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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, SEPTEMBER 6, 2018 
ALL TIMES ARE IN EASTERN STANDARD TIME

HAZY, HOT, AND HUMID DAY WITH ALREADY RECORD-TYING 
HIGH TEMPERATURES...

The high maximum temperature so far today by 1:00 P.M is 
a record-tying daily high maximum temperature of 92F. The 
previous daily high maximum record of 92F was originally 
set back in 1900. 92F is 17 degrees above the daily normal
temperature of 75F. The overnight low temperature since 
midnight of 70F is close to record breaking as well, being 
1 degree below the daily high record minimum temperature of 
71F set in 1983. Yesterday the high maximum temperature of 
89F was also 1 degree below the record of 90F, originally 
set in  1971. The wind has been breezy and from the SW/WSW 
today with frequent gust over 17 kts (20 MPH). Visibility was 
limited to 15 miles at 7:00 A.M. due to morning fog. It then
increased to 45 miles by 10:00 A.M. and finally decreased down 
to 30 miles at 1:00 P.M. due to a distant lingering haze in 
the area. Day began with overcast stratus in the morning which 
quickly broke up after sunrise and we had clear skies at the 
10:00 A.M. observation then scattered cumulus and cirrus at 
the 1:00 P.M. observation.   

PRELIMINARY STATS FOR AUGUST 2018
 
TEMPERATURE, Deg. F
Avg. Max. 82.4 [+3.2]
Avg. Min. 66.4 [+4.6]
Mean      74.4 [+3.9]
24-hour corrected mean: 73.4
Max. for month: 94F on 29th
Min. for month: 59F on 24th, 25th, and 26th
 
COOLING DEGREE DAYS
Total heating units:   298 [+112] 
Total for the season:  753 [+216]
Total for last season: 607

PRECIPITATION, Inches
Total: 3.94 [-0.09]
Greatest in 24 hrs: 1.31 on the 3rd-4th 

WIND, mph
Avg. uncorrected wind speed: 9.6
Avg. corrected wind speed:   10.2
Prevailing wind direction:   SW at 13%
Peak gust and direction: 35 NW on 3rd
35 WNW on 22nd

SUNSHINE:
Campbell-Stokes card minutes: 14304 minutes of possible 24780 or 58%
Astronomical total minutes:   14856 minutes of possible 25749 or 58%

BHO Warmest August Mean Temperature (24-hour adjusted), deg F (1885-2018):

1) 74.1 in 2016
2) 73.4 in 2018
3) 72.6 in 2012
4) 72.5 in 1988
5) 72.4 in 2015

BHO Warmest August Average Maximum Temperature, deg F (1885-2018):

1) 85.1 in 2016
2) 83.2 in 2005
3) 83.1 in 1949
4) 82.6 in 2015
5) 82,5 in 1988
   82.5 in 2002
   82.5 in 2012
8) 82.4 in 1944
   82.4 in 2018

BHO Warmest August Average Minimum Temperature, deg F (1885-2018):

1) 66.3 in 2018
2) 65.0 in 2016
3) 64.9 in 2001
4) 64.6 in 2012
5) 64.4 in 2005
   64.4 in 2015



Today's Observations:

7 A.M.
Weather: Broken stratus 
Temperature: 74F; Dew Point: 71F; Wind: SW AT 11G18 kts
Sea-level pressure: 30.12 ins. Hg, falling, then more rapidly    
Visibility: 15 miles
6-hr Max temp: 74F
6-hr Min temp: 70F
24-hr Precip: 0.00 ins.  
BHO SA 1155 E10 BKN 15 200/74/71/2211G18/012/ SUN DMLY 
VSBL DSNT FG ALQDS/ 8/600 58001 10074 20070 

10 A.M.
Weather: Clear, few cumulus/towering cumulus SSW-NNW, 
few lower cirrus WSW-NW
Temperature: 85F; Dew Point: 73F; Wind: WSW at 10G17 kts
Sea-level pressure: 30.11 ins. Hg, steady then falling 
Visibility: 45 miles, distant haze in all directions 
3-hr Precip: 0.00 ins. 
BHO SA 1455 CLR 45 196/85/73/2410G17/011/ FEW CU/TCU SSW-NNW 
FEW LWR CI WSW-NW DSNT HZ ALQDS/ 8/201 58004 

1 P.M.
Weather: Scattered cumulus, scattered cirrus, patches of
cirrocumulus NNW-NNE
Temperature: 90F; Dew Point: 71F; Wind: WSW at 9G17 kts
Sea-level pressure: 30.06 ins. Hg, falling, then more rapidly   
Visibility: 30 miles, distant haze in all directions 
6-hr Max temp: 92F
6-hr Min temp: 73F
6-hr Precip: 0.00 ins.
BHO SA 1755 40 SCT 250 SCT 30 178/90/71/2509G17/006/ 
PTCHS CC NNW-NNE DSNT FG ALQDS/ 8/102 10092 20073  

