Weather in Jefferson Island, MT
Jefferson Island, Sunday, 9 August, 06:06
Clear. Feels like 52°. High 88°, low 55°.
Monthly outlook for Jefferson Island, MT: average high 84.4°, average low 57.3°. That is 1.2° above the climate normal for August. Precipitation is expected on 5 days (about 1.3 inches), against a normal of 5 days and 0.9 inches. The warmest day looks like 11 August (94.5°), the coolest 24 August (51.7°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 85.4° | 82.9° | +1.4° |
| 19 August – 28 August | 82.5° | 80.9° | +0.9° |
| 29 August – 7 September | at normal | 78.3° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Cardwell (1 mi).
0
Jefferson Island, Monday, 10 August
Clear. High 92°, low 53°.
0Jefferson Island, Tuesday, 11 August
Clear. High 94°, low 59°.
0
Jefferson Island, Wednesday, 12 August
Overcast. High 85°, low 60°.
0Jefferson Island, Thursday, 13 August
Overcast. High 89°, low 58°.
0.47
Jefferson Island, Friday, 14 August
Rain. High 73°, low 59°.
0
Jefferson Island, Saturday, 15 August
Mostly clear. High 86°, low 56°.
0.08Jefferson Island, Sunday, 16 August
Light rain. High 77°, low 62°.
0.14Jefferson Island, Monday, 17 August
Rain. High 86°, low 59°.
0Jefferson Island, Tuesday, 18 August
Overcast. High 82°, low 57°.
0Jefferson Island, Wednesday, 19 August
Overcast. High 84°, low 62°.
0Jefferson Island, Thursday, 20 August
Clear. High 87°, low 56°.
0.04Jefferson Island, Friday, 21 August
Light rain. High 83°, low 62°.
0.57Jefferson Island, Saturday, 22 August
Rain. High 77°, low 57°.
0.01Jefferson Island, Sunday, 23 August
Light rain. High 78°, low 52°.
0Jefferson Island, Monday, 24 August
Overcast. High 85°, low 52°.
0.04
Jefferson Island, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.04Jefferson Island, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.04Jefferson Island, Thursday, 27 August
Climate normal for this date — 60-year average.
0.03Jefferson Island, Friday, 28 August
Climate normal for this date — 60-year average.
0.04Jefferson Island, Saturday, 29 August
Climate normal for this date — 60-year average.
0.06Jefferson Island, Sunday, 30 August
Climate normal for this date — 60-year average.
0.05Jefferson Island, Monday, 31 August
Climate normal for this date — 60-year average.
0.05Jefferson Island, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.04Jefferson Island, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.04Jefferson Island, Thursday, 3 September
Climate normal for this date — 60-year average.
0.05Jefferson Island, Friday, 4 September
Climate normal for this date — 60-year average.
0.04Jefferson Island, Saturday, 5 September
Climate normal for this date — 60-year average.
0.07Jefferson Island, Sunday, 6 September
Climate normal for this date — 60-year average.
0.06Jefferson Island, 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 Jefferson Island, MT 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 Island, MT 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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