Record envelope, standing records and threshold days for Wellesley Island (USC00309055), New York, United States, with 32 years of record.
Key Facts for Wellesley Island
Wellesley Island (USC00309055) is a weather station in New York, United States at 44.36 latitude and -75.93 longitude, 87 m (285 ft) above sea level.
The station reports from 1974 to 2005, 32 years of record.
1,464 records set at Wellesley Island still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
Wellesley Island set a daily record precipitation of 11.7 mm (0.5 in) on 1 May 2005.
About the Station
Location: New York, United States, 44.36 latitude, -75.93 longitude.
Elevation: 87 m (285 ft).
Period of record: 1974 to 2005, 32 years.
Eligible elements: prcp.
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 Wellesley Island. 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 Wellesley Island, 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)
-38.9 C (-38.0 F)
n/a
n/a
Feb
17.2 C (63.0 F)
-37.2 C (-35.0 F)
n/a
n/a
Mar
24.4 C (75.9 F)
-28.9 C (-20.0 F)
n/a
n/a
Apr
30.6 C (87.1 F)
-13.3 C (8.1 F)
n/a
n/a
May
30.6 C (87.1 F)
-6.1 C (21.0 F)
n/a
n/a
Jun
36.7 C (98.1 F)
-1.1 C (30.0 F)
n/a
n/a
Jul
34.4 C (93.9 F)
3.3 C (37.9 F)
n/a
n/a
Aug
36.1 C (97.0 F)
1.7 C (35.1 F)
n/a
n/a
Sep
31.7 C (89.1 F)
-3.9 C (25.0 F)
n/a
n/a
Oct
27.8 C (82.0 F)
-8.3 C (17.1 F)
n/a
n/a
Nov
23.3 C (73.9 F)
-14.4 C (6.1 F)
n/a
n/a
Dec
18.3 C (64.9 F)
-32.8 C (-27.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Wellesley Island still stand. 1979 holds the most, with 103.
Standing records at Wellesley Island by the year they were set
Year set
Standing records
1974
31
1975
61
1976
82
1977
77
1978
67
1979
103
1980
52
1981
66
1982
73
1983
95
1984
59
1985
37
1986
49
1987
49
1988
62
1989
77
1990
54
1991
49
1992
58
1993
61
1994
47
1995
33
1996
33
1997
29
1998
1
2004
28
2005
31
Wettest Day of Each Month
Sep: 127.0 mm (5.0 in)
The wettest day on record for each calendar month at Wellesley Island. The most was 127.0 mm (5.0 in) on 14 September 1979.
Record daily precipitation for each month at Wellesley Island
Month
Record daily precipitation (mm)
Date
Jan
44.5 mm (1.8 in)
26 January 1978
Feb
38.1 mm (1.5 in)
21 February 1996
Mar
59.7 mm (2.4 in)
4 March 1999
Apr
46.5 mm (1.8 in)
9 April 1980
May
43.7 mm (1.7 in)
25 May 2003
Jun
53.3 mm (2.1 in)
7 June 1996
Jul
68.6 mm (2.7 in)
25 July 2003
Aug
67.1 mm (2.6 in)
1 August 1983
Sep
127.0 mm (5.0 in)
14 September 1979
Oct
58.4 mm (2.3 in)
21 October 1995
Nov
62.7 mm (2.5 in)
26 November 1979
Dec
41.1 mm (1.6 in)
25 December 1979
Period of Record Coverage
1974 to 2005
Complete yearUnder 90 percent of days
27 years of record at Wellesley Island, 1974 to 2005. 9 years have data for under 90 percent of days and are left out of rankings: 1974, 1991, 1994, 1995, 1996, 1997, 1998, 2004 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 21 complete years at Wellesley Island, 1975 to 1997. 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 1992, at 5.9 C (42.7 F), and the warmest was 1983, at 8.5 C (47.2 F). The strongest colour marks a difference of 1.4 C (2.5 F).
Annual mean temperature at Wellesley Island as warming stripes, 1975 to 1997
Year
Annual mean temperature
Difference from the station mean
1975
8.0 C
+0.75 C
1976
6.5 C
-0.79 C
1977
6.9 C
-0.36 C
1978
6.0 C
-1.24 C
1979
7.0 C
-0.26 C
1980
6.5 C
-0.75 C
1981
7.8 C
+0.49 C
1982
7.4 C
+0.11 C
1983
8.5 C
+1.21 C
1984
7.9 C
+0.65 C
1985
7.3 C
+0.03 C
1986
7.5 C
+0.24 C
1987
8.3 C
+1.08 C
1988
7.6 C
+0.33 C
1989
6.5 C
-0.75 C
1990
8.2 C
+0.97 C
1992
5.9 C
-1.32 C
1993
6.2 C
-1.07 C
1994
7.2 C
-0.04 C
1996
7.6 C
+0.35 C
1997
7.6 C
+0.33 C
This station does not have enough complete years (30 are needed) to fit a temperature trend.
