Weather in Port Jefferson, NY
Port Jefferson, Sunday, 15 November, 03:02
Clear. Feels like 31°. High 47°, low 40°.
Monthly outlook for Port Jefferson, NY: average high 50.9°, average low 43.3°. That is 0.9° above the climate normal for November. Precipitation is expected on 1 day (about 1.4 inches), against a normal of 5 days and 2.1 inches. The warmest day looks like 28 November (60.9°), the coolest 24 November (30.2°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 15 November – 24 November | 51.7° | 49.6° | +1.2° |
| 25 November – 4 December | 49.7° | 47.6° | +1.1° |
| 5 December – 14 December | at normal | 43.5° | — |
November records over 66 years
Climate normals and records are computed from the nearest reference point — Stony Brook University (4 mi).
0
Port Jefferson, Monday, 16 November
Overcast. High 49°, low 39°.
0
Port Jefferson, Tuesday, 17 November
Clear. High 52°, low 42°.
0
Port Jefferson, Wednesday, 18 November
Mostly clear. High 55°, low 47°.
0Port Jefferson, Thursday, 19 November
Overcast. High 56°, low 48°.
0Port Jefferson, Friday, 20 November
Clear. High 58°, low 50°.
0Port Jefferson, Saturday, 21 November
Clear. High 54°, low 50°.
0
Port Jefferson, Sunday, 22 November
Light rain. High 56°, low 53°.
0.01Port Jefferson, Monday, 23 November
Light rain. High 55°, low 39°.
0Port Jefferson, Tuesday, 24 November
Overcast. High 35°, low 30°.
0Port Jefferson, Wednesday, 25 November
Clear. High 42°, low 32°.
0Port Jefferson, Thursday, 26 November
Overcast. High 44°, low 36°.
0Port Jefferson, Friday, 27 November
Overcast. High 53°, low 42°.
1.41Port Jefferson, Saturday, 28 November
Heavy rain. High 61°, low 54°.
0Port Jefferson, Sunday, 29 November
Clear. High 53°, low 47°.
0Port Jefferson, Monday, 30 November
Overcast. High 45°, low 44°.
0.14
Port Jefferson, Tuesday, 1 December
Climate normal for this date — 60-year average.
0.14
Port Jefferson, Wednesday, 2 December
Climate normal for this date — 60-year average.
0.15Port Jefferson, Thursday, 3 December
Climate normal for this date — 60-year average.
0.12Port Jefferson, Friday, 4 December
Climate normal for this date — 60-year average.
0.17Port Jefferson, Saturday, 5 December
Climate normal for this date — 60-year average.
0.18Port Jefferson, Sunday, 6 December
Climate normal for this date — 60-year average.
0.15Port Jefferson, Monday, 7 December
Climate normal for this date — 60-year average.
0.11Port Jefferson, Tuesday, 8 December
Climate normal for this date — 60-year average.
0.24Port Jefferson, Wednesday, 9 December
Climate normal for this date — 60-year average.
0.13Port Jefferson, Thursday, 10 December
Climate normal for this date — 60-year average.
0.26Port Jefferson, Friday, 11 December
Climate normal for this date — 60-year average.
0.16Port Jefferson, Saturday, 12 December
Climate normal for this date — 60-year average.
0.11Port Jefferson, Sunday, 13 December
Climate normal for this date — 60-year average.
0.19Port Jefferson, Monday, 14 December
Climate normal for this date — 60-year average.
About the monthly outlook
How accurate is a 30-day forecast?
The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Port Jefferson, NY are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.
What does "above normal" mean?
We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.
Where do the 66-year records come from?
They are real temperature extremes recorded in Port Jefferson, NY since 1960: the highest and lowest reading for each calendar date, with the year it happened.
How often is it updated?
The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.
Sun and moon today
Weather history
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