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December weather forecast in Ronkonkoma

30 days Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

30 days Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Sun

Sunday

Mon

Monday

Tue

Tuesday

Wed

Wednesday

Thu

Thursday

Fri

Friday

Sat

Saturday

30 November, sun

	764 mmHg		71%
	5.9 m/s		+12

30 November, Sunday. day, 9°; night, 4°; rain

1 December, mon

	761 mmHg		70%
	7 m/s		+12

1 December, Monday. day, 9°; night, 6°; rain

2 December, tue

	763 mmHg		67%
	6.1 m/s		+12

2 December, Tuesday. day, 8°; night, 4°; clear

3 December, wed

	763 mmHg		68%
	6.1 m/s		+12

3 December, Wednesday. day, 8°; night, 4°; clear

4 December, thu

	764 mmHg		67%
	5.1 m/s		+12

4 December, Thursday. day, 8°; night, 4°; clear

5 December, fri

	764 mmHg		71%
	5.4 m/s		+11

5 December, Friday. day, 7°; night, 4°; partly cloudy

6 December, sat

	763 mmHg		71%
	6.2 m/s		+11

6 December, Saturday. day, 7°; night, 3°; rain

7 December, sun

	763 mmHg		69%
	5.9 m/s		+11

7 December, Sunday. day, 6°; night, 3°; rain

8 December, mon

	765 mmHg		66%
	5.6 m/s		+11

8 December, Monday. day, 6°; night, 1°; clear

9 December, tue

	766 mmHg		72%
	5.5 m/s		+11

9 December, Tuesday. day, 6°; night, 1°; rain

10 December, wed

	764 mmHg		74%
	5.5 m/s		+11

10 December, Wednesday. day, 7°; night, 3°; overcast

11 December, thu

	763 mmHg		74%
	5.8 m/s		+11

11 December, Thursday. day, 7°; night, 3°; rain

12 December, fri

	764 mmHg		70%
	6.3 m/s		+11

12 December, Friday. day, 7°; night, 3°; rain

13 December, sat

	766 mmHg		68%
	5.1 m/s		+11

13 December, Saturday. day, 6°; night, 2°; clear

14 December, sun

	765 mmHg		73%
	5.9 m/s		+10

14 December, Sunday. day, 6°; night, 2°; rain

15 December, mon

	764 mmHg		70%
	5.9 m/s		+10

15 December, Monday. day, 6°; night, 2°; partly cloudy

16 December, tue

	765 mmHg		71%
	6.5 m/s		+10

16 December, Tuesday. day, 7°; night, 3°; rain

17 December, wed

	762 mmHg		74%
	6.1 m/s		+10

17 December, Wednesday. day, 6°; night, 3°; rain

18 December, thu

	762 mmHg		70%
	5.9 m/s		+10

18 December, Thursday. day, 6°; night, 2°; clear

19 December, fri

	764 mmHg		66%
	5.6 m/s		+10

19 December, Friday. day, 5°; night, 1°; partly cloudy

20 December, sat

	764 mmHg		68%
	5.9 m/s		+10

20 December, Saturday. day, 4°; night, 0°; clear

21 December, sun

	764 mmHg		69%
	6.2 m/s		+10

21 December, Sunday. day, 5°; night, 1°; clear

22 December, mon

	764 mmHg		68%
	6 m/s		+10

22 December, Monday. day, 6°; night, 2°; partly cloudy

23 December, tue

	765 mmHg		70%
	6.3 m/s		+9

23 December, Tuesday. day, 6°; night, 2°; partly cloudy

24 December, wed

	764 mmHg		71%
	6 m/s		+9

24 December, Wednesday. day, 6°; night, 2°; rain

25 December, thu

	764 mmHg		71%
	5.8 m/s		+9

25 December, Thursday. day, 5°; night, 2°; clear

26 December, fri

	765 mmHg		70%
	5.9 m/s		+9

26 December, Friday. day, 4°; night, 0°; partly cloudy

27 December, sat

	763 mmHg		70%
	6.1 m/s		+9

27 December, Saturday. day, 5°; night, 1°; clear

28 December, sun

	763 mmHg		70%
	5.8 m/s		+9

28 December, Sunday. day, 6°; night, 1°; clear

29 December, mon

	762 mmHg		72%
	5.6 m/s		+9

29 December, Monday. day, 6°; night, 2°; overcast

30 December, tue

	761 mmHg		71%
	6.1 m/s		+9

30 December, Tuesday. day, 5°; night, 1°; partly cloudy

31 December, wed

	763 mmHg		71%
	5.6 m/s		+9

31 December, Wednesday. day, 4°; night, 1°; snow

1 January, thu

	764 mmHg		71%
	5.6 m/s		+9

1 January, Thursday. day, 5°; night, 1°; clear

2 January, fri

	764 mmHg		71%
	5.6 m/s		+8

2 January, Friday. day, 5°; night, 0°; rain

3 January, sat

	763 mmHg		72%
	6.2 m/s		+8

3 January, Saturday. day, 4°; night, 0°; rain

Average data for 10 years

Ronkonkoma December

11

sunny days

11

days with precipitation

8

cloudy days

11 sunny days; 11 days with precipitation; 8 cloudy days;

70

%

air humidity

4.19

m/s

WindSW

111

mm of precipitation

(10% of annual average)

+10

°C

Water temperature

air humidity 70%; 111 millimeters of precipitation (10% of annual average); Wind south-westerly 4.19 Meters per second; Water temperature +10°

Weather graphs for December

TemperatureWater temperaturePrecipitation chance, %Humidity, %Wind, m/sPressure, mmHg

SW

SW

SW

W

SW

SW

SW

SW

SW

SW

SW

SW

SW

S

SW

S

SW

W

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

1

Average data for 10 years

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

Daytime temperature

Night-time temperature

Cities near you

New York
Boston
Philadelphia
Islandia
Colchester
Jamaica
Brooklyn
Brookhaven
Lake George

Cities with similar weather in December

Burgas
Varna
The Sunny Beach
Dublin
Copenhagen
Vancouver
The Golden Sands
Pomorie
Tsandrypsh

The weather forecast for December 2025 is based on historical data from the past 10 years.

In December, the weather in Ronkonkoma is typically cold. Average daily high temperature in December is about 6 degrees above zero. On average, Ronkonkoma has 11 sunny, 9 partly cloudy, 8 rainy, 2 cloudy, and 1 snowy day in December. The rains are usually heavy. December as well as January, February, March, and April is considered the most uncomfortable time to visit Ronkonkoma.

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