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

MONDAY, JULY 6, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

CLOUDS GAVE WAY TO SUNSHINE; ONSHORE FLOW KEEPING
TEMPS COOLER TODAY...

A couple of supercell thunderstorms passed the 
observatory last night just to the west. While it
was close enough to bring a brief period of heavy
rain, we didn't get any significant wind or hail.
0.54" of rain was measured from the storms.

Today started with overcast skies and fog. The
clouds gradually lifted through the morning giving
way to plenty of sunshine by early this afternoon.

An onshore flow however is preventing temperatures
from rising too much, with highs so far only in the
mid 70s.

The high so far today is 73 degrees, this is 7 
degrees below the daily normal high of 80F. The low
since midnight is 63F, which is a degree above the
daily normal low of 62F.

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: 16006 minutes of a possible 26376 or 61%
Astronomical total minutes: 16659 minutes of a possible 27422 or 61%


Today's Observations:

7 A.M.
Weather: Overcast stratus fractus
Temperature: 65F; Dew Point: 64F; Relative Humidity: 97%
Wind: N at 8 kts
Sea-level pressure: 30.06 ins. Hg: rising, then more slowly
Visibility: 3 miles, fog
6-hr Max temp: 65F
6-hr Min temp: 63F
24-hr Precip: 0.54 ins.
BHO SA 1155 E1 OVC 3F 178/65/64/3508/006/ STFRA OCCLY DRFTG OVR
SMT VSBY N-NE 1/ 8/6// 51019 70054 10065 20063

10 A.M.
Weather: Broken stratus fractus, overcast stratus, few breaks
in overcast west 
Temperature: 68F; Dew Point: 64F; Relative Humidity: 87%
Wind: NE at 5 kts, wind light  
Sea-level pressure: 30.11 ins. Hg: rising, then more slowly
Visibility: 25 miles, hazy
3-hr Precip:  0.00 ins.
BHO SA 1455 E15 BKN 25 OVC 25 195/68/64/0505/011/ FEW BINOVC W
HAZY WND LGT/ 8/6// 51017

1 P.M.
Weather: Broken stratocumulus
Temperature: 71F; Dew Point: 63F; Relative Humidity: 76%
Wind: ENE at 8G14 kts
Sea-level pressure: 30.13 ins. Hg: rising, then more slowly
Visibility: 30 miles, hazy
6-hr Max temp: 73F
6-hr Min temp: 64F
6-hr Precip:  0.00 ins.
BHO SA 1755 E15 BKN 30 204/71/63/0708G14/013/ HAZY/ 8/500 51009
10073 20064


SUMMARY FOR SUNDAY, JULY 5, 2020 

TEMPERATURE (DEGREES F)
MAX.....83   NORMAL.....80
MIN.....63   NORMAL.....62
MEAN....73   NORMAL.....71

DEPARTURE FROM 30-YEAR NORMAL................. +2
TOTAL DEPARTURE FOR THE MONTH.................  1 [+/- 0.0 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY..................8  DEPARTURE....... +1
TOTAL COOLING UNITS FOR THE MONTH.................29  DEPARTURE........-2
TOTAL COOLING UNITS FOR THE SEASON.............. 213  DEPARTURE.......+53
TOTAL COOLING UNITS LAST SEASON TO DATE..........143  DEPARTURE.......+70

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................24 NW  AT  9:57 P.M.  
                   AERO.........................30 NW  AT  9:57 P.M.  
                   ASOS.........................20 S   AT  8:51 P.M. 
                   DAVIS........................25 NW  AT  9:59 P.M RMY 26
FASTEST MILE FOR YESTERDAY......................17 NW  AT 10:01 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...................15 S   AT  9:09 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................17 NW  AT 10:00 P.M.
AVERAGE WIND SPEED AND DIRECTION...............6.7 S             
                   ASOS........................6.9
                   DAVIS.......................6.9 SSW [199 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.54  DEPARTURE......+0.43
                         ASOS..............0.54
TOTAL PRECIPITATION FOR THE MONTH..........0.55  DEPARTURE......+0.01
                         ASOS..............0.55
TOTAL PRECIPITATION FOR THE YEAR..........27.90  DEPARTURE......+0.39
                         ASOS.............28.56


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/-6/5/0/0.0/705/77          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 The low since midnight is 63F, the daily normal low is 62F


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

RECORDS FOR JULY 6
HIGH 99F IN 2010
LOW 47F IN 1979
PRECIP 1.43 INS IN 2005
PEAK GUST 56e MPH NNW IN 1942, 56 MPH WNW IN 1999

RECORDS FOR JULY 7
HIGH 97F IN 1908,1993
LOW 48F IN 1902
PRECIP 2.11 INS IN 1966
PEAK GUST 55 MPH NW IN 1989

TODAY'S REPORT PREPARED BY: Matt Douglas