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

TUESDAY, JULY 14, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

A BIT LESS WARM TODAY, BUT STILL HUMID...

A thunderstorm developed over the Boston area
this morning and moved offshore, however the
outflow from this storm helped to develop and
maintain a sea-breeze today which has helped to
keep temperatures a bit cooler. 

Despite the cooler temperatures, dew points have
remained in the mid to upper 60s, thus keeping
the humid feel in the air.

So far we haven't had a thunderstorm here at 
Blue Hill, but we have observed quite a few of
them all around us through the day. This has 
afforded us some pretty neat cloud observing,
including a couple of cumulonimbus with anvils!

The high so far today is 78 degrees, this is 
3 degrees below the daily normal high of 81F. 
The low since midnight is 66F, which is 3 
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: 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: Broken Stratocumulus, broken Altocumulus/Altocumulus Castellanus,
cumulonimbus distant NNW-N
Temperature: 71F; Dew Point: 68F; Relative Humidity: 91%
Wind: N at 7 kts
Sea-level pressure: 29.88 ins. Hg: rising unsteadily
Visibility: 25 miles, thin fog
6-hr Max temp: 71F
6-hr Min temp: 66F
24-hr Precip: 0.23 ins.
BHO SA 1155 E40 BKN 100 BKN 25 120/71/68/3607/988/ CB DSNT NNW-N
THN F ALQDS/ 8/380 52014 70023 10071 20066

10 A.M.
Weather: Broken cumulus, broken altocumulus castellanus, 
cumulonimbus in the vicinity N, cumulonimbus distant W-NW
Temperature: 76F; Dew Point: 67F; Relative Humidity: 74%
Wind: N at 7 kts
Sea-level pressure: 29.92 ins. Hg: rising, then more slowly
Visibility: 60 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 E30 BKN 50 BKN 60 133/76/67/3607/992/ TRW N-NNE MVG E
CB VCTY N CB DSNT W-NW/ 8/980 51013

1 P.M.
Weather: Broken cumulus, broken altocumulus/altocumulus castellanus,
broken dense cirrus, cumulonimbus distant SSW-SW and distant W-NW
Temperature: 78F; Dew Point: 65F; Relative Humidity: 65%
Wind: NE at 6 kts, wind direction N variable E 
Sea-level pressure: 29.95 ins. Hg: rising, then more slowly
Visibility: 50 miles
6-hr Max temp: 78F
6-hr Min temp: 71F
6-hr Precip: 0.00 ins.
BHO SA 1755 E30 BKN 110 BKN 200 BKN 50 143/78/65/0406/995/
CB DSNT SSW-SW AND DSNT W-NW WND 36V08/ 8/983 51010 10078 20071  


SUMMARY FOR MONDAY, JULY 13, 2020 

TEMPERATURE (DEGREES F)
MAX.....82   NORMAL.....81
MIN.....69   NORMAL.....63
MEAN....76   NORMAL.....72

DEPARTURE FROM 30-YEAR NORMAL................. +4
TOTAL DEPARTURE FOR THE MONTH................. +26 [+1.8 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY.................11  DEPARTURE....... +4
TOTAL COOLING UNITS FOR THE MONTH................108  DEPARTURE.......+23
TOTAL COOLING UNITS FOR THE SEASON...............292  DEPARTURE.......+78
TOTAL COOLING UNITS LAST SEASON TO DATE..........221  DEPARTURE.......+71

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................30 SSE AT 12:21 P.M.  
                   AERO.........................31 SSE AT 12:23 P.M.  
                   ASOS.........................28 SSE AT 12:20 P.M. 
                   DAVIS........................31 SSE AT 12:20 P.M RMY 30
FASTEST MILE FOR YESTERDAY......................23 SSE AT 12:21 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...................21 SSE AT 12:21 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................23 SSE AT 12:20 P.M.
AVERAGE WIND SPEED AND DIRECTION.............. 8.3 WSW            
                   ASOS....................... 8.8
                   DAVIS...................... 8.3 SW [218 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.23  DEPARTURE......+0.09
                         ASOS..............0.22
TOTAL PRECIPITATION FOR THE MONTH..........0.83  DEPARTURE......-0.70
                         ASOS..............0.82
TOTAL PRECIPITATION FOR THE YEAR..........28.18  DEPARTURE......-0.32
                         ASOS.............28.83


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  76/63/70/0/0.00/228/25              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 The low since midnight is 66F, 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 14
HIGH 98F IN 1952
LOW 51F IN 1895, 1937
PRECIP 1.97 INS IN 1960
WIND 110e MPH NW IN 1942 [THUNDERSTORM GUST; RECORD FOR MONTH]

RECORDS FOR JULY 15
HIGH 94F IN 1995
LOW 50F IN 1929, 1930
PRECIP 1.64 INS IN 1896
WIND 71 MPH WNW IN 2002

TODAY'S REPORT PREPARED BY: Matt Douglas