BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA SUNDAY MAY 30, 2021 ALL TIMES ARE IN EASTERN STANDARD TIME SUNRISE: 0411E SUNSET:  1910E RAINY AND RAW WITH SOME REALLY CHILLY TEMPERATURES.... Today had almost no temperature variation, with temps between 45F and 46F. Overnight rain totaled 0.33 inches, with an additional 0.22 inches between 7 A.M. and 1 P.M. Visibility is very low due to fog, being a 1/2 mile on average. It is quite windy at the summit, with a max gust of 38 mph occurring this morning. The average wind speed is 15 mph from the northeast with frequent gusts above 25 mph! Yesterday's max temperature of 46F was the 3rd coldest On record for the date, and it was the first below 50F on May 29th in over a hundred years. This was also the coldest maximum temperature this late in the season since 46F was observed as the high temperature on June 2nd, 1946. BHO Coldest May 29 Daily Maximum Temperature, deg F (1885-2021): 1) 45 in 1887    45 in 1917 3) 46 in 2021!!! 4) 51 in 2017    51 in 2019 6) 52 in 1946 7) 53 in 1891 Credit: BHO Chief Scientist Michael Iacono The high so far today is 46F, which is 24 degrees below the normal high of 70F. The low since midnight is 45F, which is 6 degrees below the daily normal low of 51F. Today's Observations: 7 A.M. Weather: Overcast stratus, light rain Temperature: 46F; Dew Point: 46F; Relative Humidity: 100% Wind: NE @ 19G22 kts, peak of 35 mph NE at 6:23 A.M. Sea-level pressure: 30.25 in. Hg; falling, then rising Visibility: 4 miles, fog 6-hr Max temp: 46F 6-hr Min temp: 45F 24-hr Precip: 0.33 ins. BHO SA 1155 15 OVC 4R-F 245/46/46/0614G22/025/ L-BCMG R-5 PK WND 0631/23/ 8/6// 70033 50009 10046 20045 10 A.M. Weather: Light rain Temperature: 46F; Dew Point: 46F; Relative Humidity: 100% Wind: NE @ 15G29 kts, peak of 38 mph NE at 9:25 A.M. Sea-level pressure: 30.26 in Hg; falling then rising Visibility: 1/2 mile, fog 3-hr Precip: 0.05 ins. BHO SA 1455 X W3 1/2R-F 247/46/46/0615G29/026/ PK WND 0633/25/ 8//// 6005/ 50002 1 P.M. Weather: Light rain Temperature: 45F, Dew point: 45F; Relative Humidity: 100% Wind: NE @ 11G25 kts, peak of 38 mph NE at 12:18 P.M. Sea-level pressure: 30.25 in Hg; falling steadily Visibility: 1/16 miles, fog 6-hr Max temp: 46F 6-hr Min temp: 45F 6-hr Precip: 0.22 ins. BHO SA 1755 X W3 1/16R-F 244/45/45/0611G25/025/ PK WND 0633/18/ 8//// 58003 6022/ 10046 20045 SUMMARY FOR SATURDAY, MAY 29, 2021 TEMPERATURE (DEGREES F) MAX.......46     NORMAL.....70 MIN.......42     NORMAL.....52 MEAN......44     NORMAL.....61 DEPARTURE FROM 30-YEAR (1981-2010) NORMAL.......-17 TOTAL DEPARTURE FOR THE MONTH...................+60 [+1.9 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL THRU JUN) TOTAL HEATING UNITS FOR YESTERDAY...............21  DEPARTURE......+15 TOTAL HEATING UNITS FOR THE MONTH..............205  DEPARTURE......-53 TOTAL HEATING UNITS FOR THE SEASON............5546  DEPARTURE.....-746 TOTAL HEATING UNITS LAST SEASON TO DATE.......5803  DEPARTURE.....-257 COOLING DEGREE DAYS (SEASON JAN THRU DEC) TOTAL COOLING UNITS FOR YESTERDAY............... 0  DEPARTURE.......-1 TOTAL COOLING UNITS FOR THE MONTH...............29  DEPARTURE......+10 TOTAL COOLING UNITS FOR THE SEASON..............29  DEPARTURE.......+8 TOTAL COOLING UNITS LAST SEASON TO DATE.........26  DEPARTURE.......+3 PEAK WIND GUST (MPH):                      420C/Official..............44 ENE @  5:02 A.M.                      AEROVANE (south tower).....47 ENE @  5:02 A.M.                      ASOS.......................42 ENE @  5:02 A.M.                      DAVIS #1...................47 ENE @  5:01 A.M.                      DAVIS #2 (south tower).....46 ENE @  5:01 A.M.                      RMY........................50     @  5:01 A.M.                      VECTOR.....................48     @  5:01 A.M.                      