BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA FRIDAY, JUNE 18, 2021 ALL TIMES ARE IN EASTERN STANDARD TIME SUNRISE: 0407E SUNSET:  1924E GORGEOUS WEATHER CONTINUES, SOME AFTERNOON CLOUDS.... Today began under clear skies and cool temperatures. A refreshing low of 56F was recorded. Visibility was 80 miles at 7AM slipping only to 75 miles by early afternoon. High-level clouds began rolling in around mid-morning, but have been scattered in nature. Low dew points have been the theme of the last few days. Today is no exception. We are seeing readings predominantly in the 40s! This has allowed large temperature swings between morning lows and afternoon highs. The high so far today is 80F, which is 4 above below the normal high of 76F. The low since midnight is 56F, which is 2 degrees below the daily normal low of 58F. PRELIMINARY STATS FOR MAY 2021 TEMPERATURE, Deg. F Avg. Max. 68.1 [+1.8] Avg. Min. 48.0 [+0.2] Mean      58.1 [+1.0] 24-hour corrected mean: 57.7 Max. for month: 87F on the 22nd, 23rd Min. for month: 38F on the 1st HEATING DEGREE DAYS Total heating units:    237 [-31] Total for the season:  5578 [-725] Total for last season: 5812 PRECIPITATION, Inches Total: 5.60 [+1.49] Greatest in 24 hrs: 2.50 ins. on the 28th-29th WIND, mph Avg. uncorrected wind speed: 10.9 mph Avg. corrected wind speed:   11.4 mph Prevailing wind direction:   WNW [16%] Peak gust and direction:     44 ENE on the 29th SUNSHINE: Campbell-Stokes card minutes: 14478 minutes of a possible 26226 or 55% Astronomical total minutes: 14977 minutes of a possible 27188 or 55% Today's Observations: 7 A.M. Weather: Clear (few cirrus W-N, thin smoke layer along horizon NW-NE) Temperature: 62F; Dew Point: 48F; Relative Humidity: 60% Wind: W @ 7 kts Sea-level pressure: 30.03 in. Hg; rising, then rising more slowly Visibility: 80 miles 6-hr Max temp: 62F 6-hr Min temp: 56F 24-hr Precip: 0.00 ins. BHO SA 1155 CLR 80 169/62/48/2607/003/ FEW CI DSNT W-N THN K LYR ALG HRZN NW-NE/ 8/001 51005 10062 20056 10 A.M. Weather: Scattered Cirrus Temperature: 75F; Dew Point: 48F; Relative Humidity: 38% Wind: SW @ 9 kts Sea-level pressure: 30.00 in Hg; Falling, then falling more rapidly Visibility: 75 miles 3-hr Precip: 0.00 ins. BHO SA 1455 SCT 250 75 156/75/48/2109/000/ 8/001 58013 1 P.M. Weather: Scattered Cirrus Temperature: 79F, Dew point: 46F; Relative Humidity: 31% Wind: SW @ 8G17 kts Sea-level pressure: 29.96 in Hg; Falling, then falling more rapidly Visibility: 75 miles 6-hr Max temp: 80F 6-hr Min temp: 62F 6-hr Precip: 0.00 ins. BHO SA 1755 SCT 250 75 143/79/46/238G17/996/ 8/001 58013 10080 20062 SUMMARY FOR THURSDAY, JUNE 17, 2021 TEMPERATURE (DEGREES F) MAX.......77     NORMAL.....76 MIN.......52     NORMAL.....58 MEAN......65     NORMAL.....67 DEPARTURE FROM 30-YEAR (1981-2010) NORMAL........-2 TOTAL DEPARTURE FOR THE MONTH...................+82 [+4.6 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL THRU JUN) TOTAL HEATING UNITS FOR YESTERDAY............... 0  DEPARTURE.......-2 TOTAL HEATING UNITS FOR THE MONTH...............16  DEPARTURE......-42 TOTAL HEATING UNITS FOR THE SEASON............5594  DEPARTURE.....-767 TOTAL HEATING UNITS LAST SEASON TO DATE.......5852  DEPARTURE.....-258 COOLING DEGREE DAYS (SEASON JAN THRU DEC) TOTAL COOLING UNITS FOR YESTERDAY................0  DEPARTURE.......-4 TOTAL COOLING UNITS FOR THE MONTH...............85  DEPARTURE......+41 TOTAL COOLING UNITS FOR THE SEASON.............114  DEPARTURE......+46 TOTAL COOLING UNITS LAST SEASON TO DATE.........77  DEPARTURE......+37 PEAK WIND GUST (MPH):                      420C/Official..............21 WNW @ 12:01 P.M.                      AEROVANE (south tower).....21 NW  @ 12:45 P.M                      ASOS.......................20 NW  @  1:12 P.M                      VECTOR.....................23     @ 12:02 P.M                      DAVIS #1...................20 WNW @ 12:01 P.M                      DAVIS #2 (south tower).....20 WNW @  9:41 A.M                      RMY........................23     @ 12:01 P.M                      MERLIN.....................22 FASTEST MILE: CONTACTING ANEMOMETER/OFFICIAL..................15*W   @  1:52 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................15 W   @  1:52 P.M. MAXIMUM 2-MINUTE VECTOR AVERAGE.................16     @ 12:02 P.M. MAXIMUM 2-MINUTE DAVIS #1 AVERAGE...............16 W   @  1:52 P.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE...............15 NW  @ 12:35 P.M. MAXIMUM 2-MINUTE RMY AVERAGE....................15 NNW @  1:52 P.M.                                                   *=estimated AVERAGE WIND SPEED AND DIRECTION:                      CONTACTING/OFFICIAL......7.5* WNW [181 total miles]                      ASOS.....................8.5                      VECTOR...................8.4                      DAVIS #1.................8.6 WNW                      DAVIS #2.................8.7 WNW                      RMY......................7.8 WNW                                                  *=estimated PRECIPITATION (INCHES) THROUGH THIS MORNING (EST): TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.......0.00  DEPARTURE....-0.14                              ASOS.............0.00 TOTAL PRECIPITATION FOR THE MONTH.............1.30  DEPARTURE....-1.42                              ASOS.............1.25 TOTAL PRECIPITATION FOR THE YEAR.............21.96  DEPARTURE....-3.42                               ASOS...........22.11 PRELIMINARY CLIMATE SUMMARY FOR JUNE CALENDAR DAY DATA DATE: MAX/MIN/MEAN/DEP/PRECIP/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 06/01   74/50/62/0/0.00/425/47            20 WSW  AERO 24 WSW  RMY 22 06/02   80/55/68/+6/0.00/553/61           28 S    AERO 25 S    RMY 28 06/03   73/56/65/+3/0.01/073/08           29 SSW  AERO 29 SSW  RMY 29 06/04   77/61/69/+6/0.02/054/06           23 SW   AERO 25 WSW  RMY 25 TSTM 06/05   87/60/74/+11/0.00/801/88          32 SSW  AERO 37 SSW  RMY 35 06/06   91/69/80/+17/0.00/819/90          30 WSW  AERO 31 WSW  RMY 32 06/07   92/69/81/+17/0.00/519/57          31 SSW  AERO 35 SSW  RMY 34 06/08   92/69/81/+17/0.06/.../..          24 WSW  AERO 25 WSW  RMY 27 TSTM 06/09   88/70/79/+15/0.02/.../..          21 N    AERO 23 NNW  RMY 23 06/10   70/53/62/-3/0.00/.../..           28 NE   AERO 28 NE   RMY 28 06/11   70/51/61/-4/0.13/.../..           21 SSE  AERO 22 SSE  RMY 22 06/12   72/53/63/-2/0.43/.../..           20 WSW  AERO 18 WSW  RMY 20 06/13   82/56/69/+4/0.00/.../..           26 SSW  AERO 29 SSW  RMY 29 06/14   65/56/61/-5/0.63/.../..           28 S    AERO 30 SSE  RMY 29 06/15   77/61/69/+3/T/.../..              18 NE   AERO 20 NE   RMY 18 TSTM 06/16   73/56/65/-1/0.00/.../..           27 NNW  AERO 31 NNW  RMY 27 06/17   77/52/65/-2/0.00/.../..           21 WNW  AERO 21 NW   RMY 23 06/18 The low since midnight is 56F, the daily normal low is 58F RECORDS FOR THE MONTH: High minimum on the 7th of 69F, beating the old record of 66F set in 1922 and 1953. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated) RECORDS FOR JUNE 18 HIGH 93F IN 1929, 1994 LOW 39F IN 1920 PRECIP 3.36 INS 1998 PEAK GUST 48e MPH W IN 1943 RECORDS FOR JUNE 19 HIGH 92F IN 1923 LOW 40F IN 1920 PRECIP 3.92 INS 1922 PEAK GUST 66e MPH NW IN 1940 TODAY'S REPORT PREPARED BY: Andrew Swanson