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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, JULY 3, 2018  
ALL TIMES ARE IN EASTERN STANDARD TIME

A HAZY AND HOT DAY WITH INCREASING CLOUDS IN THE
AFTERNOON....

Haze has obscured visibility to 20 miles today at each 
observation. Clear skies this morning led to the sky being 
almost overcast with cirrus clouds by 1:00 P.M. Humidity
has decreased throughout the day, dropping to less than 
50% by noontime. Temperatures stay above seasonable, with 
a high so far today of 93F. This is 13 degrees above the daily
normal of 80F. The low since midnight was 69F, 7 degrees above
the normal minimum.

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: Clear, few cirrus in all directions
Temperature: 76F; Dew Point: 71F; Wind: SSW at 7G14 kts
Sea-level pressure: 30.16 ins. Hg, rising then more quickly
Visibility: 20 miles, haze
6-hr Max temp: 76F
6-hr Min temp: 69F
24-hr Precip: 0.00 ins. 
BHO SA 1155 CLR 20 212/76/71/2107G14/016/ FEW CI ALQDS 
HAZY/ 8/002 53007 10076 20069

10 A.M.
Weather: Clear, few cirrus in all directions
Temperature: 88F; Dew Point: 71F; Wind: SSW at 9G14 kts
Sea-level pressure: 30.17 ins. Hg, rising steadily 
Visibility: 20 miles, haze
3-hr Precip: 0.00 ins. 
BHO SA 1455 CLR 20 216/88/71/2109G14/017/ FEW CI ALQDS HAZY/ 
8/002 51004 

1 P.M.
Weather: Broken cirrus, few cumulus WSW-NE
Temperature: 93F; Dew Point: 71F; Wind: SSW at 10G16 kts 
Sea-level pressure: 30.16 ins. Hg, falling, then more quickly 
Visibility: 20 miles, haze
6-hr Max temp: 93F
6-hr Min temp: 76F
6-hr precip: 0.00 ins.
BHO SA 1755 E250 BKN 20 215/93/71/210G16/016/ FEW CU WSW-NE HAZY/
8/002 58001 10093 20076 

SUMMARY FOR MONDAY, JULY 2, 2018

TEMPERATURE (DEGREES F)
MAX.....90   NORMAL.....79
MIN.....68   NORMAL.....62
MEAN....79   NORMAL.....70

DEPARTURE FROM 30-YEAR NORMAL.........................+9
TOTAL DEPARTURE FOR THE MONTH........................+22 [+11.2 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY..............14   DEPARTURE..........+8
TOTAL COOLING UNITS FOR THE MONTH..............32   DEPARTURE.........+20
TOTAL COOLING UNITS FOR THE SEASON............191   DEPARTURE.........+50
TOTAL COOLING UNITS LAST SEASON TO DATE.......225   DEPARTURE.........-34

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................21 S   AT 4:10 P.M.
                   AERO.........................21 S   AT 4:54 P.M.
                   ASOS.........................23 S   AT 4:10 P.M.
                   DAVIS........................24 M   AT 4:54 P.M.** RMY 18
FASTEST MILE FOR YESTERDAY......................16 S   AT 4:56 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...................16 S   AT 4:10 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................15 M   AT 6:35 P.M.**
AVERAGE WIND SPEED AND DIRECTION...............8.2 S
                   ASOS........................8.9
                   DAVIS.......................7.8

**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......-0.11
                         ASOS..............0.00  
TOTAL PRECIPITATION FOR THE YEAR..........30.17  DEPARTURE......+3.16
                         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 Low temp since midnight is 69F; 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 3
HIGH 99F IN 1911
LOW 47F IN 1914
PRECIP 1.36 IN 1985
PEAK GUST 52 MPH NW IN 1963

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

TODAY'S REPORT PREPARED BY: Benjamin Turner