Interdiurnal variability of air temperature in Zagreb

(in Croatian)

Abstract

A 100-year (1862 – 1961) continuous observation of air temperature measurements at the Zagreb-Grič meteorological Observatory has provided data for the study of interdiurnal variability of this meteorological element.

Data has been analysed in successive mean diurnal air temperature values and in frequencies of certain changes in mean diurnal air temperature.

The annual average of interdiurnal air temperature variability (IDVT) at Zagreb-Grič is 1.76°C. The main maximum is in January (1.99) and the secondary ones are in March (1.87) and June (1.85). The main minimum is in September (1.42) and the secondary ones are in February (1.78) and May (1.75).

The average cooling values from February to November exceed the average warming values, i.e. in about 75% days in a year. This means that at the Zagreb-Grič Observatory the processes cooling the atmosphere are more intensive than those heating it.

The IDVT frequencies have only been considered for January and July, showing an outstandingly narrow interval of IDVT values where all warming frequencies in July (IDVT £ 6.0°C) are included. As many as 86% of all heating cases are included in IDVT £ 3.0°C.

The results obtained are compared to analogous results of other authors.