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

SUNDAY, JULY 12, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

INCOMING TROPICAL AIR BRINGS US MUCH 
BETTER VISIBILITY THAN DAYS PRIOR....

Today was partly cloudy with a decent 
visibility of 70 miles, seen due to a
new airmass entering the region. The 
air is dryer and seemingly cleaner than
that of days ago, with dew points finally
ducking back into the mid 60s. Wind is 
westerly, with a max gust so far of 29 mph. 
Average wind speed is around 15 mph. 

The high so far today is 85 degrees, this is 
4 degrees above the daily normal high of 81F. 
The low since midnight is 70F, which is 7 degrees 
above 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: N/A 

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 stratocumulus, scattered cirrus
Temperature: 74F; Dew Point: 69F; Relative Humidity: 84%
Wind: SSW at 14G19 kts
Sea-level pressure: 29.63 ins. Hg: steady
Visibility: 35 miles, hazy
6-hr Max temp: 73F
6-hr Min temp: 70F
24-hr Precip: 0.00 ins.
BHO SA 1155 250 SCT 35 035/74/69/2214G19/963/ FEW CU ALQDS 
HAZY/ 8/108 55000 10073 20070

10 A.M.
Weather: Broken cumulus
Temperature: 79F; Dew Point: 67F; Relative Humidity: 67%
Wind: W at 10G18 kts
Sea-level pressure: 29.66 ins. Hg: steady, then rising
Visibility: 65 miles
3-hr Precip:  0.00 ins.
BHO SA 1455 40 BKN 65 045/79/67/2610G18/966/ 8/200 52010

1 P.M.
Weather: Broken cumulus
Temperature: 85F; Dew Point: 66F; Relative Humidity: 54%
Wind: W at 10G20 kts,
Sea-level pressure: 29.65 ins. Hg: falling steadily
Visibility: 70 miles
6-hr Max temp: 85F
6-hr Min temp: 74F
6-hr Precip:  0.00 ins.
BHO SA 1755 40 BKN 70 043/85/66/2610G20/965/ 8/200 58002 
10085 20074  


SUMMARY FOR SATURDAY, JULY 11, 2020 

TEMPERATURE (DEGREES F)
MAX.....85   NORMAL.....81
MIN.....70   NORMAL.....63
MEAN....78   NORMAL.....72

DEPARTURE FROM 30-YEAR NORMAL................. +6
TOTAL DEPARTURE FOR THE MONTH................. +16 [+1.3 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY.................13  DEPARTURE....... +6
TOTAL COOLING UNITS FOR THE MONTH.................84  DEPARTURE........13
TOTAL COOLING UNITS FOR THE SEASON.............. 268  DEPARTURE.......+68
TOTAL COOLING UNITS LAST SEASON TO DATE..........200  DEPARTURE.......+68

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................39 S   AT 11:01 A.M.  
                   AERO.........................39 S   AT 11:53 A.M.  
                   ASOS.........................39 S   AT 11:56 A.M. 
                   DAVIS........................41 S   AT 10:24 A.M RMY N/A
FASTEST MILE FOR YESTERDAY......................30 S   AT 11:56 A.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...................29 S   AT 11:56 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................27 S   AT 10:25 A.M.
AVERAGE WIND SPEED AND DIRECTION..............18.1 S            
                   ASOS.......................18.2
                   DAVIS......................17.0 S [184 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.13
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........0.60  DEPARTURE......-0.65
                         ASOS..............0.60
TOTAL PRECIPITATION FOR THE YEAR..........27.95  DEPARTURE......-0.27
                         ASOS.............28.61


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/..../0.0/689/76         28 W    AERO 27 W   RMY 28
06/03  79/55/67/+5/T/0.0/400/44            29 W    AERO 28 W   RMY 26
06/04  87/62/75/+12/..../0.0/673/74        26 W    AERO 25 S   RMY N/A
06/05  80/65/73/+10/..../0.0/300/33        28 SSW  AERO 28 SSW RMY N/A TSTM
06/06  86/57/72/+9/..../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/T/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/-6/5/0/0.0/696/76          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/+3/0.00/0.0/761/83         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/..../0.0/064/07         18 NE   AERO 18 NE  RMY 18  TSTM
06/30  68/62/65/-5/..../.../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/.../.../..          16 E    AERO 14 E   RMY 14  TSTM
07/02  86/61/74/4/0.00/.../.../..          30 WSW  AERO 25 WSW RMY 33
07/03  73/60/67/-4/0.00/.../.../..         30 NE   AERO 28 NE  RMY 30
07/04  79/60/70/-1/0.00/.../..             16 S    AERO 16 S   RMY 16
07/05  83/63/73/+2/0.54/.../..             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 The low since midnight is 70F, 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 12
HIGH 97F IN 1943
LOW 48F IN 1945
PRECIP 1.43 INS IN 1975
WIND 48e MPH SSW IN 1944

RECORDS FOR JULY 13
HIGH 95F IN 1894
LOW 52F IN 1888, 1895, 1939, 1973
PRECIP 3.54 INS IN 1996
WIND 55 MPH SE IN 1996

TODAY'S REPORT PREPARED BY: Benjamin Turner