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Wgn chicago 10 day weather forecast - the word

The horizon should be clearly defined and the brightest stars should be visible under good atmospheric conditions i. One still should be able to carry on ordinary outdoor activities.

Chicago Extended Forecast with high and low temperatures

The time period when the sun is between 6 and 12 degrees below the horizon at either sunrise or sunset. The horizon is well defined and the outline of objects might be visible without artificial light. Ordinary outdoor activities are not possible at this time without extra illumination.

The time period when the sun is between 12 and 18 degrees below the horizon at either sunrise or sunset. The sun does not contribute to the illumination of the sky before this time in the morning, or after this time in the evening.

The time period when the sun is between 6 and 12 degrees below the horizon at either sunrise or sunset.

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