Record envelope, standing records and threshold days for Grafton (USC00303360), New York, United States, with 55 years of record.
Key Facts for Grafton
Grafton (USC00303360) is a weather station in New York, United States at 42.78 latitude and -73.47 longitude, 476 m (1,560 ft) above sea level.
The station reports from 1950 to 2004, 55 years of record.
1,464 records set at Grafton still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Grafton set a daily record low maximum temperature of -1.7 C (28.9 F) on 10 November 2004.
About the Station
Location: New York, United States, 42.78 latitude, -73.47 longitude.
Elevation: 476 m (1,560 ft).
Period of record: 1950 to 2004, 55 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 Grafton. 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 Grafton, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
16.1 C (61.0 F)
-32.8 C (-27.0 F)
n/a
n/a
Feb
16.7 C (62.1 F)
-30.6 C (-23.1 F)
n/a
n/a
Mar
28.3 C (82.9 F)
-23.9 C (-11.0 F)
n/a
n/a
Apr
31.1 C (88.0 F)
-15.0 C (5.0 F)
n/a
n/a
May
31.1 C (88.0 F)
-6.1 C (21.0 F)
n/a
n/a
Jun
33.3 C (91.9 F)
0.0 C (32.0 F)
n/a
n/a
Jul
33.9 C (93.0 F)
3.9 C (39.0 F)
n/a
n/a
Aug
34.4 C (93.9 F)
0.0 C (32.0 F)
n/a
n/a
Sep
35.0 C (95.0 F)
-3.3 C (26.1 F)
n/a
n/a
Oct
28.3 C (82.9 F)
-9.4 C (15.1 F)
n/a
n/a
Nov
25.6 C (78.1 F)
-17.8 C (0.0 F)
n/a
n/a
Dec
19.4 C (66.9 F)
-30.6 C (-23.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Grafton still stand. 1979 holds the most, with 62.
Standing records at Grafton by the year they were set
Year set
Standing records
1950
7
1951
25
1952
13
1953
42
1954
32
1955
28
1956
34
1957
33
1958
23
1959
43
1960
16
1961
19
1962
28
1963
35
1964
34
1965
38
1966
27
1967
35
1968
36
1969
18
1970
24
1971
19
1972
32
1973
26
1974
25
1975
31
1976
39
1977
30
1978
29
1979
62
1980
21
1981
30
1982
23
1983
19
1984
25
1985
15
1986
17
1987
20
1988
32
1989
24
1990
40
1991
34
1992
14
1993
20
1994
24
1995
22
1996
24
1997
8
1998
30
1999
18
2000
33
2001
28
2002
31
2003
17
2004
12
All-Time Record Progression
3 new records
3 all-time records were set at Grafton between 4 October 1987 and 16 January 1994. Each dot is a new record.
When Grafton set new all-time records
Date
Kind
Detail
1987-10-04
Record daily precipitation
Record daily precipitation 120.7 mm (4.8 in)
1987-10-04
Record daily snowfall
Record daily snowfall 55.9 cm (22.0 in)
1994-01-16
Record low maximum temperature
Record low maximum temperature -21.7 C (-7.1 F)
Wettest Day of Each Month
Oct: 120.7 mm (4.8 in)
The wettest day on record for each calendar month at Grafton. The most was 120.7 mm (4.8 in) on 4 October 1987.
Record daily precipitation for each month at Grafton
Month
Record daily precipitation (mm)
Date
Jan
42.2 mm (1.7 in)
9 January 1978
Feb
66.0 mm (2.6 in)
2 February 1981
Mar
49.5 mm (1.9 in)
14 March 1977
Apr
58.7 mm (2.3 in)
25 April 1968
May
53.8 mm (2.1 in)
19 May 1976
Jun
89.4 mm (3.5 in)
29 June 1975
Jul
95.3 mm (3.8 in)
26 July 1995
Aug
100.1 mm (3.9 in)
10 August 1976
Sep
90.9 mm (3.6 in)
17 September 1999
Oct
120.7 mm (4.8 in)
4 October 1987
Nov
67.3 mm (2.6 in)
25 November 1983
Dec
65.0 mm (2.6 in)
17 December 2000
Period of Record Coverage
1950 to 2004
Complete yearUnder 90 percent of days
55 years of record at Grafton, 1950 to 2004. 4 years have data for under 90 percent of days and are left out of rankings: 1950, 1961, 2003, 2004.
