Monday, October 9, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, OCTOBER 9, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

RECORD HIGH MINIMUM TEMPERATURE FOR SUNDAY, POSSIBLE RECORD TODAY

Yesterday’s minimum temperature of 67F was a new daily record for
high minimum temperature.  It broke the previous record of 60F set
in 1944.  67F is the highest minimum temperature ever recorded at
BHO for October having also been measured on October 13, 1990, and
today’s minimum of 68F could break that record as well if the fog
and overcast skies keep temperatures warm enough over night.
Temperatures had reached 71F by 1:00PM EST.

Intermittent rain and drizzle measured 0.03 in. for the six-hour total
at 1:00PM.  The fog and overcast skies were clearing slightly in the
early afternoon as another round of rain when visibility reached 15
miles and ceilings were at approximately 1,300 feet.  Winds remain
out of the south and have been gusting up to 25 MPH.

Today’s Observations:

7 A.M.
Weather: Sky obscurement due to fog
Temperature: 69F; Dew Point: 69F; Wind: SE at 7 kts
Sea-level pressure: 30.05 ins. Hg, rising then falling
Visibility: 1/8 mile
6-hr Max temp: 69F
6-hr Min temp: 68F
24-hr precip: 0.24 in.
BHO SA 1155 W3 X 1/8F 175/69/69/1307/005/ 8//// 50003
MANUAL 70024 ASOS 70026 10069 20068

10 A.M.
Weather: Light rain, fog, broken stratus, overcast nimbostratus
Temperature: 70F; Dew Point: 70F; Wind: S at 11G16 kts
Sea-level pressure: 30.02 ins. Hg, rising then falling
Visibility: 3 miles, variable from 2-8 miles
3-hr precip: 0.02 in.
BHO SA 1455 E6 BKN 9 OVC 3VR-F 165/70/70/1811G16/002/ VSBY 2V8/
8/62/ 58010 MANUAL 6002/ ASOS 60002

1 P.M.
Weather: Light rain, broken stratus, overcast nimbostratus
Temperature: 71F; Dew Point: 70F; Wind: S at 12G20 kts
Sea-level pressure: 29.96 ins. Hg, falling, then more quickly
Visibility: 15 miles, distant fog in all directions
6-hr Max temp: 71F
6-hr Min temp: 69F
6-hr precip: 0.03 in.
BHO SA 1755 E13 BKN 25 OVC 15R- 144/71/70/1812G20/996/ DSNT FG
ALQDS/ 8/62/ 58021 MANUAL 6003/ ASOS 60002 10071 20069

SUMMARY FOR SUNDAY, OCTOBER 8, 2017

TEMPERATURE (DEGREES F)
MAX…..71   NORMAL…..63
MIN…..67   NORMAL…..46
MEAN….69   NORMAL…..54

DEPARTURE FROM 30-YEAR NORMAL……………………+15
TOTAL DEPARTURE FOR THE MONTH……………………+57 [+7.0 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………4   DEPARTURE……….+4
TOTAL COOLING UNITS FOR THE MONTH…………..11   DEPARTURE……….+8
TOTAL COOLING UNITS FOR THE SEASON…………718   DEPARTURE……..+118
TOTAL COOLING UNITS LAST SEASON TO DATE…….894   DEPARTURE……..-176

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0   DEPARTURE………-11
TOTAL HEATING UNITS FOR THE MONTH…………..28   DEPARTURE………-49
TOTAL HEATING UNITS FOR THE SEASON…………121   DEPARTURE………-99
TOTAL HEATING UNITS LAST SEASON TO DATE…….133   DEPARTURE………-12

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….33  S  AT 10:44 A.M.
AERO……………………36 SSW AT  8:05 A.M.
ASOS……………………37 SSW AT  8:39 A.M.
DAVIS…………………..40 SSW AT  8:38 A.M.  RMY 37
FASTEST MILE FOR YESTERDAY…………………29  S  AT 10:43 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………28  S  AT 10:44 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..28 SSW AT  6:10 A.M.
AVERAGE WIND SPEED AND DIRECTION………….17.1 SSW
ASOS………………….17.0
DAVIS…………………16.5 SSW [208 DEG.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.24  DEPARTURE……+0.09
ASOS…………..0.26
TOTAL PRECIPITATION FOR THE MONTH……….0.24  DEPARTURE……-0.95
ASOS…………..0.26
TOTAL PRECIPITATION FOR THE YEAR……….42.10  DEPARTURE……+1.83
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings

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  65/42/54/-3/0.00/…/..               18 WNW AERO 16 NW  RMY N/A
10/2  65/46/56/-1/0.00/…/..               21 NNW AERO 21 NNW RMY 21
10/3  67/50/59/+3/0.00/…/..               21 S   AERO 21 S   RMY N/A
10/4  75/50/63/+7/0.00/…/..               30 SSW AERO 30 SW  RMY 32
10/5  79/60/70/+14/0.00/…/..              28 SW  AERO 26 SW  RMY N/A
10/6  73/57/65/+10/T/…/..                 15 NW  AERO 14 NW  RMY 15
10/7  75/59/67/+12/T/…/..                 29 S   AERO 30 SSW RMY N/A
10/8  71/67/69/+15/…./../..               33 S   AERO 36 SSW RMY 37

10/9 Low temp since midnight is 68F; normal low is now 46F

DAILY RECORDS FOR OCTOBER

10/7/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 67F,
BREAKS PREVIOUS RECORD OF 60F SET IN 1944

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

RECORDS FOR OCTOBER 9
HIGH 82F IN 2011
LOW 29F IN 1907,1937
PRECIP 2.54 INCHES IN 1976
SNOWFALL 0.2 INCHES IN 1888
PEAK GUST 81e MPH S IN 1976 (RECORD FOR MONTH)

RECORDS FOR OCTOBER 10
HIGH 85F IN 1949
LOW 27F IN 1929
PRECIP 2.02 INCHES IN 1998
SNOWFALL 6.8 INCHES IN 1979 (RECORD FOR MONTH)
PEAK GUST 59 MPH WNW IN 1958

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle