“Everything good, everything magical happens between the months of June and August. Winters are simply a time to count the weeks until the next summer”

Newspaper interview (1902), when asked what qualities a politician required, Halle, Kay, Irrepressible Churchill. Cleveland: World, 1966. cited in Churchill by Himself (2008), ed. Langworth, PublicAffairs, p. 489 ISBN 1586486381
Early career years (1898–1929)

Variant: Is Death important? No. Everything that happens before death is what counts.
Source: Something Wicked This Way Comes

Source: The Summer I Turned Pretty

From William Bruce Cameron's Informal Sociology: A Casual Introduction to Sociological Thinking (1963), p. 13. The comment is part of a longer paragraph and does not appear in quotations in Cameron's book, and other sources http://www.google.com/search?hl=en&q=%22not%20everything%20that%20can%20be%20counted%20counts%22%20cameron&um=1&ie=UTF-8&tbo=u&tbs=bks:1&source=og&sa=N&tab=wp such as The Student's Companion to Sociology (p. 92) http://books.google.com/books?id=KMsB1GE8dBEC&lpg=PA92&dq=%22Not%20everything%20that%20can%20be%20counted%20counts%22&pg=PA92#v=onepage&q=%22Not%20everything%20that%20can%20be%20counted%20counts%22&f=false attribute the quote to Cameron. A number of recent books http://www.google.com/search?hl=en&tbo=p&tbs=bks:1&q=%22not+everything+that+can+be+counted%22+einstein+princeton&start=0&sa=N claim that Einstein had a sign with these words in his office in Princeton, but until a reliable historical source can be found to support this, skepticism is warranted. The earliest source on Google Books that mentions the quote in association with Einstein and Princeton is Charles A. Garfield's 1986 book Peak Performers: The New Heroes of American Business, in which he wrote on p. 156:
: Albert Einstein liked to underscore the micro/macro partnership with a remark from Sir George Pickering that he chalked on the blackboard in his office at the Institute for Advanced Studies at Princeton: "Not everything that counts can be counted, and not everything that can be counted counts."
Misattributed

Variant: December is the toughest month of the year. Others are July, January, September, April, November, May, March, June, October, August, and February.
Source: Pudd'nhead Wilson

Speech delivered outside outside 10 Downing Street, announcing that he would resign as prime minister after British voters chose to leave the European Union in a referendum (June 24, 2016), see David Cameron's resignation speech in full http://www.cnn.com/2016/06/24/europe/david-cameron-full-resignation-speech/ (published by CNN)
2010s, 2016

Source: The Alchemist (1988), p. 184; this also has been quoted as "What happens once will never happen again. But what happens twice will surely happen a third time."

"Actor Danny Trejo saves a trapped baby from an overturned car" https://kfor.com/2019/08/07/actor-danny-trejo-saves-a-trapped-baby-from-an-overturned-car/ (August 7, 2019)

Chicago Daily News (February 20, 1958)