BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY MONDAY, MARCH 23, 2020 ALL TIMES ARE IN EASTERN STANDARD TIME INCREASING CLOUDS THIS MORNING, LEADS TO SNOW DEVELOPING THIS AFTERNOON.... After a cold, but dry weekend, a storm system approaching the region to our south has lead to increasing cloud cover this morning, and now to the development of snow, which began falling just after our 1pm observation. As would be expected with snowfall moving into the area, visibility has decreased significantly as the day has progressed. We started the day with 60 miles, down to a prevailing visibility of 30 miles at 1pm, but only 10 miles to the southwest and 15 miles to the west as the snow moved in. As of 2pm EST, visibility was down to 1 mile in light to moderate snow. Any precipitation is welcomed at this point as we've been running quite the deficit since the start of the year. Total liquid precipitation for the year through 7am this morning was only 5.75 inches. This is -6.59 inches below normal to date. We will be adding to our snowfall totals for the 2019-2020 "winter" season and will have those stats for you tomorrow. The overnight low was 25F, this is 4 degrees below the normal low of 29F. The high so far today is 38F, 8 degrees below the normal max of 46F. Today's Observations: 7 A.M. Weather: Scattered stratocumulus, scattered altostratus, overcast cirrostratus Temperature: 29F; Dew Point: 21F; Relative Humidity: 72% Wind: SE at 8 kts Sea-level pressure: 30.64 ins. Hg: rising then falling Visibility: 60 miles 6-hr Max temp: 29F 6-hr Min temp: 25F 24-hr Precip:  0.00 ins. 24-hr Snowfall: 0.0 ins. BHO SA 1155 35 SCT 100 SCT E190 OVC 60 375/29/21/1208/064/ FEW BINOVC E THN SPTS INOVC ALQDS VIRGA S-W SUN DMLY VSBL/ 8/516 58019 10029 20025 10 A.M. Weather: Broken stratocumulus, overcast altostratus Temperature: 34F; Dew Point: 22F; Relative Humidity: 61% Wind: SE at 12G17 kts Sea-level pressure: 30.58 ins. Hg: falling, then more rapidly Visibility: 30 miles 3-hr Precip:  0.00 ins. 3-hr Snowfall: 0.0 ins. BHO SA 1455 E30 BKN 70 OVC 30 354/34/22/1212G17/058/ 8/52/ 57021 1 P.M. Weather: Broken stratocumulus, overcast nimbostratus Temperature: 36F; Dew Point: 25F; Relative Humidity: 63% Wind: SE at 10G18 kts Sea-level pressure: 30.46 ins. Hg: falling rapidly Visibility: 30 miles, 10 miles SW, 15 miles W 6-hr Max temp: 38F 6-hr Min temp: 29F 6-hr Precip:  0.00 ins. 6-hr Snowfall: 0.0 ins. BHO SA 1755 E25 BKN 50 OVC 30 315/36/25/1310G18/046/ VSBY SW 10 W 15 PRESFR/ 8/6// 53039 10038 20029 SUMMARY FOR SUNDAY, MARCH 22, 2020 TEMPERATURE (DEGREES F) MAX.....36   NORMAL.....46 MIN.....23   NORMAL.....28 MEAN....30   NORMAL.....37 DEPARTURE FROM 30-YEAR NORMAL................... -7 TOTAL DEPARTURE FOR THE MONTH..................+172 [+7.6 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............35  DEPARTURE....... +7 TOTAL HEATING UNITS FOR THE MONTH..............510  DEPARTURE......-172 TOTAL HEATING UNITS FOR THE SEASON............4650  DEPARTURE......-600 TOTAL HEATING UNITS LAST SEASON TO DATE.......5199  DEPARTURE......-549 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY....................23 NE  AT  7:53 A.M.                      