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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, AUGUST 10, 2018 
ALL TIMES ARE IN EASTERN STANDARD TIME

WIND FROM THE NORTHWEST BRINGS COOLER, DRIER AIR TO
GREAT BLUE HILL... 

Dew points returned to more comfortable temperatures today 
with a high so far of 65F. Dew points have been in the low
70's recently making for oppressive feeling humidity. 
Yesterday afternoon the wind shifted from the SW to the NW 
bringing slightly cooler drier air into the area. The wind 
has been light so far today. We still have haze lingering 
in the area holding the visibility to 35 miles all day. 
The day started with a clear sky and only a few clouds, 
but they increased throughout the day, and we had scattered 
cumulus at the 1:00 P.M. observation. 

Today's Observations:

7 A.M.
Weather: Clear, few altocumulus NNW-NNE
Temperature: 71F; Dew Point: 63F; Wind: NW at 5 kts,
Wind: Light
Sea-level pressure: 29.86 ins. Hg, rising then, more rapidly 
Visibility: 35 miles, distant haze 
6-hr Max temp: 71F
6-hr Min temp: 66F
24-hr Precip: Trace  
BHO SA 1155 CLR 35 111/71/63/3005/986/ FEW AC NNW-NNE 
DSNT HZ ALQDS WND LGT/ 8/060 53013 10071 20066

10 A.M.
Weather: Clear, few cumulus WNW-E
Temperature: 81F; Dew Point: 65F; Wind: NW at 5 kts,
Wind: Light
Sea-level pressure: 29.89 ins. Hg, rising, then more slowly 
Visibility: 35 miles, distant haze
3-hr Precip: 0.00 ins.  
BHO SA 1455 CLR 35 122/81/65/3005/989/ FEW CU WNW-E DSNT 
HZ ALQDS WND LGT/ 8/100 51011 

1 P.M.
Weather: Scattered cumulus 
Temperature: 82F; Dew Point: 64F; Wind: NW at 4 kts,
Wind: Light 
Sea-level pressure: 29.89 ins. Hg, rising then steady 
Visibility: 35 miles, distant haze
6-hr Max temp: 85F
6-hr Min temp: 71F
6-hr precip: 0.00 ins. 
BHO SA 1755 50 SCT 35 121/82/64/3204/989/ DSNT HZ ALQDS WND 
LGT/ 8/100 56001 10085 20071 

SUMMARY FOR THURSDAY, AUGUST 9, 2018 

TEMPERATURE (DEGREES F)
MAX.....86   NORMAL.....80
MIN.....70   NORMAL.....63
MEAN....78   NORMAL.....72

DEPARTURE FROM 30-YEAR NORMAL.........................+6
TOTAL DEPARTURE FOR THE MONTH........................+67 [+7.2 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY..............13   DEPARTURE..........+6
TOTAL COOLING UNITS FOR THE MONTH.............130   DEPARTURE.........+66
TOTAL COOLING UNITS FOR THE SEASON............585   DEPARTURE........+170
TOTAL COOLING UNITS LAST SEASON TO DATE.......479   DEPARTURE........+106

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY.....................29 SW AT 2:32 A.M.
                   AERO..........................28 SW AT 2:32 A.M.
                   ASOS..........................29 SW AT 2:32 A.M.
                   DAVIS.........................27 SW AT 2:26 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY.......................20 SW AT 2:32 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE....................21 SW AT 2:32 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE...................20 SW AT 2:27 A.M.
AVERAGE WIND SPEED AND DIRECTION................9.5 WNW
                   ASOS........................10.2
                   DAVIS........................9.7 W [269 deg.] 

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.14
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........2.12  DEPARTURE......+0.80
                         ASOS..............2.14 
TOTAL PRECIPITATION FOR THE YEAR..........36.13  DEPARTURE......+4.00
                         ASOS.............37.72

PRELIMINARY CLIMATE SUMMARY FOR AUGUST 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

8/1  82/66/74/+2/T/.../..           31 S   AERO 30 S   RMY 31
8/2  92/74/83/+11/0.00/.../..       30 SW  AERO 28 SW  RMY 31 
8/3  88/74/81/+9/0.19/.../..        35 NW  AERO 32 NW  RMY 35 TSTM
8/4  82/69/76/+4/1.16/.../..        28 SW  AERO 25 SW  RMY 30 TSTM
8/5  89/66/78/+6/0.00/.../..        20 W   AERO 18 W   RMY 19
8/6  92/71/82/+10/0.00/.../..       20 W   AERO 16 WSW RMY N/A
8/7  92/73/83/+11/0.00/.../..       25 S   AERO 23 S   RMY 26
8/8  88/71/80/+8/..../.../..        25 SSW AERO 25 SSW RMY N/A TSTM 
8/9  86/70/78/+6/..../.../..        29 SW  AERO 28 SW  RMY N/A TSTM

8/10 Low temp since midnight is 66F; normal low is now 63F

DAILY RECORDS FOR AUGUST 2018

08/03/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 74F, 
          BREAK PREVIOUS RECORD OF 71F SET IN 1928, 1969, AND 1979

08/07/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 73F, 
          BREAK PREVIOUS RECORD OF 72F SET IN 1988

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

RECORDS FOR AUGUST 10
HIGH 101F IN 1949 [STATION RECORD MAXIMUM - Tied with 8/2/1975]
LOW 49F IN 1964
PRE 2.27 INS IN 1952
PEAK GUST 88e MPH S IN 1976

RECORDS FOR AUGUST 11
HIGH 97F IN 1944
LOW 49F IN 1972
PRECIP 3.13 INCHES IN 1990
PEAK GUST 44 MPH SW IN 1971

TODAY'S REPORT PREPARED BY: Kaitlin Geagan