A summer day is pleasant if there are intermittent periods of wind and the temperature stays below 84 degree F (29 degree C) all afternoon
A summer day with high humidity levels is oppressive either if the temperature stays above 84 degree F (29 degree C) all afternoon or if there is no wind
On Thursday morning, the air was very still, and it remained windless for the whole day. Humidity levels for the day were high, and even though the temperature fell below 84 degree F (29 degree C) between early and late afternoon, it was an oppressive day.