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
1974 to 2005
Yearly extremes at Wellesley Island: 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)
1997
32.8 C (91.0 F)
27
Coldest night (TNn)
-38.9 C (-38.0 F)
1981
-29.4 C (-20.9 F)
27
Wettest day (Rx1day)
127.0 mm (5.0 in)
1979
49.3 mm (1.9 in)
32
Wettest five days (Rx5day)
136.1 mm (5.4 in)
1979
80.1 mm (3.2 in)
32
Longest dry spell (CDD)
23 days
1993
16 days
32
Hottest day (TXx)
The hottest day of the year at Wellesley Island, 1974 to 2005. The record is 36.7 C (98.1 F) in 1997, marked on the chart; the median year is 32.8 C (91.0 F).
Hottest day (TXx) at Wellesley Island by year
Year
Hottest day (TXx)
1974
32.8 C (91.0 F)
1975
33.9 C (93.0 F)
1976
31.7 C (89.1 F)
1977
32.8 C (91.0 F)
1978
33.9 C (93.0 F)
1979
33.9 C (93.0 F)
1980
31.1 C (88.0 F)
1981
31.1 C (88.0 F)
1982
32.2 C (90.0 F)
1983
34.4 C (93.9 F)
1984
33.3 C (91.9 F)
1985
32.2 C (90.0 F)
1986
31.7 C (89.1 F)
1987
33.3 C (91.9 F)
1988
35.6 C (96.1 F)
1989
33.3 C (91.9 F)
1990
32.2 C (90.0 F)
1991
31.7 C (89.1 F)
1992
29.4 C (84.9 F)
1993
31.7 C (89.1 F)
1994
33.9 C (93.0 F)
1995
33.9 C (93.0 F)
1996
36.1 C (97.0 F)
1997
36.7 C (98.1 F)
1998
7.8 C (46.0 F)
1999
n/a
2000
n/a
2001
n/a
2002
n/a
2003
n/a
2004
32.2 C (90.0 F)
2005
33.9 C (93.0 F)
Coldest night (TNn)
The coldest night of the year at Wellesley Island, 1974 to 2005. The record is -38.9 C (-38.0 F) in 1981, marked on the chart; the median year is -29.4 C (-20.9 F).
Coldest night (TNn) at Wellesley Island by year
Year
Coldest night (TNn)
1974
-15.0 C (5.0 F)
1975
-30.0 C (-22.0 F)
1976
-33.3 C (-27.9 F)
1977
-34.4 C (-29.9 F)
1978
-30.0 C (-22.0 F)
1979
-37.2 C (-35.0 F)
1980
-32.2 C (-26.0 F)
1981
-38.9 C (-38.0 F)
1982
-33.9 C (-29.0 F)
1983
-24.4 C (-11.9 F)
1984
-32.2 C (-26.0 F)
1985
-29.4 C (-20.9 F)
1986
-27.8 C (-18.0 F)
1987
-28.9 C (-20.0 F)
1988
-28.3 C (-18.9 F)
1989
-32.8 C (-27.0 F)
1990
-25.0 C (-13.0 F)
1991
-26.7 C (-16.1 F)
1992
-28.9 C (-20.0 F)
1993
-32.8 C (-27.0 F)
1994
-35.0 C (-31.0 F)
1995
-26.7 C (-16.1 F)
1996
-29.4 C (-20.9 F)
1997
-26.1 C (-15.0 F)
1998
-25.0 C (-13.0 F)
1999
n/a
2000
n/a
2001
n/a
2002
n/a
2003
n/a
2004
-27.2 C (-17.0 F)
2005
-25.6 C (-14.1 F)
Wettest day (Rx1day)
The wettest day of the year at Wellesley Island, 1974 to 2005. The record is 127.0 mm (5.0 in) in 1979, marked on the chart; the median year is 49.3 mm (1.9 in).
