Port Jefferson, NY Weather Data

Port Jefferson, NY Current Weather Data

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Port Jefferson, NY Historical Weather Trends

*Historical weather data collected from Mastic, NY
Port Jefferson, NY

Port Jefferson, NY Chance of Sunshine

Month
% Sunny
Clear Days
Partly Cloudy Days
Cloudy Days
January
51.61%
8
8
15
February
53.57%
8
7
13
March
54.84%
8
9
14
April
53.33%
7
9
14
May
54.84%
7
10
14
June
60.00%
8
10
12
July
61.29%
7
12
12
August
62.50%
9
11
12
September
61.29%
10
9
12
October
61.29%
11
8
12
November
53.33%
8
8
14
December
51.61%
8
8
15

Port Jefferson, NY Historical Temperature

Month
Average
Max Average
Min Average
January
31.18°
38.63°
23.72°
February
33.75°
41.6°
25.88°
March
41.7°
49.78°
33.58°
April
51.33°
60.45°
42.17°
May
60.41°
69.37°
51.41°
June
69.5°
77.8°
61.16°
July
76.13°
84.15°
68.05°
August
73.82°
81.9°
65.72°
September
67.18°
75.18°
59.13°
October
56.07°
64.22°
47.83°
November
45.37°
52.73°
37.92°
December
36.7°
44.33°
29.05°

Port Jefferson, NY Rainfall and Snowfall Average

Month
Average Rainfall
Average Snowfall
January
2.24 Inches
7.81 Inches
February
4.27 Inches
11.52 Inches
March
3.96 Inches
3.8 Inches
April
3.47 Inches
0.01 Inches
May
3.52 Inches
0 Inches
June
5.07 Inches
0 Inches
July
4.26 Inches
0 Inches
August
4.29 Inches
0 Inches
September
2.86 Inches
0 Inches
October
3.58 Inches
0.03 Inches
November
2.19 Inches
0.55 Inches
December
5.05 Inches
7.26 Inches

Port Jefferson, NY Energy Demand

Month
Avg. Daily HDD (?)
Avg. Daily CDD (?)
Total
January
33.45
0
33.45
February
30.52
0
30.52
March
23.1
0
23.1
April
13.55
0.13
13.68
May
5.53
1.16
6.69
June
0.7
5.43
6.13
July
0.04
10.99
11.03
August
0.05
8.97
9.02
September
1.33
3.72
5.05
October
8.83
0.52
9.35
November
19.22
0
19.22
December
28.03
0
28.03