Tuesday, October 10, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, OCTOBER 10, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

NEW OCTOBER HIGH MINIMUM TEMPERATURE RECORD

Yesterday’s minimum temperature of 68F was a new daily record
for high minimum temperature as well as a new monthly record.
The previous high minimum temperature record for October of 67F
was first set on October 13, 1990 and was matched just two days
ago on Sunday, October 8, 2017.

Conditions have been less humid today with drier but still warm
air moving into the region.  Temperatures had reached 76F by
1:00PM EST, and dew points measured in the low 60s.  Visibility
was great at 80 miles for each observation.  Winds shifted out
of the northwest and west-northwest shortly after midnight.

Today is the last day for Chief Observer Cecilia Borries-Strigle.
She will be moving back to Alaska and enjoying winter a little
bit earlier this year.

Today’s Observations:

7 A.M.
Weather: Few distant cumulus W-NW, few altocumulus E-S, few
cirrus E-WSW
Temperature: 64F; Dew Point: 61F; Wind: NW at 11 kts
Sea-level pressure: 29.99 ins. Hg, rising, then more slowly
Visibility: 80 miles, except 70 miles NW
6-hr Max temp: 71F
6-hr Min temp: 63F
24-hr precip: 0.21 in.
BHO SA 1155 CLR 80 156/64/61/3111/999/ FEW CU DSNT W-NW FEW
AC E-S FEW CI E-WSW VSBY NW 70/ 8/132 51018 MANUAL 70021
ASOS 70020 10071 20063

10 A.M.
Weather: Scattered cumulus, scattered cirrus
Temperature: 71F; Dew Point: 62F; Wind: WNW at 9 kts
Sea-level pressure: 30.01 ins. Hg, rising, then more slowly
Visibility: 80 miles
BHO SA 1455 44 SCT 250 SCT 80 163/71/62/2909/001/ 8/102 51007

1 P.M.
Weather: Few cumulus in all directions, broken altocumulus,
broken cirrus
Temperature: 74F; Dew Point: 60F; Wind: W at 9 kts
Sea-level pressure: 30.00 ins. Hg, falling, then more quickly
Visibility: 80 miles
6-hr Max temp: 76F
6-hr Min temp: 64F
BHO SA 1755 E180 BKN 250 BKN 80 160/74/60/2809/000/ FEW CU
ALQDS/ 8/131 58003 10076 20064

SUMMARY FOR MONDAY, OCTOBER 9, 2017

TEMPERATURE (DEGREES F)
MAX…..71   NORMAL…..63
MIN…..68   NORMAL…..45
MEAN….70   NORMAL…..54

DEPARTURE FROM 30-YEAR NORMAL……………………+16
TOTAL DEPARTURE FOR THE MONTH……………………+73 [+7.9 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………5   DEPARTURE……….+5
TOTAL COOLING UNITS FOR THE MONTH…………..16   DEPARTURE………+13
TOTAL COOLING UNITS FOR THE SEASON…………723   DEPARTURE……..+123
TOTAL COOLING UNITS LAST SEASON TO DATE…….894   DEPARTURE……..-171

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0   DEPARTURE………-11
TOTAL HEATING UNITS FOR THE MONTH…………..28   DEPARTURE………-61
TOTAL HEATING UNITS FOR THE SEASON…………121   DEPARTURE……..-110
TOTAL HEATING UNITS LAST SEASON TO DATE…….144   DEPARTURE………-23

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….43 S AT 5:26 P.M.
AERO……………………41 S AT 5:26 P.M.
ASOS……………………46 S AT 5:27 P.M.
DAVIS…………………..44 S AT 5:27 P.M.   RMY 45
FASTEST MILE FOR YESTERDAY…………………34 S AT 5:27 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………31 S AT 5:28 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..31 S AT 5:27 P.M.
AVERAGE WIND SPEED AND DIRECTION………….14.9 S
ASOS………………….14.6
DAVIS…………………13.7 SSW [202 DEG.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.21  DEPARTURE……+0.07
ASOS…………..0.20
TOTAL PRECIPITATION FOR THE MONTH……….0.45  DEPARTURE……-0.88
ASOS…………..0.46
TOTAL PRECIPITATION FOR THE YEAR……….42.31  DEPARTURE……+1.90
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  71/68/70/+16/…./../..               43 S   AERO 41 S   RMY 45

10/10 Low temp since midnight is 63F; normal low is now 45F

DAILY RECORDS FOR OCTOBER

10/8/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 67F,
BREAKS PREVIOUS RECORD OF 60F SET IN 1944

10/9/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 68F,
BREAKS PREVIOUS RECORD OF 61F SET IN 2011

10/9/17: MONTHLY RECORD HIGH MINIMUM TEMPERATURE OF 68F,
BREAKS PREVIOUS RECORD OF 67F SET ON OCTOBER 13, 1990
AND TIED ON OCTOBER 8, 2017

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

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

RECORDS FOR OCTOBER 11
HIGH 80F IN 1919, 1949
LOW 28F IN 1993
PRECIP 0.96 INCHES IN 1903
SNOWFALL (NONE)
PEAK GUST 66e MPH WNW IN 1941

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle