BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA SATURDAY, JUNE 12, 2021 ALL TIMES ARE IN EASTERN STANDARD TIME SUNRISE: 0407E SUNSET:  1922E A STEADY RAINFALL OVERNIGHT, GRADUAL CLEARING TODAY... An area of showers moved through the region overnight last night into this morning. Rainfall totaled 0.56", which was much needed as the month has been dry so far. The rain ended this morning, but clouds have been slow to break. Some sun has finally been seen late this morning into early this afternoon. The wind has been very light so far today, only averaging around 2 mph since 7 A.M., and no that's not a typo, only 2 mph!!! The peak gust so far today has been under 10 mph. Visibility has been decent today averaging about 60-65 miles. The high so far today is 69F, which is 5 degrees below the normal high of 74F. The low since midnight is 53F, which is 3 degrees below the daily normal low of 56F. 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: N/A 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: Sky partially obsured, overcast nimbostratus, light rain showers Temperature: 56F; Dew Point: 55F; Relative Humidity: 97% Wind: W @ 3kts, wind light Sea-level pressure: 29.91 in. Hg; falling, then rising Visibility: 1/8 mile, fog 6-hr Max temp: 57F 6-hr Min temp: 53F 24-hr Precip: 0.56 ins. BHO SA 1155 -X E80 OVC 1/8RW-F 127/56/55/2603/991/ PCPN VRY LGT WND LGT/ 8/62/ 55002 6043/ 70056 10057 20053 10 A.M. Weather: Broken stratus fractus, overcast stratocumulus Temperature: 59F; Dew Point: 57F; Relative Humidity: 93% Wind: NW @ 2kts, wind light Sea-level pressure: 29.91 in Hg; falling, then rising Visibility: 60 miles 3-hr Precip: Trace BHO SA 1455 E20 BKN 50 OVC 60 129/59/57/3102/991/ WND LGT/ 8/7// 53002 6000/ 1 P.M. Weather: Broken cumulus/stratocumulus, thin broken cirrus Temperature: 69F, Dew point: 56F; Relative Humidity: 64% Wind: NNW @ 2 kts, wind light and variable Sea-level pressure: 29.88 in Hg; falling, then more rapidly Visibility: 65 miles 6-hr Max temp: 69F 6-hr Min temp: 56F 6-hr Precip: Trace BHO SA 1755 E50 BKN 250 -BKN 65 120/69/56/3302/988/ WND L/V/ 8/201 58009 6000/ 10069 20056 SUMMARY FOR FRIDAY, JUNE 11, 2021 TEMPERATURE (DEGREES F) MAX.......70     NORMAL.....74 MIN.......53     NORMAL.....56 MEAN......61     NORMAL.....65 DEPARTURE FROM 30-YEAR (1981-2010) NORMAL........-4 TOTAL DEPARTURE FOR THE MONTH...................+85 [+7.5 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL THRU JUN) TOTAL HEATING UNITS FOR YESTERDAY............... 4  DEPARTURE.......+1 TOTAL HEATING UNITS FOR THE MONTH...............10  DEPARTURE......-33 TOTAL HEATING UNITS FOR THE SEASON............5588  DEPARTURE.....-758 TOTAL HEATING UNITS LAST SEASON TO DATE.......5836  DEPARTURE.....-248 COOLING DEGREE DAYS (SEASON JAN THRU DEC) TOTAL COOLING UNITS FOR YESTERDAY................0  DEPARTURE.......-3 TOTAL COOLING UNITS FOR THE MONTH...............77  DEPARTURE......+53 TOTAL COOLING UNITS FOR THE SEASON.............106  DEPARTURE......+58 TOTAL COOLING UNITS LAST SEASON TO DATE.........66  DEPARTURE......+40 PEAK WIND GUST (MPH):                      420C/Official..............21 SSE @  7:38 P.M.                      AEROVANE (south tower).....22 SSE @  7:42 P.M.                      ASOS.......................20 S   @  8:03 P.M.                      DAVIS #1...................23 S   @  7:37 P.M.                      DAVIS #2 (south tower).....27 SSE @  7:41 P.M.                      RMY........................22     @  7:36 P.M.                      VECTOR.....................23     @  7:37 P.M.                      MERLIN.....................20 FASTEST MILE: CONTACTING ANEMOMETER/OFFICIAL..................15 SSE @  7:44 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................14 SSE @  7:38 P.M. MAXIMUM 2-MINUTE DAVIS #1 AVERAGE...............15 S   @  7:33 P.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE...............18 SSE @  7:46 P.M. MAXIMUM 2-MINUTE RMY AVERAGE....................14 S   @  7:35 P.M. MAXIMUM 2-MINUTE VECTOR AVERAGE.................14     @  7:35 P.M. AVERAGE WIND SPEED AND DIRECTION:                      CONTACTING/OFFICIAL...... 7.8 SE [186 total miles]                      ASOS..................... 7.5                      DAVIS #1................. 8.1 SE                      DAVIS #2................. 8.7 SE                      RMY...................... 7.8 SSE                      VECTOR................... 8.2 PRECIPITATION (INCHES) THROUGH THIS MORNING (EST): TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.......0.56  DEPARTURE....+0.40                              ASOS.............0.54 TOTAL PRECIPITATION FOR THE MONTH.............0.67  DEPARTURE....-1.14                              ASOS.............0.62 TOTAL PRECIPITATION FOR THE YEAR.............21.33  DEPARTURE....-3.14                               ASOS...........21.48 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/+1/0.00/0.0/839/94       30 S    AERO 35 S    RMY 33 05/25   75/47/61/+1/0.00/0.0/761/85       31 SW   AERO 35 SW   RMY 34 05/26   86/57/72/+12/0.21/0.0/736/82      30 S    AERO 36 S    RMY 35 TSTM 05/27   79/57/68/+8/0.02/0.0/691/77       25 N    AERO 25 WNW  RMY 27 05/28   58/43/51/-10/1.00/0.0/162/18      28 ENE  AERO 32 ENE  RMY 27 05/29   46/42/44/-17/1.50/0.0/000/00      44 ENE  AERO 47 ENE  RMY 50 05/30   46/45/46/-15/0.87/0.0/000/00      37 NE   AERO 40 NE   RMY 40 05/31   57/46/52/-9/0.20/0.0/027/03       22 NNE  AERO 25 WNW  RMY 25 RECORDS FOR THE MONTH: Low maximum on the 30th of 46F, beating the old record of 51F set in 1996 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 The low since midnight is 53F, the daily normal low is 56F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated) RECORDS FOR JUNE 12 HIGH 94F IN 2017 LOW 40F IN 1906 PRECIP 1.79 INS 1955 PEAK GUST 58 MPH NW IN 1991 RECORDS FOR JUNE 13 HIGH 93F IN 1988 LOW 43F IN 1982 PRECIP 6.07 INS 1998 [Record for month] PEAK GUST 69 MPH N IN 1956 TODAY'S REPORT PREPARED BY: Matt Douglas