Power spectrum analysis of a 230‐year series of temperature and precipitation at Philadelphia revealed significant but irregular rhythms between and three years. The quasi‐biennial cycle is well pronounced in the winter season. There are possible indications of the presence of the 80‐year solar cycle but in spite of statistical significance, the series is still too short to be certain. Coherence between annual temperature and precipitation is particularly strong at higher than 99% confidence level, for a cycle of 2.3 years.