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Boston Cut-off Time Prediction Contest

Predict the 2027 Boston Cut-off Time and win a great prize and bragging rights among all your running friends.

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Historical weather

Historical Race Day Weather for the Chicagoland Spring Marathon

See historical race day weather for the Chicagoland Spring Marathon, including start temperature, humidity, wind, race day temperatures, PR score, and course score.

Weather Averages for Last 12 Years

Race day snapshot

Mostly Cloudy

Most common race morning weather across the last 12 years.

Start Line Conditions

Start Temp 54°F 12°C

Start Humidity 77% Humidity

Wind SW 8 mph

Race day high 68°F 20°C

Race day low 50°F 10°C

PR Score 97.52 Weather-influenced race day scoring

Course Score 99.19 Course-only Score

Race Day Weather by Year

Most recent years appear first so you can quickly compare start conditions, temperatures, wind, and scores across different editions of the race.

May 3, 2026

Race day snapshot

Partially cloudy

Start Line Conditions

Start Temp 45°F 7°C

Start Humidity 65% Humidity

Wind SW 14 mph Wind

Race day high 65°F 18°C

Race day low 42°F 6°C

PR Score 99.06 Normal score 99.06

Course Score 99.06 Course-only Score

Boston Qualifying Cut-off Time Prediction Contest