AERO.........................24 NE  AT  8:04 A.M.                      ASOS.........................24 NE  AT  8:04 A.M.                    DAVIS........................24 NE  AT  8:04 A.M. RMY 23 FASTEST MILE FOR YESTERDAY......................17 N   AT 12:54 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................16 ENE AT 10:02 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................17 ENE AT 10:01 A.M. AVERAGE WIND SPEED AND DIRECTION.............. 9.3 ENE                                   ASOS....................... 9.2                    DAVIS...................... 9.9 ENE  [066 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.20                          ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........1.09  DEPARTURE......-2.83                          ASOS..............1.25 TOTAL PRECIPITATION FOR THE YEAR...........5.75  DEPARTURE......-6.59                          ASOS..............6.16 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE.......-0.4 TOTAL SNOWFALL FOR THE MONTH................1.2  DEPARTURE.......-8.9 TOTAL SNOWFALL FOR THE SEASON..............26.0  DEPARTURE......-31.1 PRELIMINARY CLIMATE SUMMARY FOR MARCH 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 03/01  33/15/24/-7/0.00/0.0/.../..         28 WNW AERO 28 WNW RMY 27 03/02  52/24/38/+7/T/T/.../..              40 S   AERO 39 S   RMY 41 03/03  64/45/55/+23/..../0.0/.../..        30 S   AERO 30 S   RMY N/A 03/04  50/38/44/+12/..../0.0/.../..        56 W   AERO 56 W   RMY 58 03/05  51/32/42/+10/0.00/0.0/.../..        31 W   AERO 31 NW  RMY 32 03/06  47/30/39/+7/..../.../.../..         46 NE  AERO 45 NE  RMY 46 03/07  43/26/35/+2/..../.../.../..         42 N   AERO 43 N   RMY 44 03/08  53/26/40/+7/0.00/0.0/.../..         31 W   AERO 30 W   RMY 28 03/09  72/40/56/+23/0.00/0.0/.../..        32 SW  AERO 32 SW  RMY 31 03/10  68/49/59/+26/0.00/0.0/.../..        48 WSW AERO 46 WSW RMY 49 03/11  56/37/47/+13/0.00/0.0/.../..        31 WNW AERO M  M   RMY 21 03/12  46/31/39/+5/..../0.0/.../..         21 SE  AERO 18 SE  RMY N/A 03/13  59/38/49/+15/..../0.0/.../..        46 WNW AERO 44 WNW RMY 46 03/14  51/35/43/+8/0.00/0.0/.../..         37 W   AERO 36 W   RMY 35 03/15  47/28/38/+3/0.00/0.0/.../..         28 NW  AERO 28 NW  RMY N/A 03/16  36/22/29/-6/0.00/0.0/.../..         21 NE  AERO 21 ESE RMY 21 03/17  43/28/36/0/..../0.4/.../..          29 W   AERO 30 W   RMY 29 03/18  54/31/43/+7/..../0.0/.../..         26 S   AERO 26 S   RMY 26 03/19  43/37/40/+4/..../0.0/.../..         36 E   AERO 35 E   RMY 34 03/20  66/37/52/+15/..../0.0/.../..        48 W   AERO 48 W   RMY 46 03/21  55/29/42/+5/0.00/0.0/.../..         45 W   AERO 48 W   RMY N/A 03/22  36/23/30/-7/0.00/0.0/.../..         23 NE  AERO 24 NE  RMY 23 03/23 The low since midnight is 25F, daily normal minimum is 29F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated):   RECORDS FOR MARCH 23 HIGH 78 IN 1938 LOW 3 IN 1934 PRE 2.52 INS. IN 2010 SNOW 3.0 INS. IN 1977 WIND 78e MPH W IN 1940 RECORDS FOR MARCH 24 HIGH 70 IN 1920 LOW 6 IN 1906 PRECIP 1.51 INS. IN 1956 SNOWFALL 12.3 INS. IN 1956 PEAK GUST 71 MPH W IN 1968 TODAY'S REPORT PREPARED BY: Matt Douglas