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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, AUGUST 11, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME


COOLER THAN AVERAGE TEMPERATURES 
WITH EXCELLENT VISIBILITY AND 
INCREASING AFTERNOON CLOUDS….

We observed excellent visibly throughout the day, with 80 
miles on average being seen. Wind reduced before the 10 A.M 
observation and then became fairly gusty later in the 
afternoon. The peak gust so far today is 25 mph. Furthermore, 
Clouds cover increased in the afternoon as a broken cumulus 
layer was observed. Conditions continued to be dry, with 
temperatures being cool for late summer. The high so far today 
is 77F, 3 degrees below the daily normal maximum of 80F. 
The low since midnight is 56F, 7 degrees below the average 
daily minimum of 63F.   

PRELIMINARY STATS FOR JULY 2019

TEMPERATURE, Deg. F
Avg. Max. 84.6 [+3.8]
Avg. Min. 65.6 [+2.7]
Mean      75.1 [+3.2]
24-hour corrected mean: 74.5
Max. for month: 93F on the 20th, 30th
Min. for month: 58F on the 1st, 23rd

COOLING DEGREE DAYS
Total cooling units:   322 [+100]
Total for the season:  411 [+60]
Total for last season: 455

PRECIPITATION, Inches
Total: 5.45 [+1.43]
Greatest in 24 hrs: N/A 

WIND, mph
Avg. uncorrected wind speed: 8.8
Avg. corrected wind speed:   9.6
Prevailing wind direction: W at 14%
Peak gust and direction: 44 W on 17th  

SUNSHINE:
Campbell-Stokes card minutes: 18300 minutes of possible 26682 or 69%
Astronomical total minutes: 19049 minutes of possible 27759 or 69%

Today's Observations:

7 A.M.
Weather:Scattered cirrostratus
Temperature: 61F; Dew Point: 53F; Wind: WNW at 9 kts
Sea-level pressure: 29.96 ins. Hg, steady, then rising
Visibility: 80 miles
6-hr Max temp: 56F
6-hr Min temp: 61F
24-hr Precip: 0.00 ins.
BHO SA 1155 250 SCT 80 148/61/53/2909/996/ 8/005 53020 10061 20056

10 A.M.
Weather: Scattered cumulus
Temperature: 60F; Dew Point: 54F; Wind: WNW at 4 kts
Wind: Light
Sea-level pressure: 29.95 ins. Hg, rising, then falling
Visibility: 80 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 50 SCT 80 144/60/54/2904/995/ WND LGT/ 8/100 58004

1 P.M.
Weather: Broken cumulus
Temperature: 77F; Dew Point: 52F; Wind: WNW at 12G19 kts
Sea-level pressure: 29.94 ins. Hg, falling, then steady
Visibility: 80 miles
6-hr Max temp: 77F
6-hr Min temp: 61F
6-hr Precip: 0.00 ins. 
BHO SA 1755 60 BKN 80 142/77/52/2912G19/994/ 8/100 56002 10077 20061

SUMMARY FOR SATURDAY, AUGUST 10, 2019 

TEMPERATURE (DEGREES F)
MAX.....78   NORMAL.....80
MIN.....59   NORMAL.....63
MEAN....69   NORMAL.....71

DEPARTURE FROM 30-YEAR NORMAL......................-2
TOTAL DEPARTURE FOR THE MONTH.....................+11 [+0.9 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............4   DEPARTURE.........-4
TOTAL COOLING UNITS FOR THE MONTH..............80   DEPARTURE........+9
TOTAL COOLING UNITS FOR THE SEASON............491   DEPARTURE........+69
TOTAL COOLING UNITS LAST SEASON TO DATE.......596   DEPARTURE........-105

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................32 NW  AT  12:12 P.M.
                   AERO.........................28 NW  AT   9:41 A.M.
                   ASOS.........................31 W  AT  12:12 P.M.
                   DAVIS........................31 W  AT  12:12 P.M. RMY 28
FASTEST MILE FOR YESTERDAY......................22 NW  AT  12:08 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...................20 W  AT  12:40 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................21 W  AT  11:18 A.M.
AVERAGE WIND SPEED AND DIRECTION..............12.7 NW
                   ASOS.......................12.7
                   DAVIS......................13.2 W [283 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..........0.78  DEPARTURE......-0.61
                         ASOS..............0.81
TOTAL PRECIPITATION FOR THE YEAR..........36.10  DEPARTURE......+3.65
                         ASOS.............36.09

