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Sunday, July 05, 2009
June Global Temperatures Drop Again, 8 Year Downtrend Continues

By Joseph D’Aleo

Dr. Roy Spencer announced on his blog that June’s anomaly globally using the Aqua satellite dropped to 0.001C. This continues the downtrend that started after 2001.

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See larger image here.

Roy notes: June 2009 saw another - albeit small drop in the global average temperature anomaly, from +0.04 deg. C in May to 0.00 deg. C in June, with the coolest anomaly (-0.03 deg. C) in the Southern Hemisphere. The decadal temperature trend for the period December 1978 through June 2009 is now at +0.12 deg. C per decade.

NOTE: A reminder for those who are monitoring the daily progress of global-average temperatures here:

(1) Only use channel 5 ("ch05"), which is what we use for the lower troposphere and middle troposphere temperature products.
(2) Compare the current month to the same calendar month from the previous year (which is already plotted for you).
(3) The progress of daily temperatures (the current month versus the same calendar month from one year ago) should only be used as a rough guide for how the current month is shaping up because they come from the AMSU instrument on the NOAA-15 satellite, which has a substantial diurnal drift in the local time of the orbit. Our ‘official’ results presented above, in contrast, are from AMSU on NASAís Aqua satellite, which carries extra fuel to keep it in a stable orbit. Therefore, there is no diurnal drift adjustment needed in our official product.

Icecap Notes: It was the 15th coldest June in the 31 years of satellite record keeping since 1979. The first half of the month was extremely cold and even snowy in south Central Canada and the northern United States. In snowed in North Dakota and in California and northern New England in early June. It was also unusually cold in the southwest - well below the normal (often 10-20 degrees) in places like Palm Springs, CA. In general, the desert southwest was unusually mild. Phoenix had 15 straight days with highs below 100F, the first time in June since 1913.

In contrast feeding off the dry soils from two years of La Nina, June, especially the second half was very hot in the southern plains and the heat expanded north and east a bit after mid-month before being suppressed again by months end.

In the northeast, the month was unusually cold, cloudy and wet. In Boston it was 4.7F below normal in a tie for 6th coldest June (with 1982) in 138 years of record keeping, all the other years were before 1916. It was just short of two standard deviations colder then normal. The NWS spot checked the average maximum temp at Boston for the month and it appears this is the second coldest average high temp since 1872. 1903 is the record. A trace or more of rain fell on 22 days of the month. Measurable (0.01 inches or more) occurred on 16 days just short of the record of 18 set in 1942.

At Blue Hill Observatory in Milton, MA, just southwest of Boston, the month of June had between 26 and 27% of the possible bright sunshine. Normal for June is 55% and the gloomiest June in 1903 had just 25% of the possible sunshine. Second place had been June, 1998, with 36%. So, this month has taken over 2nd place, not an enviable distinction for vacationers. So little sunshine and so much cool temperatures that we have heard some reports that swamp maples in parts of Maine showing fall colors!

New York City’s Central Park was also cool, cloudy and wet. The month averaged 3.7F below normal and tied with 1897 as the 8th coldest since 1869 (151 years). It rained in 23 days of the month and ended up as the second wettest June ever falling short of 1927. Recall Joe Romm of Climate Progress had blamed the rains at the US Open on global warming and chuckled the heat waves would make the climate debate in DC all that much more exciting.

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See larger image here.

The preliminary June monthly anomaly is shown below (CPC).

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See larger image here.

In other parts of the world, Southern Brazil had one the coldest June’s in decades and New Zealand has had unusual cold and snow again this year after a banner year there and in the mountains of southern Australia last year. The Mt. Lyford Ski Area is experiencing some of the best early snow itís ever seen. With a current 135cm average base on the slopes along with 50cm of snow fall earlier this week and an additional 5cm of windblown powder last night, ski area operator Hamish Simpson says there are “plenty of fresh tracks to be had”. “We have got the best early season snow in years,” said Mr Simpson. “Even better than last year - wall to wall white! The Terako rope has 100% cover with plenty of fresh tracks to be had.” Photo Mt. Dobson.

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Posted on 07/05 at 08:36 PM
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