birth_month avg_crawling_age sd n temperature January 29.84 7.08 32 66 February 30.52 6.96 36 73 March 29.7 8.33 23 72 April 31.84 6.21 26 63 May 28.58 8.07 27 52 June 31.44 8.1 29 39 July 33.64 6.91 21 33 August 32.82 7.61 45 30 September 33.83 6.93 38 33 October 33.35 7.29 44 37 November 33.38 7.42 49 48 December 32.32 5.71 44 57