1 mm (4.0 in)
1984
161.6 mm (6.4 in)
1985
74.5 mm (2.9 in)
1986
85.0 mm (3.3 in)
1987
103.4 mm (4.1 in)
1988
106.5 mm (4.2 in)
1989
94.2 mm (3.7 in)
1990
121.6 mm (4.8 in)
1991
73.3 mm (2.9 in)
1992
88.8 mm (3.5 in)
1993
54.2 mm (2.1 in)
1994
111.3 mm (4.4 in)
1995
84.9 mm (3.3 in)
1996
116.9 mm (4.6 in)
1997
68.3 mm (2.7 in)
1998
123.9 mm (4.9 in)
1999
151.5 mm (6.0 in)
2000
137.7 mm (5.4 in)
2001
62.0 mm (2.4 in)
2002
87.6 mm (3.4 in)
2003
97.0 mm (3.8 in)
2004
97.5 mm (3.8 in)
2005
97.8 mm (3.9 in)
2006
99.9 mm (3.9 in)
2007
88.4 mm (3.5 in)
2008
144.8 mm (5.7 in)
2009
96.5 mm (3.8 in)
2010
134.5 mm (5.3 in)
2011
173.0 mm (6.8 in)
2012
79.3 mm (3.1 in)
2013
87.9 mm (3.5 in)
2014
73.3 mm (2.9 in)
2015
68.8 mm (2.7 in)
2016
72.1 mm (2.8 in)
2017
98.0 mm (3.9 in)
2018
53.4 mm (2.1 in)
2019
0.0 mm (0.00 in)
2020
n/a
Longest dry spell (CDD)
The longest dry spell of the year at Rochester, 1928 to 2020. The record is 28 days in 2004, marked on the chart; the median year is 15 days.
Longest dry spell (CDD) at Rochester by year
Year
Longest dry spell (CDD)
1928
16 days
1929
9 days
1930
15 days
1931
15 days
1932
19 days
1933
13 days
1934
18 days
1935
15 days
1936
14 days
1937
13 days
1938
22 days
1939
26 days
1940
15 days
1941
24 days
1942
16 days
1943
18 days
1944
16 days
1945
11 days
1946
21 days
1947
16 days
1948
19 days
1949
12 days
1950
15 days
1951
15 days
1952
15 days
1953
17 days
1954
13 days
1955
12 days
1956
23 days
1957
16 days
1958
20 days
1959
14 days
1960
20 days
1961
17 days
1962
14 days
1963
19 days
1964
13 days
1965
11 days
1966
16 days
1967
12 days
1968
21 days
1969
20 days
1970
17 days
1971
12 days
1972
13 days
1973
12 days
1974
16 days
1975
13 days
1976
20 days
1977
14 days
1978
17 days
1979
15 days
1980
22 days
1981
13 days
1982
15 days
1983
10 days
1984
14 days
1985
14 days
1986
13 days
1987
23 days
1988
16 days
1989
14 days
1990
15 days
1991
17 days
1992
11 days
1993
14 days
1994
14 days
1995
10 days
1996
11 days
1997
13 days
1998
18 days
1999
16 days
2000
19 days
2001
14 days
2002
12 days
2003
25 days
2004
28 days
2005
12 days
2006
20 days
2007
16 days
2008
18 days
2009
13 days
2010
15 days
2011
15 days
2012
21 days
2013
18 days
2014
16 days
2015
14 days
2016
15 days
2017
19 days
2018
12 days
2019
7 days
2020
1 day
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
43 years with a frost
Across 43 years with a frost, the median last spring frost at Rochester falls on 19 May and the median first autumn frost on 30 September, which leaves a median of 135 days between them.
Fitted over all years, the growing season changes by +5.8 days per decade at this station.
Frost dates and growing season at Rochester
Measure
Median, all years
Earliest period
Recent period (1980 to 2017)
Recent against earliest
Fitted trend
Last spring frost
19 May
n/a
19 May
n/a
-2.8 days per decade
First autumn frost
30 September
n/a
4 October
n/a
+3.0 days per decade
Growing days
135 days
n/a
137 days
n/a
+5.8 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
85 years, 1929 to 2017
A day with at least 57.7 mm (2.3 in) of rain is expected about once in 2 years. A day with at least 134.5 mm (5.3 in) of rain is expected about once in 100 years.
Rainfall return levels at Rochester: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
57.7 mm (2.3 in)
5 years
74.7 mm (2.9 in)
10 years
87.2 mm (3.4 in)
25 years
104.7 mm (4.1 in)
50 years
119.0 mm (4.7 in)
100 years
134.5 mm (5.3 in)
Longer than the 85 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, 85 years of values from 1929 to 2017.
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: 151.4 mm (6.0 in) in 2011; 135.4 mm (5.3 in) in 1999; 95.5 mm (3.8 in) in 1947.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Rochester standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Rochester 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.