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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, OCTOBER 5, 2018 
ALL TIMES ARE IN EASTERN STANDARD TIME

GREAT VISIBILITY AND DRY CONDITIONS WITH A COOL
NORTHEASTERLY BREEZE.... 

We observed 80 miles of visibility with a humidity around 60%
for most of the day. Winds persisted from the northeast, 
with frequent 20 mph gusts between 7 A.M. and 11 A.M. Temperatures
increased to 57F so far today, 7 degrees below the daily normal
of 64F. The low since midnight is 53F, 6 degrees above the normal
minimum of 47F.
 

PRELIMINARY STATS FOR SEPTEMBER 2018

TEMPERATURE, Deg. F
Avg. Max. 72.5 [+0.9]
Avg. Min. 58.6 [+4.0]
Mean 65.6 [+2.5]
24-hour corrected mean: 65.6
Max. for month: 92F on 3rd and 6th
Min. for month: 47F on 23rd

HEATING DEGREE DAYS
Total heating units: 87 [-30]
Total for the season: 87 [-55]
Total for last season: 93

COOLING DEGREE DAYS
Total cooling units: 110 [+50]
Total for the season: 863 [+266]
Total for last season: 707

PRECIPITATION, Inches
Total: 9.13 [+5.07]
Greatest in 24 hrs: 3.32 ins. on the 18th-19th

WIND, mph
Avg. uncorrected wind speed: N/A
Avg. corrected wind speed: N/A
Prevailing wind direction: N/A
Peak gust and direction: N/A

SUNSHINE:
Campbell-Stokes card minutes: N/A
Astronomical total minutes: N/A

BHO Wettest Septembers, inches (1886-2018):
1) 12.37 in 1999
2) 11.04 in 1933
3) 10.23 in 1896
4) 10.00 in 1961
5) 9.62 in 1987
6) 9.58 in 1888
7) 9.36 in 1918
8) 9.13 in 2018
9) 8.81 in 1907
10) 8.78 in 1996      

Today's Observations:

7 A.M.
Weather: Scattered stratocumulus 
Temperature: 54F; Dew Point: 49F; Wind: NE at 6G13 kts
Sea-level pressure: 30.17 ins. Hg, rising steadily       
Visibility: 80 miles
6-hr Max temp: 63F
6-hr Min temp: 53F
24-hr Precip: 0.00 ins.   
BHO SA 1155 50 SCT 80 216/54/49/0406G13/017/ 8/400 51035 
10063 20053 

10 A.M.
Weather: Scattered cumulus
Temperature: 55F; Dew Point: 45F; Wind: ENE at 12G20 kts  
Sea-level pressure: 30.22 ins. Hg, rising steadily
Visibility: 80 miles 
3-hr Precip: 0.00 ins.
BHO SA 1455 50 SCT 80 233/55/45/0612G20/022/ 8/100 51017 

1 P.M.
Weather: Scattered cumulus, scattered cirrus
Temperature: 57F; Dew Point: 44F; Wind: ENE at 9G17 kts
Sea-level pressure: 30.25 ins. Hg, falling steadily     
Visibility: 80 miles 
6-hr Max temp: 57F
6-hr Min temp: 53F 
6-hr Precip: 0.00 ins.
BHO SA 1755 30 SCT 250 SCT 80 224/57/44/0609G17/025/ 8/101 
58009 10057 20053
  
SUMMARY FOR THURSDAY, OCTOBER 4, 2018 

TEMPERATURE (DEGREES F)
MAX.....69   NORMAL.....65
MIN.....57   NORMAL.....47
MEAN....63   NORMAL.....56

DEPARTURE FROM 30-YEAR NORMAL.......................+7
TOTAL DEPARTURE FOR THE MONTH......................+11 [+2.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............2   DEPARTURE.........-7
TOTAL HEATING UNITS FOR THE MONTH..............23   DEPARTURE.........-5
TOTAL HEATING UNITS FOR THE SEASON............110   DEPARTURE........-68
TOTAL HEATING UNITS LAST SEASON TO DATE.......121   DIFFERENCE.......-11

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............0  DEPARTURE..........-1
TOTAL COOLING UNITS FOR THE MONTH...............0  DEPARTURE..........-1
TOTAL COOLING UNITS FOR THE SEASON............863  DEPARTURE........+266
TOTAL COOLING UNITS LAST SEASON TO DATE.......707  DIFFERENCE.......+156

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................29 SSW AT 1:58  P.M.
                   AERO.........................29 SSW AT 2:08  P.M.
                   ASOS.........................31 SSW AT 1:58  P.M.
                   DAVIS........................32 SW  AT 1:58  P.M. RMY 32
FASTEST MILE FOR YESTERDAY......................24 SSW AT 2:08  P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...................22 SSW AT 1:58  P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................22 SSW AT 1:59  P.M.
AVERAGE WIND SPEED AND DIRECTION...............11.3 SSW
                   ASOS........................11.8
                   DAVIS.......................10.9 SW [216 deg.]   

