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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, JUNE 26, 2018  
ALL TIMES ARE IN EASTERN STANDARD TIME

LIGHT WIND, GOOD VISIBILITY, AND CLEAR SKIES
ON GREAT BLUE HILL.... 

Wind remained light since this morning, becoming 
calm at times. The air became drier as the day 
went on, with an observed humidity of 30% at 1:00 P.M.
Visibility remained at 70 miles, due in part to low
humidity and high pressure. The maximum temperature
so far today is 75F, 3 degrees below the daily normal
of 78F. The low since midnight is 61F, a degree
higher than the normal minimum of 60F.

Today's Observations:

7 A.M.
Weather: Few cumulus N-NE  
Temperature: 61F; Dew Point: 51F; Wind: W at 6 kts,
Wind: Light
Sea-level pressure: 30.27 ins. Hg, rising, then more slowly
Visibility: 70 miles 
6-hr Max temp: 61F
6-hr Min temp: 53F
24-hr Precip: 0.01 ins. 
BHO SA 1155 CLR 70 251/61/51/2906/027/ FEW CU N-NE WND LGT/ 
8/100 51015 MANUAL 70001 ASOS 70001 10061 20053

10 A.M.
Weather: Few cumulus in all directions, few cirrostratus
SE-W
Temperature: 70F; Dew Point: 42F; Wind: WNW at 4 kts,
Wind: Light
Sea-level pressure: 30.27 ins. Hg, steady 
Visibility: 70 miles
3-hr Precip: 0.00 ins. 
BHO SA 1455 CLR 70 251/70/42/3004/027/ FEW CU ALQDS FEW 
CS SE-W WND LGT/ 8/105 58000 

1 P.M.
Weather: Few cumulus SE-S, few cirrostratus S-SW  
Temperature: 75F; Dew Point: 42F; Wind: WSW at 6 kts,
Wind: Light
Sea-level pressure: 30.22 ins. Hg, falling, then more rapidly
Visibility: 70 miles
6-hr Max temp: 75F
6-hr Min temp: 61F
6-hr precip: 0.00 ins.
BHO SA 1755 CLR 70 232/75/42/2406G13/022/ FEW CU SE-S FEW CS 
S-SW WND LGT/ 8/105 58019 10075 20061 

SUMMARY FOR MONDAY, JUNE 25, 2018

TEMPERATURE (DEGREES F)
MAX.....70   NORMAL.....78
MIN.....56   NORMAL.....60
MEAN....63   NORMAL.....69

DEPARTURE FROM 30-YEAR NORMAL.........................-6
TOTAL DEPARTURE FOR THE MONTH........................-17 [-0.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............2   DEPARTURE...........+1
TOTAL HEATING UNITS FOR THE MONTH.............69   DEPARTURE...........-1
TOTAL HEATING UNITS FOR THE SEASON..........5916   DEPARTURE.........-456
TOTAL HEATING UNITS LAST SEASON TO DATE.....5724   DIFFERENCE........+192

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............0   DEPARTURE..........-3
TOTAL COOLING UNITS FOR THE MONTH..............63   DEPARTURE.........-14
TOTAL COOLING UNITS FOR THE SEASON............125   DEPARTURE.........+24
TOTAL COOLING UNITS LAST SEASON TO DATE.......185   DEPARTURE.........-60

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................30 N   AT 10:22 A.M.
                   AERO.........................29 N   AT 10:34 A.M.
                   ASOS.........................31 NNW AT 10:22 A.M.
                   DAVIS........................32 M   AT 10:20 A.M.** RMY 31
FASTEST MILE FOR YESTERDAY......................22 N   AT 10:22 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...................21 NW  AT 10:22 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................21 M   AT 10:22 A.M.**
AVERAGE WIND SPEED AND DIRECTION...............9.2 E
                   ASOS........................9.9
                   DAVIS.......................8.9
**Davis direction malfunctioning 

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.01  DEPARTURE......-0.11
                         ASOS..............0.01
TOTAL PRECIPITATION FOR THE MONTH..........1.56  DEPARTURE......-2.18
                         ASOS..............1.57  
TOTAL PRECIPITATION FOR THE YEAR..........28.88  DEPARTURE......+2.66
                         ASOS.............30.44


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/.../..         25 NNW AERO 24 NNW RMY 25
6/17 86/63/75/+8/0.00/.../..         23 S   AERO 22 S   RMY N/A
6/18 86/64/75/+8/0.10/.../..         37 SSW AERO 37 SSW RMY 40  TSTM
6/19 81/64/73/+6/0.01/.../..         31 WSW AERO 32 WSW RMY 32 
6/20 81/58/70/+2/0.00/.../..         22 W   AERO 21 W   RMY 23 
6/21 81/62/72/+4/0.00/.../..         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/..../.../..         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 Low temp since midnight is 53F; normal low is now 60F

DAILY RECORDS FOR JUNE 2018

None so far.

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

RECORDS FOR JUNE 26
HIGH 96F IN 1952
LOW 45F IN 1986
PRECIP 1.52 INS IN 1945
PEAK GUST 48 MPH N IN 1998

RECORDS FOR JUNE 27
HIGH 93F IN 1999, 2007
LOW 46F IN 1897
PRECIP 1.72 INS IN 1938
PEAK GUST 55e N IN 1945

TODAY'S REPORT PREPARED BY: Benjamin Turner