Wednesday, October 17, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, OCTOBER 17, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

FAIR AUTUMN WEATHER WITH INCREASING WIND IN THE
AFTERNOON….

The sky had very few clouds since this morning, but cloud cover
increased in the early afternoon. Wind intensified following the
1 P.M. observation, remaining from the west. Multiple gusts above
30 mph have been observed. The high temperature so far today is
60F, which is the same as the daily normal. The low since midnight
is 39F, which is 3 degrees below the normal minimum of 42F.

Today’s Observations:

7 A.M.
Weather: Scattered cirrus, few distant cumulus SW-NW
Temperature: 41F; Dew Point: 36F; Wind: W at 9G15 kts
Sea-level pressure: 29.91 ins. Hg, falling steadily
Visibility: 40 miles, smoke layer along horizon
6-hr Max temp: 52F
6-hr Min temp: 39F
24-hr Precip: 0.00 ins.
BHO SA 1155 250 SCT 40 128/41/36/2209G15/991/ K LYR ALG HRZN/
8/005 56014 10052 20039

10 A.M.
Weather: Scattered cirrostratus
Temperature: 53F; Dew Point: 34F; Wind: W at 9G16 kts
Sea-level pressure: 29.87 ins. Hg, falling steadily
Visibility: 70 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 250 SCT 70 116/53/34/2209G16/987/ 8/005 58012

1 P.M.
Weather: Broken cumulus
Temperature: 59F; Dew Point: 38F; Wind: W at 13G23 kts,
Peak wind: 30 mph (26 kts) W at 12:20 P.M.
Sea-level pressure: 29.77 ins. Hg, falling rapidly
Visibility: 40 miles, distant haze SW-NW
6-hr Max temp: 60F
6-hr Min temp: 41F
6-hr Precip: 0.00 ins.
BHO SA 1755 E55 BKN 40 080/59/38/2818G23/977/ DSNT HZ
SW-NW PK WND 2826/20/ 8/100 56036 10060 20041

SUMMARY FOR TUESDAY, OCTOBER 16, 2018

TEMPERATURE (DEGREES F)
MAX…..56   NORMAL…..60
MIN…..41   NORMAL…..43
MEAN….49   NORMAL…..51

DEPARTURE FROM 30-YEAR NORMAL…………………..-2
TOTAL DEPARTURE FOR THE MONTH…………………..49 [+2.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..16   DEPARTURE………+2
TOTAL HEATING UNITS FOR THE MONTH………….132   DEPARTURE……..-46
TOTAL HEATING UNITS FOR THE SEASON…………219   DEPARTURE…….-101
TOTAL HEATING UNITS LAST SEASON TO DATE…….162   DIFFERENCE…….+57

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0  DEPARTURE………..0
TOTAL COOLING UNITS FOR THE MONTH…………..11  DEPARTURE……….+6
TOTAL COOLING UNITS FOR THE SEASON…………874  DEPARTURE……..+272
TOTAL COOLING UNITS LAST SEASON TO DATE…….727  DIFFERENCE…….+147

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..48 W   AT 2:40   A.M.
AERO…………………….60 W   AT 2:46   A.M.
ASOS…………………….50 NW  AT 12:16  A.M.
DAVIS……………………53 WNW AT 12:16  A.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….38 W   AT  2:46  A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….35 NW  AT  2:49  A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………38 WNW AT  2:49  A.M.
AVERAGE WIND SPEED AND DIRECTION……………16.1 W
ASOS……………………15.8
DAVIS…………………..16.4 WNW [284 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……….2.75  DEPARTURE……+0.38
ASOS…………..2.73
TOTAL PRECIPITATION FOR THE YEAR……….49.95  DEPARTURE……+8.68
ASOS………….51.65

