City and Climate. Data Research and Analysis
The climate of Primorsky Krai is temperate monsoon. One of the characteristic weather phenomena for such territories is the presence of all-day advection fog. This fact makes the region ideal for developing new methods of sky modeling.
Based on conducted research, it is proposed that the light climate of Primorsky Krai cannot be accurately represented in the standard MKO sky model, rendering the currently adopted methodology for calculating C.O.E. insufficient in its precision.
The topic of fog’s influence on illuminance has limited development in the scientific community. This work draws upon the research of the following authors: St. Darula, R. Kittler, B. Molineaux, P. Ineichen, and J. J. Delaunay, R. Perez, R. Seals, and J. Michalsky, A.M. Danilyuk, and Dr. Andrew Marsh.

Based on NOAA meteorological station data from 1990–2020, detailed statistics on daytime and nighttime fog hours were compiled for 29 locations. Vladivostok is an extreme case in the region: fog is observed here, on average, for 66.7 days a year, encompassing a large portion of the workday (5.73 hours during daylight).
Analysis of 15 sky types using the R. Kittler and S. Darula methodology revealed that in 46,6% of cases, the sky condition in Vladivostok did not fit their classification due to anomalously high values of diffuse illumination caused by ground-level aerosols (fog).
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