The daily mean temp 80 -90 degrees North has remained below climatological normal for more than 120 days, and has now dropped below freezing
Normally, we don’t see this sort of drop until early to mid September. I’m surprised to see this sharp drop today:
See this magnified view:
Bear in mind that this is weather, and that the average temperature for the area could easily go above freezing again. That said, it has been an unusual year for temperature in the Arctic. The closest year to what we have seen so far in 2013 appears to be 2010, which had an early drop below freezing. The high Arctic in year 2013 though, has never gotten above climatological normal, and that’s unusual.
I have created an animation for all years from 1958-2013, with a 1 second interval between frames and a 4 second pause on 2013:
WUWT reader Steve Oak writes:
For some inexplicable reason I follow the Daily Mean Temperatures North of 80 degree North. This started a few years ago when I was looking for information relating to the global temperature that was unadulterated so that I may form my own opinion as to the veracity of global warming claims and found this data set . While not “unadulterated” this looks to be fairly legitimate. I welcome further analysis.
The Danish Meteorological Institute, Center for Ocean and Ice produces a chart plotting the daily mean temp as a function of the day of the year against the average of daily mean temp as a function of the day of the year for the period form 1958 to 2002.
For the last 120 days or so the daily mean has remained below the 1958 to 2002 average. It has also now dropped below freezing.
While it cannot be assured that the daily mean will remain below freezing, the trend to this point and that there are so few remaining days before the average drops below freezing gives credence to that possibility.
Here is an explanation of the data set from the DMI, COI.
Calculation of the Arctic Mean Temperature
The daily mean temperature of the Arctic area north of the 80th northern parallel is estimated from the average of the 00z and 12z analysis for all model grid points inside that area. The ERA40 reanalysis data set from ECMWF, has been applied to calculate daily mean temperatures for the period from 1958 to 2002, from 2002 to 2006 data from the global NWP model T511 is used and from 2006 to 2010 T799 data are used and from 2010 to present the T1279 model data are used.
The ERA40 reanalysis data, has been applied to calculation of daily climate values that are plotted along with the daily analysis values in all plots. The data used to determine climate values is the full ERA40 data set, from 1958 to 2002.
More information can be found at:
Whether or not this early temperature drop translates into an early increased Arctic ice extent or melting remains highly uncertain, as there is a polar storm weather event in progress that may break up sea ice as happened last year: NASA on Arctic sea ice record low – storm ‘wreaked havoc on the Arctic sea ice cover’
See this current animation of dewpoint temperature from Dr. Ryan Maue of WeatherBell. It shows moisture bands from the polar low rotating around the north pole.
(NOTE: you may have to click the image below to get it to animate on some browsers)
Keep up to date on the WUWT Sea Ice Page: http://wattsupwiththat.com/reference-pages/sea-ice-page/