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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, JULY 1, 2018  
ALL TIMES ARE IN EASTERN STANDARD TIME

HEAT CONTINUES ON TOP OF GREAT BLUE HILL...

Today temperatures continue to be above normal with
a max of 93F so far. This is already 14 degrees above
the daily normal of 79F and 5 degrees below the daily
record high temperatures of 98F set in 1964. The low 
since midnight is 72F. If the temperatures does not drop
below 72 before midnight this will tie the record for
high minimum temperature originally set in 1968. A 
distant haze lingered today obscuring visibility to 
20 miles in the morning and 40 miles, once humidity dropped, 
in the afternoon. Skies remained mostly sunny and cloud 
cover decreased throughout the day. The wind shifted today 
from SW to NW then became light and variable again today.
June ended around seasonable for temperatures with the
month beginning below normal and ending above. This is
also the second month in a row with below normal rainfall.
Although June was a drier than average month, we are still
over 3 inches above normal for our annual rainfall.  

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 altocumulus, broken cirrostratus
Temperature: 77F; Dew Point: 67F; Wind: W at 9G14 kts
Sea-level pressure: 30.00 ins. Hg, rising then falling
Visibility: 20 miles, distant haze
6-hr Max temp: 77F
6-hr Min temp: 72F
24-hr Precip: 0.00 ins. 
BHO SA 1155 140 SCT E250 BKN 20 160/77/67/2809G14/000/ 
DSNT HZ/ 8/058 50001 10077 20072

10 A.M.
Weather: Scattered altocumulus, broken cirrostratus
Temperature: 89F; Dew Point: 72F; Wind: NNW at 4 kts,
Wind: Light 
Sea-level pressure: 30.01 ins. Hg, rising then falling 
Visibility: 20 miles, distant haze
3-hr Precip: 0.00 ins. 
BHO SA 1455 140 SCT E250 BKN 20 163/89/72/3304/001/ 
DSNT HZ WND LGT/ 8/058 52003 

1 P.M.
Weather: Scattered cumulus, broken cirrostratus
Temperature: 92F; Dew Point: 71F; Wind: SE at 4 kts,
Wind: Light and variable
Sea-level pressure: 30.01 ins. Hg, rising then falling 
Visibility: 40 miles, distant haze
6-hr Max temp: 93F
6-hr Min temp: 77F
6-hr precip: 0.00 ins.
BHO SA 1755 43 SCT E250 BKN 40 164/92/71/1304/001/ 
DSNT HZ ALQDS WND L/V/ 8/106 10093 20077

SUMMARY FOR SATURDAY, JUNE 30, 2018

TEMPERATURE (DEGREES F)
MAX.....90   NORMAL.....79
MIN.....69   NORMAL.....61
MEAN....80   NORMAL.....70

DEPARTURE FROM 30-YEAR NORMAL........................+10
TOTAL DEPARTURE FOR THE MONTH.........................-6 [-0.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............0   DEPARTURE...........-1
TOTAL HEATING UNITS FOR THE MONTH.............69   DEPARTURE...........-4
TOTAL HEATING UNITS FOR THE SEASON..........5916   DEPARTURE.........-460
TOTAL HEATING UNITS LAST SEASON TO DATE.....5725   DIFFERENCE........+191

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY..............15   DEPARTURE..........+9
TOTAL COOLING UNITS FOR THE MONTH..............97   DEPARTURE..........-8
TOTAL COOLING UNITS FOR THE SEASON............159   DEPARTURE.........+30
TOTAL COOLING UNITS LAST SEASON TO DATE.......201   DEPARTURE.........-42

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................21 SSW AT 8:46 P.M.*
                   AERO.........................20 SSW AT 8:35 P.M.
                   ASOS.........................21 SSW AT 8:45 P.M.
                   DAVIS........................23 M   AT 4:39 P.M.** RMY 18
FASTEST MILE FOR YESTERDAY......................17 SSW AT 8:32 P.M.*
MAXIMUM 2-MINUTE ASOS AVERAGE...................17 SSW AT 8:35 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................16 M   AT 8:35 P.M.**
AVERAGE WIND SPEED AND DIRECTION...............8.3 SW
                   ASOS........................8.4
                   DAVIS.......................8.4
*Last of several occurrences
**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..........2.85  DEPARTURE......-1.46
                         ASOS..............2.86  
TOTAL PRECIPITATION FOR THE YEAR..........30.17  DEPARTURE......+3.38
                         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/.../..         24 ESE AERO 22 ESE RMY 24
6/23 65/55/60/-8/0.03/.../..         22 ENE AERO 21 NE  RMY 22 
6/24 78/56/67/-2/..../.../..         21 SSW AERO 20 SSW RMY N/A 
6/25 70/56/63/-6/..../.../..         30 N   AERO 29 N   RMY 31  TSTM
6/26 79/53/66/-3/0.00/.../..         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

7/1 Low temp since midnight is 72F; normal low is now 61F

DAILY RECORDS FOR JUNE 2018

None

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

RECORDS FOR JULY 1
HIGH 98F IN 1964
LOW 44F IN 1988 [RECORD FOR MONTH]
PRECIP 4.46 INS IN 1915 [RECORD FOR MONTH]
PEAK GUST 52 MPH WNW IN 1974

RECORDS FOR JULY 2
HIGH 95F IN 1963
LOW 47F IN 1988
PRECIP 1.42 INS IN 1986
PEAK GUST 45 MPH SW IN 1999

TODAY'S REPORT PREPARED BY: Kaitlin Geagan