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
103%
30.72" of a normal 29.92" · wettest 49.6" (1998) · driest 18.71" (1995)
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 Aug 24 ever
6.74in
set in 1990
Rain on Aug 24
19%
of 62 years had measurable rain
Wettest Aug 25 ever
2.13in
set in 1985
Rain on Aug 25
24%
of 62 years had measurable rain
Wettest Aug 26 ever
0.92in
set in 1999
Rain on Aug 26
26%
of 62 years had measurable rain
Wettest Aug 27 ever
2.19in
set in 2006
Rain on Aug 27
23%
of 62 years had measurable rain
Wettest Aug 28 ever
2.01in
set in 2021
Rain on Aug 28
36%
of 61 years had measurable rain
Wettest Aug 29 ever
2.72in
set in 2002
Rain on Aug 29
23%
of 62 years had measurable rain
Wettest Aug 30 ever
0.54in
set in 1974
Rain on Aug 30
21%
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.