Cooler than the station meanWarmer than the station mean
One stripe for each of 47 complete years at Grafton, 1951 to 2002. Blue stripes are years cooler than the station's own mean of 7.3 C (45.1 F); red stripes are warmer. The coolest year was 1978, at 6.3 C (43.3 F), and the warmest was 1998, at 8.9 C (48.0 F). The strongest colour marks a difference of 1.7 C (3.1 F).
Annual mean temperature at Grafton as warming stripes, 1951 to 2002
Year
Annual mean temperature
Difference from the station mean
1951
7.5 C
+0.17 C
1952
7.7 C
+0.39 C
1953
8.6 C
+1.35 C
1954
7.2 C
-0.09 C
1955
7.2 C
-0.13 C
1956
6.6 C
-0.67 C
1957
7.7 C
+0.44 C
1958
6.4 C
-0.85 C
1960
7.6 C
+0.29 C
1962
6.9 C
-0.43 C
1963
6.8 C
-0.48 C
1964
7.6 C
+0.29 C
1965
6.7 C
-0.59 C
1966
7.0 C
-0.28 C
1967
6.6 C
-0.65 C
1968
6.9 C
-0.40 C
1969
7.1 C
-0.16 C
1970
7.1 C
-0.19 C
1971
7.2 C
-0.07 C
1972
6.5 C
-0.74 C
1973
8.4 C
+1.10 C
1974
7.2 C
-0.10 C
1975
7.8 C
+0.52 C
1976
6.7 C
-0.62 C
1977
7.2 C
-0.12 C
1978
6.3 C
-1.01 C
1979
7.2 C
-0.11 C
1980
6.6 C
-0.71 C
1981
7.1 C
-0.19 C
1982
6.9 C
-0.37 C
1983
7.3 C
+0.01 C
1984
7.4 C
+0.14 C
1985
7.3 C
-0.02 C
1986
7.3 C
-0.02 C
1987
7.5 C
+0.17 C
1988
7.2 C
-0.05 C
1989
6.7 C
-0.57 C
1990
8.7 C
+1.44 C
1991
8.4 C
+1.13 C
1992
6.7 C
-0.56 C
1993
7.0 C
-0.32 C
1994
7.2 C
-0.11 C
1996
7.0 C
-0.24 C
1997
7.0 C
-0.27 C
1998
8.9 C
+1.61 C
1999
8.4 C
+1.07 C
2002
8.2 C
+0.92 C
The fitted trend in annual mean temperature here over 1951 to 2002 is 0.09 C (-0.04 to 0.22) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.2 F (-0.1 to 0.4) per decade. The slope is a straight line fitted to 47 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Grafton
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.09 C (-0.04 to 0.22) per decade
0.2 F (-0.1 to 0.4) per decade
1951 to 2002
47
Not clearly different from zero
Mean daily maximum
0.02 C (-0.11 to 0.15) per decade
0.03 F (-0.21 to 0.26) per decade
1951 to 2002
47
Not clearly different from zero
Mean daily minimum
0.16 C (0.03 to 0.30) per decade
0.29 F (0.05 to 0.54) per decade
1951 to 2002
47
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
1950 to 2004
Yearly extremes at Grafton: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
35.0 C (95.0 F)
1953
31.7 C (89.1 F)
55
Coldest night (TNn)
-32.8 C (-27.0 F)
1968
-26.1 C (-15.0 F)
55
Wettest day (Rx1day)
120.7 mm (4.8 in)
1987
58.4 mm (2.3 in)
55
Wettest five days (Rx5day)
176.3 mm (6.9 in)
1999
84.9 mm (3.3 in)
55
Longest dry spell (CDD)
29 days
2001
13 days
55
Hottest day (TXx)
The hottest day of the year at Grafton, 1950 to 2004. The record is 35.0 C (95.0 F) in 1953, marked on the chart; the median year is 31.7 C (89.1 F).
