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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, SEPTEMBER 2, 2018 
ALL TIMES ARE IN EASTERN STANDARD TIME

SOUTHERLY WIND BRINGS SLIGHTLY WARMER AIR TO 
GREAT BLUE HILL TODAY...
A VERY WARM AUGUST FINISHES AS SECOND WARMEST ON RECORD...

Temperatures rose today to above normal due to a 
shift in wind direction from the north to south. 
So far today we reach a maximum high temperature
of 83F, which is 7 degrees above our daily normal
of 76F. Our visibility rose today from 20 miles
at our 7:00 observation to 40 miles at our 1:00
observation as humidity decreased from 73% to
45%. Pressure dropped, causing an increase in
cloud cover as the day progressed. On this day
in 1953, we experienced the highest temperature
ever observed in the month of September at Blue
Hill Observatory, with a max that day of 99F.

With a 24-hour adjusted mean temperature of 73.4 degrees F,
August was the second warmest on record. The average maximum
tied for the eighth warmest, and the average maximum temperature
of 66.3 deg F was the warmest on record by more than a degree F. 

BHO Warmest August 24-hour Adjusted Mean Temperature, 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


PRELIMINARY STATS FOR AUGUST 2018
 
TEMPERATURE, Deg. F
Avg. Max. 82.4 [+3.2]
Avg. Min. 66.3 [+4.6]
Mean      74.4 [+4.0]
24-hour corrected mean: 73.4
Max. for month: 94F on 29th
Min. for month: 58F on 31st
 
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: 1.16 on the 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: N/A
Astronomical total minutes: N/A

Today's Observations:

7 A.M.
Weather: Few altocumulus N-NNE, few cirrostratus in
all directions
Temperature: 66F; Dew Point: 61F; Wind: SW @04 kts,
Wind: Light 
Sea-level pressure: 30.29 ins. Hg, rising, then more rapidly     
Visibility: 20 miles, distant haze in all directions 
6-hr Max temp: 66F
6-hr Min temp: 61F
24-hr Precip: 0.00 ins.  
BHO SA 1155 CLR 20 257/66/61/2205/029/ FEW AC N-NNE FEW CS 
ALQDS DSNT HZ ALQDS WND LGT/ 8/038 51010 10066 20061

10 A.M.
Weather: Scattered altocumulus, scattered cirrostratus
Temperature: 75F; Dew Point: 55F; Wind: S at 06G11 kts,
Wind: Light
Sea-level pressure: 30.29 ins. Hg, rising then falling
Visibility: 40 miles, distant haze in all directions 
3-hr Precip: 0.00 ins. 
BHO SA 1455 60 SCT 300 SCT 40 259/75/55/1806G11/029/DSNT
HZ ALQDS WND LGT/ 8/038 58002

1 P.M.
Weather: Broken cirrus, few stratocumulus WSW-NW, few 
altocumulus standing lenticular NW-N
Temperature: 81F; Dew Point: 58F; Wind: S at 07G13 kts
Sea-level pressure: 30.29 ins. Hg, falling then rising    
Visibility: 40 miles, distant haze in all directions 
6-hr Max temp: 83F
6-hr Min temp: 66F
6-hr Precip: 0.00 ins.
BHO SA 1755 250 BKN 40 241/81/58/1907G13/029/ FEW DSNT 
SC WSW-NW FEW ACSL NW-N DSNT HZ ALQDS/ 8/448 56018 10083 
20066

SUMMARY FOR SATURDAY, SEPTEMBER 1, 2018 

TEMPERATURE (DEGREES F)
MAX.....75   NORMAL.....76
MIN.....58   NORMAL.....59
MEAN....67   NORMAL.....68

DEPARTURE FROM 30-YEAR NORMAL.......................-1
TOTAL DEPARTURE FOR THE MONTH.......................-1 [-1.2 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............2  DEPARTURE..........-2
TOTAL COOLING UNITS FOR THE MONTH...............2  DEPARTURE..........-2
TOTAL COOLING UNITS FOR THE SEASON............755  DEPARTURE........+214
TOTAL COOLING UNITS LAST SEASON TO DATE.......607  DEPARTURE........+148

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY.....................17 NE  AT 1:33 P.M.
                   AERO..........................15 NE  AT 1:34 P.M.
                   ASOS..........................17 ENE AT 2:44 P.M.
                   DAVIS.........................17 NE  AT 1:33 P.M. RMY 16 
FASTEST MILE FOR YESTERDAY.......................12 NE  AT 1:30 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE....................13 E   AT 3:49 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE...................13 NE  AT 1:34 P.M.
AVERAGE WIND SPEED AND DIRECTION................7.2 NE
                   ASOS.........................7.8
                   DAVIS........................7.4 ENE [78 DEG]
* LAST OF MULTIPLE OCCURRENCES

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.11
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........0.00  DEPARTURE......-0.11
                         ASOS..............0.00 
TOTAL PRECIPITATION FOR THE YEAR..........37.95  DEPARTURE......+3.00
                         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/.../..       25 SW  AERO 24 SW  RMY 27 
8/30 88/67/78/+10/0.00/.../..       23 ENE AERO 21 ENE RMY N/A
8/31 72/60/66/-3/0.00/.../..        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/.../..        

9/2 Low temp since midnight is 61F; normal low is now 59F

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

RECORDS FOR SEPTEMBER 2
HIGH 99F IN 1953 (SEPTEMBER MAXIMUM RECORD)
LOW 44F IN 1909
PRECIP 2.73 INCHES IN 1947
PEAK GUST 55e MPH WNW IN 1944

RECORDS FOR SEPTEMBER 3
HIGH 95F IN 1929
LOW 43F IN 1983
PRECIP 3.82 INCHES IN 1972 (TROPICAL STORM CARRIE)
PEAK GUST 58 MPH NNE IN 1972 (TROPICAL STORM CARRIE)

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