Wettest day (Rx1day) at Wellesley Island by year
Year
Wettest day (Rx1day)
1974
40.6 mm (1.6 in)
1975
93.0 mm (3.7 in)
1976
39.6 mm (1.6 in)
1977
53.1 mm (2.1 in)
1978
44.5 mm (1.8 in)
1979
127.0 mm (5.0 in)
1980
46.5 mm (1.8 in)
1981
62.2 mm (2.4 in)
1982
66.8 mm (2.6 in)
1983
67.1 mm (2.6 in)
1984
40.6 mm (1.6 in)
1985
73.9 mm (2.9 in)
1986
63.8 mm (2.5 in)
1987
38.1 mm (1.5 in)
1988
48.3 mm (1.9 in)
1989
33.8 mm (1.3 in)
1990
57.2 mm (2.3 in)
1991
43.4 mm (1.7 in)
1992
47.0 mm (1.9 in)
1993
50.3 mm (2.0 in)
1994
48.3 mm (1.9 in)
1995
58.4 mm (2.3 in)
1996
53.3 mm (2.1 in)
1997
42.9 mm (1.7 in)
1998
23.4 mm (0.9 in)
1999
59.7 mm (2.4 in)
2000
35.1 mm (1.4 in)
2001
54.6 mm (2.1 in)
2002
45.0 mm (1.8 in)
2003
68.6 mm (2.7 in)
2004
62.2 mm (2.4 in)
2005
42.7 mm (1.7 in)
Wettest five days (Rx5day)
The wettest five days of the year at Wellesley Island, 1974 to 2005. The record is 136.1 mm (5.4 in) in 1979, marked on the chart; the median year is 80.1 mm (3.2 in).
Wettest five days (Rx5day) at Wellesley Island by year
Year
Wettest five days (Rx5day)
1974
46.8 mm (1.8 in)
1975
102.2 mm (4.0 in)
1976
80.8 mm (3.2 in)
1977
69.4 mm (2.7 in)
1978
58.8 mm (2.3 in)
1979
136.1 mm (5.4 in)
1980
81.6 mm (3.2 in)
1981
82.5 mm (3.2 in)
1982
84.8 mm (3.3 in)
1983
93.5 mm (3.7 in)
1984
54.8 mm (2.2 in)
1985
85.7 mm (3.4 in)
1986
85.7 mm (3.4 in)
1987
63.8 mm (2.5 in)
1988
102.2 mm (4.0 in)
1989
49.8 mm (2.0 in)
1990
59.2 mm (2.3 in)
1991
60.4 mm (2.4 in)
1992
79.3 mm (3.1 in)
1993
56.1 mm (2.2 in)
1994
101.6 mm (4.0 in)
1995
64.5 mm (2.5 in)
1996
81.4 mm (3.2 in)
1997
53.3 mm (2.1 in)
1998
29.9 mm (1.2 in)
1999
97.3 mm (3.8 in)
2000
59.6 mm (2.3 in)
2001
70.7 mm (2.8 in)
2002
90.9 mm (3.6 in)
2003
81.3 mm (3.2 in)
2004
119.8 mm (4.7 in)
2005
54.3 mm (2.1 in)
Longest dry spell (CDD)
The longest dry spell of the year at Wellesley Island, 1974 to 2005. The record is 23 days in 1993, marked on the chart; the median year is 16 days.
Longest dry spell (CDD) at Wellesley Island by year
Year
Longest dry spell (CDD)
1974
12 days
1975
16 days
1976
15 days
1977
14 days
1978
22 days
1979
14 days
1980
14 days
1981
17 days
1982
17 days
1983
18 days
1984
19 days
1985
15 days
1986
12 days
1987
20 days
1988
16 days
1989
17 days
1990
13 days
1991
12 days
1992
10 days
1993
23 days
1994
16 days
1995
14 days
1996
15 days
1997
17 days
1998
13 days
1999
16 days
2000
15 days
2001
19 days
2002
18 days
2003
20 days
2004
15 days
2005
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
21 years with a frost
Across 21 years with a frost, the median last spring frost at Wellesley Island falls on 9 May and the median first autumn frost on 4 October, which leaves a median of 145 days between them.
Frost dates and growing season at Wellesley Island
Measure
Median, all years
Earliest period
Recent period (1975 to 1997)
Recent against earliest
Fitted trend
Last spring frost
9 May
n/a
9 May
n/a
n/a
First autumn frost
4 October
n/a
4 October
n/a
n/a
Growing days
145 days
n/a
145 days
n/a
n/a
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.
Download the Data
Data for Wellesley Island standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Wellesley Island 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.