Thursday, July 5, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, JULY 5, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

ANOTHER VERY HOT, HUMID DAY

The long stretch of unseasonably hot weather has continued today. After a
warm morning low of 73F, the temperature had hit a high of 91F by the 2PM EDT
observation. Oppressively high dew points in excess of 70F have compounded
the heat. Hazy conditions have been present, with the visibility limited to
just 10 miles due to haze early this morning before climbing somewhat to 25
miles by afternoon. Mostly sunny skies have become partly cloudy with some
cumulus clouds developing during the day. Winds have picked up a little to
around 10mph, coming in out of the southwest.

While yesterday was another hot day, the high of 89F means that our official
heat wave has come to an end at four days (6/30-7/3). Still, the duration of
this hot weather pattern has been impressive, with today marking 7
consecutive days with a high temperature of at least 87F.

PRELIMINARY STATS FOR JUNE 2018

TEMPERATURE, Deg. F
Avg. Max. 75.1 [+0.1] Avg. Min. 56.2 [-0.9] Mean      65.7 [-0.5] 24-hour corrected mean: 65.7
Max. for month: 90F on  30th
Min. for month: 45F on  3rd and 4th

HEATING DEGREE DAYS
Total heating units:   69   [-4] Total for the season:  5916 [-460] Total for last season: 5725

COOLING DEGREE DAYS
Total cooling units:    97 [-8] Total for the season:  159 [+30] Total for last season: 201

PRECIPITATION, Inches
Total: 2.85 [-1.46] Greatest in 24 hrs: 1.29 in on 27th-28th

WIND, mph
Avg. uncorrected wind speed: 10.3
Avg. corrected wind speed: 10.8
Prevailing wind direction: SSW at 30%
Peak gust and direction: 37 SW on 12th

SUNSHINE:
Campbell-Stokes card minutes: N/A
Astronomical total minutes: N/A

Today’s Observations:

7 A.M.
Weather: Mostly clear, few cirrus NNW-ESE, few cirrocumulus SW
Temperature: 78F; Dew Point: 72F; Wind: estimated WSW at 5 kts,
Wind: Light
Sea-level pressure: 30.30 ins. Hg, rising then steady
Visibility: 10 miles, hazy
6-hr Max temp: 78F
6-hr Min temp: 73F
24-hr Precip: 0.00 ins.
BHO SA 1155 CLR 10 262/78/72/E2405/030/ FEW CI NNW-ESE FEW CC SW
HAZY WND LGT/ 8/001 51005 10078 20073

10 A.M.
Weather: Mostly clear, few cumulus all quadrants, few cirrus NW-ESE
Temperature: 85F; Dew Point: 72F; Wind: WSW at 7 kts
Sea-level pressure: 30.28 ins. Hg, steady then falling
Visibility: 25 miles, hazy
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 25 254/85/72/2407/028/ FEW CU ALQDS FEW CI NW-ESE HAZY/
8/101 58008

1 P.M.
Weather: Broken cumulus, few moderate cumulus SW
Temperature: 89F; Dew Point: 73F; Wind: SSW at 12G18 kts
Sea-level pressure: 30.24 ins. Hg, falling, then more rapidly
Visibility: 25 miles, hazy
6-hr Max temp: 91F
6-hr Min temp: 78F
6-hr precip: 0.00 ins.
BHO SA 1755 E40 BKN 25 239/89/73/2112G18/024/ FEW MDT CU SW HAZY/
8/2// 58015 10091 20078

SUMMARY FOR WEDNESDAY, JULY 4, 2018 [INDEPENDENCE DAY]

TEMPERATURE (DEGREES F)
MAX…..89   NORMAL…..80
MIN…..73   NORMAL…..62
MEAN….81   NORMAL…..71

DEPARTURE FROM 30-YEAR NORMAL……………………+10
TOTAL DEPARTURE FOR THE MONTH……………………+43 [+10.6 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..16   DEPARTURE………+10
TOTAL COOLING UNITS FOR THE MONTH…………..65   DEPARTURE………+41
TOTAL COOLING UNITS FOR THE SEASON…………224   DEPARTURE………+71
TOTAL COOLING UNITS LAST SEASON TO DATE…….244   DEPARTURE………-20

