current run under 0.01" · longest ever 32 days (to Jul 18, 1966)
Wet Streak
0days
consecutive days with rain · longest ever 18 days
Year to Date vs Normal
87%
21.38" of a normal 24.57" · wettest 46.62" (1998) · driest 17.06" (1965)
Wettest & Driest Years
The extremes of a 62-year record (1964–2025) — full calendar-year totals. The long-run average is 45.02" a year.
Wettest Years on Record
1
1989
65.32in
2
2018
64.17in
3
1990
63.49in
4
1996
59.2in
5
1998
57.68in
Driest Years on Record
1
1965
25.27in
2
1985
34.41in
3
1980
34.61in
4
2016
34.99in
5
1964
35.78in
Rainfall by Month
The seasonal rhythm — each month's normal precipitation, with this year's totals in blue. Where the blue bar clears the band, the month ran wetter than usual.
J
F
M
A
M
J
J
A
S
O
N
D
Normal (median)This year
Normally wettest in Dec (~4.5") and driest in Jun (~2.84"). Wettest calendar month ever: Oct 2005, 14.07".
This Day in History · Rainfall
Every year's rainfall on each of the next 7 dates at Islip — toggle a day below. The tallest bar (ringed) is the wettest on record for that date.
Wettest Jul 28 ever
3.75in
set in 1969
Rain on Jul 28
31%
of 62 years had measurable rain
Wettest Jul 29 ever
1.00in
set in 2016
Rain on Jul 29
35%
of 62 years had measurable rain
Wettest Jul 30 ever
0.71in
set in 1971
Rain on Jul 30
16%
of 62 years had measurable rain
Wettest Jul 31 ever
2.93in
set in 2025
Rain on Jul 31
29%
of 62 years had measurable rain
Wettest Aug 1 ever
0.97in
set in 1970
Rain on Aug 1
27%
of 62 years had measurable rain
Wettest Aug 2 ever
1.12in
set in 1986
Rain on Aug 2
26%
of 62 years had measurable rain
Wettest Aug 3 ever
1.36in
set in 1987
Rain on Aug 3
27%
of 62 years had measurable rain
This Year's Rainfall
Islip's cumulative rainfall so far this year against its own record — the normal accumulation, and the wettest & driest years to date. The bright line is the running total; where it rides the band tells the story at a glance.
Islip's entire daily record as one heatmap — each row a year, each cell a day, shaded by that day's rainfall. Dry spells read as dark blocks, wet seasons as brighter bands; the whole climate at a glance.
