BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, JUNE 6, 2015 ALL TIMES ARE IN EASTERN STANDARD TIME OVERNIGHT SHOWERS GIVE WAY TO SLOWLY CLEARING SKIES TODAY A round of showers associated with a frontal system brought 0.06 inches of rain to the summit before dawn this morning. The rain had stopped by the first observation at 7:00 EST, but heavy fog remained in place. The fog lifted during the morning, and clouds have gradually broken up as the day has gone on. Several layers of clouds have been present for much of the day, with as many as four distinct layers observed. After another cool morning low of 51F, the temperature has risen to 65F for a high so far, which is well below average. The first five days of June have been more than ten degrees below average, in sharp contrast to our record warm May. Winds have been out of the NE again, and have been a little stronger today after very calm conditions for the past few days, with several gusts around 25mph. Today's Observations: 7 A.M. Weather: Sky obscured by dense fog Temperature: 53F; Dew Point: 53F; Wind: NNE at 7 kts Sea-level pressure: 29.88 ins. Hg, rising Visibility: 1/16 mile, dense fog 6-hr Max temp: 57F 6-hr Min temp: 51F 24-hr precip: 0.06 ins. BHO SA 1155 W2 X 1/16F 120/53/53/0207/988/ 8//// 52011 ASOS 60006 ASOS 70006 MANUAL 70006 10057 20051 10 A.M. Weather: Scattered stratocumulus (few moderate tops SW-W), scattered altocumulus, broken altostratus with altocumulus, overcast cirrus, few breaks in overcast SW Temperature: 62F; Dew Point: 56F; Wind: NNE at 12G18 kts Sea-level pressure: 29.93 ins. Hg, rising then rising more slowly Visibility: 40 miles BHO SA 1455 25 SCT 70 SCT E150 BKN 250 OVC 137/62/56/0212G18/993/ FEW MDT SC TOPS SW-W FEW BINOVC SW/ 8/571 51017 1 P.M. Weather: Scattered stratocumulus (few moderate tops SW), scattered altostratus, broken cirrus, few altocumulus distant E-SE Temperature: 65F; Dew Point: 52F; Wind: ENE at 13G20 kts Sea-level pressure 29.96 ins. Hg, rising then rising more slowly Visibility: 50 miles 6-hr Max temp: 65F 6-hr Min temp: 53F BHO SA 1755 25 SCT 150 SCT E250 BKN 50 145/65/52/0613G20/996/ FEW MDT SC TOPS SW FEW AC DSNT E-SE/ 8/571 51008 10065 20053 SUMMARY FOR FRIDAY, JUNE 5, 2015 TEMPERATURE (DEGREES F) MAX.....70 NORMAL.....72 MIN.....49 NORMAL.....54 MEAN....60 NORMAL.....63 DEPARTURE FROM 30-YEAR NORMAL........................-3 TOTAL DEPARTURE FOR THE MONTH.......................-52 [-10.6 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............5 DEPARTURE...........+1 TOTAL HEATING UNITS FOR THE MONTH..............65 DEPARTURE..........+43 TOTAL HEATING UNITS FOR THE SEASON...........6469 DEPARTURE.........+144 TOTAL HEATING UNITS LAST SEASON TO DATE......6413 DIFFERENCE.........+56 COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY..............0 DEPARTURE..........-2 TOTAL COOLING UNITS FOR THE MONTH..............0 DEPARTURE..........-9 TOTAL COOLING UNITS FOR THE SEASON............49 DEPARTURE.........+16 TOTAL COOLING UNITS LAST SEASON TO DATE.......19 DIFFERENCE........+30 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY..................17 NNE AT 2:21 P.M.* ASOS.......................17 NNE AT 2:09 P.M. DAVIS......................15 NNE AT 2:04 P.M. RMY 17 FASTEST MILE FOR YESTERDAY....................12 NNE AT 2:20 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE.................14 NE AT 2:22 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE................13 NNE AT 2:22 P.M. AVERAGE WIND SPEED AND DIRECTION..............6.3 ESE ASOS.......................6.4 DAVIS......................5.9 SE [138 deg.] * Last of several occurrences... PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.06 DEPARTURE....-0.11 ASOS...............0.06 TOTAL PRECIPITATION FOR THE MONTH...........1.55 DEPARTURE....+0.72 ASOS...............1.57 TOTAL PRECIPITATION FOR THE YEAR.......... 20.86 DEPARTURE....-2.44 ASOS...............N/A *** *** ASOS annual totals not available due to erroneous readings PRELIMINARY CLIMATE SUMMARY FOR JUNE CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/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 6/1 48/46/47/-15/0.69/0.0/000/00 32 NE RMY 34 6/2 47/44/46/-16/..../0.0/000/00 28 NNE RMY 28 6/3 59/44/52/-10/0.00/0.0/.../.. 16 ESE RMY 16 6/4 63/46/55/-8/0.00/0.0/.../.. 17 E RMY 16 6/5 70/49/60/-3/T/0.0/.../.. 17 NNE RMY 17 6/6 low since midnight is 51F; normal low is now 54F DAILY RECORDS FOR JUNE 2015 6/1- NEW RECORD LOW MAXIMUM TEMPERATURE OF 48F surpasses previous record of 51F in 2004 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR JUNE 6 HIGH 95F IN 1925 LOW 42F IN 1885, 1894, 1920, 1945 PRECIP 3.61 INS IN 2000 PEAK GUST 58 MPH NE IN 2000 RECORDS FOR JUNE 7 HIGH 93F IN 1999 LOW 40F IN 1932 PRECIP 4.01 INS IN 2006 PEAK GUST 58 MPH NE IN 1982 TODAY'S REPORT PREPARED BY: Jonathan O'Brien