IRI Climate Digest February
January Global Climate Summary
In January, mid-summer monsoon
systems are usually at their peak in the Southern Hemisphere over southern
Africa, Australia and Indonesia, and South America. In the Northern Hemisphere
deep winter has set in, with strong north-south temperature differences
driving the mid-latitude jet stream and storm systems.
Monthly Mean Temperature (1961-1990), data from the Climate Research
Unit, University of East Anglia
Monthly Mean Precipitation (1961-1990), data from the
Climate Research Unit, University of East Anglia
Temperatures Over Land
Unusually warm conditions persisted across much of Europe for the fourth
consecutive month while an unseasonably cold winter continued across eastern
Asia. Much of Canada and the east-central United States saw an abrupt
shift to above average temperatures during January.
Europe: Temperatures continued above average across most
of the region with departures of over 6 C in eastern Scandinavia.
Asia: Unseasonably cold from the east of the Urals eastward
to the Sea of Okhotsk. Temperatures dropped to as low as -50 C in
sections of Mongolia and Siberia. Temperatures were well above average
across central China southward to Indonesia.
Africa: In a pattern similar to that of last month,
warmer than average conditions continued along coastal regions of West
and North Africa.
Australia: Above average temperatures prevailed across
most of southern Australia. Temperatures were as much as 5 C
above average across South Australia into New South Wales.
North America: Temperatures increased dramatically over
west-central Canada from the previous month with departures of over 10
C to the east of the Canadian Rockies. Above average temperatures
were also seen across the north-central United States.
|Temperature Difference from the 1961-1990 mean, with
data from NCEP Climate Prediction Center, CAMS.
Continued wet across the western Iberian Peninsula. Drier conditions
brought relief to an unusually wet rainy season in eastern Australia.
Europe: Above average rainfall from northern Portugal to
western France. Unusually wet from north-central Italy eastward to
Africa: Beneficial rainfall was above average across southern
Kenya, Tanzania and much of the southern Congo Basin. Rainfall totals
were below average from Botswana and Zimbabwe southward into northern South
Australia: Rainfall was above average mainly along coastal
regions of Western Australia and the Northern Territory. Drier than
average conditions brought relief to previously flooded regions of Queensland.
South America: Above average rainfall across much of northern
Brazil and northern Bolivia. Above average rainfall was also seen
across northern Argentina. Northeast Brazil was unusually dry.
North America: Below average rainfall was observed across
most of the eastern United States.
|Precipitation Difference from 1961-1990 mean, with
data from NCEP Climate Prediction Center, CAMS-OPI.
Tropics: The weak La Nina conditions in the central and
eastern Pacific continued although the area extent of below average sea
surface temperatures decreased from the previous month. Ocean temperatures
warmed somewhat over the western Pacific while cooling was observed across
the central Indian Ocean.
Midlatitudes: Above average water temperatures persisted
to the south of Australia and in the central South Atlantic. No major
changes were observed in the North Atlantic and Pacific oceans from December.
Monthly Sea Surface Temperature Difference from the 1950-1979 mean,
with data from the Environmental Modeling Center, NCEP/NOAA.