Hi. Can the 12 months of the year be a sample size?

L13 X V fx A B C D Average Temperature 6 Average Age Starting to Crawl Months After Birth Month 1 Month (weeks) (in units Fahrenheit) 2 January 29.84 66 3 February 30.52 73 4 March 29.7 72 5 April 31.84 63 6 May 28.58 52 7 June 31.44 39 8 July 33.64 33 9 August 32.82 30 10 September 33.83 33 11 October 33.35 37 12 November 33.38 48 13 December 32.32 57 14 15 16 17 18 19