Chipperdog.comOctober 9th, 2015

Perfect Day with Fall on Horizon

September 14th, 2015 (Monday)

Today was a perfect September day and quite a change from the 3.34″ of heavy rain picked up last week. The dew point dropped into the 40’s providing a taste of fall air and there was also the cloudless sky as shown by the solar\UV plot below.

Days are now less than 12.5 hours long and the sun only reaches 53° above the horizon at Solar noon. Fall officially starts next Wednesday however Summer will return the rest of this week as temperatures will reach the mid-80’s.

Solar & UV Plot - Sep 14th, 2015

September Heat!

September 8th, 2015 (Tuesday)

Despite yesterday being the unofficial end of Summer today’s high reached 95 °F with a heat index of 99 °F. This temperature was the highest this Summer by 3 °F and shattered the daily station record of 90 °F from 2007. We’ve now had four 90-degree days during September while we had only six such days through August. September is now about 6 °F above normal but it is still very early.

Reasons for this late Summer heat is a very strong jet stream and the extremely dry conditions. The dry conditions allow the air to heat up very quickly (think desert). We’ve now gone 18 straight days without any measurable rainfall. The Reading airport also recorded a high of 95 °F just missing the county record of 96 °F from 1939.

The hottest day of the summer was July 19th when the temperature hit 92 °F and with a dew point of 79 °F it felt like 106 °F. The average daytime temperature that day was 85.1 °F while today’s average was 84.4 °F.

August 2015 Weather Summary

September 6th, 2015 (Sunday)

August 2015 was uneventful as far as weather goes in Berks county. The month was slightly above normal in temperature and was once again quite dry. The average temperature was 73.8 °F, which is 0.8 °F above normal. There were four 90-degree days which is typical based on station history. The high temperature of 92 °F occurred on the 17th while the low of 57 °F occurred on the 23rd and 29th. The coolest August at the station was last year at 70 °F and the warmest was 77 °F in 2005.

The monthly rainfall total was 2.15″ which is 50% of the station normal of 4.33″. The maximum daily rainfall of 1.20″ was recorded on the 20th. We accumulated a rainfall deficit of 4.34″ for the year by the end of the month and local vegetation is starting to see the effects. Despite the lack of rainfall there is currently no drought watch in effect.

Rainfall totals in other areas of the county were the following: Mohnton: 1.97″, Lincoln Park: 2.20″, Wyomissing: 2.31″, Reading Airport: 3.45″, West Reading: 2.38″, Laureldale: 3.81″, Fleetwood: 3.47″, Wernersville: 2.98″, Boyertown: 1.82″, Kutztown: 3.38″, Oley: 2.98″, Hamburg: 4.59″, and Alburtis: 2.53″.

Wind averaged 2.3 mph which is typical for August and the predominant wind direction was West South-West. The peak wind gust of 23 mph occurred on the 4th and there were 292 hours of calm winds recorded.

Sunshine hours totaled 225 hours which is well above our monthly average of 173 hours. A typical maximum daily solar reading was down to 921 w/m² and the maximum daily UV index averaged a typical 8.2.

County Records at the Reading Airport: None
Station All-Time Records Set: None

Note: Station normal and averages include the current year’s values and date back to 2004.

Note: Station rain totals other than the Reading Airport are from CoCoRaHS and are typically recorded at 9 AM so the totals may not align with ours if precipitation events occur at the end of the month or the beginning of the next month.

Hottest Day of Year

July 19th, 2015 (Sunday)

Sunday, July 19th was the hottest day of the year so far at CW4113. The temperature peaked at 92.0 °F (4:11 PM) with a maximum heat index of 106 °F at 2:32 PM and a sultry dew point maximum of 79 °F. Today was only the 3rd 90-degree day of the Summer where we typically have about 10 such days this far into the season. July is currently tracking about 2 °F below normal based on average temperature.

The drought watch for Berks was lifted on July 10th with 3 out of the 4 categories at or above normal. The ground water levels at the observation well are still well below normal. The plentiful rain we received in June and early July has recently disappeared. As of today we are 50% low on rainfall for July and 2.5″ below normal for the year.