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.15
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........1.32  DEPARTURE......+0.72
                         ASOS..............1.34 
TOTAL PRECIPITATION FOR THE YEAR..........48.40  DEPARTURE......+8.90
                         ASOS.............50.26 

PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 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

9/01 75/58/67/-1/0.00/521/66        17 NE  AERO 15 NE  RMY 16 
9/02 83/61/72/+4/0.00/684/87        20 SSW AERO 18 SSW RMY N/A 
9/03 92/68/80/+13/0.00/650/83       24 WSW AERO 22 WSW RMY 25
9/04 88/70/79/+12/0.00/695/89       17 W   AERO 16 W   RMY 17 
9/05 89/67/78/+11/0.00/638/82       23 SSW AERO 23 SSW RMY 25 
9/06 92/70/81/+14/0.56/488/63       29 NNW AERO 29 NNW RMY N/A TSTM
9/07 70/63/67/+1/0.01/000/00        24 NE  AERO 22 NE  RMY N/A 
9/08 68/54/61/-5/0.00/031/04        22 NE  AERO 18 NE  RMY 21
9/09 61/53/57/-9/0.00/000/00        23 NE  AERO 21 NE  RMY N/A
9/10 62/56/59/-6/..../000/00        30 E   AERO 28 E   RMY 28
9/11 75/61/68/+3/..../000/00        23 E   AERO 21 E   RMY N/A TSTM 
9/12 69/63/66/+1/..../000/00        21 ENE AERO 21 ENE RMY 21  TSTM 
9/13 68/62/65/+1/..../091/12        21 NE  AERO 21 NE  RMY N/A TSTM 
9/14 75/61/68/+4/..../233/31        13 NE  AERO 12 ENE RMY 12 
9/15 76/62/69/+5/0.01/218/29        14 SW  AERO 13 SW  RMY 13
9/16 84/61/73/+10/..../695/93       15 S   AERO 14 S   RMY N/A
9/17 82/64/73/+10/..../372/50       22 SSW AERO 22 SSW RMY N/A
9/18 74/67/71/+9/..../000/00        31 SSW AERO 30 SSW RMY N/A TSTM
9/19 66/57/62/0/..../007/01         28 NE  AERO 25 NE  RMY 26
9/20 63/55/59/-3/..../.../..        22 NE  AERO 21 NE  RMY 19
9/21 70/55/63/+2/..../.../..        37 SSW AERO 37 SSW RMY 41
9/22 70/51/61/0/..../.../..         37 SW  AERO 36 SW  RMY 30
9/23 60/47/54/-6/..../.../..        14 N   AERO 13 N   RMY N/A 
9/24 55/50/53/-7/..../.../..        37 ENE AERO 35 ENE RMY 35
9/25 68/51/60/0/..../.../..         36 SE  AERO 37 SE  RMY 38
9/26 79/66/73/+14/..../.../..       35 SSW AERO 37 SSW RMY 37
9/27 66/56/61/+2/..../.../..        26 NNE AERO 25 NNE RMY 28
9/28 56/52/54/-4/..../.../..        24 NNE AERO 21 NNE RMY 23
9/29 71/50/61/+3/..../.../..        20 NW  AERO 18 NW  RMY 20
9/30 68/48/58/0/..../.../..         20 W   AERO 16 W   RMY N/A

DAILY RECORDS FOR SEPTEMBER

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

09/06/18: DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 92F,
          TIES PREVIOUS RECORD OF 92F SET IN 1900 


PRELIMINARY CLIMATE SUMMARY FOR OCTOBER 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

10/1 65/53/59/+2/..../.../..         21 ENE AERO 18 SSW RMY N/A
10/2 64/53/59/+2/..../.../..         33 S   AERO 32 S   RMY 35 TSTM
10/3 60/52/56/0/..../.../..          18 NNE AERO 14 NNE RMY 14
10/4 69/57/63/+7/..../.../..         29 SSW AERO 29 SSW RMY 32

10/5 Low temp since midnight is 53F; normal low is now 47F

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

RECORDS FOR OCTOBER 5
HIGH 86F IN 2007
LOW 29F IN 1965
PRECIP 3.17 INCHES IN 1962
PEAK GUST 64e MPH S IN 1979

RECORDS FOR OCTOBER 6
HIGH 83F IN 1990, 2007
LOW 26F IN 1965
PRECIP 3.78 INCHES IN 1962
PEAK GUST 60e MPH S IN 1942

TODAY'S REPORT PREPARED BY: Benjamin Turner