Let's start with a more interesting year like 2010, then a more mad and messed up year like last year and so how 2012 is faring!

January 2010: UK Mean Temp = 0.9C, Max Temp = 13.2C, Min Temp = -22.3C
February 2010: UK Mean Temp = 1.9C, Max Temp = 13.3C, Min Temp = -19.2C
March 2010: UK Mean Temp = 5.1C, Max Temp = 18.0C, Min Temp = -18.6C
April 2010: UK Mean Temp = 8.0C, Max Temp = 22.9C, Min Temp = -7.0C
May 2010: UK Mean Temp = 9.8C, Max Temp = 28.9C, Min Temp = -6.0C
June 2010: UK Mean Temp = 14.2C, Max Temp = 30.9C, Min Temp = -0.1C
July 2010: UK Mean Temp = 15.6C, Max Temp = 31.7C, Min Temp = 0.1C
August 2010: UK Mean Temp = 14.2C, Max Temp = 26.7C, Min Temp = -1.3C
September 2010: UK Mean Temp = 12.8C, Max Temp = 24.6C, Min Temp = -4.4C
October 2010: UK Mean Temp = 9.4C, Max Temp = 23.1C, Min Temp = -6.6C
November 2010: UK Mean Temp = 4.3C, Max Temp = 19.0C, Min Temp = -18.0C
December 2010: UK Mean Temp = -0.9C, Max Temp = 12.0C, Min Temp = -21.3C
Annual: UK Mean Temp (15.6C/-0.9C), Max Temp = 31.7C, Min Temp = -22.3C

January 2011: UK Mean Temp = 3.1C, Max Temp = 14.5C, Min Temp = -13.0C
February 2011: UK Mean Temp = 5.3C, Max Temp = 16.0C, Min Temp = -6.8C
March 2011: UK Mean Temp = 5.8C, Max Temp = 20.0C, Min Temp = -7.5C
April 2011: UK Mean Temp = 10.7C, Max Temp = 27.8C, Min Temp = -5.4C
May 2011: UK Mean Temp = 11.0C, Max Temp = 25.4C, Min Temp = -6.3C
June 2011: UK Mean Temp = 12.7C, Max Temp = 33.1C, Min Temp = -1.9C
July 2011: UK Mean Temp = 14.2C, Max Temp = 27.4C, Min Temp = -0.8C
August 2011: UK Mean Temp = 14.1C, Max Temp = 30.3C, Min Temp = 0.5C
September 2011: UK Mean Temp = 13.8C, Max Temp = 29.2C, Min Temp = -0.4C
October 2011: UK Mean Temp = 11.2C, Max Temp = 29.9C, Min Temp = -3.3C
November 2011: UK Mean Temp = 8.7C, Max Temp = 19.2C, Min Temp = -6.1C
December 2011: UK Mean Temp = 4.8C, Max Temp = 15.5C, Min Temp = -9.4C
Annual: UK Mean Temp (14.2C/3.1C), Max Temp = 33.1C, Min Temp = -13.0C

January 2012: UK Mean Temp = 4.7C, Max Temp = 14.0C, Min Temp = -10.5C
February 2012: UK Mean Temp = 4.1C, Max Temp = 18.7C, Min Temp = -15.6C
March 2012: UK Mean Temp = 7.7C, Max Temp = 23.6C, Min Temp = -8.5C
April 2012: UK Mean Temp = 6.3C, Max Temp = 19.7C, Min Temp = -8.2C

How does 2012 fare againts 2011 and 2010?

The 2010's So Far:

January: UK Mean Temp = 0.9C/4.7C (2010/2012), Max Temp = 14.5C (2011), Min Temp = -22.3C (2010)
February: UK Mean Temp = 1.9C/5.3C (2010/2011), Max Temp = 18.7C (2012), Min Temp = -19.2C (2010)
March: UK Mean Temp = 5.1C/7.7C (2010/2012), Max Temp = 23.6C (2012), Min Temp = -18.6C (2010)
April: UK Mean Temp = 8.0C/10.7C (2010/2011), Max Temp = 27.8C (2011), Min Temp = -8.2C (2012)
May: UK Mean Temp = 11.0C/9.8C (2011/2010), Max Temp = 28.9C (2010), Min Temp = -6.3C (2011)
June: UK Mean Temp = 14.2C/12.7C (2010/2011), Max Temp = 33.1C (2011), Min Temp = -1.9C (2011)
July: UK Mean Temp = 15.6C/14.2C (2010/2011), Max Temp = 31.7C (2010), Min Temp = -0.8C (2011)
August: UK Mean Temp = 14.2C/14.1C (2010/2011), Max Temp = 30.3C (2010), Min Temp = -1.3C (2010)
September: UK Mean Temp = 13.8C/12.8C (2011/2010), Max Temp = 29.2C (2011), Min Temp = -4.4C (2010)
October: UK Mean Temp = 9.4C/11.2C (2010/2011), Max Temp = 29.9C (2011), Min Temp = -6.6C (2010)
November: UK Mean Temp = 4.3C/8.7C (2010/2011), Max Temp = 19.2C (2011), Min Temp = -18.0C (2010)
December: UK Mean Temp = -0.9C/4.8C (2010/2011), Max Temp = 15.5C (2011), Min Temp = -21.3C (2010)

Records to beat:

January: Max Temp = 18.3C, Min Temp = -27.2C
February: Max Temp = 19.7C, Min Temp = -27.2C
March: Max Temp = 25.6C, Min Temp = -22.8C
April: Max Temp = 29.4C, Min Temp = -15.0C
May: Max Temp = 32.8C, Min Temp = -9.4C
June: Max Temp = 35.6C, Min Temp = -5.6C
July: Max Temp = 36.5C, Min Temp = -2.5C
August: Max Temp = 38.5C, Min Temp = -4.5C
September: Max Temp = 35.6C, Min Temp = -6.7C
October: Max Temp = 29.9C, Min Temp = -11.7C
November: Max Temp = 21.7C, Min Temp = -23.3C
December: Max Temp = 18.3C, Min Temp = -27.2C