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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, JULY 6, 2018 
ALL TIMES ARE IN EASTERN STANDARD TIME

THUNDERSTORM BRINGS SHORT RESPITE FROM HEAT BUT THE HIGH
HUMIDITY LINGERS...

The day was overall hot and sticky again with dew points 
continuing to be in the 70's. We did have a short respite 
from the heat midday with a low of 69F between 10:00 A.M 
and 1:00 P.M. After another above normal temperature day 
yesterday with a high of 91F, temps. have decreased today with 
a high of 80F so far today. This is also the daily normal. A 
thunderstorm began today around 10:15 A.M. EST and ended just 
before noon. During the storm we had close lightning and rain 
that was heavy at times. This is the first rainfall in July 
and we measured 0.56 ins. so far today by 1:00 P.M. After the 
thunderstorm moved out high humidity returned to 96% by 1:00 P.M.
The wind continues to be from the SSW and picked up overnight.
It was gusty this morning with a peak gust so far today of 37
MPH (32 kts) at 5:47 A.M. Wind was also strong with gust
up to 30 MPH (26 kts) during the thunderstorm. 

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: Broken stratocumulus, broken altostratus
Temperature: 78F; Dew Point: 71F; Wind: estimated SW at 16G26 kts,
Peak wind: 29 kts (33 MPH) SW at 5:56 A.M. 
Sea-level pressure: 29.98 ins. Hg, falling, then more slowly
Visibility: 30 miles, distant haze in all directions
6-hr Max temp: 78F
6-hr Min temp: 74F
24-hr Precip: Trace 
BHO SA 1155 E23 BKN E100 BKN 30 154/78/71/2216G26/998/ 
DSNT HZ ALQDS PK WND 2229/0556/ 8/510 56007 10078 20074

10 A.M.
Weather: Scattered stratocumulus, broken altocumulus,
overcast altostratus
Temperature: 78F; Dew Point: 73F; Wind: SSW at 14G20 kts
Sea-level pressure: 29.94 ins. Hg, falling
Visibility: 30 miles, hazy
3-hr Precip: 0.04 ins. 
BHO SA 1455 20 SCT E90 BKN E110 OVC 20 140/78/73/2114G20/994/ 
RW-B35E50 HAZY/ 8/51/ 56014 MANUAL 6004/ ASOS 60004 

1 P.M.
Weather: Few stratus fractus NNW-S, few towering cumulus 
W-NW, Scattered stratocumulus, overcast altostratus, thin
spots in overcast. Rain ends 12:45 P.M. 
Temperature: 72F; Dew Point: 71F; Wind: SSW at 8G14 kts
Sea-level pressure: 30.24 ins. Hg, rising then falling
Visibility: 15 miles, distant fog in all directions
6-hr Max temp: 80F
6-hr Min temp: 69F
6-hr precip: 0.56 ins.
BHO SA 1755 E55 SCT E190 OVC 15 140/72/71/2108G14/994/ FEW STFA 
NNW-S FEW TCU W-NW THN SPTS IOVC VSBY 5 NNW R-E45 DSNT FG ALQDS/ 
8/51/ 50000 10080 20069 MANUAL 6056/ 

SUMMARY FOR THURSDAY, JULY 5, 2018 

TEMPERATURE (DEGREES F)
MAX.....91   NORMAL.....80
MIN.....73   NORMAL.....62
MEAN....82   NORMAL.....71

DEPARTURE FROM 30-YEAR NORMAL........................+11
TOTAL DEPARTURE FOR THE MONTH........................+54 [+10.6 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY..............17   DEPARTURE.........+11
TOTAL COOLING UNITS FOR THE MONTH..............82   DEPARTURE.........+51
TOTAL COOLING UNITS FOR THE SEASON............241   DEPARTURE.........+81
TOTAL COOLING UNITS LAST SEASON TO DATE.......251   DEPARTURE.........-10

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................29 SSW AT 11:12 P.M.
                   AERO.........................28 SSW AT  9:45 P.M.
                   ASOS.........................30 NE  AT 10:52 P.M.
                   DAVIS........................30 M   AT 11:12 P.M.** RMY N/A
FASTEST MILE FOR YESTERDAY......................24 SSW AT 10:57 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...................23 SW  AT 10:57 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................24 M   AT 10:53 P.M.**
AVERAGE WIND SPEED AND DIRECTION..............11.8 SW
                   ASOS.......................11.4
                   DAVIS.......................9.3
**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......-0.54
                         ASOS..............0.00  
TOTAL PRECIPITATION FOR THE YEAR..........30.17  DEPARTURE......+2.84
                         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 78/59/69/0/0.13/156/17          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 Low temp since midnight is 74F; 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 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

RECORDS FOR JULY 7
HIGH 97F IN 1908,1993
LOW 48F IN 1902
PRECIP 2.11 INS IN 1966
PEAK GUST 55 MPH NW IN 1989

TODAY'S REPORT PREPARED BY: K. Geagan