BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

SATURDAY, JUNE 13, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

A VERY NICE, FAIR WEATHER DAY ATOP
GREAT BLUE HILL...

Today we observed an average visibility of 
80 miles, with a maximum of 85 miles at the
1 P.M. observation. This was accompanied by
a light and cool northwesterly breeze, and 
a partly cloudy sky. Wind has reached only 
16 mph at most. 

The high so far today is 71 degrees, this is 3
degrees below the daily normal high of 74F. The 
low since midnight is 56F, which is the same as 
the daily normal low of 56F.


PRELIMINARY STATS FOR MAY 2020

TEMPERATURE, Deg. F
Avg. Max. 67.2 [+0.9]
Avg. Min. 45.8 [-2.0]
Mean      56.5 [-0.6]
24-hour corrected mean: 56.1
Max. for month: 84F on the 27th
Min. for month: 31F on the 10th

HEATING DEGREE DAYS
Total heating units:    291 [+21]
Total for the season:  5812 [-491]
Total for last season: 5432

COOLING DEGREE DAYS
Total cooling units:    32  [+10]
Total for the season:   32  [+8]
Total for last season:   8

PRECIPITATION, Inches
Total: 2.75 [-1.36]
Greatest in 24 hrs: 0.94 ins. on the 1st

SNOWFALL, Inches
Total: Trace
Greatest in 24 hrs: Trace on the 9th

WIND, mph
Avg. uncorrected wind speed: 12.3 mph
Avg. corrected wind speed:   12.7 mph
Prevailing wind direction:   W [16%]
Peak gust and direction:     52 W on the 9th

SUNSHINE:
Campbell-Stokes card minutes: 16248 minutes of possible 26226 or 62%
Astronomical total minutes: 16872 minutes of possible 27210 or 62%


Today's Observations:

7 A.M.
Weather: Scattered cumulus
Temperature: 61F; Dew Point: 45F; Relative Humidity: 55%
Wind: NW at 7 kts  
Sea-level pressure: 30.15 ins. Hg: rising, then steady
Visibility: 80 miles 
6-hr Max temp: 62F
6-hr Min temp: 56F
24-hr Precip:  0.00 ins
24-hr Snowfall: 0.0 ins.
BHO SA 1155 80 SCT 80 209/61/45/3307/015/ 8/100 51016 
10062 20056

10 A.M.
Weather: Scattered cumulus
Temperature: 67F; Dew Point: 47F; Relative Humidity: 48%
Wind: NW at 5 kts, wind light
Sea-level pressure: 30.16 ins. Hg: steady, then rising
Visibility: 80 miles
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 80 SCT 80 214/67/47/3305/016/ WND LGT/ 8/100 
50005

1 P.M.
Weather: Broken cumulus and cirrostratus, with some 
lower stratocumulus to the SE
Temperature: 69F; Dew Point: 47F; Relative Humidity: 45%
Wind: NW at 3 kts, light and variable
Sea-level pressure: 30.16 ins. Hg: steady
Visibility: 85 miles
6-hr Max temp: 71F
6-hr Min temp: 60F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
BHO SA 1755 E50 BKN 250 BKN 85 214/69/47/3303/016/ FEW LWR SC 
SE WND L/V/ 8/808 58000 10071 20060


SUMMARY FOR FRIDAY, JUNE 12, 2020 

TEMPERATURE (DEGREES F)
MAX.....82   NORMAL.....74
MIN.....63   NORMAL.....56
MEAN....73   NORMAL.....65

DEPARTURE FROM 30-YEAR NORMAL..................+8
TOTAL DEPARTURE FOR THE MONTH.................+36 [+2.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY................0  DEPARTURE........-3
TOTAL HEATING UNITS FOR THE MONTH...............24  DEPARTURE.......-22
TOTAL HEATING UNITS FOR THE SEASON............5836  DEPARTURE......-513
TOTAL HEATING UNITS LAST SEASON TO DATE.......6235  DEPARTURE......-399

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY............... 8  DEPARTURE....... +5
TOTAL COOLING UNITS FOR THE MONTH...............42  DEPARTURE.......+15
TOTAL COOLING UNITS FOR THE SEASON..............74  DEPARTURE.......+23
TOTAL COOLING UNITS LAST SEASON TO DATE.........29  DEPARTURE.......+45

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................26 W   AT 12:59 P.M.  
                   AERO.........................25 W   AT  1:37 P.M.  
                   ASOS.........................26 SW  AT  1:20 P.M. 
                   DAVIS........................26 WNW AT 12:31 P.M. RMY 27
FASTEST MILE FOR YESTERDAY......................21 W   AT  2:40 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...................20 W   AT  2:40 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................21 W   AT  2:39 P.M.
AVERAGE WIND SPEED AND DIRECTION...............9.0 W               
                   ASOS........................8.8
                   DAVIS.......................9.3 W [274 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.16
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........1.91  DEPARTURE......-0.06
                         ASOS..............1.91
TOTAL PRECIPITATION FOR THE YEAR..........21.70  DEPARTURE......-2.93
                         ASOS.............22.22


