Wednesday, July 4, 2018

| July 4, 2018 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, JULY 4, 2018 [HAPPY INDEPENDENCE DAY!]
ALL TIMES ARE IN EASTERN STANDARD TIME

A FAIR, ABOVE SEASONABLE INDEPENDENCE DAY ON
GREAT BLUE HILL…

Despite high pressure and dry air in the region, visibility
has remained at or below 40 miles at each observation.
The temperature so far today is 89F, 9 degrees above the
normal maximum of 80F. The low since midnight is 70F,
8 degrees above the normal minimum of 62F.

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: Scattered cumulus, scattered cirrus
Temperature: 80F; Dew Point: 67F; Wind: NE at 7G12 kts
Sea-level pressure: 30.31 ins. Hg, rising steadily
Visibility: 40 miles, thin smoke layer in all directions
6-hr Max temp: 80F
6-hr Min temp: 73F
24-hr Precip: 0.00 ins.
BHO SA 1155 60 SCT 250 SCT 40 265/80/67/0407G12/031/ THN K
LYR ALQDS/ 8/202 52019 10080 20073

10 A.M.
Weather: Scattered cirrus
Temperature: 84F; Dew Point: 63F; Wind: E at 8G14 kts
Sea-level pressure: 30.32 ins. Hg, rising steadily
Visibility: 40 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 250 SCT 40 269/84/63/0708G14/032/ 8/002 53004

1 P.M.
Weather: Scattered cirrus, few cumulus S-NW
Temperature: 88F; Dew Point: 65F; Wind: NE at 5G12 kts,
Wind: Light
Sea-level pressure: 30.32 ins. Hg, falling, then more quickly
Visibility: 40 miles
6-hr Max temp: 89F
6-hr Min temp: 80F
6-hr precip: 0.00 ins.
BHO SA 1755 220 SCT 40 268/88/65/0405G12/032/ FEW CU S-NW WND LGT/
8/202 58001 10089 20080

SUMMARY FOR TUESDAY, JULY 3, 2018

TEMPERATURE (DEGREES F)
MAX…..94   NORMAL…..79
MIN…..69   NORMAL…..62
MEAN….82   NORMAL…..70

DEPARTURE FROM 30-YEAR NORMAL……………………+11
TOTAL DEPARTURE FOR THE MONTH……………………+33 [+11.2 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..17   DEPARTURE………+11
TOTAL COOLING UNITS FOR THE MONTH…………..49   DEPARTURE………+31
TOTAL COOLING UNITS FOR THE SEASON…………208   DEPARTURE………+61
TOTAL COOLING UNITS LAST SEASON TO DATE…….236   DEPARTURE………-28

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..20 SSW AT 1:35  P.M.
AERO…………………….18 SSW AT 2:04  P.M.
ASOS…………………….20 S   AT 6:40  P.M.
DAVIS……………………20 M   AT 12:49 A.M.** RMY 19
FASTEST MILE FOR YESTERDAY………………….16 SSW AT 12:56 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….16 SSW AT 1:35  P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………16 M   AT 1:35  P.M.**
AVERAGE WIND SPEED AND DIRECTION……………9.4 SSW
ASOS……………………9.8
DAVIS…………………..9.4

**Davis direction malfunctioning

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.11
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.00  DEPARTURE……-0.33
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE YEAR……….30.17  DEPARTURE……+3.05
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 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 4
HIGH 98F IN 1911, 1919, 1949
LOW 48F IN 1914
PRECIP 2.48 IN 2014
PEAK GUST 50e MPH WNW IN 1949

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

TODAY’S REPORT PREPARED BY: Benjamin Turner

 

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