Weekday-weekend Differences of Urban Climates

Part 1: Temporal Variation of Air Temperature

Abstract

Weekday-weekend differences of air temperature and other meteorological parameters in the central part of Tokyo are described on the basis of data for 25 years. Temperature is lower on Sundays than on weekdays by about 0.2°C in the daytime and about 0.1°C in the nighttime on the 25year average. The magnitude of the weekday-weekend temperature difference depends on seasons and meteorological conditions, and has increased during the 25 years. In recent years temperature is lower also on Saturday evening.
In the daytime of Sundays pressure is higher by about 0.05mb than on weekdays. This fact indicates that the weekday-Sunday difference of temperature occurs over a depth of several hundred meters above the surface. In the nighttime no pressure difference is found between weekdays and Sundays, hence the temperature difference is likely to be confined in a layer much shallower than in the daytime.
Weekday-weekend differences are also found for wind speed, relative humidity, and solar radiation.