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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, AUGUST 23, 2018 
ALL TIMES ARE IN EASTERN STANDARD TIME

NORTHWESTERLY WIND BRINGS COOLER TEMPERATURES TO GREAT 
BLUE HILL...

Rain began again yesterday afternoon and we measured 
0.09 ins. this morning with about 0.01 ins. falling
so far today. Today temperatures were cooler than
yesterday with a max so far of 73F by 1:00 P.M. This
is 5 degrees above the daily normal of 78F. Since
midnight the low temperature of 60F is 1 degrees 
below the daily normal of 61F. Wind from the WNW was
moderate today with a couple gusts of 28 MPH. The
sky cleared throughout the day and as the humidity
dropped, visibility increased from 45 to 70 miles
by 1:00 P.M. Dew points were very comfortable this  
afternoon at 51F and a low humidity of around 46%. 

Today's Observations:

7 A.M.
Weather: Scattered altocumulus, broken altostratus 
Temperature: 62F; Dew Point: 53F; Wind: NW at 12G18 kts
Sea-level pressure: 29.87 ins. Hg, rising unsteadily  
Visibility: 45 miles, distant haze in all directions
6-hr Max temp: 64F
6-hr Min temp: 60F
24-hr Precip: 0.09 ins.  
BHO SA 1155 76 SCT E100 BKN 45 116/62/53/3312G18/987/ 
DSNT HZ ALQDS/ 8/070 52015 MANUAL 70009 ASOS 70020 10064 20060

10 A.M.
Weather: Scattered altocumulus, broken altostratus, moderate
stratocumulus with cumuliform tops SSE-SSW and NNE-E
Temperature: 67F; Dew Point: 53F; Wind: NW at 9G16 kts
Sea-level pressure: 29.92 ins. Hg, rising unsteadily
Visibility: 60 miles, distant haze in all directions
3-hr Precip: 0.00 ins. 
BHO SA 1455 76 SCT E100 BKN 60 133/67/53/3109G16/992/ FEW SC 
MDT CUFRM TOPS SSE-SSW AND NNE-E DSNT HZ ALQDS/ 8/870 51017

1 P.M.
Weather: Scattered stratocumulus, scattered altocumulus, 
broken altostratus, few cumulus in all directions  
Temperature: 73F; Dew Point: 51F; Wind: NW at 9G16 kts
Sea-level pressure: 29.93 ins. Hg, rising then steady  
Visibility: 70 miles
6-hr Max temp: 73F
6-hr Min temp: 61F
6-hr Precip: 0.00 ins. 
BHO SA 1755 30 SCT 76 SCT 200 SCT 70 136/73/51/3209G16/993/ 
FEW CU ALQDS/ 8/833 50003 10073 20061

SUMMARY FOR WEDNESDAY, AUGUST 22, 2018 

TEMPERATURE (DEGREES F)
MAX.....82   NORMAL.....79
MIN.....62   NORMAL.....61
MEAN....72   NORMAL.....70

DEPARTURE FROM 30-YEAR NORMAL.........................+2
TOTAL DEPARTURE FOR THE MONTH........................+77 [+3.3 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............7  DEPARTURE..........+2
TOTAL COOLING UNITS FOR THE MONTH.............215  DEPARTURE.........+71
TOTAL COOLING UNITS FOR THE SEASON............670  DEPARTURE........+175
TOTAL COOLING UNITS LAST SEASON TO DATE.......590  DEPARTURE.........+80

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY.....................35 WNW AT 3:13 P.M.
                   AERO..........................35 WNW AT 3:13 P.M.
                   ASOS..........................35 WNW AT 3:16 P.M.
                   DAVIS.........................33 M   AT 3:13 P.M. RMY 35 
FASTEST MILE FOR YESTERDAY.......................26 WNW AT 3:15 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE....................26 WNW AT 3:15 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE...................26 M   AT 3:15 P.M.
AVERAGE WIND SPEED AND DIRECTION...............10.0 WNW
                   ASOS........................10.1
                   DAVIS........................9.9 M
* LAST OF MULTIPLE

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.09  DEPARTURE......-0.03
                         ASOS..............0.20
TOTAL PRECIPITATION FOR THE MONTH..........3.95  DEPARTURE......+0.95
                         ASOS..............3.94 
TOTAL PRECIPITATION FOR THE YEAR..........37.96  DEPARTURE......+4.15
                         ASOS.............39.52

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/+8/0.70/460/54        25 SSW AERO 25 SSW RMY N/A TSTM 
8/9  86/70/78/+6/0.07/509/60        29 SW  AERO 28 SW  RMY N/A TSTM
8/10 85/66/76/+5/T/651/77           17 NW  AERO 16 NW  RMY N/A          
8/11 70/66/68/-3/..../000/00        18 SE  AERO 17 SE  RMY 18
8/12 73/66/70/-1/..../000/00        23 NNE AERO 18 NNE RMY 21
8/13 69/64/67/-4/0.17/000/00        23 ENE AERO 21 ENE RMY 21 
8/14 83/69/76/+5/0.00/502/60        25 S   AERO 23 S   RMY 24 
8/15 86/68/77/+6/0.00/509/61        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 
8/21 69/61/65/-5/T/.../..           20 ESE AERO 17 ESE RMY N/A 
8/22 82/62/72/+2/..../.../..        35 WNW AERO 35 WNW RMY 35 

8/23 Low temp since midnight is 60F; normal low is now 61F

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 23
HIGH 88F IN 1918, 1947, 1949, 1996
LOW 45F IN 1923
PRECIP 2.09 INCHES IN 2010
PEAK GUST 60e MPH NW IN 1940

RECORDS FOR AUGUST 24
HIGH 92F IN 1947
LOW 43F IN 1971
PRECIP 2.40 INCHES IN 2010 
PEAK GUST 54 MPH W IN 1986

TODAY'S REPORT PREPARED BY: Kaitlin Geagan