BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA MONDAY, MAY 3, 2021 ALL TIMES ARE IN EASTERN STANDARD TIME SUNRISE: 0436E SUNSET:  1846E COOLER WITH A MIX OF SUN AND CLOUDS.... Today is cooler compared to yesterday thanks to an onshore wind and an increase in a thickening cloud cover. Visibility has been between 50-60 miles today with a bit of a haziness, likely due in part to pollen in the air. Wind has been mostly on the light side, with an occasional gust approaching 20 mph. The average speed sicne 7 A.M. has only been around 7 mph. Unlike yesterday's prevailing direction of west-southwest, today's prevailing direction so far has been northeast. This of course is responsible for cooler temperatures compared to yesterday. The high so far today is 67F, this is 4 degrees above the normal high of 63F. The low since midnight is 53F, which is 9 degrees above the daily normal low of 44F. Today's Observations: 7 A.M. Weather: Broken altocumulus, broken cirrus Temperature: 57F; Dew Point: 43F; Relative Humidity: 59% Wind: N at 5 kts, wind light Sea-level pressure: 29.92 in Hg, rising, then more rapidly Visibility: 50 miles 6-hr Max temp: 57F 6-hr Min temp: 53F 24-hr Precip: 0.01 ins. 24-hr Snow: 0.0 ins. Snow Depth: 0.0 ins. BHO SA 1155 E85 BKN 250 BKN 50 132/57/43/3605/992/ WND LGT/ 8/052 53017 6000/ 70001 10057 20053 10 A.M. Weather: Broken altostratus, broken cirrostratus, broken cirrus Temperature: 63F; Dew Point: 34F; Relative Humidity: 33% Wind: E @ 7G16 kts Sea-level pressure: 29.91 in Hg; rising then falling Visibility: 60 miles 3-hr Precip: 0.0 ins. 3-hr Snow: 0.00 ins. BHO SA 1455 E100 BKN 220 BKN 250 BKN 60 128/63/34/0807G16/991/ 8/055 58004 1 P.M. Weather: Scattered altostratus castellanus, broken altocumulus, broken cirrostratus, thin overcast cirrus Temperature: 67F, Dew point: 37F; Relative Humidity: 32% Wind: NE @ 8G17 kts Sea-level pressure: 29.89 in Hg; steady then falling Visibility: 50 miles 6-hr Max temp: 67F 6-hr Min temp: 57F 6-hr Precip: 0.00 ins. 6-hr Snow: 0.0 ins. Snow Depth: 0 ins. BHO SA 1755 80 SCT E100 BKN 200 BKN 250 -OVC 50 123/67/37/0408G17/989/ 8/085 58005 10067 20057 SUMMARY FOR SUNDAY, MAY 2, 2021 TEMPERATURE (DEGREES F) MAX.......76     NORMAL.....62 MIN.......48     NORMAL.....44 MEAN......62     NORMAL.....53 DEPARTURE FROM 30-YEAR (1981-2010) NORMAL........ +9 TOTAL DEPARTURE FOR THE MONTH.................... +6 [+2.8 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL THRU JUN) TOTAL HEATING UNITS FOR YESTERDAY............... 3  DEPARTURE.......-9 TOTAL HEATING UNITS FOR THE MONTH...............18  DEPARTURE.......-7 TOTAL HEATING UNITS FOR THE SEASON............5359  DEPARTURE.....-701 TOTAL HEATING UNITS LAST SEASON TO DATE.......5537  DEPARTURE.....-178 COOLING DEGREE DAYS (SEASON JAN THRU DEC) TOTAL COOLING UNITS FOR YESTERDAY............... 0  DEPARTURE....... 0 TOTAL COOLING UNITS FOR THE MONTH............... 0  DEPARTURE....... 0 TOTAL COOLING UNITS FOR THE SEASON.............. 0  DEPARTURE.......-2 TOTAL COOLING UNITS LAST SEASON TO DATE......... 0  DEPARTURE....... 0 PEAK WIND GUST (MPH):                      420C/Official..............41 SW  @  1:47 A.M.                      AEROVANE (south tower).....41 SW  @  1:47 A.M.                      ASOS.......................42 SSW @  1:47 A.M.                      DAVIS #1...................42 SW  @  1:47 A.M.                      DAVIS #2 (south tower).....43 SW  @  1:47 A.M.                      RMY........................46     @  1:45 A.M.                      VECTOR.....................47     @  1:47 A.M.                      MERLIN.....................N/A FASTEST MILE: CONTACTING ANEMOMETER/OFFICIAL..................27 W   @  6:18 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................26 W   @ 12:42 P.M. MAXIMUM 2-MINUTE DAVIS #1 AVERAGE...............29 W   @ 12:42 P.