SUMMARY FOR WEDNESDAY, SEPTEMBER 5, 2018 

TEMPERATURE (DEGREES F)
MAX.....89   NORMAL.....75
MIN.....67   NORMAL.....59
MEAN....78   NORMAL.....67

DEPARTURE FROM 30-YEAR NORMAL......................+11
TOTAL DEPARTURE FOR THE MONTH......................+39 [+7.6 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY..............13  DEPARTURE.........+11
TOTAL COOLING UNITS FOR THE MONTH..............51  DEPARTURE.........+23
TOTAL COOLING UNITS FOR THE SEASON............804  DEPARTURE........+239
TOTAL COOLING UNITS LAST SEASON TO DATE.......617  DEPARTURE........+182

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY.....................23 SSW AT 9:43 P.M.
                   AERO..........................23 SSW AT 9:43 P.M.
                   ASOS..........................26 S   AT 9:43 P.M.
                   DAVIS.........................27 M** AT 9:45 P.M. RMY 25
FASTEST MILE FOR YESTERDAY.......................17 SSW AT 9:43 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE....................17 S   AT 9:47 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE...................18 M** AT 9:46 P.M.
AVERAGE WIND SPEED AND DIRECTION...............10.2 SSW
                   ASOS........................10.8
                   DAVIS.......................10.5 M**
** DAVIS READING HIGH AND DIRECTIONS MALFUNCTIONING  

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.12
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........0.00  DEPARTURE......-0.58
                         ASOS..............0.00 
TOTAL PRECIPITATION FOR THE YEAR..........37.95  DEPARTURE......+2.53
                         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/+5/0.00/651/77        17 NW  AERO 16 NW  RMY N/A      
8/11 70/66/68/-3/0.34/000/00        18 SE  AERO 17 SE  RMY 18
8/12 73/66/70/-1/0.39/000/00        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/+8/0.00/515/62        20 W   AERO 18 W   RMY 20 
8/17 83/67/75/+4/0.00/531/64        23 SSW AERO 23 SSW RMY N/A
8/18 83/63/73/+2/0.50/165/20        31 NE  AERO 30 NE  RMY 33 TSTM 
8/19 68/62/65/-5/0.03/527/64        30 NE  AERO 30 NE  RMY 32
8/20 72/61/67/-3/0.00/591/72        28 ENE AERO 25 ENE RMY 27 
8/21 69/61/65/-5/T/155/19           20 ESE AERO 17 ESE RMY N/A 
8/22 82/62/72/+2/0.38/326/40        35 WNW AERO 35 WNW RMY 35 
8/23 76/60/68/-2/0.01/187/23        25 NW  AERO 23 NW  RMY 27
8/24 82/59/71/+1/0.00/754/93        20 SSE AERO 18 SSE RMY 20
8/25 80/59/70/+1/0.00/735/91        20 S   AERO 18 S   RMY 20
8/26 81/59/70/+1/0.00/716/89        21 SSW AERO 20 SSW RMY 21
8/27 86/67/77/+8/0.00/706/88        21 WNW AERO 18 WNW RMY 18
8/28 93/72/83/+14/0.00/672/84       25 WSW AERO 25 WSW RMY 28
8/29 94/75/85/+16/0.00/399/50       25 SW  AERO 24 SW  RMY 27 
8/30 88/67/78/+10/0.00/564/71       23 ENE AERO 21 ENE RMY N/A
8/31 72/60/66/-3/0.00/610/77        24 ENE AERO 23 ENE RMY N/A

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

08/29/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 75F, 
          BREAKS PREVIOUS RECORD OF 74F SET IN 1948

PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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

9/1 75/58/67/-1/0.00/.../..        17 NE  AERO 15 NE  RMY 16        
9/2 83/61/72/+4/0.00/.../..        20 SSW AERO 18 SSW RMY N/A 
9/3 92/68/80/+13/0.00/.../..       24 WSW AERO 22 WSW RMY 25
9/4 88/70/79/+12/0.00/.../..       17 W   AERO 16 W   RMY 17 
9/5 89/67/78/+11/0.00/.../..       23 SSW AERO 23 SSW RMY 25 

9/6 Low temp since midnight is 70F; normal low is now 58F

DAILY RECORDS FOR SEPTEMBER

09/04/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 70F,
          BREAKS PREVIOUS RECORD OF 68F SET IN 1937 AND
  1959

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

RECORDS FOR SEPTEMBER 6
HIGH 92F IN 1900
LOW 39F IN 1888
PRECIP 3.19 INCHES IN 1890
PEAK GUST 78e MPH SE IN 1979 (TROPICAL STORM DAVID)

RECORDS FOR SEPTEMBER 7
HIGH 92F IN 2007, 2015
LOW 40F IN 1888
PRECIP 2.95 INCHES IN 1891
PEAK GUST 58e MPH W IN 1941

TODAY'S REPORT PREPARED BY: Kaitlin Geagan