Weather in Crystal Lake, IA
Crystal Lake, Saturday, 8 August, 23:39
Clear. Feels like 67°. High 79°, low 55°.
Monthly outlook for Crystal Lake, IA: average high 82.3°, average low 60.1°. That is 2.1° above the climate normal for August. Precipitation is expected on 7 days (about 0.8 inches), against a normal of 5 days and 2.1 inches. The warmest day looks like 18 August (100.5°), the coolest 21 August (50.2°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 8 August – 17 August | 81.9° | 78.6° | +1.8° |
| 18 August – 27 August | 83° | 78.6° | +2.4° |
| 28 August – 6 September | at normal | 77.4° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Woden (6 mi).
0.04
Crystal Lake, Sunday, 9 August
Light rain. High 80°, low 65°.
0.09Crystal Lake, Monday, 10 August
Light rain. High 88°, low 68°.
0.07Crystal Lake, Tuesday, 11 August
Light rain. High 87°, low 66°.
0
Crystal Lake, Wednesday, 12 August
Overcast. High 86°, low 66°.
0Crystal Lake, Thursday, 13 August
Overcast. High 77°, low 61°.
0Crystal Lake, Friday, 14 August
Overcast. High 82°, low 57°.
0.01Crystal Lake, Saturday, 15 August
Light rain. High 72°, low 59°.
0Crystal Lake, Sunday, 16 August
Overcast. High 80°, low 58°.
0
Crystal Lake, Monday, 17 August
Mostly clear. High 88°, low 63°.
0.08Crystal Lake, Tuesday, 18 August
Light rain. High 101°, low 68°.
0.31Crystal Lake, Wednesday, 19 August
Rain. High 79°, low 57°.
0.04Crystal Lake, Thursday, 20 August
Light rain. High 65°, low 54°.
0Crystal Lake, Friday, 21 August
Overcast. High 78°, low 50°.
0.12Crystal Lake, Saturday, 22 August
Light rain. High 89°, low 57°.
0
Crystal Lake, Sunday, 23 August
Clear. High 87°, low 57°.
0.14
Crystal Lake, Monday, 24 August
Climate normal for this date — 60-year average.
0.13Crystal Lake, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.1Crystal Lake, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.15
Crystal Lake, Thursday, 27 August
Climate normal for this date — 60-year average.
0.2Crystal Lake, Friday, 28 August
Climate normal for this date — 60-year average.
0.07Crystal Lake, Saturday, 29 August
Climate normal for this date — 60-year average.
0.11Crystal Lake, Sunday, 30 August
Climate normal for this date — 60-year average.
0.1Crystal Lake, Monday, 31 August
Climate normal for this date — 60-year average.
0.1Crystal Lake, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.13Crystal Lake, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.08Crystal Lake, Thursday, 3 September
Climate normal for this date — 60-year average.
0.1Crystal Lake, Friday, 4 September
Climate normal for this date — 60-year average.
0.11Crystal Lake, Saturday, 5 September
Climate normal for this date — 60-year average.
0.05Crystal Lake, Sunday, 6 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 Crystal Lake, 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 Crystal Lake, 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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