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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, JULY 8, 2018 
ALL TIMES ARE IN EASTERN STANDARD TIME

A CLEAR AND DRY DAY WITH HIGH PRESSURE AND LIGHT WINDS....

We have observed light and variable winds for most of 
the day today, not frequently exceeding 10 mph. Skies 
have remained clear, save some scattered cirrostratus
clouds at the 1 P.M. observation. Humidity has been less
than forty percent since 10 A.M. Visibility was decreased 
to forty miles by a thin layer of fog this morning, but 
has been 70 miles since then. The maximum temperature
observed so far today is 82F, 2 degrees above the daily
normal maximum of 80F. The low since midnight is 57F, 
6 degrees below the normal minimum of 63F.

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: 13404 minutes of possible 26376 or 51%
Astronomical total minutes: 13945 minutes of possible 27417 or 51%

Today's Observations:

7 A.M.
Weather: Clear, few cirrus S-E
Temperature: 68F; Dew Point: 53F; Wind: N at 2 kts,
Wind: Light and variable 
Sea-level pressure: 30.36 ins. Hg, rising then falling
Visibility: 40 miles, thin smoke layer in all directions
6-hr Max temp: 68F
6-hr Min temp: 57F
24-hr Precip: 0.00 ins.  
BHO SA 1155 CLR 40 280/68/53/3602/036/ FEW CI S-E THN K LYR ALQDS
WND L/V/ 8/001 58005 10068 20057

10 A.M.
Weather: Clear, few cumulus in all directions
Temperature: 76F; Dew Point: 49F; Wind: WSW at 2 kts,
Wind: Light and variable
Sea-level pressure: 30.37 ins. Hg, rising then falling
Visibility: 70 miles
3-hr Precip: 0.00 ins. 
BHO SA 1455 CLR 70 284/76/49/2402/037/ FEW CU ALQDS WND L/V/ 
8/100 50000 

1 P.M.
Weather: Scattered cirrostratus, few cumulus SSW-SE
Temperature: 82F; Dew Point: 52F; Wind: S at 4 kts,
Wind: Light
Sea-level pressure: 30.32 ins. Hg, falling, then more rapidly 
Visibility: 70 miles
6-hr Max temp: 82F
6-hr Min temp: 68F
6-hr precip: 0.00 ins. 
BHO SA 1755 250 SCT 70 269/82/52/1804/032/ FEW CU SSW-SE WND LGT/ 
8/108 58016 10082 20068  

SUMMARY FOR SATURDAY, JULY 7, 2018 

TEMPERATURE (DEGREES F)
MAX.....78   NORMAL.....80
MIN.....54   NORMAL.....62
MEAN....66   NORMAL.....71

DEPARTURE FROM 30-YEAR NORMAL.........................-5
TOTAL DEPARTURE FOR THE MONTH........................+48 [+6.7 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............1   DEPARTURE..........-6
TOTAL COOLING UNITS FOR THE MONTH..............88   DEPARTURE.........+44
TOTAL COOLING UNITS FOR THE SEASON............247   DEPARTURE.........+78
TOTAL COOLING UNITS LAST SEASON TO DATE.......258   DEPARTURE.........-11

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................22 N   AT 12:14 A.M.
                   AERO.........................18 N   AT 12:12 A.M.
                   ASOS..........................M ***
                   DAVIS........................23 M ***    RMY N/A
FASTEST MILE FOR YESTERDAY......................14 N   AT 12:41 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE....................M ***
MAXIMUM 2-MINUTE DAVIS AVERAGE...................M ***
AVERAGE WIND SPEED AND DIRECTION...............7.8 NNW
                   ASOS..........................M ***
                   DAVIS.......................8.2 M

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..........0.56  DEPARTURE......-0.20
                         ASOS..............0.00***  
TOTAL PRECIPITATION FOR THE YEAR..........30.73  DEPARTURE......+3.18
                         ASOS.............31.73***

***ASOS and parts of Davis systems down due to lightning storm

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 78/59/69/0/0.13/156/17          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/+7/0.00/824/90         18 W   AERO 16 W   RMY 18
6/30 90/69/80/+10/0.00/686/75        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 TSTM
7/04 89/73/81/+10/0.00/.../..       17 NE  AERO 15 NE  RMY 16
7/05 91/73/82/+11/0.00/.../..       29 SSW AERO 28 SSW RMY N/A
7/06 80/59/70/-1/0.56/.../..        37 NNW AERO 38 SW  RMY 40 TSTM
7/07 78/54/66/-5/0.00/.../..        22 N   AERO 18 N   RMY N/A 

7/08 Low temp since midnight is 68F; normal low is now 63F

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 8
HIGH 95F IN 1981
LOW 50F IN 1919
PRECIP 1.74 INS IN 1916
PEAK GUST 46e SSW IN 1941

RECORDS FOR JULY 9
HIGH 98F IN 1912
LOW 47F IN 1909
PRECIP 3.74 INS IN 1921
WIND 46 MPH NW IN 1992 

TODAY'S REPORT PREPARED BY: Benjamin Turner