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Posted at 10:45 AM ET, 07/ 1/2010

June 2010 sets warmth record in Washington D.C.

By Ian Livingston

* Is the heat returning for the 4th? Full Forecast *

The top 15 warmest Junes on record since 1871 in Washington, D.C. 2010 set a new record by a significant margin.

The speculation is over, it's official. Even with a somewhat chilled final day of the month, June 2010 finished as the warmest on record for both D.C. and Dulles. Our recent streak of hot weather ended up as one of the longest heat waves for this early in the season and contributed to a record-tying number of June days at or above 90 -- 7 of which finished above 95 and one at 100. Two daily record highs were set during the month as well.

Keep reading for more stats on our record warm June. And what does July usually offer?

With an average temperature of 80.6 degrees, Washington surpassed the old June record by over a degree, making it the warmest June since records began in 1871. At Dulles, where climate records are much shorter and date to 1963, the average temperature of 76.8 degrees beat the previous record of 76.1 degrees set back in 1994. Baltimore-Washington (BWI) was able to hit 100 two times in June and finish with an average temperature an astounding 7 degrees above normal but failed to set a new record for June warmth. Instead, BWI finished #2 for June, behind 1943 (avg: 79.8), with an average temperature of 78.8 degrees.

The top 15 Junes on record since 1872, ranked by days at or above 90 degrees at Washington, D.C.

D.C. finished the month with 18 days at or above 90 degrees, tying the total in 1943, the (now) third warmest June on record at D.C. When adding in the 2 occurrences in April and the 3 in May, D.C. has recorded 23 days of 90+ this year. With two full months left in meteorological summer, we are about 10 days off the typical June-August number and have already surpassed last year's total by 1.

Looking forward to July: D.C.'s long-term (1872-2009) average for July 90+ days is 11.7, while the shorter term (1971-2000) climate normal is 14.5 days. There is not a significant correlation between a warm June and a warm July. However, the pattern of recent appears to want to re-assert itself for at least a while. Starting this weekend, we should enter our next stretch of more days of 90+ heat.

Days at-or-above 90 through June 30 at National Airport: 6/29, 92F; 6/28, 97F; 6/27, 99F (record); 6/26, 95F; 6/25, 92F; 6/24, 100F (record); 6/23, 97F; 6/22, 96F; 6/21, 93F; 6/20, 95F; 6/19, 93F; 6/14, 91F; 6/13, 94F; 6/12, 93F; 6/10, 90F; 6/6, 91F; 6/5, 91F; 6/3, 92F; 5/31, 91F; 5/27, 93F; 5/26, 90F; 4/7, 90F; 4/6, 90F

By Ian Livingston  | July 1, 2010; 10:45 AM ET
Categories:  Local Climate  
Save & Share:  Send E-mail   Facebook   Twitter   Digg   Yahoo Buzz   StumbleUpon   Technorati   Google Buzz   Previous: Forecast: July comes in like a lamb!
Next: PM Update: Beautiful summer weather persists


And this makes today all the sweeter.

Posted by: FIREDRAGON47 | July 1, 2010 11:27 AM | Report abuse

I thought the summer of 1980 was supposed to be hot, but I don't see it listed here. Is my admittedly hazy recollection that far off?

Posted by: Murre | July 1, 2010 12:08 PM | Report abuse

Is the "average" temperature merely the mean of all the daily highs and lows? If so, this doesn't really take into account the number of hours (or even minutes) the air spends at a certain temperature between the daily minima and maxima.

Warm-up is faster in summer than in winter, when objects seem to lose heat more rapidly. If the summer warm-ups are faster, then the true average needs to take the daily high and low, and apply a scaling factor that accounts for more hours of that day spent above the average.

Posted by: ennepe68 | July 1, 2010 12:41 PM | Report abuse

Murre, 1980 heat was more heavily centered in July/Aug/Sept. So at this point it was not terribly hot compared to average.

Posted by: Ian-CapitalWeatherGang | July 1, 2010 12:49 PM | Report abuse

ennepe68, what difference does it make how they measure the temps? They have been using the same method since 1871 so the readings r consistant from yr 2 yr. Doesn't matter wether the high temp was for 30 sec or 30 mins, it' still the high temp 4 that day. If they start using a scaling factor now, then they would have 2 go all the way 2 1871 & change those reading inorder 2 stay consistant.

Posted by: VaTechBob | July 1, 2010 1:21 PM | Report abuse

23 days at 90+ this summer?

Isn't that more than all of last year?

Posted by: ah___ | July 1, 2010 2:08 PM | Report abuse

Isn't anyone going to make an igloo to lampoon global warming?

Posted by: falcon269 | July 1, 2010 2:10 PM | Report abuse

ah___, yes. There were 22 90+ last year at DC.

Posted by: Ian-CapitalWeatherGang | July 1, 2010 2:28 PM | Report abuse

indeed, june was pretty darn hot here in dc. what were june global temps like?

Posted by: walter-in-fallschurch | July 1, 2010 3:52 PM | Report abuse

all of you at the washington post should be careful with these weather related articles or Cuccinelli will be subpoenaing your emails!

Posted by: MarilynManson | July 1, 2010 3:53 PM | Report abuse

Walter, University of Alabama in Huntsville's data shows global temps were warm in June, but a decrease from the previous month.

At elevation outside Front Royal, the low this morning was 53F. Nice to see July start with a perfect 10...

Posted by: spgass1 | July 1, 2010 10:47 PM | Report abuse

thanks. i was thinking of the map with all the dots. here it is:

...but they don't have info for june up there yet.

Posted by: walter-in-fallschurch | July 2, 2010 8:45 AM | Report abuse

My goodness. That's the worst graph I've seen in quite a while. You know, if you formatted your horizontal axis as a date, instead of sorting the data descending, it would tell the story in a more coherent way. How about getting some help from some of your technical people on how to make a decent graph. It's abominable.

Posted by: TomBlue | July 4, 2010 8:44 AM | Report abuse

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