<s>
Weather	O
is	O
a	O
weather	O
forecast	O
app	O
developed	O
by	O
Apple	O
Inc.	O
,	O
available	O
on	O
iOS	B-Application
since	O
the	O
release	O
of	O
the	O
iPhone	B-Operating_System
and	O
iPhone	B-Operating_System
OS	I-Operating_System
1	I-Operating_System
in	O
2007	O
.	O
</s>
<s>
A	O
version	O
of	O
Weather	O
is	O
also	O
available	O
for	O
watchOS	B-Device
;	O
however	O
,	O
it	O
is	O
limited	O
in	O
functionality	O
.	O
</s>
<s>
Weather	O
was	O
made	O
available	O
on	O
more	O
devices	O
across	O
the	O
Apple	O
ecosystem	O
with	O
the	O
releases	O
of	O
iPadOS	B-Operating_System
16	I-Operating_System
and	O
macOS	B-Operating_System
Ventura	I-Operating_System
,	O
where	O
weather	O
data	O
from	O
Apple	O
was	O
previously	O
only	O
available	O
as	O
a	O
widget	O
or	O
through	O
Siri	B-Application
.	O
</s>
<s>
Earlier	O
versions	O
of	O
Weather	O
up	O
through	O
the	O
release	O
of	O
iOS	B-Operating_System
7	I-Operating_System
sourced	O
the	O
app	O
's	O
forecast	O
data	O
from	O
Yahoo	B-Application
!	I-Application
</s>
<s>
Weather	O
;	O
in	O
March	O
2019	O
,	O
Yahoo	B-Application
!	I-Application
</s>
<s>
shut	O
down	O
the	O
servers	O
distributing	O
data	O
for	O
the	O
Weather	O
app	O
on	O
devices	O
supporting	O
iOS	B-Operating_System
7	I-Operating_System
and	O
earlier	O
operating	O
systems	O
.	O
</s>
<s>
From	O
iOS	B-Operating_System
8	I-Operating_System
to	O
iOS	B-Operating_System
15	I-Operating_System
,	O
The	O
Weather	O
Channel	O
was	O
used	O
as	O
the	O
app	O
's	O
weather	O
data	O
source	O
.	O
</s>
<s>
Since	O
iOS	B-Operating_System
16	I-Operating_System
,	O
Apple	O
has	O
used	O
their	O
own	O
internal	O
forecast	O
data	O
.	O
</s>
<s>
Following	O
the	O
acquisition	O
of	O
weather	O
app	O
Dark	O
Sky	O
,	O
many	O
features	O
have	O
been	O
rolled	O
into	O
Apple	O
's	O
own	O
Weather	O
app	O
with	O
the	O
release	O
of	O
iOS	B-Operating_System
15	I-Operating_System
.	O
</s>
<s>
iOS	B-Operating_System
14	I-Operating_System
introduced	O
support	O
for	O
severe	O
weather	O
warnings	O
,	O
allowing	O
a	O
user	O
to	O
receive	O
notifications	O
for	O
government-issued	O
severe	O
weather	O
events	O
such	O
as	O
tornadoes	O
,	O
flash	O
flooding	O
,	O
strong	O
winds	O
,	O
and	O
snow	O
storms	O
.	O
</s>
<s>
With	O
iOS	B-Operating_System
15	I-Operating_System
,	O
a	O
weather	O
map	O
can	O
be	O
accessed	O
from	O
the	O
bottom	O
left	O
of	O
the	O
application	O
which	O
can	O
display	O
the	O
temperature	O
,	O
air	O
quality	O
,	O
and	O
a	O
multi-day	O
precipitation	O
forecast	O
.	O
</s>
<s>
In	O
July	O
2021	O
,	O
some	O
testers	O
of	O
the	O
iOS	B-Operating_System
15	I-Operating_System
beta	O
software	O
noticed	O
that	O
the	O
Weather	O
app	O
avoided	O
displaying	O
an	O
accurate	O
temperature	O
when	O
it	O
was	O
.	O
</s>
<s>
Former	O
Apple	O
developer	O
João	O
Pavão	O
speculated	O
that	O
the	O
app	O
uses	O
whole	O
numbers	O
in	O
Celsius	B-Operating_System
for	O
the	O
temperature	O
data	O
,	O
later	O
converting	O
it	O
to	O
Fahrenheit	B-Library
for	O
the	O
user	O
interface	O
and	O
thus	O
making	O
it	O
impossible	O
for	O
any	O
number	O
that	O
was	O
not	O
the	O
result	O
of	O
the	O
conversion	O
to	O
be	O
displayed	O
.	O
</s>
<s>
WeatherKit	O
is	O
an	O
API	O
integration	O
which	O
provides	O
third-party	O
developers	O
with	O
access	O
to	O
the	O
Apple	B-Application
Weather	I-Application
service	O
,	O
replacing	O
the	O
former	O
Dark	O
Sky	O
API	O
.	O
</s>
