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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, SEPTEMBER 5, 2018 
ALL TIMES ARE IN EASTERN STANDARD TIME

ANOTHER WARMER THAN NORMAL DAY ON TOP OF GREAT
BLUE HILL...

Today was another hazy hot and humid day on top of
Great Blue Hill. So far by 1:00 P.M. we had a max
temperature of 87F. This is 12 degrees above the daily
normal high of 75F. We observed a record breaking high daily
low temperature yesterday of 70F, which is 2 degrees
warmer than the previous record of 68F set in 1937 and
1959. So far we have not had any precipitation in the 
month of September for below seasonable rainfall and above
seasonable temperatures. Visibility increased today from 
1/16th mile, caused by fog in the area, to 40 miles by 1:00 
P.M., but a distant haze lingered in the area throughout 
the day. 

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: 297 [+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: Fog
Temperature: 69F; Dew Point: 69F; Wind: S AT 5 kts
Wind: Light 
Sea-level pressure: 30.28 ins. Hg, steady then rising    
Visibility: 1/16 miles, fog
6-hr Max temp: 69F
6-hr Min temp: 67F
24-hr Precip: 0.00 ins.  
BHO SA 1155 W2 X 1/16F 255/69/69/1805/028/ WND LGT/ 8//// 53008 
10069 20067

10 A.M.
Weather: Clear, few cumulus SE-N, few cirrus in all directions 
Temperature: 80F; Dew Point: 69F; Wind: SSW at 8G13 kts,
Sea-level pressure: 30.27 ins. Hg, rising unsteadily 
Visibility: 20 miles, distant haze in all directions 
3-hr Precip: 0.00 ins. 
BHO SA 1455 CLR 250/80/69/2108G13/027/ FEW CU SE-N FEW CI 
ALQDS DSNT HZ ALQDS/ 8/101 56005

1 P.M.
Weather: Scattered cumulus, scattered cirrus
Temperature: 87F; Dew Point: 69F; Wind: SW at 9G16 kts,
Wind: Light 
Sea-level pressure: 30.22 ins. Hg, falling, then more slowly  
Visibility: 40 miles, distant haze in all directions 
6-hr Max temp: 87F
6-hr Min temp: 69F
6-hr Precip: 0.00 ins.
BHO SA 1755 37 SCT 250 SCT 233/87/69/2209G16/022/ DSNT 
HZ ALQDS/ 8/108 56017 10087 20069  

SUMMARY FOR TUESDAY, SEPTEMBER 4 2018 

TEMPERATURE (DEGREES F)
MAX.....88   NORMAL.....76
MIN.....70   NORMAL.....59
MEAN....79   NORMAL.....67

DEPARTURE FROM 30-YEAR NORMAL......................+12
TOTAL DEPARTURE FOR THE MONTH......................+28 [+6.8 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY..............14  DEPARTURE.........+10
TOTAL COOLING UNITS FOR THE MONTH..............38  DEPARTURE.........+23
TOTAL COOLING UNITS FOR THE SEASON............791  DEPARTURE........+239
TOTAL COOLING UNITS LAST SEASON TO DATE.......609  DEPARTURE........+182

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY.....................17 W   AT 1:25  A.M.
                   AERO..........................16 W   AT 2:09  A.M.
                   ASOS..........................17 W   AT 2:05  A.M.
                   DAVIS.........................17 M** AT 2:05  A.M. RMY 17
FASTEST MILE FOR YESTERDAY.......................13 W   AT 12:53 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE....................14 W   AT 2:03  A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE...................13 M** AT 12:54 A.M.
AVERAGE WIND SPEED AND DIRECTION...............8.5 SE
                   ASOS........................8.4
                   DAVIS.......................8.7 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......-0.46
                         ASOS..............0.00 
TOTAL PRECIPITATION FOR THE YEAR..........37.95  DEPARTURE......+2.65
                         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 Low temp since midnight is 67F; 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 5
HIGH 90F IN 1971
LOW 45F IN 1906
PRECIP 1.37 INCHES IN 1907
PEAK GUST 46 MPH NW IN 1994

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)

TODAY'S REPORT PREPARED BY: Samantha Richard/Kaitlin Geagan