With a view to investigating the influence of thunderstorms on the atmospheric radio noise field strength (ARNFS) over Kalyani (West Bengal), our round-the-clock recorded data of atmospherics at 27 kHz have been analysed for a 2-year period, January 1994-December 1995. An analysis of the regular behaviour of ARNFS exhibits that the median noise level decreases during the winter and is maximum during the monsoon months. Comparison of seasonal occurrences of thunderstorm days with ARNFS indicates that both of them have similar trends. However, ARNFS is more pronounced during daytime. The results are interpreted by considering the source activity and the propagation involved.