Hottest day (TXx) at Grafton by year
Year
Hottest day (TXx)
1950
26.7 C (80.1 F)
1951
30.6 C (87.1 F)
1952
32.2 C (90.0 F)
1953
35.0 C (95.0 F)
1954
31.1 C (88.0 F)
1955
34.4 C (93.9 F)
1956
31.1 C (88.0 F)
1957
31.1 C (88.0 F)
1958
30.0 C (86.0 F)
1959
32.2 C (90.0 F)
1960
29.4 C (84.9 F)
1961
27.8 C (82.0 F)
1962
31.1 C (88.0 F)
1963
33.3 C (91.9 F)
1964
33.9 C (93.0 F)
1965
32.8 C (91.0 F)
1966
32.2 C (90.0 F)
1967
31.1 C (88.0 F)
1968
31.7 C (89.1 F)
1969
31.7 C (89.1 F)
1970
32.2 C (90.0 F)
1971
31.7 C (89.1 F)
1972
31.1 C (88.0 F)
1973
31.7 C (89.1 F)
1974
31.7 C (89.1 F)
1975
32.8 C (91.0 F)
1976
30.6 C (87.1 F)
1977
31.7 C (89.1 F)
1978
32.2 C (90.0 F)
1979
33.3 C (91.9 F)
1980
31.1 C (88.0 F)
1981
31.1 C (88.0 F)
1982
30.6 C (87.1 F)
1983
31.7 C (89.1 F)
1984
31.1 C (88.0 F)
1985
30.0 C (86.0 F)
1986
30.6 C (87.1 F)
1987
31.7 C (89.1 F)
1988
33.3 C (91.9 F)
1989
30.0 C (86.0 F)
1990
30.6 C (87.1 F)
1991
32.8 C (91.0 F)
1992
30.0 C (86.0 F)
1993
31.7 C (89.1 F)
1994
31.7 C (89.1 F)
1995
33.9 C (93.0 F)
1996
29.4 C (84.9 F)
1997
31.7 C (89.1 F)
1998
29.4 C (84.9 F)
1999
31.7 C (89.1 F)
2000
29.4 C (84.9 F)
2001
33.3 C (91.9 F)
2002
34.4 C (93.9 F)
2003
30.6 C (87.1 F)
2004
28.9 C (84.0 F)
Coldest night (TNn)
The coldest night of the year at Grafton, 1950 to 2004. The record is -32.8 C (-27.0 F) in 1968, marked on the chart; the median year is -26.1 C (-15.0 F).
Coldest night (TNn) at Grafton by year
Year
Coldest night (TNn)
1950
-23.3 C (-9.9 F)
1951
-25.0 C (-13.0 F)
1952
-26.1 C (-15.0 F)
1953
-20.0 C (-4.0 F)
1954
-27.2 C (-17.0 F)
1955
-30.6 C (-23.1 F)
1956
-21.7 C (-7.1 F)
1957
-31.7 C (-25.1 F)
1958
-30.6 C (-23.1 F)
1959
-23.9 C (-11.0 F)
1960
-22.2 C (-8.0 F)
1961
-28.3 C (-18.9 F)
1962
-27.8 C (-18.0 F)
1963
-29.4 C (-20.9 F)
1964
-23.3 C (-9.9 F)
1965
-26.1 C (-15.0 F)
1966
-27.2 C (-17.0 F)
1967
-26.1 C (-15.0 F)
1968
-32.8 C (-27.0 F)
1969
-22.8 C (-9.0 F)
1970
-26.7 C (-16.1 F)
1971
-26.7 C (-16.1 F)
1972
-26.7 C (-16.1 F)
1973
-26.1 C (-15.0 F)
1974
-26.7 C (-16.1 F)
1975
-25.6 C (-14.1 F)
1976
-30.6 C (-23.1 F)
1977
-24.4 C (-11.9 F)
1978
-22.8 C (-9.0 F)
1979
-30.6 C (-23.1 F)
1980
-30.6 C (-23.1 F)
1981
-27.8 C (-18.0 F)
1982
-28.3 C (-18.9 F)
1983
-27.8 C (-18.0 F)
1984
-25.6 C (-14.1 F)
1985
-24.4 C (-11.9 F)
1986
-27.2 C (-17.0 F)
1987
-29.4 C (-20.9 F)
1988
-26.7 C (-16.1 F)
1989
-25.0 C (-13.0 F)
1990
-26.1 C (-15.0 F)
1991
-23.3 C (-9.9 F)
1992
-22.8 C (-9.0 F)
1993
-26.1 C (-15.0 F)
1994
-30.6 C (-23.1 F)
1995
-28.3 C (-18.9 F)
1996
-23.3 C (-9.9 F)
1997
-25.0 C (-13.0 F)
1998
-23.9 C (-11.0 F)
1999
-25.6 C (-14.1 F)
2000
-26.1 C (-15.0 F)
2001
-20.6 C (-5.1 F)
2002
-21.7 C (-7.1 F)
2003
-26.7 C (-16.1 F)
2004
-28.9 C (-20.0 F)
Wettest day (Rx1day)
The wettest day of the year at Grafton, 1950 to 2004. The record is 120.7 mm (4.8 in) in 1987, marked on the chart; the median year is 58.4 mm (2.3 in).
