BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY, APRIL 14, 2017   ALL TIMES ARE IN EASTERN STANDARD TIME HIGH PRESSURE AND LIGHT WINDS BRING DRY MILD AIR TO GREAT BLUE HILL High pressure moved in bringing dry air and light winds to Great  Blue Hill. Temperatures have been slightly above normal but more seasonable than the high temperatures we saw last week. We had a high of 62F by 1PM. Normal for today is 55F.   With a shift of winds from the south to the northwest the haze we saw  earlier this week has cleared. Skies also cleared throughout the  day and we had excellent visibility of 80 miles during each of our  observations.  Today's Observations: 7 A.M. Weather: Scattered cirrus Temperature: 45F; Dew Point: 28F; Wind: NNW at 7 kts Sea-level pressure: 30.39 ins. Hg, rising unsteadily  Visibility: 80 miles 6-hr Max temp: 45F 6-hr Min temp: 40F 24-hr precip: 0.00 in. 24-hr snowfall: 0.0 in. BHO SA 1155 E250 SCT 80 292/45/28/3407/039/ 8/004 52013 10045 20040 10 A.M. Weather: Sky clear, few cumulus ESE and few cirrus NE-SSW Temperature: 56F; Dew Point: 24F; Wind: N at 7 kts, Sea-level pressure: 30.40 ins. Hg, increasing the steady Visibility: 80 miles BHO SA 1455 CLR 80 295/56/24/3607/040/ FEW CU ESE FEW CI NE-SSW  8/101 52003  1 P.M. Weather: Few cumulus ESE-N Temperature: 62F; Dew Point: 24F; Wind: Variable at 6 kts, Wind speed: Light Sea-level pressure: 30.37 ins. Hg, decreasing, then more rapidly Visibility: 80 miles 6-hr Max temp: 62F 6-hr Min temp: 46F BHO SA 1755 CLR 80 283/62/24/VRB06/037/ FEW CU ESE-N/ 8/100 57012  10062 20046  SUMMARY FOR THURSDAY, APRIL 13, 2017   TEMPERATURE (DEGREES F) MAX.....58   NORMAL.....55 MIN.....40   NORMAL.....37 MEAN....49   NORMAL.....46 DEPARTURE FROM 30-YEAR NORMAL.........................+3 TOTAL DEPARTURE FOR THE MONTH........................+55 [+4.2 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY..............16   DEPARTURE..........+3 TOTAL HEATING UNITS FOR THE MONTH.............229   DEPARTURE.........-52 TOTAL HEATING UNITS FOR THE SEASON...........5131   DEPARTURE........-634 TOTAL HEATING UNITS LAST SEASON TO DATE......4735   DIFFERENCE.......+396 COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL HEATING UNITS FOR YESTERDAY...............3   DEPARTURE..........+3 TOTAL HEATING UNITS FOR THE MONTH...............3   DEPARTURE..........+3 TOTAL HEATING UNITS FOR THE SEASON..............3   DEPARTURE..........+3 TOTAL HEATING UNITS LAST SEASON TO DATE.........0   DIFFERENCE.........+3 PEAK GUST AND AVERAGE WIND SPEED (MPH)  PEAK WIND GUST FOR YESTERDAY...................28  WNW  AT 12:53 A.M.                    AERO........................31  NW   AT  1:35 P.M.                    ASOS........................29  NNW  AT  3:44 P.M.                    DAVIS.......................26  NW   AT 12:54 P.M. RMY 30 FASTEST MILE FOR YESTERDAY.....................19  WNW  AT 12:26 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE..................20  WNW  AT 12:27 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE.................19  WNW  AT 12:27 P.M. AVERAGE WIND SPEED AND DIRECTION.............11.3  NW                    ASOS......................10.3                    DAVIS......................9.9 NNW [329 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.16                          ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........4.27  DEPARTURE......+2.07                          ASOS..............4.28 TOTAL PRECIPITATION FOR THE YEAR..........18.39  DEPARTURE......+2.19                          ASOS...............N/A *** *** ASOS annual total not available due to erroneous readings SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE.......-0.1 TOTAL SNOWFALL FOR THE MONTH................2.7  DEPARTURE.......+0.7 TOTAL SNOWFALL FOR THE SEASON..............66.4  DEPARTURE.......+4.7 PRELIMINARY CLIMATE SUMMARY FOR APRIL CALENDAR DAY DATA DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST AERO: Aerovane wind recording system 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 M:    Missing data 4/1  35/31/33/-8/2.21/2.7/000/00           40 ENE AERO 41 ENE RMY 41 4/2  53/30/42/+1/0.00/0.0/.../..           32 NW  AERO 33 NW  RMY 34 4/3  60/35/48/+6/0.00/0.0/.../..           21 W*  AERO 20 NW  RMY N/A 4/4  42/35/39/-3/0.78/0.0/.../..           41 ESE AERO 43 ESE RMY 42 4/5  41/35/38/-5/0.00/0.0/000/00           21 NNW AERO 20 NNW RMY N/A 4/6  55/35/45/+2/1.27/0.0/000/00           35 SSE AERO 37 S   RMY 37  TSTM 4/7  53/38/46/+3/0.00/0.0/.../..           43 SSW AERO 47 SSW RMY 48 4/8  50/34/42/-2/0.00/0.0/.../..           37 WNW AERO 40 WNW RMY 39 4/9  65/34/50/+6/0.00/0.0/.../..           23 W   AERO 23 W   RMY N/A 4/10 77/45/61/+16/0.00/0.0/.../..          37 S   AERO 37 S   RMY 39 4/11 85/50/68/+23/0.00/0.0/.../..          28 S   AERO 28 S   RMY 30 4/12 68/47/58/+13/0.01/0.0/.../.. 26 WNW AERO 28 WNW RMY N/A 4/13 58/40/49/+3/0.00/0.0/.../..           28 WNW AERO 31 NW  RMY 30  4/13 Low temp since midnight is 40F; normal low is now 37F DAILY RECORDS FOR APRIL 2017 4/11/17: DAILY RECORD MAXIMUM TEMPERATURE OF 85F,          BREAKS PREVIOUS RECORD OF 78F SET IN 1945 4/11/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 50F,          TIES WITH PREVIOUS RECORD SET IN 1955 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR APRIL 14 HIGH 80 IN 1945 LOW 21 IN 1923 PRECIP 2.22 IN. IN 1895 SNOWFALL 8.4 IN. IN 1953 PEAK GUST 71e MPH W IN 1943 RECORDS FOR APRIL 15 HIGH 81 IN 1896 LOW 23 IN 1943 PRECIP 1.75 IN. IN 2007 SNOWFALL 1.0 IN. IN 1916, 1962 PEAK GUST 66 MPH E IN 2007        TODAY'S REPORT PREPARED BY: Kaitlin Ann Geagan