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

07/01 83/58/71/+1/0.00/896/98               21 NNW AERO 21 NNW RMY N/A
07/02 82/65/74/+4/0.00/329/36               23 W   AERO 23 W   RMY 23
07/03 89/67/78/+7/0.00/866/95               18 S   AERO 18 S   RMY 18
07/04 88/68/78/+7/0.00/748/82               17 SSW AERO M  M   RMY 17
07/05 87/69/78/+7/0.00/829/91               21 SW  AERO M  M   RMY 21
07/06 90/71/81/+10/0.83/646/71              26 WNW AERO M  M   RMY N/A TSTM
07/07 78/64/71/0/0.00/827/91                30 NE  AERO M  M   RMY N/A
07/08 79/59/69/-3/0.00/763/84               16 N   AERO 18 SSW RMY N/A
07/09 85/61/73/+1/0.00/871/96               18 NW  AERO 16 NW  RMY 18
07/10 88/69/79/+7/0.00/607/67               20 ESE AERO 16 ESE RMY 17
07/11 81/67/74/+2/0.62/000/00               35 S   AERO 33 S   RMY 36
07/12 84/68/76/+4/0.00/316/35               31 WNW AERO 30 WNW RMY 32
07/13 85/65/75/+3/0.00/812/90               21 W   AERO 20 WSW RMY 20
07/14 87/68/78/+6/0.00/702/78               25 W   AERO 21 W   RMY 23
07/15 82/63/73/+1/0.00/791/88               24 WNW AERO 23 WNW RMY 22
07/16 86/65/76/+4/0.00/682/76               23 W   AERO 21 W   RMY 21
07/17 90/70/80/+8/1.32/260/29               44 W   AERO M  M   RMY 47 TSTM
07/18 72/61/67/-5/0.04/000/00               33 NE  AERO 36 NE  RMY 33
07/19 89/61/75/+3/0.00/580/65               24 WSW AERO 26 SW  RMY 25
07/20 93/75/84/+12/0.00/802/90              21 WSW AERO 22 WSW RMY N/A
07/21 92/76/84/+12/0.00/729/82              31 W   AERO 35 W   RMY 31
07/22 81/64/73/+1/1.22/284/32               35 ENE AERO 37 ENE RMY 34
07/23 66/58/62/-10/0.86/009/01              30 NNE AERO 33 NNE RMY 30
07/24 77/60/69/-3/0.01/575/65               14 NE  AERO 15 NE  RMY N/A
07/25 80/61/71/-1/0.00/732/83               17 SSE AERO 23 N   RMY 17
07/26 84/62/73/+1/0.00/730/83               22 SSE AERO 23 SSE RMY 20
07/27 83/64/74/+2/0.00/834/95               21 S   AERO 23 S   RMY 21
07/28 89/64/77/+5/0.00/710/81               25 WSW AERO 36 WSW RMY 26
07/29 89/71/80/+8/0.01/804/92               23 W   AERO 25 W   RMY 21
07/30 93/71/82/+10/0.00/767/88              24 S   AERO 24 S   RMY 23
07/31 90/68/79/+7/0.55/548/63               37 SW  AERO 35 SW  RMY 38 TSTM

DAILY RECORDS FOR JULY 2019

7/20/19: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 75F,
BREAKS PREVIOUS RECORD OF 73F SET IN 1977, 2015

7/21/19: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 76F,
BREAKS PREVIOUS RECORD OF 75F SET IN 1991

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

8/01   84/66/75/3/0.00/.../..                18 NNW AERO 20 NW  RMY 17
8/02   83/61/72/0/0.00/.../..                18 WSW AERO 18 WSW RMY 18 
8/03   84/66/75/+3/0.00/.../..               25 SW  AERO 26 SW  RMY 25
8/04   83/66/75/+3/0.00/.../..               21 NE  AERO 23 SW  RMY 25
8/05   81/58/70/-2/0.00/.../..               20 S   AERO 18 S   RMY 19
8/06   79/63/71/-1/0.00/.../..               15 S   AERO 14 S   RMY 17
8/07   82/66/74/+2/..../.../..               32 SSW AERO 35 SSW RMY 35
8/08   84/67/76/+4/..../.../..               30 SW  AERO 24 WNW RMY 29
8/09   82/63/73/+1/..../.../..               28 NW  AERO 25 NW  RMY 26
8/10   78/59/69/-2/..../.../..               32 NW  AERO 28 NW  RMY 28

8/11 Low temp since midnight is 56F; normal low is 63F


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

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

RECORDS FOR AUGUST 12
HIGH 99F IN 1944
LOW 48F IN 1930
PRECIP 1.89 INCHES IN 1979
PEAK GUST 50 MPH NE IN 1983

TODAY'S REPORT PREPARED BY: Nicholas Rousseau