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..17 NE  AT 9:08 A.M.
AERO…………………….15 NE  AT 9:08 A.M.
ASOS…………………….17 NE  AT 9:16 A.M.
DAVIS……………………16 M   AT 9:03 P.M.** RMY 16
FASTEST MILE FOR YESTERDAY………………….12 NE  AT 9:19 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….13 ENE AT 9:47 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………12 M   AT 9:53 P.M.**
AVERAGE WIND SPEED AND DIRECTION……………7.0 ENE
ASOS……………………7.3
DAVIS…………………..6.3
**Davis direction malfunctioning

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.10
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.00  DEPARTURE……-0.43
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE YEAR……….30.17  DEPARTURE……+2.95
ASOS………….31.73

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

6/01 78/62/70/+8/T/009/01            21 S   AERO 21 S   RMY N/A
6/02 79/54/67/+5/T/353/39            26 ENE AERO 25 ENE RMY 27
6/03 59/45/52/-10/0.00/816/90        28 ENE AERO 25 ENE RMY N/A
6/04 52/45/49/-14/0.82/000/00        29 ENE AERO 26 ENE RMY 29
6/05 64/47/56/-7/0.19/173/19         24 N   AERO 21 N   RMY 23  TSTM
6/06 66/50/58/-5/0.00/373/41         23 S   AERO 21 S   RMY 22
6/07 69/50/60/-4/0.00/282/31         25 S   AERO 25 S   RMY 27
6/08 79/52/66/+2/0.00/684/75         20 SW  AERO 17 SW  RMY 18
6/09 79/58/69/+5/0.00/767/84         22 W   AERO 21 W   RMY 22
6/10 72/56/64/-1/0.00/593/65         20 S   AERO 18 S   RMY 17
6/11 68/51/60/-5/0.00/594/65         21 ENE AERO 20 SSW RMY N/A
6/12 77/49/63/-2/0.00/814/89         37 SW  AERO 37 SW  RMY 39
6/13 74/56/65/0/T/284/31             35 SW  AERO 36 SW  RMY 36
6/14 77/61/69/+3/0.00/495/54         35 W   AERO 36 WNW RMY 37
6/15 68/53/61/-5/0.01/266/29         17 NNW AERO 16 WNW RMY 19
6/16 83/54/69/+3/0.00/761/83         25 NNW AERO 24 NNW RMY 25
6/17 86/63/75/+8/0.00/807/88         23 S   AERO 22 S   RMY N/A
6/18 86/64/75/+8/0.10/284/31         37 SSW AERO 37 SSW RMY 40  TSTM
6/19 81/64/73/+6/0.01/789/86         31 WSW AERO 32 WSW RMY 32
6/20 81/58/70/+2/0.00/459/50         22 W   AERO 21 W   RMY 23
6/21 81/62/72/+4/0.00/706/77         22 E   AERO 18 E   RMY 21
6/22 75/56/66/-2/0.00/688/75         24 ESE AERO 22 ESE RMY 24
6/23 65/55/60/-8/0.03/000/00         22 ENE AERO 21 NE  RMY 22
6/24 78/56/67/-2/0.26/009/01         21 SSW AERO 20 SSW RMY N/A
6/25 70/56/63/-6/0.14/449/49         30 N   AERO 29 N   RMY 31  TSTM
6/26 79/53/66/-3/0.00/824/90         24 SSW AERO 24 SSW RMY 25
6/27 78/59/69/0/0.13/…/..          26 S   AERO 28 S   RMY N/A
6/28 71/63/67/-3/1.16/000/00         28 S   AERO 26 S   RMY N/A TSTM
6/29 87/66/77/+7/0.00/…/..         18 W   AERO 16 W   RMY 18
6/30 90/69/80/+10/0.00/…/..        21 SSW AERO 20 SSW RMY 21

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

7/01 94/72/83/+13/0.00/…/..       21 ESE AERO 18 ESE RMY 19
7/02 90/68/79/+9/0.00/…/..        21 S   AERO 21 S   RMY 22
7/03 94/69/82/+11/0.00/…/..       20 SSW AERO 18 SW  RMY 19
7/04 89/73/81/+10/0.00/…/..       17 NE  AERO 15 NE  RMY 16

7/05 Low temp since midnight is 73F; normal low is now 62F

DAILY RECORDS FOR JULY 2018

07/01/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 72F,
TIES PREVIOUS RECORD OF 72F SET IN 1968

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

RECORDS FOR JULY 5
HIGH 98F IN 1911
LOW 48F IN 1920, 1927 & 1979
PRECIP 1.45 INS IN 1922
PEAK GUST 44e N IN 1944

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

TODAY’S REPORT PREPARED BY: Jonathan O’Brien