MERLIN.....................N/A FASTEST MILE: CONTACTING ANEMOMETER/OFFICIAL..................30 ENE @  2:06 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................30 ENE @  2:06 A.M. MAXIMUM 2-MINUTE DAVIS #1 AVERAGE...............31 E   @  2:06 A.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE...............30 ENE @  6:45 A.M. MAXIMUM 2-MINUTE RMY AVERAGE....................28 ENE @  2:03 A.M. MAXIMUM 2-MINUTE VECTOR AVERAGE.................28     @  2:02 A.M. AVERAGE WIND SPEED AND DIRECTION:                      CONTACTING/OFFICIAL.......18.3 NE [439 total miles]                      ASOS......................17.8                      DAVIS #1..................18.3 ENE                      DAVIS #2..................18.3 ENE                      RMY.......................16.7 E                      VECTOR....................17.3 PRECIPITATION (INCHES) THROUGH THIS MORNING (EST): TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.......0.33  DEPARTURE....+0.19                              ASOS.............0.36 TOTAL PRECIPITATION FOR THE MONTH.............4.55  DEPARTURE....+0.75                              ASOS.............4.50 TOTAL PRECIPITATION FOR THE YEAR.............19.61  DEPARTURE....-2.74                               ASOS...........19.78 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/-3/0.06/0.0/659/78       31 WNW  AERO 35 WNW  RMY 40 05/02   76/48/62/+9/0.01/0.0/220/26       41 SW   AERO 41 SW   RMY 46 05/03   67/48/58/+5/0.07/0.0/400/47       21 E    AERO 20 E    RMY 20 05/04   50/44/47/-7/0.78/0.0/000/00       36 NNE  AERO 32 NNE  RMY 37 05/05   48/44/46/-8/0.47/0.0/000/00       18 ESE  AERO 14 ESE  RMY 17 05/06   64/45/55/+1/0.00/0.0/780/91       33 NW   AERO 38 NNW  RMY 39 05/07   61/43/52/-3/0.00/0.0/516/60       28 ESE  AERO 22 ESE  RMY 26 05/08   54/40/47/-8/0.00/0.0/069/08       24 SSW  AERO 23 SSW  RMY 25 05/09   66/42/54/-1/T/0.0/579/67          30 SW   AERO 29 SW   RMY 34 05/10   60/45/53/-2/0.39/0.0/078/09       21 W    AERO 20 W    RMY 20 05/11   63/45/54/-2/0.00/0.0/764/88       38 WNW  AERO 41 WNW  RMY 41 05/12   65/41/53/-3/0.00/0.0/722/83       28 NW   AERO M  M    RMY 31 05/13   69/45/57/+1/0.00/0.0/759/87       22 WNW  AERO 21 WNW  RMY 21 05/14   76/49/63/+8/0.00/0.0/725/83       23 WNW  AERO 23 WNW  RMY 25 05/15   75/55/65/+8/0.01/0.0/569/65       24 SSE  AERO 26 SSE  RMY 26 05/16   78/54/66/+9/0.01/0.0/483/55       36 W    AERO 37 W    RMY 42 05/17   77/52/65/+8/0.00/0.0/722/82       20 SSW  AERO 21 SSW  RMY 21 05/18   81/54/68/+10/T/0.0/600/68         32 W    AERO 30 W    RMY 32 05/19   75/55/65/+7/0.00/0.0/778/88       25 NE   AERO 23 NNE  RMY 27 05/20   75/52/64/+6/0.00/0.0/842/95       18 ESE  AERO 18 ESE  RMY 19 05/21   78/50/64/+5/T/0.0/524/59          23 S    AERO 22 S    RMY 26 05/22   87/56/72/+13/T/0.0/285/32         25 WNW  AERO 21 WNW  RMY 24 05/23   87/58/73/+14/T/0.0/687/77         38 NNW  AERO 37 NNW  RMY 40 05/24   70/49/60/+1/0.00/0.0/.../..       30 S    AERO 35 S    RMY 33 05/25   75/47/61/+1/0.00/0.0/.../..       31 SW   AERO 35 SW   RMY 34 05/26   86/57/72/+12/..../0.0/.../..      30 S    AERO 36 S    RMY 35 TSTM 05/27   79/57/68/+8/.../0.0/.../..        25 N    AERO 25 WNW  RMY 27 05/28   58/43/51/-10/..../0.0/.../..      28 ENE  AERO 32 ENE  RMY 27 05/29   46/42/44/-17/..../0.0/.../..      44 ENE  AERO 47 ENE  RMY 50 05/30   The low since midnight is 42F, the daily normal low is 52F   DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated) RECORDS FOR MAY 30 HIGH 93F IN 1929 LOW 39F IN 1949,1961 PRECIP 1.28 INS 1948 PEAK GUST 61e MPH NW IN 1945 RECORDS FOR MAY 31 HIGH 92F IN 1944,1987,2013 LOW 35F IN 1961 PRECIP 5.02 INS 1984 (RECORD FOR MAY) PEAK GUST 54e MPH WNW IN 1945 TODAY'S REPORT PREPARED BY: Benjamin Turner