Weather in Jefferson, IA
Jefferson, Monday, 12 October, 07:29
Partly cloudy. Feels like 70°. High 89°, low 67°.
Monthly outlook for Jefferson, IA: average high 66.8°, average low 50.5°. That is 3.6° above the climate normal for October. Precipitation is expected on 6 days (about 1.7 inches), against a normal of 4 days and 1.3 inches. The warmest day looks like 12 October (89°), the coolest 17 October (38.3°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 12 October – 21 October | 68.4° | 61.5° | +3.8° |
| 22 October – 31 October | 64.2° | 57.4° | +3.8° |
| 1 November – 10 November | at normal | 51.9° | — |
October records over 66 years
0
Jefferson, Tuesday, 13 October
Clear. High 74°, low 54°.
0
Jefferson, Wednesday, 14 October
Overcast. High 64°, low 50°.
0.11
Jefferson, Thursday, 15 October
Light rain. High 63°, low 56°.
0Jefferson, Friday, 16 October
Clear. High 57°, low 44°.
0Jefferson, Saturday, 17 October
Clear. High 60°, low 38°.
0Jefferson, Sunday, 18 October
Clear. High 63°, low 42°.
0Jefferson, Monday, 19 October
Overcast. High 67°, low 48°.
0Jefferson, Tuesday, 20 October
Clear. High 72°, low 53°.
0.04Jefferson, Wednesday, 21 October
Light rain. High 76°, low 57°.
0.2Jefferson, Thursday, 22 October
Rain. High 78°, low 62°.
0.17Jefferson, Friday, 23 October
Rain. High 65°, low 51°.
0.78Jefferson, Saturday, 24 October
Rain. High 58°, low 44°.
0.42Jefferson, Sunday, 25 October
Rain. High 63°, low 53°.
0Jefferson, Monday, 26 October
Clear. High 59°, low 43°.
0Jefferson, Tuesday, 27 October
Clear. High 63°, low 44°.
0.06
Jefferson, Wednesday, 28 October
Climate normal for this date — 60-year average.
0.09Jefferson, Thursday, 29 October
Climate normal for this date — 60-year average.
0.09Jefferson, Friday, 30 October
Climate normal for this date — 60-year average.
0.1Jefferson, Saturday, 31 October
Climate normal for this date — 60-year average.
0.15
Jefferson, Sunday, 1 November
Climate normal for this date — 60-year average.
0.06Jefferson, Monday, 2 November
Climate normal for this date — 60-year average.
0.07Jefferson, Tuesday, 3 November
Climate normal for this date — 60-year average.
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.
0.02Jefferson, 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.
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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