Thursday, July 9, 2020

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

THURSDAY, JULY 9, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

HAZY AND HOT WITH A LIGHT SOUTHWESTERLY
BREEZE….

Today was considerably hazy, with the
visibility barely reaching 35 miles by
the 1 P.M. observation. There is a light
yet consistent wind from the southwest,
with a max gust of only 13 mph for the
past 6 hours. Cloud cover has increased
since this morning, with taller cumulus
like the ones seen yesterday.

The high so far today is 88 degrees, this is
7 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: Broken stratocumulus and cirrostratus
Temperature: 75F; Dew Point: 70F; Relative Humidity: 85%
Wind: WSW at 8 kts
Sea-level pressure: 30.01 ins. Hg: rising steadily
Visibility: 15 miles, hazy
6-hr Max temp: 75F
6-hr Min temp: 70F
24-hr Precip: 0.00 ins.
BHO SA 1155 E30 BKN 250 BKN 15 162/75/70/2508/001/ HAZY/
8/408 53012 10075 20070

10 A.M.
Weather: Broken cumulus and cirrocumulus
Temperature: 82F; Dew Point: 72F; Relative Humidity: 72%
Wind: SSW at 5 kts, light
Sea-level pressure: 30.02 ins. Hg: falling then rising
Visibility: 20 miles, hazy
3-hr Precip:  0.00 ins.
BHO SA 1455 E30 BKN 250 BKN 20 166/82/72/2005/002/ HAZY WND
LGT/ 8/209 50004

1 P.M.
Weather: Broken cumulus and cirrus
Temperature: 87F; Dew Point: 72F; Relative Humidity: 61%
Wind: SSW at 7 kts
Sea-level pressure: 30.01 ins. Hg: rising then falling
Visibility: 35 miles, hazy
6-hr Max temp: 88F
6-hr Min temp: 75F
6-hr Precip:  0.00 ins.
BHO SA 1755 E30 BKN 250 BKN 35 163/87/72/2207/001/ HAZY/
8/206 55003 10088 20075

SUMMARY FOR WEDNESDAY, JULY 8, 2020

TEMPERATURE (DEGREES F)
MAX…..83   NORMAL…..80
MIN…..64   NORMAL…..63
MEAN….74   NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL…………….. +2
TOTAL DEPARTURE FOR THE MONTH…………….. -3 [-0.6 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY………………9  DEPARTURE……. +2
TOTAL COOLING UNITS FOR THE MONTH……………..44  DEPARTURE……..-7
TOTAL COOLING UNITS FOR THE SEASON………….. 228  DEPARTURE…….+48
TOTAL COOLING UNITS LAST SEASON TO DATE……….169  DEPARTURE…….+59

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..32 S   AT  3:44 P.M.
AERO…………………….32 S   AT  3:40 P.M.
ASOS…………………….32 SW  AT  3:45 P.M.
DAVIS……………………32 SW  AT  4:34 P.M RMY 32
FASTEST MILE FOR YESTERDAY………………….22 SSW AT  3:42 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….22 SSW AT  3:49 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………22 SSW AT  3:49 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..12.0 S
ASOS…………………..12.8
DAVIS………………….11.4 SSW [208 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.12
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.55  DEPARTURE……-0.33
ASOS…………..0.55
TOTAL PRECIPITATION FOR THE YEAR……….27.90  DEPARTURE……+0.05
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/-6/5/0/0.0/696/76          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 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 9
HIGH 98F IN 1912
LOW 47F IN 1909
PRECIP 3.74 INS IN 1921
WIND 46 MPH NW IN 1992

RECORDS FOR JULY 10
HIGH 99F IN 1911
LOW 46F IN 1890
PRECIP 1.95 INS IN 2015
WIND 75 MPH W IN 1985

TODAY’S REPORT PREPARED BY: Benjamin Turner