ON THE SEASONAL-VARIATION OF LOCAL RELATIONSHIPS BETWEEN TEMPERATURE,TEMPERATURE-RANGE, SUNSHINE AND CLOUDINESS

At Berlin-Dahlem, montly single station data on cloudiness, sunshine d uration, mean, maximum and minimum temperature is statistically analyz ed for the time period 1955-1993. It is found that sunshine duration v aries inversely with cloud cover; cloud cover correlates negatively wi th temperature range. Cloud cover correlates negatively with temperatu re between March and September, and positively with temperature during the remaining months. Between 1955 und 1993, there are no significant changes in temperature range in any month but June and September, whe n a decline occurred. Sunshine declined significantly in March, June a nd September. Trends between 1955 and 1987 indicate a larger decline o f sunshine and decline in temperature range than between 1955 and 1993 . Locally, sulfate deposition, which may be taken as an indicator of t he atmospheric sulfate load, decreased by more than a third between th e mid-1950s and the late 1980s. Therefore, at Berlin, the observed inc rease of cloudiness (decrease of sunshine duration) between the 1950s and the late 1980s went parallel to the measured decrease of sulfate d eposition.