 In the winter, there are typically 63.6 nights falling below freezing, with the all-time record low being on December 9, 1978 – though the dryness means only one day every three or four winters will fail to top freezing, and only 6.4 days per winter will not top .The average snowfall is , but the median is zero so that most winters do not have measurable falls, though fell in January 1978.Since 1899 the wettest calendar year has been 1914 with and the driest 1956 with , whilst the wettest month has been July 1919 with , and the wettest day October 30 of 1951 with .