Weather in Jefferson, IA
Jefferson, Monday, 19 October, 04:05
Partly cloudy. Feels like 37°. High 67°, low 41°.
Monthly outlook for Jefferson, IA: average high 61.2°, average low 44°. That is 2.2° above the climate normal for October. Precipitation is expected on 1 day (about 0.1 inches), against a normal of 4 days and 1.4 inches. The warmest day looks like 24 October (72.4°), the coolest 29 October (29.4°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 19 October – 28 October | 64.7° | 58.9° | +3.2° |
| 29 October – 7 November | 55.3° | 53.6° | +1° |
| 8 November – 17 November | at normal | 48.2° | — |
October records over 66 years
0
Jefferson, Tuesday, 20 October
Clear. High 70°, low 41°.
0Jefferson, Wednesday, 21 October
Clear. High 71°, low 49°.
0Jefferson, Thursday, 22 October
Clear. High 72°, low 50°.
0
Jefferson, Friday, 23 October
Overcast. High 72°, low 52°.
0Jefferson, Saturday, 24 October
Overcast. High 72°, low 57°.
0.09
Jefferson, Sunday, 25 October
Light rain. High 64°, low 50°.
0.01Jefferson, Monday, 26 October
Light rain. High 70°, low 48°.
0Jefferson, Tuesday, 27 October
Light rain. High 46°, low 39°.
0Jefferson, Wednesday, 28 October
Clear. High 42°, low 31°.
0Jefferson, Thursday, 29 October
Clear. High 46°, low 29°.
0
Jefferson, Friday, 30 October
Partly cloudy. High 48°, low 30°.
0Jefferson, Saturday, 31 October
Overcast. High 52°, low 39°.
0Jefferson, Sunday, 1 November
Overcast. High 60°, low 44°.
0.03Jefferson, Monday, 2 November
Light rain. High 66°, low 56°.
0Jefferson, Tuesday, 3 November
Clear. High 59°, low 48°.
0.05Jefferson, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.05Jefferson, Thursday, 5 November
Climate normal for this date — 60-year average.
0.06Jefferson, Friday, 6 November
Climate normal for this date — 60-year average.
0.02
Jefferson, Saturday, 7 November
Climate normal for this date — 60-year average.
0.04Jefferson, Sunday, 8 November
Climate normal for this date — 60-year average.
0.12Jefferson, Monday, 9 November
Climate normal for this date — 60-year average.
0.09Jefferson, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.08Jefferson, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.07Jefferson, Thursday, 12 November
Climate normal for this date — 60-year average.
0.07Jefferson, Friday, 13 November
Climate normal for this date — 60-year average.
0.03Jefferson, Saturday, 14 November
Climate normal for this date — 60-year average.
0.07Jefferson, Sunday, 15 November
Climate normal for this date — 60-year average.
0.04Jefferson, Monday, 16 November
Climate normal for this date — 60-year average.
0.08Jefferson, Tuesday, 17 November
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 Jefferson, IA 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 Jefferson, IA 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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