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How to set monthly weather delay days from NOAA climate normals, with a Chicago O'Hare example

NOAA climate normals count rain days by month at more than 15,000 stations. This example turns Chicago O'Hare's counts into a work-day weather allowance.

4.8 Dec · -9.4% on the period

May averages the most rain days at Chicago O'Hare

Average days per month with 0.10 inch or more of precipitation, 1991-2020 normals

May averages the most rain days at Chicago O'HareBar chart with 12 points from Jan to Dec. Series: Days with 0.10 in. or more precipitation. Values range from 0 to 8.0510JanMarMayJulSepDecJan: 5.2Feb: 4.7Mar: 5.5Apr: 7.1May: 8.1Jun: 6.7Jul: 5.8Aug: 6.5Sep: 5.6Oct: 6.3Nov: 5.3Dec: 4.84.8
May averages the most rain days at Chicago O'HareBar chart with 12 points from Jan to Dec. Series: Days with 0.10 in. or more precipitation. Values range from 0 to 8.0510JanJulDecJan: 5.2Feb: 4.7Mar: 5.5Apr: 7.1May: 8.1Jun: 6.7Jul: 5.8Aug: 6.5Sep: 5.6Oct: 6.3Nov: 5.3Dec: 4.84.8
Station USW00094846. Precipitation includes the liquid equivalent of snow. Source: ncei.noaa.gov

All stories in Estimating

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DateTrendCategoryTitleSummary
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DataCommercial furniture prices rose 3.9% in the year to August as steel rose 23% FeatureBLS says producer prices for commercial furniture hit a record in August 2026, up 3.9% in a year, as steel mill products rose 23.4%.
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