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

THURSDAY, JULY 16, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

ANOTHER COOL WEATHER DAY WITH A LIGHT 
SEA BREEZE....

Today started off almost clear, but a 
layer of translucent cirrostratus has
developed over most of the sky. Wind
is around 10 mph, blowing in from the 
northeast. The max gust seen as of yet
is 17 mph. Pressure is falling slowly, 
while visibility is 70 miles on average.

Today is on the cooler side, barely reaching 
72 degrees by 1 P.M. This is 9 degrees below 
the daily normal high of 81F. The low since 
midnight is 57F, which is 5 degrees below the 
daily normal low of 63F.


PRELIMINARY STATS FOR JUNE 2020

TEMPERATURE, Deg. F
Avg. Max. 78.0 [+3.0]
Avg. Min. 59.1 [+2.0]
Mean      68.6 [+2.5]
24-hour corrected mean: 67.5
Max. for month: 90F on the 20th
Min. for month: 42F on the 1st

HEATING DEGREE DAYS
Total heating units:     40 [-33]
Total for the season:  5852 [-402]
Total for last season: 6254

COOLING DEGREE DAYS
Total cooling units:    152  [+47]
Total for the season:   184  [+55]
Total for last season:  89

PRECIPITATION, Inches
Total: 7.56 [+3.25]
Greatest in 24 hrs: 4.71 inches on the 28th-29th

WIND, mph
Avg. uncorrected wind speed: 9.1 mph
Avg. corrected wind speed:   9.8 mph
Prevailing wind direction:   S [15%]
Peak gust and direction:     55 SW on the 6th

SUNSHINE:
Campbell-Stokes card minutes: 15996 minutes of a possible 26376 or 61%
Astronomical total minutes: 16650 minutes of a possible 27422 or 61%


Today's Observations:

7 A.M.
Weather: Scattered cirrostratus, few cumulus
Temperature: 64F; Dew Point: 58F; Relative Humidity: 80%
Wind: ENE at 7 kts
Sea-level pressure: 30.38 ins. Hg: rising steadily
Visibility: 70 miles 
6-hr Max temp: 64F
6-hr Min temp: 57F
24-hr Precip: 0.00 ins.
BHO SA 1155 250 SCT 70 289/64/58/0607/038/ FEW CU ALQDS/ 
8/105 53011 10064 20057

10 A.M.
Weather: Scattered cumulus, broken cirrus
Temperature: 70F; Dew Point: 55F; Relative Humidity: 59%
Wind: ENE at 7 kts
Sea-level pressure: 30.36 ins. Hg: falling steadily
Visibility: 65 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 40 SCT 250 BKN 65 283/70/55/0707/036/ 8/102 
56006

1 P.M.
Weather: Scattered cumulus, broken cirrus
Temperature: 71F; Dew Point: 58F; Relative Humidity: 63%
Wind: ENE at 8 kts
Sea-level pressure: 30.35 ins. Hg: falling, then more slowly
Visibility: 60 miles
6-hr Max temp: 72F
6-hr Min temp: 64F
6-hr Precip: 0.00 ins.
BHO SA 1755 40 SCT 250 BKN 60 281/71/58/0708/035/ 8/102 
58002 10072 20064  


SUMMARY FOR WEDNESDAY, JULY 15, 2020 

TEMPERATURE (DEGREES F)
MAX.....72   NORMAL.....81
MIN.....59   NORMAL.....63
MEAN....66   NORMAL.....72

DEPARTURE FROM 30-YEAR NORMAL................. -6
TOTAL DEPARTURE FOR THE MONTH................. +19 [+1.1 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY..................1  DEPARTURE....... -6
TOTAL COOLING UNITS FOR THE MONTH................115  DEPARTURE.......+15
TOTAL COOLING UNITS FOR THE SEASON...............299  DEPARTURE.......+70
TOTAL COOLING UNITS LAST SEASON TO DATE..........242  DEPARTURE.......+57

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................21 NE  AT  4:34 A.M.  
                   AERO.........................21 NE  AT  4:08 A.M.  
                   ASOS.........................21 NE  AT  4:14 A.M. 
                   DAVIS........................21 NE  AT  4:13 A.M RMY N/A
FASTEST MILE FOR YESTERDAY......................13 ENE AT 11:32 A.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...................15 ENE AT 11:31 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................15 ENE AT 11:31 A.M.
AVERAGE WIND SPEED AND DIRECTION.............. 7.8 E            
                   ASOS....................... 8.7
                   DAVIS...................... 8.4 NE [75 deg.]

