July 2018 Weather Summary

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

Measurement of the pH of Rain

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.

pH-1

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.

pH-2

After calibration, I waited for some rainfall and then collected my sample.

P1030560

It had rained 0.20 inches over the past two days.

P1030561

This was about 400 ml of liquid.

P1030564

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.

pH Scale