BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY WEDNESDAY, MAY 29, 2019 ALL TIMES ARE IN EASTERN STANDARD TIME MOSTLY CLOUDY WITH LIGHT WIND AND IMPROVING VISIBILITY IN THE AFTERNOON.... Due to dissipating fog, visibility increased from 5 miles this morning to an excellent 80 miles by the 1 P.M. observation. Rain yesterday afternoon left 0.31 inches in the gauge, measured at 7 A.M. Wind has remained light, shifting from north to east throughout the day. The high so far today is 50F, 20 degrees below the daily normal maximum of 70F. The low since midnight is 45F, 7 degrees below the normal minimum of 52F.   Today's Observations: 7 A.M. Weather: Overcast stratus Temperature: 46F; Dew Point: 46F; Wind: N at 7 kts Sea-level pressure: 29.79 ins. Hg, rising steadily Visibility: 5 miles, fog 6-hr Max temp: 48F 6-hr Min temp: 45F 24-hr Precip: 0.31 ins. 24-hr snowfall: 0.0 ins. Snow depth: 0 ins. BHO SA 1155 E10 OVC 5F 089/46/46/3607/979/ 8/6// 70031 53022 10048 20045 10 A.M. Weather: Overcast stratus Temperature: 48F; Dew Point: 46F; Wind: N at 4 kts, Wind: Light   Sea-level pressure: 29.80 ins. Hg, rising steadily Visibility: 35 miles 3-hr Precip: 0.00 ins.   BHO SA 1455 E10 OVC 35 091/48/46/0104/980/ WND LGT/ 8/6// 51002 1 P.M. Weather: Broken stratus Temperature: 50F; Dew Point: 46F; Wind: ENE at 3 kts, Wind: Light and variable Sea-level pressure: 29.82 ins. Hg, rising steadily Visibility: 80 miles 6-hr Max temp: 50F 6-hr Min temp: 45F 6-hr Precip: 0.00 ins. BHO SA 1755 E15 BKN 80 097/50/46/0703/982/ WND L/V/ 8/6// 51006 10050 20045 SUMMARY FOR TUESDAY, MAY 28, 2019 TEMPERATURE (DEGREES F) MAX.....57   NORMAL.....70 MIN.....48   NORMAL.....51 MEAN....53   NORMAL.....61 DEPARTURE FROM 30-YEAR NORMAL........................-8 TOTAL DEPARTURE FOR THE MONTH.......................-49 [-2.0 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY..............12   DEPARTURE.........+6 TOTAL HEATING UNITS FOR THE MONTH.............289   DEPARTURE........+37 TOTAL HEATING UNITS FOR THE SEASON...........6190   DEPARTURE........-97 TOTAL HEATING UNITS LAST SEASON TO DATE......5847   DIFFERENCE......+343 COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY...............0   DEPARTURE.........-1 TOTAL COOLING UNITS FOR THE MONTH...............8   DEPARTURE........-10 TOTAL COOLING UNITS FOR THE SEASON..............8   DEPARTURE........-12 TOTAL COOLING UNITS LAST SEASON TO DATE........52   DEPARTURE........-44 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY....................26 E    AT  1:13 P.M.                    AERO.........................22 ESE  AT 10:38 A.M.                    ASOS.........................26 E    AT  1:11 P.M.                    DAVIS........................26 E    AT  1:10 P.M.  RMY 25 FASTEST MILE FOR YESTERDAY......................22 E    AT  1:11 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................18 E    AT  1:13 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................20 E    AT  1:08 P.M. AVERAGE WIND SPEED AND DIRECTION...............10.5 E                    ASOS........................10.4                    DAVIS.......................10.9 E [83 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.31  DEPARTURE.......+0.16                          ASOS..............0.29 TOTAL PRECIPITATION FOR THE MONTH..........4.05  DEPARTURE.......+0.39                          ASOS..............3.85 TOTAL PRECIPITATION FOR THE YEAR..........25.23  DEPARTURE.......+2.02                          ASOS.............25.06 PRELIMINARY CLIMATE SUMMARY FOR MAY 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 05/01 57/40/49/-4/0.00/0.0/.../..           21 S   AERO 21 SSE  RMY 21 05/02 45/41/43/-10/0.02/0.0/.../..          21 NE  AERO 21 SSW  RMY 20 05/03 60/43/52/-1/..../0.0/.../..           23 S   AERO 23 S    RMY 22 05/04 54/46/50/-4/..../0.0/.../..           14 ENE AERO 14 ENE  RMY 17 05/05 52/44/48/-6/0.00/0.0/.../..           18 NE  AERO 20 NE   RMY N/A 05/06 58/44/51/-3/..../0.0/.../..           25 NE  AERO 26 ENE  RMY 24 05/07 72/41/57/+2/0.12/0.0/.../..           30 S   AERO 29 S    RMY 30 05/08 67/48/58/+3/0.00/0.0/.../..           20 NE  AERO 20 NE   RMY 19 05/09 60/43/52/-3/0.00/0.0/.../..           21 SE  AERO 21 E    RMY 22 05/10 61/46/54/-1/0.16/0.0/.../..           35 S   AERO 37 S    RMY 37 05/11 68/50/59/+3/..../.../.../..           26 NW  AERO M  M    RMY N/A 05/12 50/36/43/-13/0.68/.../.../..          30 ENE AERO M  M    RMY N/A 05/13 52/38/45/-11/..../.../.../..          35 E   AERO M  M    RMY 34 05/14 44/38/41/-16/..../.../.../..          26 NNE AERO M  M    RMY 25 05/15 58/40/49/-8/..../.../.../..           28 NW  AERO M  M    RMY 28 05/16 68/46/57/0/..../.../.../..            17 NW  AERO M  M    RMY 19 05/17 64/49/57/0/..../.../.../..    22 WNW AERO 21 WNW  RMY 25 05/18 72/49/61/+3/..../.../.../..           26 SSE AERO 25 SSE  RMY 29 05/19 69/50/60/+2/..../.../.../..           39 S   AERO 43 SSE  RMY 42 05/20 85/52/69/11/..../.../.../..    35 SW  AERO 40 SW   RMY 39 05/21 69/52/61/+2/0.00/.../.../..           40 NW  AERO 46 NW   RMY 45 05/22 68/49/59/0/0.00/.../.../..            32 NNW AERO 29 NW   RMY N/A 05/23 68/48/58/-1/..../.../.../..    36 SSW AERO 37 SSW  RMY 40 05/24 68/47/58/-1/..../.../.../..    47 NW  AERO 47 NW   RMY 51 05/25 75/47/61/+1/..../.../.../..    M  M   AERO 35 SSW  RMY 39 05/26 85/49/67/+7/..../0.0/.../..           40 W   AERO 38 W    RMY 39 05/27 76/57/67/+7/..../0.0/.../..           30 NE  AERO 22 NE   RMY 27 05/28 57/48/53/-8/..../0.0/.../..           26 E   AERO 22 ESE  RMY 25 05/29 Low temp since midnight is 45F; normal low is 52F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR MAY 29 HIGH 93F IN 1919 LOW 35F IN 1902 PRECIP 1.63 INS 1990 PEAK GUST 55e MPH NNW IN 1943, WNW IN 1945 RECORDS FOR MAY 30 HIGH 93F IN 1929 LOW 39F IN 1949,1961 PRECIP 1.47 INS 1948 PEAK GUST 61e MPH NW IN 1945 TODAY'S REPORT PREPARED BY: Benjamin Turner