Lettucing Gutted

Yeah Stratosferric was surprised if we had seen only one let alone six!

Rob labeled London as Enfield.

I am surprised that October 1978-April 1979 had more air frosts than October 2012-April 2013 since that period started with one of the warmest Autumns on record.

19C

If May finishes below 11.2C, with 5 months January-May 2013 will join January-May 1986, July-November 1988 and July-November 1993 for the longest consecutive string of months below the 1961-1990 CET average since December 1978-June 1979.

That would bring every month from October through May below 10C for the first time since October 1974-May 1975. Interestingly that period was interspersed by one of the warmest winters on record and ended with one of the warmest summers on record. However for a sub 10C October-May period interspersed with a cool/cold winter we have to go all the way back to 1940/1941.

It has to be said that May has not had a particularly cold second half to the month since at least 1996 so it will be remarkable if we do get one.

Ha you beat me to it! I was just thinking the same thing.

Stage 4 Global Warming here we come!

15.5C

Looking at Roger's stats its interesting that the warmest ever and coldest ever daily means in May are less than 4C warmer than April's despite the greater increase in average monthly CET.

That sub 5C daily CET predicted for the 27th looks interesting. It could be the coolest end to April since at least 1989.

April 1984 had a very cold first week but finished above average. It won't surprise me if this April could go the same way.

My forgettable years are 1999, 2000, 2002, 2005 and 2011.

The highest daily CET this March is less than 7C (albeit only just). This is very rare even in the winter months but this is just incredible for March!

lol. Less than 5 years ago many people here including myself didn't even think we will see sub 3C winter months ever again.

Again I think we are seeing the effects of reduced Solar Radiation and Arctic Ice Loss producing opposing effects on the Mid-High Latitude Continents. On the one hand the reduction of Solar Radiation has caused stronger Upper Level Troughs over the Continents in winter which generate strong surface highs as the thermodynamic byproduct of deep Cold Air Advection and radiative cooling which leads to mass convergence in the deep cold pools. While on the other hand the Arctic Ice Loss has led to stronger and more amplified Upper Level Ridges over the Continents in summer which again generate strong surface highs but this time only as a dynamic byproduct of mass convergence in the deep warm pools. The same surface high cannot cause both extreme cold and heat without an Upper Level pattern change.

Yes. This is pretty much my thinking. I believe the cooling effects from lower Solar Radiation via the La Nina base state and -PDO has favored our "chilly and rather wet" synoptics but the background warming via the Arctic Ice Loss has diluted our cold pool and Polar Vortex meaning that our cold airmasses are not as cold as they use to be, which results in our coldest summer and winter months being warmer than if the same months occurred with a cooler Arctic. Hence July 2011 is the new and warmer July 1888 and January 2010 is the new and warmer January 1963. This conflict of forcings also means we see swings from cool/cold winters to mild/hot springs then back to near average/or even cool summers but then back to mild/hot autumns all in the same year as we saw in 2009 and 2011.

That's amazing after only one year since one of the warmest ever such periods in September 2011 through March 2012. Where's Tamara G, Snowmaiden and Stratos Ferric? They should see this.

October 2003 because I loved the crisp, cool days and frosty mornings! January 2010 because of the great powder snow and very frosty weather! December 2010 everyone knows why July 2011 because of the cool fresh nights and classic sunshine and showers days! March 2013 because of the variety of cold and sunny days, sunshine and showers days, and cold and snowy days! Honorable mentions also goto February 1991, June 1991, July 1993, August 1993, September 1993, October 1993, November 1993, March 1995, December 1995, May 1996, November 1996, June 1997, October 1997, November 2005, October 2008 and November 2010.

12C

Also could this be coldest second half of March for the CET since at least 1962?

10C

8C

I think 2013 will be another trying year for snow and cold lovers. I have not even seen a flake of snow since December 2010...