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/-6/0.94/000/00        30 E   AERO 28 E   RMY 28
9/11 75/61/68/+3/0.43/000/00        23 E   AERO 21 E   RMY N/A TSTM
9/12 69/63/66/+1/0.43/000/00        21 ENE AERO 21 ENE RMY 21  TSTM
9/13 68/62/65/+1/0.57/091/12        21 NE  AERO 21 NE  RMY N/A TSTM
9/14 75/61/68/+4/0.00/233/31        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/+10/0.00/695/93       15 S   AERO 14 S   RMY N/A
9/17 82/64/73/+10/0.01/372/50       22 SSW AERO 22 SSW RMY N/A
9/18 74/67/71/+9/3.34/000/00        31 SSW AERO 30 SSW RMY N/A TSTM
9/19 66/57/62/0/0.09/007/01         28 NE  AERO 25 NE  RMY 26
9/20 63/55/59/-3/0.00/110/15        22 NE  AERO 21 NE  RMY 19
9/21 70/55/63/+2/0.00/352/48        37 SSW AERO 37 SSW RMY 41
9/22 70/51/61/0/0.07/175/24         37 SW  AERO 36 SW  RMY 30
9/23 60/47/54/-6/0.00/058/08        14 N   AERO 13 N   RMY N/A
9/24 55/50/53/-7/0.00/000/00        37 ENE AERO 35 ENE RMY 35
9/25 68/51/60/0/1.74/000/00         36 SE  AERO 37 SE  RMY 38
9/26 79/66/73/+14/0.39/244/34       35 SSW AERO 37 SSW RMY 37
9/27 66/56/61/+2/0.17/465/65        26 NNE AERO 25 NNE RMY 28
9/28 56/52/54/-4/0.49/029/04        24 NNE AERO 21 NNE RMY 23
9/29 71/50/61/+3/0.00/518/73        20 NW  AERO 18 NW  RMY 20
9/30 68/48/58/0/0.00/650/92         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

10/01 65/53/59/+2/…./042/06         21 ENE AERO 18 SSW RMY N/A
10/02 64/53/59/+2/…./000/00         33 S   AERO 32 S   RMY 35 TSTM
10/03 60/52/56/0/…./000/00          18 NNE AERO 14 NNE RMY 14
10/04 69/57/63/+7/…./209/30         29 SSW AERO 29 SSW RMY 32
10/05 64/47/56/0/…./638/92          25 NE  AERO 21 NE  RMY 24
10/06 64/45/55/0/0.00/276/40          23 SSW AERO 23 SSW RMY 25
10/07 75/56/66/+11/…./076/11        28 NE  AERO 24 ENE RMY 27
10/08 56/53/55/+1/…./000/00         22 ENE AERO 20 ENE RMY N/A
10/09 75/56/66/+12/…./211/31        26 WSW AERO 28 SW  RMY 29
10/10 82/65/74/+20/…./496/73        24 WSW AERO 23 WSW RMY 25
10/11 70/56/63/+10/…./…/..        48 NNE AERO 47 NNE RMY 50
10/12 59/44/52/-1/…./…/..         32 NW  AERO 32 NW  RMY 33
10/13 49/40/45/-8/…./…/..         21 WNW AERO 20 WNW RMY 20
10/14 55/37/46/-6/…./…/..         21 W   AERO 18 W   RMY 21
10/15 66/44/55/+3/…./…/..         46 W   AERO 46 W   RMY N/A
10/16 56/41/49/-2/…./…/..         48 W   AERO 48 W   RMY N/A

10/17 Low temp since midnight is 39F; normal low is 42F

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

RECORDS FOR OCTOBER 17
HIGH 86F IN 1947
LOW 25F IN 1886
PRECIP 1.87 INCHES IN 1989
SNOWFALL TRACE IN 1970
PEAK GUST 55 MPH NE IN 1964

RECORDS FOR OCTOBER 18
HIGH 82F IN 1908
LOW 26F IN 1939
PRECIP 2.79 INCHES IN 1975
SNOWFALL 3.0 INCHES IN 2009
PEAK GUST 66 MPH S IN 1967

TODAY’S REPORT PREPARED BY: Benjamin Turner