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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, AUGUST 21, 2018 
ALL TIMES ARE IN EASTERN STANDARD TIME

OVERCAST DAY WITH LIGHT MORNING DRIZZLE...

Skies remained overcast today with light drizzle this
morning. So far today we have only measured a trace
of precipitation. Visibility varied today from 25-35
miles and was obscured by a distant fog all day. Wind
today has been from the E-NE and has been lighter after
a breezy afternoon yesterday. Max temperatures for today
and yesterday have been below normal with a max yesterday
of 72F and a max so far today of 68. The daily normal
max temperature is 79F for both days. The low temperature
since midnight of 61F is also the daily normal. The
dew point was consistent today at 62F for most of the day.

Today's Observations:

7 A.M.
Weather: Very light drizzle, overcast nimbostratus 
Temperature: 64F; Dew Point: 62F; Wind: NNE at 4 kts,
Wind: Light
Sea-level pressure: 30.16 ins. Hg, rising, then more slowly 
Visibility: 30 miles, distant fog in all directions 
6-hr Max temp: 64F
6-hr Min temp: 61F
24-hr Precip: 0.00 ins.  
BHO SA 1155 E20 OVC 30L- 214/64/62/0204/016/ DSNT FG 
ALQDS PCPN VRY LGT WND LGT/ 8/02/ 51006 10064 20061 

10 A.M.
Weather: Very light drizzle, broken stratus fractus, 
overcast nimbostratus
Temperature: 65F; Dew Point: 62F; Wind: E at 7G14 kts
Sea-level pressure: 30.16 ins. Hg, steady then falling
Visibility: 25 miles, distant fog in all directions
3-hr Precip: Trace 
BHO SA 1455 E15 BKN E25 OVC 25L- 212/65/62/0807G14/016/ 
DSNT FG ALQDS PCPN VRY LGT/ 8/72/ 58002 MANUAL 600//  

1 P.M.
Weather: Broken stratus fractus, overcast stratus,
few stratocumulus NE-SE
Temperature: 67F; Dew Point: 62F; Wind: E at 7G12 kts
Sea-level pressure: 30.12 ins. Hg, falling, then more rapidly 
Visibility: 35 miles, distant fog in all directions
6-hr Max temp: 68F
6-hr Min temp: 63F
6-hr Precip: Trace 
BHO SA 1755 E15 BKN E25 OVC 35 199/67/62/0807G12/012/ FEW 
SC NE-SE DSNT FG ALQDS/ 8/6// 58013 MANUAL 600// 10068 20063   

SUMMARY FOR MONDAY, AUGUST 20, 2018 

TEMPERATURE (DEGREES F)
MAX.....72   NORMAL.....79
MIN.....61   NORMAL.....62
MEAN....67   NORMAL.....70

DEPARTURE FROM 30-YEAR NORMAL.........................-3
TOTAL DEPARTURE FOR THE MONTH........................+80 [+3.8 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............2  DEPARTURE..........-4
TOTAL COOLING UNITS FOR THE MONTH.............208  DEPARTURE.........+75
TOTAL COOLING UNITS FOR THE SEASON............663  DEPARTURE........+179
TOTAL COOLING UNITS LAST SEASON TO DATE.......568  DEPARTURE.........+95

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY.....................28 ENE AT 10:46 A.M.
                   AERO..........................25 ENE AT 10:42 A.M.
                   ASOS..........................27 ENE AT 10:47 A.M.
                   DAVIS.........................27 ENE AT 10:46 A.M. RMY 27
FASTEST MILE FOR YESTERDAY.......................17 ENE AT 10:49 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE....................18 ENE AT 10:48 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE...................19 NE  AT 10:47 A.M.
AVERAGE WIND SPEED AND DIRECTION...............13.4 NE
                   ASOS........................13.1
                   DAVIS.......................13.5 NE [53 deg.] 

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.13
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........3.56  DEPARTURE......+0.81
                         ASOS..............3.53 
TOTAL PRECIPITATION FOR THE YEAR..........37.57  DEPARTURE......+4.01
                         ASOS.............39.11

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/199/23           31 S   AERO 30 S   RMY 31
8/2  92/74/83/+11/0.00/761/88       30 SW  AERO 28 SW  RMY 31 
8/3  88/74/81/+9/0.19/492/57        35 NW  AERO 32 NW  RMY 35 TSTM
8/4  82/69/76/+4/1.16/301/35        28 SW  AERO 25 SW  RMY 30 TSTM
8/5  89/66/78/+6/0.00/815/95        20 W   AERO 18 W   RMY 19
8/6  92/71/82/+10/0.00/822/96       20 W   AERO 16 WSW RMY N/A
8/7  92/73/83/+11/0.00/682/80       25 S   AERO 23 S   RMY 26
8/8  88/71/80/+8/0.70/.../..        25 SSW AERO 25 SSW RMY N/A TSTM 
8/9  86/70/78/+6/0.07/.../..        29 SW  AERO 28 SW  RMY N/A TSTM
8/10 85/66/76/+5/T/.../..           17 NW  AERO 16 NW  RMY N/A          
8/11 70/66/68/-3/..../.../..        18 SE  AERO 17 SE  RMY 18
8/12 73/66/70/-1/..../.../..        23 NNE AERO 18 NNE RMY 21
8/13 69/64/67/-4/0.17/.../..        23 ENE AERO 21 ENE RMY 21 
8/14 83/69/76/+5/0.00/.../..        25 S   AERO 23 S   RMY 24 
8/15 86/68/77/+6/0.00/.../..        20 W   AERO 17 W   RMY 19 
8/16 87/70/79/+8/0.00/.../..        20 W   AERO 18 W   RMY 20 
8/17 83/67/75/+4/..../.../..        23 SSW AERO 23 SSW RMY N/A
8/18 83/63/73/+2/..../.../..        31 NE  AERO 30 NE  RMY 33 TSTM 
8/19 68/62/65/-5/..../.../..        30 NE  AERO 30 NE  RMY 32
8/20 72/61/67/-3/0.00/.../..        28 ENE AERO 25 ENE RMY 27 

8/20 Low temp since midnight is 64F; normal low is now 62F

DAILY RECORDS FOR AUGUST 2018

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

08/07/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 73F, 
          BREAKS 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 21
HIGH 92F IN 1937, 1995
LOW 47F IN 1982
PRECIP 2.84 INCHES IN 1888
PEAK GUST 54 MPH WSW IN 2004

RECORDS FOR AUGUST 22
HIGH 90F IN 1939
LOW 42F IN 1894
PRECIP 2.28 INCHES IN 1935
PEAK GUST 44 MPH SSW IN 1987

TODAY'S REPORT PREPARED BY: Kaitlin Geagan