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..........0.87  DEPARTURE......-0.93
                         ASOS..............0.86
TOTAL PRECIPITATION FOR THE YEAR..........28.22  DEPARTURE......-0.55
                         ASOS.............28.87


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  64/42/53/-9/T/0.0/724/80            28 WNW  AERO 29 WNW RMY 28
06/02  72/45/59/-3/0.01/0.0/689/76         28 W    AERO 27 W   RMY 28
06/03  79/55/67/+5/0.00/0.0/400/44         29 W    AERO 28 W   RMY 26
06/04  87/62/75/+12/0.00/0.0/673/74        26 W    AERO 25 S   RMY N/A
06/05  80/65/73/+10/0.14/0.0/300/33        28 SSW  AERO 28 SSW RMY N/A TSTM
06/06  86/57/72/+9/1.14/0.0/301/33         55 SW   AERO 59 SW  RMY 59  TSTM
06/07  68/54/61/-3/0.00/0.0/255/28         24 NW   AERO 24 NW  RMY N/A
06/08  77/51/64/0/0.00/0.0/866/95          25 W    AERO 24 W   RMY 25
06/09  77/60/69/+5/T/0.0/110/12            23 E    AERO 21 E   RMY N/A
06/10  70/58/64/-1/0.00/0.0/658/72         25 E    AERO 24 E   RMY N/A
06/11  71/64/68/+3/0.62/0.0/165/18         40 S    AERO 40 S   RMY 42
06/12  82/63/73/+8/0.00/0.0/705/77         26 W    AERO 25 W   RMY 27
06/13  71/53/62/-3/0.00/0.0/669/73         21 WNW  AERO 20 WNW RMY N/A            
06/14  67/49/58/-8/0.00/0.0/852/93         21 E    AERO 21 ENE RMY 21
06/15  67/53/60/-6/5/0.00/0.0/696/76       21 NE   AERO 16 ENE RMY 20
06/16  73/54/64/-2/0.00/0.0/889/97         18 E    AERO 18 E   RMY 18
06/17  78/57/68/+1/0.00/0.0/889/97         20 S    AERO 20 S   RMY 20
06/18  86/59/73/+6/0.00/0.0/715/78         22 S    AERO 22 SSW RMY 22
06/19  86/66/76/+9/0.00/0.0/789/86         22 S    AERO 22 S   RMY 21
06/20  90/65/78/+10/0.00/0.0/834/91        22 S    AERO 21 S   RMY 21
06/21  90/66/78/+10/0.83/0.0/514/56        33 ESE  AERO 35 ESE RMY 33  TSTM
06/22  77/65/71/+3/T/0.0/761/83            15 E    AERO 17 S   RMY 14
06/23  85/65/75/+7/0.00/0.0/431/47         27 S    AERO 24 S   RMY 26
06/24  84/66/75/+6/0.00/0.0/348/38         25 S    AERO 24 S   RMY 25
06/25  84/63/74/+5/0.00/0.0/806/88         29 W    AERO 29 W   RMY 29
06/26  83/65/74/+5/0.02/0.0/769/84         25 S    AERO 25 S   RMY 27
06/27  82/65/74/+5/0.05/0.0/330/36         21 S    AERO 20 S   RMY 20
06/28  84/62/73/+3/3.27/0.0/421/46         35 W    AERO 33 N   RMY 37  TSTM
06/29  71/61/66/-4/1.46/0.0/064/07         18 NE   AERO 18 NE  RMY 18  TSTM
06/30  68/62/65/-5/0.02/0.0/027/03         14 ENE  AERO 14 ENE RMY 13 

Record rainfall on the 28th of 3.27". Old record 2.09" in 1938

PRELIMINARY CLIMATE SUMMARY FOR JULY 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

07/01  76/63/70/0/0.00/228/25              16 E    AERO 14 E   RMY 14  TSTM
07/02  86/61/74/4/0.00/803/88              30 WSW  AERO 25 WSW RMY 33
07/03  73/60/67/-4/0.00/091/10             30 NE   AERO 28 NE  RMY 30
07/04  79/60/70/-1/0.00/565/62             16 S    AERO 16 S   RMY 16
07/05  83/63/73/+2/0.54/373/41             24 NW   AERO 30 NW  RMY 26  TSTM
07/06  73/60/67/-4/0.00/.../..             20 ENE  AERO 16 NNE RMY 18
07/07  78/60/69/-2/0.00/.../..             25 S    AERO 25 S   RMY 26
07/08  83/64/74/+2/0.00/.../..             32 SSW  AERO 32 SSW RMY 32
07/09  89/70/80/+8/0.00/.../.              24 S    AERO 23 S   RMY 22 
07/10  83/70/77/+5/0.05/.../..             30 SSE  AERO 32 SSE RMY N/A
07/11  85/70/78/+6/0.00/.../..             39 S    AERO 39 S   RMY 38
07/12  86/70/78/+6/0.00/.../..             28 WSW  AERO 28 WSW RMY 29
07/13  82/69/76/+4/0.23/.../..             30 SSE  AERO 31 SSE RMY 30  TSTM
07/14  78/63/71/-1/0.00/.../..             26 ENE  AERO 25 ENE RMY 26  
07/15  72/59/66/-6/0.00/.../..             21 NE   AERO 21 NE  RMY N/A

07/16 The low since midnight is 57F, the daily normal low is 63F

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):  

RECORDS FOR JULY 16
HIGH 94F IN 1968, 1980, 1983, 1999
LOW 50F IN 1889, 1903
PRECIP 0.97 INS IN 2014
WIND 48e MPH SW 1944

RECORDS FOR JULY 17
HIGH 96F IN 1999
LOW 47F IN 1892
PRECIP 1.39 INS IN 1989
WIND 46 MPH WNW IN 1971

TODAY'S REPORT PREPARED BY: Benjamin Turner