Weather in Janesville, IA
Janesville, Sunday, 9 August, 00:38
Partly cloudy. Feels like 66°. High 83°, low 66°.
Monthly outlook for Janesville, IA: average high 78.1°, average low 61.6°. That is 0.7° below the climate normal for August. Precipitation is expected on 7 days (about 0.9 inches), against a normal of 5 days and 2.2 inches. The warmest day looks like 18 August (90.2°), the coolest 21 August (52°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 79.7° | 79.4° | +0.2° |
| 19 August – 28 August | 75.4° | 79.6° | -2.4° |
| 29 August – 7 September | at normal | 78° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — New Hartford (10 mi).
0.07
Janesville, Monday, 10 August
Rain. High 86°, low 71°.
0
Janesville, Tuesday, 11 August
Overcast. High 84°, low 71°.
0Janesville, Wednesday, 12 August
Overcast. High 82°, low 67°.
0.01Janesville, Thursday, 13 August
Light rain. High 74°, low 61°.
0Janesville, Friday, 14 August
Overcast. High 77°, low 57°.
0.11Janesville, Saturday, 15 August
Light rain. High 67°, low 58°.
0.03Janesville, Sunday, 16 August
Light rain. High 71°, low 58°.
0
Janesville, Monday, 17 August
Mostly clear. High 83°, low 63°.
0.1Janesville, Tuesday, 18 August
Light rain. High 90°, low 67°.
0.39Janesville, Wednesday, 19 August
Rain. High 74°, low 61°.
0.04Janesville, Thursday, 20 August
Light rain. High 63°, low 55°.
0Janesville, Friday, 21 August
Overcast. High 74°, low 52°.
0.06Janesville, Saturday, 22 August
Light rain. High 81°, low 57°.
0
Janesville, Sunday, 23 August
Clear. High 82°, low 61°.
0.07Janesville, Monday, 24 August
Light rain. High 79°, low 61°.
0.13
Janesville, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.15Janesville, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.14Janesville, Thursday, 27 August
Climate normal for this date — 60-year average.
0.22Janesville, Friday, 28 August
Climate normal for this date — 60-year average.
0.13
Janesville, Saturday, 29 August
Climate normal for this date — 60-year average.
0.11Janesville, Sunday, 30 August
Climate normal for this date — 60-year average.
0.06Janesville, Monday, 31 August
Climate normal for this date — 60-year average.
0.07Janesville, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.09Janesville, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.09Janesville, Thursday, 3 September
Climate normal for this date — 60-year average.
0.09Janesville, Friday, 4 September
Climate normal for this date — 60-year average.
0.09Janesville, Saturday, 5 September
Climate normal for this date — 60-year average.
0.09Janesville, Sunday, 6 September
Climate normal for this date — 60-year average.
0.13Janesville, Monday, 7 September
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 Janesville, 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 Janesville, 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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