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  64/52/58/+5/0.94/0.0/000/00         46 SSE  AERO 44 SSE RMY N/A
05/02  70/42/56/+3/T/0.0/729/86            41 NW   AERO 40 NW  RMY N/A
05/03  78/55/67/+14/0.00/0.0/613/72        35 SSW  AERO 35 SSW RMY 36
05/04  72/45/59/+5/T/0.0/247/29            37 NW   AERO 40 WNW RMY 39  
05/05  60/40/50/-4/0.00/0.0/821/96         31 NW   AERO 32 NW  RMY N/A
05/06  57/38/48/-6/T/0.0/498/58            24 ESE  AERO 22 ENE RMY 22
05/07  63/37/50/-5/0.00/0.0/576/67         30 WSW  AERO 29 WSW RMY N/A
05/08  57/40/49/-6/0.33/0.0/328/38         31 W    AERO 32 W   RMY N/A
05/09  44/32/38/-17/0.12/T/484/56          52 W    AERO 53 W   RMY 54
05/10  59/31/45/-10/0.00/0.0/763/88        46 W    AERO 46 W   RMY 49
05/11  65/43/54/-2/0.22/0.0/322/37         39 S    AERO 43 S   RMY 41
05/12  55/37/46/-10/0.00/0.0/801/92        37 W    AERO 37 W   RMY 37
05/13  59/32/46/-10/0.00/0.0/864/99        37 WNW  AERO 37 WNW RMY 38
05/14  70/40/55/-2/T/0.0/831/95            29 W    AERO 26 W   RMY 27
05/15  78/50/64/+7/0.82/0.0/535/61         40 WSW  AERO 40 WSW RMY 43 TSTM
05/16  69/47/58/+1/0.12/0.0/730/83         31 NW   AERO 31 NW  RMY 32
05/17  67/47/57/0/0.00/0.0/132/15          22 SSW  AERO N/A    RMY 21
05/18  60/47/54/-4/T/0.0/053/06            24 W    AERO 22 ENE RMY N/A
05/19  56/45/51/-7/0.00/0.0/797/90         35 ENE  AERO 34 ENE RMY 32
05/20  63/43/53/-5/0.00/0.0/869/98         22 ESE  AERO 20 SE  RMY 19
05/21  76/42/59/0/0.00/0.0/862/97          26 S    AERO 25 S   RMY 25
05/22  82/50/66/+7/0.00/0.0/864/97         29 W    AERO 29 W   RMY 28
05/23  67/44/56/-3/0.02/0.0/187/21         42 ENE  AERO 43 ENE RMY 40
05/24  58/43/51/-8/T/0.0/822/92            27 ENE  AERO 24 ENE RMY N/A
05/25  66/46/56/-4/0.02/0.0/072/08         18 ENE  AERO 18 ENE RMY N/A
05/26  82/56/69/+9/0.00/0.0/727/81         21 S    AERO 21 S   RMY 21
05/27  84/59/72/+12/0.00/0.0/728/81        31 SSW  AERO 31 SSW RMY 31  
05/28  77/63/70/+9/0.02/0.0/027/03         33 SSW  AERO 33 S   RMY 33
05/29  78/66/72/+11/0.02/0.0/072/08        41 SSW  AERO 41 SSW RMY 43
05/30  79/63/71/+10/0.12/0.0/713/79        30 S    AERO 30 S   RMY N/A
05/31  67/45/56/-5/0.00/0.0/805/89         33 WNW  AERO 33 WNW RMY 32

DAILY RECORDS FOR MAY 2020

5/13/2020: NEW RECORD LOW OF 32F, REPLACING 35F SET IN
1914 AND 2005


PRELIMINARY CLIMATE SUMMARY FOR JUNE 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

06/01  64/42/53/-9/T/0.0/.../..            28 WNW  AERO 29 WNW RMY 28
06/02  72/45/59/-3/..../0.0/.../..         28 W    AERO 27 W   RMY 28
06/03  79/55/67/+5/T/0.0/.../..            29 W    AERO 28 W   RMY 26
06/04  87/62/75/+12/..../0.0/.../..        26 W    AERO 25 S   RMY N/A
06/05  80/65/73/+10/..../0.0/.../..        28 SSW  AERO 28 SSW RMY N/A TSTM
06/06  86/57/72/+9/..../0.0/.../..         55 SW   AERO 59 SW  RMY 59  TSTM
06/07  68/54/61/-3/0.00/0.0/.../..         24 NW   AERO 24 NW  RMY N/A
06/08  77/51/64/0/0.00/0.0/.../..          25 W    AERO 24 W   RMY 25
06/09  77/60/69/+5/T/.../..                23 E    AERO 21 E   RMY N/A
06/10  70/58/64/-1/T/0.0/.../..            25 E    AERO 24 E   RMY N/A
06/11  71/64/68/+3/0.62/0.0/.../..         40 S    AERO 40 S   RMY 42
06/12  82/63/73/+8/0.00/.../..             26 W    AERO 25 W   RMY 27

06/13 The low since midnight is 56F, 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 13
HIGH 93F IN 1988
LOW 43F IN 1982
PRECIP 6.07 INS 1998 [Record for month]
PEAK GUST 69 MPH N IN 1956

RECORDS FOR JUNE 14
HIGH 93F IN 1956
LOW 41F IN 1912
PRECIP 1.49 INS 1896
PEAK GUST 55 MPH WNW IN 1958

TODAY'S REPORT PREPARED BY: Benjamin Turner