Wettest day (Rx1day) at Grafton by year
Year
Wettest day (Rx1day)
1950
90.2 mm (3.6 in)
1951
48.5 mm (1.9 in)
1952
57.7 mm (2.3 in)
1953
58.4 mm (2.3 in)
1954
77.0 mm (3.0 in)
1955
64.8 mm (2.6 in)
1956
49.0 mm (1.9 in)
1957
62.7 mm (2.5 in)
1958
44.2 mm (1.7 in)
1959
51.3 mm (2.0 in)
1960
58.4 mm (2.3 in)
1961
26.4 mm (1.0 in)
1962
46.7 mm (1.8 in)
1963
30.0 mm (1.2 in)
1964
39.9 mm (1.6 in)
1965
37.1 mm (1.5 in)
1966
51.8 mm (2.0 in)
1967
54.9 mm (2.2 in)
1968
58.7 mm (2.3 in)
1969
57.2 mm (2.3 in)
1970
47.0 mm (1.9 in)
1971
92.5 mm (3.6 in)
1972
78.0 mm (3.1 in)
1973
59.4 mm (2.3 in)
1974
51.1 mm (2.0 in)
1975
89.4 mm (3.5 in)
1976
100.1 mm (3.9 in)
1977
62.5 mm (2.5 in)
1978
42.2 mm (1.7 in)
1979
56.6 mm (2.2 in)
1980
61.7 mm (2.4 in)
1981
66.0 mm (2.6 in)
1982
64.3 mm (2.5 in)
1983
67.3 mm (2.6 in)
1984
66.0 mm (2.6 in)
1985
55.4 mm (2.2 in)
1986
63.5 mm (2.5 in)
1987
120.7 mm (4.8 in)
1988
51.3 mm (2.0 in)
1989
43.4 mm (1.7 in)
1990
68.8 mm (2.7 in)
1991
54.4 mm (2.1 in)
1992
51.1 mm (2.0 in)
1993
52.1 mm (2.1 in)
1994
43.2 mm (1.7 in)
1995
95.3 mm (3.8 in)
1996
75.7 mm (3.0 in)
1997
36.8 mm (1.4 in)
1998
35.1 mm (1.4 in)
1999
90.9 mm (3.6 in)
2000
65.0 mm (2.6 in)
2001
49.5 mm (1.9 in)
2002
64.0 mm (2.5 in)
2003
68.6 mm (2.7 in)
2004
70.1 mm (2.8 in)
Wettest five days (Rx5day)
The wettest five days of the year at Grafton, 1950 to 2004. The record is 176.3 mm (6.9 in) in 1999, marked on the chart; the median year is 84.9 mm (3.3 in).
