BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, JULY 25, 2015 ALL TIMES ARE IN EASTERN STANDARD TIME BACKDOOR COLD FRONT BRINGS COOL AND CLOUDY CONDITIONS Overcast skies and cool air were present for the 7 AM Observation with temperatures in the lower 60's. By the 1:00 PM EST observation, the clouds had given way to some sunny breaks as the pressure rose through the morning. The pressure had begun to fall by the afternoon though as temperatures approached 70 with dewpoints steady in the upper 50's. Today's Observations: 7 A.M. Weather: Overcast AltoStratus, Hazy Temperature: 62F; Dew Point: 58F; Wind: N at 9 kts Sea-level pressure: 30.04 ins. Hg, rising, then more slowly Visibility: 10 miles, Hazy 6-hr Max temp: 63F 6-hr Min temp: 62F 24-hr precip: T BHO SA 1155 010 OVC 10 174/62/58/0409/004 8/6// 51017 10063 20062 10 A.M. Weather: Broken Altocumulus, Few Cirrus, Hazy Temperature: 64F; Dew Point 57F; Wind: N at 906 kts Wind: Light Sea-level pressure: 30.07 ins. Hg, rising Visibility: 20 miles, Hazy BHO SA 1455 E015 BKN 20 184/64/57/0506/007 FEW CI ALQDS WND LGT 8/064 53010 1 P.M. Weather: Scattered Altocumulus, Scattered Cirrus. Hazy Temperature: 69F; Dew Point: 58F; Wind: Variable at 6 kts, Wind: Light and variable Sea-level pressure: 30.06 ins. Hg, and rising Visibility: 35 miles, Hazy 6-hr Max temp: 69F 6-hr Min temp: 66F BHO SA 1755 030 SCT 250 SCT 181/69/58/VRB06G16/006 WND LGT AND VRB 8/094 56003 10069 20066 SUMMARY FOR FRIDAY, JULY 24, 2015 TEMPERATURE (DEGREES F) MAX.....80 NORMAL.....81 MIN.....60 NORMAL.....63 MEAN....70 NORMAL.....72 DEPARTURE FROM 30-YEAR NORMAL........................-2 TOTAL DEPARTURE FOR THE MONTH.......................+22 [+0.8 DEGREES/DAY] COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY...............5 DEPARTURE..........-3 TOTAL COOLING UNITS FOR THE MONTH.............181 DEPARTURE.........+12 TOTAL COOLING UNITS FOR THE SEASON............319 DEPARTURE.........+21 TOTAL COOLING UNITS LAST SEASON TO DATE.......298 DIFFERENCE........+21 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY...................23 N AT 12:00 P.M. ASOS........................26 N AT 12:00 P.M. DAVIS.......................24 N AT 11:58 A.M. RMY 25 FASTEST MILE FOR YESTERDAY.....................14 N AT 12:00 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE..................17 N AT 12:01 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE.................16 N AT 11:58 A.M. AVERAGE WIND SPEED AND DIRECTION...............7.8 NW ASOS........................8.0 DAVIS.......................5.3 NW [311 deg.] * Last of several occurrences... PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.00 DEPARTURE.....-0.13 ASOS...............0.00 TOTAL PRECIPITATION FOR THE MONTH...........2.99 DEPARTURE.....+0.00 ASOS...............3.01 TOTAL PRECIPITATION FOR THE YEAR...........27.26 DEPARTURE.....-2.70 ASOS...............N/A *** *** ASOS annual total not available due to erroneous readings PRELIMINARY CLIMATE SUMMARY FOR JULY CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/RMY GUST RMY: R.M. Young wind gust recording system TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized 7/1 80/63/72/+2/0.59/466/51 30 SSE RMY 33 TSTM 7/2 78/60/69/-1/0.00/721/79 23 WNW RMY N/A 7/3 79/58/69/-2/0.00/867/95 17 SSW RMY 17 7/4 74/61/68/-3/T/109/12 16 S RMY N/A 7/5 82/58/70/-1/0.00/865/95 20 WSW RMY 20 7/6 85/64/75/+4/0.00/755/83 20 S RMY 21 7/7 84/65/75/+4/0.02/445/49 35 S RMY 40 7/8 87/68/78/+6/T/372/41 23 NE RMY N/A 7/9 73/61/67/-5/..../390/43 24 NE RMY 25 7/10 80/59/70/-2/..../535/59 18 W RMY N/A TSTM 7/11 84/61/73/+1/0.00/868/96 21 NW RMY 19 7/12 88/67/78/+6/0.00/813/90 20 W RMY 17 7/13 82/66/74/+2/0.00/424/47 21 E RMY 20 7/14 81/64/73/+1/..../396/44 25 S RMY 27 7/15 84/61/73/+1/..../.../.. 24 ENE RMY 26 7/16 72/56/64/-8/0.00/.../.. 25 NNE RMY 24 7/17 79/56/68/-4/0.00/.../.. 21 S RMY N/A 7/18 76/63/70/-2/0.16/.../.. 29 SSW RMY 30 TSTM 7/19 89/68/79/+7/0.01/.../.. 25 SSW RMY 27 7/20 90/73/82/+10/0.00/.../.. 24 W RMY 26 7/21 87/70/79/+7/T/.../.. 24 W RMY 25 7/22 82/64/73/+1/T/.../.. 24 WNW RMY 26 7/23 81/62/72/+0/0.00/.../.. 22 W RMY 23 7/24 80/60/70/-2/0.00/.../.. 23 N RMY 25 7/25 low since midnight is 59F; normal low is now 63F DAILY RECORDS FOR JULY 2015 7/10- NEW RECORD DAILY PRECIPITATION PENDING OF X.XX in 2015 surpasses previous record of 1.68 in. in 1933 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR JULY 25 HIGH 94F IN 1963,1987 LOW 51F IN 1901,1953 PRECIP 2.25 INS IN 1990 PEAK GUST 88 MPH NW IN 1972 RECORDS FOR JULY 26 HIGH 97F IN 1963 LOW 47F IN 1920 PRE 2.05 INS IN 1899 WIND 74e MPH NNW IN 1940 TODAY'S REPORT PREPARED BY: Robert Millette