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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, AUGUST 5, 2018 
ALL TIMES ARE IN EASTERN STANDARD TIME

FAIR WEATHER AND LIGHT WINDS FOLLOWING 
YESTERDAY'S RAIN....

We observed clear skies this morning, and scattered cumulus
clouds at 1 P.M. Winds have remained light all day, with an
average wind speed under 10 mph. The rain total for yesterday
was 1.16 inches. The high temperature so far today is 87F, 6
degrees above the normal of 81F. The low since midnight was
66F, 3 degrees above the daily normal minimum of 63F.  

PRELIMINARY STATS FOR JULY 2018

TEMPERATURE, Deg. F
Avg. Max. 83.9 [+3.1]
Avg. Min. 63.7 [+0.8]
Mean      73.8 [+1.9]
24-hour corrected mean: 73.6
Max. for month: 94F on  1st and 3rd
Min. for month: 54F on  7th

COOLING DEGREE DAYS
Total cooling units:   296 [+74]
Total for the season:  455 [+104]
Total for last season: 421

PRECIPITATION, Inches
Total: 3.84 [-0.18]
Greatest in 24 hrs: 1.36 in on 17th-18th

WIND, mph
Avg. uncorrected wind speed: 9.8
Avg. corrected wind speed: 10.4
Prevailing wind direction: S at 19%
Peak gust and direction: 41 SSW on 26th  

SUNSHINE:
Campbell-Stokes card minutes: 18642 minutes of possible 26682 or 70%
Astronomical total minutes: 19402 minutes of possible 27744 or 70%

BHO Warmest July Mean Temperature (24-hr corrected mean), 
deg F (1885-2018):

1)  75.1 in 2010
2)  74.9 in 1952
3)  74.1 in 1994
    74.1 in 2013
5)  74.0 in 2011
    74.0 in 2016
7)  73.8 in 1999
8)  73.6 in 2018
9)  73.5 in 1949
10) 73.2 in 2012

Today's Observations:

7 A.M.
Weather: Clear, few distant cumulus NNW-SSE 
Temperature: 71F; Dew Point: 68F; Wind: WNW at 4 kts,
Wind: Light
Sea-level pressure: 30.14 ins. Hg, rising, then more slowly
Visibility: 70 miles 
6-hr Max temp: 71F
6-hr Min temp: 66F
24-hr Precip: 1.16 ins.  
BHO SA 1155 CLR 70 208/71/68/3004/014/ FEW DSNT CU NNW-SSE WND 
LGT/ 8/100 51014 MANUAL 70116 ASOS 70120 10071 20066

10 A.M.
Weather: Clear, few distant cumulus SE-SW
Temperature: 81F; Dew Point: 68F; Wind: WNW at 6 kts,
Wind: Light
Sea-level pressure: 30.15 ins. Hg, rising steadily 
Visibility: 70 miles
3-hr Precip: 0.00 ins.  
BHO SA 1455 CLR 70 210/81/68/3006/015/ FEW DSNT CU SE-SW WND LGT/ 
8/100 51002    

1 P.M.
Weather: Scattered cumulus  
Temperature: 87F; Dew Point: 67F; Wind: W at 4 kts,
Wind: Light
Sea-level pressure: 30.12 ins. Hg, falling steadily 
Visibility: 70 miles 
6-hr Max temp: 87F
6-hr Min temp: 71F
6-hr precip: 0.00 ins.
BHO SA 1755 40 SCT 70 200/87/67/2804/012/ WND LGT/ 8/200 56010 
10087 20071 

SUMMARY FOR SATURDAY, AUGUST 4, 2018 

TEMPERATURE (DEGREES F)
MAX.....82   NORMAL.....81
MIN.....69   NORMAL.....63
MEAN....76   NORMAL.....72

DEPARTURE FROM 30-YEAR NORMAL.........................+4
TOTAL DEPARTURE FOR THE MONTH........................+26 [+6.3 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY..............11   DEPARTURE..........+4
TOTAL COOLING UNITS FOR THE MONTH..............54   DEPARTURE.........+25
TOTAL COOLING UNITS FOR THE SEASON............509   DEPARTURE........+125
TOTAL COOLING UNITS LAST SEASON TO DATE.......462   DEPARTURE.........+47

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY.....................28 SW  AT 11:49 A.M.
                   AERO..........................25 SW  AT 11:51 A.M. 
                   ASOS..........................29 S   AT 11:51 A.M.
                   DAVIS.........................32 N   AT 11:50 A.M. RMY 30
FASTEST MILE FOR YESTERDAY.......................24 SW  AT 11:51 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE....................22 SSW AT 11:51 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE...................23 N   AT 11:51 A.M.
AVERAGE WIND SPEED AND DIRECTION...............10.7 S
                   ASOS........................11.0
                   DAVIS.......................11.0 N   [360 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....1.16  DEPARTURE......+1.01
                         ASOS..............1.20
TOTAL PRECIPITATION FOR THE MONTH..........1.35  DEPARTURE......+0.75
                         ASOS..............1.39 
TOTAL PRECIPITATION FOR THE YEAR..........35.36  DEPARTURE......+3.95
                         ASOS.............36.97

