September was above normal for temperature with a monthly mean of 3.7 deg. F above normal. There were only two daily maximums at or above 90 deg F. The high for the month was 90.7 deg. F recorded on September 5. The low for the month was 42.4 deg F, recorded on September 30. There were 93 heating degree days.
September was extremely rainy with over 8.2 inches of rainfall recorded. This was 4.22 inches above normal for September and has contributed to a 13.79 inch surplus for 2018. The maximum rainfall in a single day was 2.33 inches recorded on September 10. There were 14 days of rain >.01 in, 11 >.1 in and 2 >1 in.
September 2018 Data
The outlook for October.
Seasonable temperatures and slightly above normal rainfall for central Pennsylvania.
Meteorological Summer is officially over. Here is a brief summary of Jun 1-Aug 31 in Stormstown, PA:
Number of Days Max T >= 90 F: 6
Number of Days Max T >= 95 F: 0
Max T: 91.3 – July 3, 2018
Min T: 43.5.0 – June7, 2018
Jun Dep from Normal: -1.0
Jul Dep from Normal: -0.7
Aug Dep from Normal: 1.3
Heating Degree Days: 131
Cooling Degree Days: 590
Jun Precip: 4.70 “, 0.84” above normal
Jul Precip: 9.14″, 5.68″ above normal
Aug Precip: 5.52″, 1.38″ above normal
August was a slightly warm month for temperature. The monthly mean was 1.3 deg. F above normal. There were only two daily maximums at or above 90 deg F. The high for the month was 90.8 deg. F recorded on August 29. The low for the month was 49.0 deg F, recorded on August 24. There were 17 heating degree days.
August was rainy, but lower than July, with over 5 inches of rainfall recorded. This was over 1.38 inches above normal for August and has contributed to a 9 inch surplus for 2018. There were 13 days of rain >.01 in, 9 >.1 in and 1 >1 in. Highest single day’s rainfall was 2.01 inches.
July was a normal month for temperature. The monthly mean was 0.7 deg. F below normal. There were only three daily maximums at or above 90 deg F. The high for the month was 91.3 deg. F recorded on July 3. The low for the month was 49.1 deg F, recorded on July 8. There were 37.9 heating degree days.
July was very rainy with over 9 inches of rainfall recorded. This was over 5.5 inches above normal for July and has contributed to an 8 inch surplus for 2018. There were 15 days of rain >.01 in, 13 >.1 in and 3 >1 in. Highest single day’s rainfall was 1.23 inches.
Stormstown July 2018 Weather Data
During the past 5 days, it has rained 4.27 inches in Stormstown, PA. That is 0.81 inches above normal for the month of July. So far, it has rained 7.53 inches this month. That’s 4.07 inches above normal. More rain is forecast before the end of July.
This week, I installed a new UV sensor to my automated weather station. The plot from the first few days of operation appears below.
As you can see the UV intensity was significant. Sunscreen is recommended for indices of 3 or above.
Today, with precipitation in the forecast, I set up my mini-laboratory to measure the pH of the local rainfall in Stormstown, PA. First, I installed a standard rain gauge to collect rainwater.
I calibrated my pH meter, prior to taking any actual measurements, using standard reagents of pH of 4.0 and 6.86. I used a pH 7.0 reagent to verify.
After calibration, I waited for some rainfall and then collected my sample.
It had rained 0.20 inches over the past two days.
This was about 400 ml of liquid.
I measured the pH to be about 5.15, which is in the normal range for rainfall but still acidic. It is not considered to be acid rain.
The following is a graph comparing 2017 temperatures (the red line) with 2018 temperatures (the blue line). Temperatures are in deg F from March 11 to April 10. This shows how much colder than last year this spring has been so far.
The above is today’s upper level 300 mb chart. The 300 mb level, about 30,000 ft (9100 m) is where one would typically find the jet streams. The polar jet stream is clearly shown in the upper left portion of the chart. Arctic air has been dominating the northeastern US and is a reason for why the cold weather has been persisting this month.
The temperature in Stormstown dropped 55 F from Friday afternoon to Sunday morning. It was definitely shirtsleeve weather on Friday and now it’s a frigid 20 F. The low this morning was 5 F. Cold temperatures are expected for much of the week. High temperatures are expected to be above freezing on Thursday and Friday.