Geo- and heliophysical situations have been evaluated specially for th
e days of serial crimes committed during 1980-1990 in USSR. The analys
is of 150 episodes (ten separate series) shows that the crimes are mos
t probable immediately or 1-3 days after sharp decrease of solar activ
ity (Wolf numbers) geomagnetic activity (A(3) and K indices) and of lo
west daily surface and air temperature.