Saturday, July 11, 2020

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

SATURDAY, JULY 11, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

BREEZY AND PARTLY CLOUDY, YET STILL WARM
ATOP GREAT BLUE HILL….

Today has been partly cloudy, with visibility
being limited to 35 miles due to haze. From
the passing showers last night, we received
0.05 inches of rainfall. Wind was southerly,
at an average of 20 mph. The max gust is around
40 mph currently.

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, broken cirrus
Temperature: 73F; Dew Point: 70F; Relative Humidity: 89%
Wind: S at 16G26 kts, peak of 30 mph at 6:44 A.M.
Sea-level pressure: 29.78 ins. Hg: rising unsteadily
Visibility: 40 miles
6-hr Max temp: 73F
6-hr Min temp: 71F
24-hr Precip: 0.05 ins.
BHO SA 1155 50 SCT 250 BKN 40 083/73/70/1716G26/978/ PK WND
1726/44/ 8/801 52001 10073 20071

10 A.M.
Weather: Scattered cumulus and cirrus
Temperature: 81F; Dew Point: 72F; Relative Humidity: 75%
Wind: S at 19G30 kts, peak of 35 MPH S at 9:50 A.M.
Sea-level pressure: 29.77 ins. Hg: steady, then falling
Visibility: 35 miles, hazy
3-hr Precip:  0.00 ins.
BHO SA 1455 30 SCT 250 SCT 35 080/81/72/1919G30/977/ HAZY
PK WND 1930/50/ 8/102 58003

1 P.M.
Weather: Scattered cumulus, broken cirrus
Temperature: 85F; Dew Point: 71F; Relative Humidity: 64%
Wind: S at 18G30 kts, peak of 39 MPH S at 12:56 P.M.
Sea-level pressure: 29.75 ins. Hg: falling steadily
Visibility: 30 miles, hazy
6-hr Max temp: 85F
6-hr Min temp: 73F
6-hr Precip:  0.00 ins.
BHO SA 1755 40 SCT 250 BKN 30 074/85/71/1818G30/975/ HAZY PK
WND 1934/56/ 8/202 58006 10085 20073

SUMMARY FOR FRIDAY, JULY 10, 2020

TEMPERATURE (DEGREES F)
MAX…..83   NORMAL…..81
MIN…..70   NORMAL…..63
MEAN….77   NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL…………….. +5
TOTAL DEPARTURE FOR THE MONTH…………….. +10 [+0.8 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………..12  DEPARTURE……. +5
TOTAL COOLING UNITS FOR THE MONTH……………..71  DEPARTURE………7
TOTAL COOLING UNITS FOR THE SEASON………….. 255  DEPARTURE…….+62
TOTAL COOLING UNITS LAST SEASON TO DATE……….191  DEPARTURE…….+64

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..30 SSE AT 11:01 P.M.
AERO…………………….32 SSE AT 10:00 P.M.
ASOS…………………….29 SSE AT 11:01 P.M.
DAVIS……………………30 SSE AT 11:00 P.M RMY N/A
FASTEST MILE FOR YESTERDAY………………….20 SSE AT 11:02 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….20 SSE AT 11:17 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………22 SSE AT 11:01 P.M.
AVERAGE WIND SPEED AND DIRECTION………….. 9.6 ESE
ASOS………………….. 8.8
DAVIS…………………. 9.6 ESE [143 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.05  DEPARTURE……-0.08
ASOS…………..0.05
TOTAL PRECIPITATION FOR THE MONTH……….0.60  DEPARTURE……-0.52
ASOS…………..0.60
TOTAL PRECIPITATION FOR THE YEAR……….27.95  DEPARTURE……-0.14
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 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 11
HIGH 98F IN 1911
LOW 49F IN 1890
PRECIP 1.87 INS IN 1959
WIND 53 MPH NW IN 1988

RECORDS FOR JULY 12
HIGH 97F IN 1943
LOW 48F IN 1945
PRECIP 1.43 INS IN 1975
WIND 48e MPH SSW IN 1944

TODAY’S REPORT PREPARED BY: Benjamin Turner