IRI Climate Digest July
June Global Climate Summary
Climatological Background In June, the sun's maximum northward
location is achieved at 23.6 degrees north. Surface heating of the continents
has initiated summer monsoonal
systems or northern hemisphere warm season rains. In the Southern Hemisphere
setting in with fewer daylight hours and cooler temperatures. The southern
parts of South
Africa, Australia and South America are now in the path of mid latitude
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
Unusually warm conditions continued to dominate much of eastern and
central Asia as well as from the Caucasus eastward to Afghanistan.
Europe: The Iberian Peninsula was much warmer than average
in June while near to slightly below average temperatures prevailed elsewhere.
Asia: Temperatures continued well above average across the Central
Siberian Uplands while near average temperatures returned to central Russia
after an unusually warm May. Temperatures were well above average
across north-central China eastward to the Korean Peninsula and Japan.
Africa: From Senegal northward to Morocco, areas along
the Atlantic coast of West Africa were much warmer than average in June.
Australia: In contrast to the previous month, much of
eastern Australia was unseasonably warm in June from Queensland southward
to New South Wales.
North America: Unusually warm conditions persisted across
much of the southwestern United States. Eastern Canada continued
to be unseasonably warm while southern sections of Alaska saw an abrupt
shift to above average temperatures in June.
South America: In northern Argentina and much of Paraguay
June brought unseasonably warm conditions.
Temperature Difference from the 1961-1990 mean, with data from NCEP
Climate Prediction Center, CAMS.
June marked a vigorous onset to the summer monsoon in southern Asia
and some limited drought relief to northern Pakistan. Rainfall continued
to be well below average across southwest Australia and New Zealand.
Asia: A vigorous, and early, onset of the South Asia summer monsoon
brought much needed rainfall to sections of drought-stricken northern Pakistan
and above-average precipitation to most of central and northern India.
Above average rainfall across eastern sections of the North China Plain
helped ease drought conditions although western areas continued to be unusually
dry. Beneficial rains fell across much of South Korea helped to ease
unusually dry conditions there.
Africa: Near average rainfall fell across much
of the Sahel in West Africa, although unusually dry conditions continued
across portions of southern and central Senegal and Guinea Bissau.
In East Africa rainfall was somewhat above average across southern and
western Kenya as well as Uganda. Unusually dry conditions were observed
across much of southern Ethiopia.
South America: Heavy rainfall fell across much of Uruguay
and northern Brazil. Much of Colombia and western Venezuela were
unusually dry in June.
North and Central America: Unusually wet conditions prevailed
along the east and Gulf coasts of the United States as well as most of
eastern Canada. Precipitation was well below average across south-central
Alaska. Rainfall was well below average across much of Mexico and
Europe: Unseasonably dry across the Iberian Peninsula and the
Australia and New Zealand: Rainfall continued below average
across southwestern West Australia as well as Coastal Queensland and New
South Wales. Above average rainfall fell across interior sections
of South Australia.
Precipitation Difference from 1961-1990 mean, with data from NCEP
Climate Prediction Center, CAMS-OPI.
Tropics: Sea surface temperatures (SSTs) remained
near average across the central and eastern equatorial Pacific while below
average SSTs persisted along coastal waters of western South America.
Overall, there has been little change in the equatorial Pacific from the
previous month and most numerical prediction models are predicting near-neutral
to slightly warmer than average conditions to continue over the next 6
to 9 months.
Much of the tropical Indian Ocean continues to be warmer than average
while SSTs in the tropical Atlantic are slightly warmer than average in
the tropical North Atlantic and in the Gulf of Guinea.
Mid latitudes: In the North Pacific, unusually warm waters
cover much of western areas at low latitudes with below average SSTs located
across much of the north. In the South Pacific, above average SSTs
continue to the east of Australia and in central sections. In the
North Atlantic, a broad band of above average SSTs extended from the West
Indies northeastward to Europe.
Monthly Sea Surface Temperature Difference from the 1950-1979 mean,
with data from the Environmental Modeling Center, NCEP/NOAA.