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Yes, I am sure that a mile is long enough to be affected by temperature. Heat dissipation is very much an issue in a race that lasts over three minutes.
An historical table says that weather was very good for Ryun's 2nd mile world record, 3:51.1 in 1967, which was in Bakersfield, CA, one of only three warm weather cities where there have been mile world records since Roger Bannister broke 4. The other two are Kingston, Jamaica (Filbert Bayi, but in May) and Rome (El Guerrouj July 7 1999). In Rome that day, the high temp was 80 degrees, the low temperature 68, and the dew point was just 71 degrees. The race probably was at night with quite favorable conditions. Kingston, Jamaica has averages in May of 77/88. This record just beat Ryun's record and Walker subsequently dropped it almost two seconds, so given Bayi's ability, demonstrated in other races, it seems likely to me that the weather that day probably slowed him down--and I don't know exactly what the weather was. All the other sub 4 mile world records were set in cool weather cities.

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