Wettest five days (Rx5day) at Grafton by year
Year
Wettest five days (Rx5day)
1950
93.0 mm (3.7 in)
1951
86.6 mm (3.4 in)
1952
93.0 mm (3.7 in)
1953
94.5 mm (3.7 in)
1954
97.3 mm (3.8 in)
1955
110.2 mm (4.3 in)
1956
71.6 mm (2.8 in)
1957
77.9 mm (3.1 in)
1958
73.7 mm (2.9 in)
1959
84.9 mm (3.3 in)
1960
141.6 mm (5.6 in)
1961
44.9 mm (1.8 in)
1962
52.6 mm (2.1 in)
1963
54.8 mm (2.2 in)
1964
53.3 mm (2.1 in)
1965
57.1 mm (2.2 in)
1966
75.2 mm (3.0 in)
1967
79.4 mm (3.1 in)
1968
77.0 mm (3.0 in)
1969
119.9 mm (4.7 in)
1970
74.9 mm (2.9 in)
1971
113.1 mm (4.5 in)
1972
96.0 mm (3.8 in)
1973
103.4 mm (4.1 in)
1974
80.5 mm (3.2 in)
1975
143.8 mm (5.7 in)
1976
134.0 mm (5.3 in)
1977
86.6 mm (3.4 in)
1978
61.2 mm (2.4 in)
1979
110.9 mm (4.4 in)
1980
69.3 mm (2.7 in)
1981
74.5 mm (2.9 in)
1982
120.2 mm (4.7 in)
1983
115.8 mm (4.6 in)
1984
138.7 mm (5.5 in)
1985
66.0 mm (2.6 in)
1986
76.0 mm (3.0 in)
1987
139.3 mm (5.5 in)
1988
78.7 mm (3.1 in)
1989
76.5 mm (3.0 in)
1990
115.3 mm (4.5 in)
1991
76.5 mm (3.0 in)
1992
72.7 mm (2.9 in)
1993
84.6 mm (3.3 in)
1994
62.3 mm (2.5 in)
1995
116.9 mm (4.6 in)
1996
102.2 mm (4.0 in)
1997
62.4 mm (2.5 in)
1998
94.4 mm (3.7 in)
1999
176.3 mm (6.9 in)
2000
103.0 mm (4.1 in)
2001
68.1 mm (2.7 in)
2002
71.4 mm (2.8 in)
2003
116.3 mm (4.6 in)
2004
94.0 mm (3.7 in)
Longest dry spell (CDD)
The longest dry spell of the year at Grafton, 1950 to 2004. The record is 29 days in 2001, marked on the chart; the median year is 13 days.
Longest dry spell (CDD) at Grafton by year
Year
Longest dry spell (CDD)
1950
11 days
1951
13 days
1952
24 days
1953
25 days
1954
14 days
1955
15 days
1956
15 days
1957
17 days
1958
16 days
1959
12 days
1960
14 days
1961
13 days
1962
16 days
1963
24 days
1964
24 days
1965
9 days
1966
13 days
1967
12 days
1968
19 days
1969
13 days
1970
13 days
1971
13 days
1972
11 days
1973
15 days
1974
11 days
1975
11 days
1976
18 days
1977
14 days
1978
13 days
1979
12 days
1980
19 days
1981
11 days
1982
12 days
1983
12 days
1984
15 days
1985
12 days
1986
12 days
1987
19 days
1988
11 days
1989
11 days
1990
13 days
1991
16 days
1992
12 days
1993
12 days
1994
13 days
1995
15 days
1996
12 days
1997
13 days
1998
12 days
1999
19 days
2000
11 days
2001
29 days
2002
11 days
2003
14 days
2004
10 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
47 years with a frost
Across 47 years with a frost, the median last spring frost at Grafton falls on 10 May and the median first autumn frost on 4 October, which leaves a median of 146 days between them.
Fitted over all years, the growing season changes by +0.7 days per decade at this station.
Frost dates and growing season at Grafton
Measure
Median, all years
Earliest period
Recent period (1970 to 2002)
Recent against earliest
Fitted trend
Last spring frost
10 May
n/a
8 May
n/a
-1.1 days per decade
First autumn frost
4 October
n/a
4 October
n/a
-0.4 days per decade
Growing days
146 days
n/a
146 days
n/a
+0.7 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
52 years, 1951 to 2003
A day with at least 57.1 mm (2.2 in) of rain is expected about once in 2 years. A day with at least 118.2 mm (4.7 in) of rain is expected about once in 100 years.
Rainfall return levels at Grafton: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
57.1 mm (2.2 in)
5 years
72.7 mm (2.9 in)
10 years
83.3 mm (3.3 in)
25 years
97.1 mm (3.8 in)
50 years
107.6 mm (4.2 in)
100 years
118.2 mm (4.7 in)
Longer than the 52 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, 52 years of values from 1951 to 2003.
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: 120.7 mm (4.8 in) in 1987; 100.1 mm (3.9 in) in 1976; 95.3 mm (3.8 in) in 1995.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Grafton, at 1996. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1996 ran 0.3 C (0.5 F) lower than in the years before (possible change).
Suspected changes in the annual mean temperature at Grafton, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1996
-0.2
-0.4
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 Grafton standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Grafton 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.