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE...............27 SW  @  1:47 A.M. MAXIMUM 2-MINUTE RMY AVERAGE....................24 W   @  6:18 P.M. MAXIMUM 2-MINUTE VECTOR AVERAGE.................27     @ 12:40 P.M. AVERAGE WIND SPEED AND DIRECTION:                      CONTACTING/OFFICIAL......14.1 WSW [339 total miles]                      ASOS.....................13.8                      DAVIS #1.................14.3 WSW                      DAVIS #2.................14.4 WSW                      RMY......................13.4 WSW                      VECTOR...................14.0 PRECIPITATION (INCHES) THROUGH THIS MORNING (EST): TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.......0.01  DEPARTURE....-0.12                              ASOS.............0.00 TOTAL PRECIPITATION FOR THE MONTH.............0.07  DEPARTURE....-0.18                              ASOS.............0.05 TOTAL PRECIPITATION FOR THE YEAR.............15.12  DEPARTURE....-3.67                               ASOS...........15.33 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 04/01   56/30/43/+2/0.89/T/000/00        44 NW   AERO 51 NW   RMY 49 04/02   37/24/31/-10/0.00/0.0/614/80     28 NW   AERO 32 NNW  RMY 30 04/03   48/23/36/-6/0.00/0.0/755/98      24 NW   AERO 25 NW   RMY 26 04/04   58/33/46/+4/0.00/0.0/734/95      38 NNW  AERO 41 NNW  RMY 41 04/05   57/41/49/+6/T/T/031/04           41 NNW  AERO 48 NNW  RMY 50 04/06   61/40/51/+8/0.00/0.0/412/53      26 NNW  AERO 25 NNW  RMY 31 04/07   57/41/49/+6/0.00/0.0/391/50      23 ENE  AERO 21 ENE  RMY 22 04/08   59/43/51/+7/0.00/0.0/745/95      22 ENE  AERO 22 ENE  RMY 24 04/09   69/42/56/+12/0.00/0.0/707/90     24 S    AERO  M   M  RMY 26 04/10   75/43/59/+14/0.00/0.0/576/73     26 SSW  AERO 28 SSW  RMY 30 04/11   53/40/47/+2/T/0.0/000/00         33 ENE  AERO 33 ENE  RMY 34 04/12   46/37/42/-3/0.05/0.0/000/00      36 ENE  AERO 37 ENE  RMY 41 04/13   56/37/47/+1/T/0.0/415/52         31 NE   AERO 30 NE   RMY 33 04/14   56/42/49/+3/0.00/0.0/729/91      22 ESE  AERO 23 ESE  RMY 22 04/15   51/37/44/-3/0.30/0.0/016/02      26 ESE  AERO 25 ESE  RMY 28 04/16   39/31/35/-12/2.22/3.6/000/00     48 NNW  AERO 58 NNW  RMY 58 04/17   45/34/40/-7/0.07/T/040/05        27 NNW  AERO 30 NNW  RMY 29 04/18   60/38/49/+1/0.00/0.0/666/82      28 NW   AERO 28 NW   RMY 31 04/19   66/44/55/+7/T/0.0/.../..         22 SSW  AERO 25 SSW  RMY 28 04/20   72/45/59/+10/0.00/0.0/.../..     38 SW   AERO 37 WSW  RMY 40 04/21   68/32/50/+1/0.48/*T/.../..       45 S    AERO 51 S    RMY 51 TSTM 04/22   44/28/36/-13/T/T/.../..          54 W    AERO 55 W    RMY 59 04/23   58/32/45/-5/0.00/0.0/.../..      47 W    AERO 48 W    RMY 52 04/24   70/44/57/+7/0.00/0.0/.../..      33 WNW  AERO 37 WNW  RMY 55 04/25   54/44/49/-1/0.20/0.0/.../..      23 NNE  AERO 20 SSW  RMY 24 04/26   55/40/48/-3/0.00/0.0/.../..      39 NW   AERO 40 NW   RMY 43 04/27   67/38/53/+2/T/0.0/.../..         26 W    AERO 28 WNW  RMY 28 04/28   63/46/55/+3/0.18/0.0/.../..      18 ENE  AERO 21 WNW  RMY 20 04/29   54/44/48/-4/0.42/0.0/.../..      18 ENE  AERO 20 NNE  RMY 19 04/30   62/41/52/0/0.08/0.0/.../..       58 WNW  AERO 60 WNW  RMY 65 *Trace of frozen on 04/21 was hail, 1/8" diameter, this does not count as snowfall. 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   62/38/50/-3/0.06/0.0/.../..       31 WNW  AERO 35 WNW  RMY 40 05/02   76/48/62/+9/0.01/0.0/.../..       41 SW   AERO 41 SW   RMY 46 05/03 The low since midnight is 53F, the daily normal low is 44F   DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated) RECORDS FOR MAY 3 HIGH 92F IN 2001 LOW 31F IN 1888 PRECIP 2.25 INS IN 1900 SNOWFALL TRACE IN 1908, 1985 PEAK GUST 71 MPH W IN 2002 RECORDS FOR MAY 4 HIGH 90F IN 2001 LOW 27F IN 1911 (RECORD FOR MAY) PRECIP 1.67 INCHES IN 1893 SNOWFALL 0.1 INCHES IN 1920 PEAK GUST 60 MPH NW IN 1966 TODAY'S REPORT PREPARED BY: Matt Douglas