PRELIMINARY CLIMATE SUMMARY FOR JULY-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

7/01 94/72/83/+13/0.00/667/73       21 ESE AERO 18 ESE RMY 19 
7/02 90/68/79/+9/0.00/858/94        21 S   AERO 21 S   RMY 22
7/03 94/69/82/+11/0.00/657/72       20 SSW AERO 18 SW  RMY 19 TSTM
7/04 89/73/81/+10/0.00/884/97       17 NE  AERO 15 NE  RMY 16
7/05 91/73/82/+11/0.00/865/95       29 SSW AERO 28 SSW RMY N/A
7/06 80/59/70/-1/0.56/018/02        37 NNW AERO 38 SW  RMY 40 TSTM
7/07 78/54/66/-5/0.00/900/99        22 N   AERO 18 N   RMY N/A 
7/08 83/57/70/-2/0.00/890/98        23 S   AERO 21 S   RMY 22  
7/09 88/60/74/+2/0.00/852/94        23 SW  AERO 23 SW  RMY 24 
7/10 91/63/77/+5/0.10/751/83        24 W   AERO 22 W   RMY N/A
7/11 73/62/68/-4/0.63/705/78        28 NE  AERO 25 NE  RMY 27 TSTM
7/12 77/56/67/-5/0.00/867/96        16 NW  AERO 15 NW  RMY N/A 
7/13 84/61/73/+1/0.00/568/63        23 SSE AERO 23 SSE RMY 24
7/14 80/61/71/-1/0.00/540/60        18 S   AERO 16 S   RMY 19
7/15 84/65/75/+3/T/521/58           16 S   AERO 15 S   RMY 14 
7/16 83/67/75/+3/0.00/682/76        23 S   AERO 23 S   RMY 23 
7/17 88/67/78/+6/1.34/430/48        31 SW  AERO 30 SW  RMY 32 TSTM 
7/18 81/63/72/0/0.02/769/86         21 NW  AERO 22 NW  RMY 23 
7/19 80/56/68/-4/0.00/874/98        21 S   AERO 17 SSE RMY 19 
7/20 83/62/73/1/0.00/864/97         21 SE  AERO 17 ESE RMY 19
7/21 76/59/68/-4/0.00/738/83        23 ENE AERO 20 ENE RMY N/A
7/22 76/63/69/-3/0.29/009/01        29 ESE AERO 28 ESE RMY N/A
7/23 82/71/77/+5/0.09/327/37        32 S   AERO 30 S   RMY 32 
7/24 85/72/79/+7/T/698/79           31 S   AERO 29 S   RMY 29 
7/25 82/71/77/+5/..../159/18        35 SSE AERO 32 SSE RMY N/A 
7/26 83/69/76/+5/..../158/18        41 SSW AERO 39 SSW RMY N/A TSTM
7/27 88/69/79/+7/..../605/69        25 S   AERO 23 SSW RMY 26
7/28 87/71/79/+7/0.00/569/65        28 S   AERO 26 S   RMY 29
7/29 82/67/75/+3/0.00/768/88        18 W   AERO 16 W   RMY 18
7/30 82/64/73/+1/0.00/470/54        18 W   AERO 16 W   RMY 17
7/31 86/63/75/+3/0.00/739/85        16 SSW AERO 15 W   RMY N/A

DAILY RECORDS FOR JULY 2018

07/01/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 72F, 
          TIES PREVIOUS RECORD OF 72F SET IN 1968

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 
8/4  82/69/76/+4/1.16/.../..        28 SW  AERO 25 SW  RMY 30

8/5 Low temp since midnight is 66F; normal low is now 63F

DAILY RECORDS FOR AUGUST 2018

08/04/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 74F, 
          BREAK PREVIOUS RECORD OF 71F SET IN 1928, 1969, AND 1979

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

RECORDS FOR AUGUST 5
HIGH 98F IN 1955
LOW 48F IN 1929,1972
PRECIP 3.03 INCHES IN 1893
PEAK GUST 60e MPH SW 1977

RECORDS FOR AUGUST 6
HIGH 95F IN 1931
LOW 48F IN 1934
PRECIP 1.47 INCHES IN 1995
PEAK GUST 44e MPH SSW IN 1940

TODAY'S REPORT PREPARED BY: Benjamin Turner