Monday, October 16, 2017
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, OCTOBER 16, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME
NORTHWEST WIND BRINGS DRY COOL AIR
An overnight rain shower left a trace of precipitation
by 7:00 AM EST. Skies were mostly cloudy with a mixture
of altostratus, altocumulus, and cumulus clouds. Winds
shifted before 7:00 AM EST from southwest to northwest.
This brought in cooler, dry air with a maximum of 59F and
a dew point that had fallen to 39F by 1:00 PM EST. This is
more seasonable than our high of 72F yesterday, which is over
10 degrees above the normal of 60F. Winds have been moderate
gusting to 28 MPH by 1:00 PM EST. We had a strong overnight
peak gust of 39 MPH SSW at 7:30 PM EST. With the dry air
visibility was consistent at 70 miles all day.
Today’s Observations:
7 A.M.
Weather: Broken altostratus, few cumulus NW-N, few
altocumulus W
Temperature: 57F; Dew Point: 47F; Wind: WNW at 9 kts
Sea-level pressure: 29.84 ins. Hg, rising, then more quickly
Visibility: 70 miles
6-hr Max temp: 66F
6-hr Min temp: 57F
24-hr precip: Trace
BHO SA 1155 E13 BKN 70 104/57/47/3009/984/ FEW CU NW-N
FEW AC W/ 8/120 53021 10066 20057
10 A.M.
Weather: Broken altostratus, broken altocumulus, few
distant cumulus in all directions
Temperature: 58F; Dew Point: 45F; Wind: NW at 8G16 kts
Sea-level pressure: 29.74 ins. Hg, rising, then more quickly
Visibility: 70 miles
BHO SA 1455 E14 BKN E19 BKN 70 072/58/45/3108G16/974/ FEW DSNT
CU ALQDS/ 8/120 51032
1 P.M.
Weather: Broken altocumulus, overcast altostratus
few distant cumulus in all directions
Temperature: 53F; Dew Point: 39F; Wind: NW at 10G20 kts
Sea-level pressure: 29.75 ins. Hg, rising, then more rapidly
Visibility: 70 miles
6-hr Max temp: 59F
6-hr Min temp: 53F
BHO SA 1755 E13 BKN E19 OVC 70 076/53/39/3210G20/975/ FEW DSNT
CU ALQDS/ 8/120 53004 10059 20053
SUMMARY FOR SUNDAY, OCTOBER 15, 2017
TEMPERATURE (DEGREES F)
MAX…..72 NORMAL…..61
MIN…..58 NORMAL…..43
MEAN….65 NORMAL…..52
DEPARTURE FROM 30-YEAR NORMAL……………………+13
TOTAL DEPARTURE FOR THE MONTH…………………..+121 [+7.9 DEGREES/DAY]
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0 DEPARTURE………..0
TOTAL COOLING UNITS FOR THE MONTH…………..20 DEPARTURE………+16
TOTAL COOLING UNITS FOR THE SEASON…………727 DEPARTURE……..+126
TOTAL COOLING UNITS LAST SEASON TO DATE…….894 DEPARTURE……..-167
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0 DEPARTURE………-13
TOTAL HEATING UNITS FOR THE MONTH…………..57 DEPARTURE……..-107
TOTAL HEATING UNITS FOR THE SEASON…………150 DEPARTURE……..-156
TOTAL HEATING UNITS LAST SEASON TO DATE…….215 DEPARTURE………-65
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….39 SSW AT 7:30 P.M.
AERO……………………36 SSW AT 6:59 P.M.
ASOS……………………41 S AT 7:30 P.M.
DAVIS…………………..44 S AT 7:29 P.M. RMY 40
FASTEST MILE FOR YESTERDAY…………………33 SSW AT 6:59 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………31 SSW AT 7:00 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..33 SSW AT 7:00 P.M.
AVERAGE WIND SPEED AND DIRECTION………….15.8 SSW
ASOS………………….15.9
DAVIS…………………15.1 SSW [212 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……….0.50 DEPARTURE……-1.72
ASOS…………..0.50
TOTAL PRECIPITATION FOR THE YEAR……….42.36 DEPARTURE……+1.06
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/-3/0.00/697/99 18 WNW AERO 16 NW RMY N/A
10/2 65/46/56/-1/0.00/687/98 21 NNW AERO 21 NNW RMY 21
10/3 67/50/59/+3/0.00/677/97 21 S AERO 21 S RMY N/A
10/4 75/50/63/+7/0.00/660/95 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/+15/0.23/…/.. 33 S AERO 36 SSW RMY 37
10/9 71/68/70/+16/0.22/…/.. 43 S AERO 41 S RMY 45
10/10 76/61/69/+15/0.00/…/.. 21 WNW AERO 20 WNW RMY 21
10/11 68/55/62/+9/0.00/…/.. 29 ENE AERO 25 ENE RMY 29
10/12 58/48/50/0/T/…/.. 30 NE AERO 28 ENE RMY 30
10/13 64/48/56/+3/0.00/…/.. 20 E AERO 16 E RMY 17
10/14 66/54/60/+8/…/…/.. 15 SSE AERO 13 SSE RMY 13
10/15 72/58/65/+13/…/../.. 39 SSW AERO 36 SSW RMY 40
10/16 Low temp since midnight is 57F; normal low is now 43F
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 16
HIGH 86F IN 1897
LOW 28F IN 1886
PRECIP 2.82 INCHES IN 1974
SNOWFALL TRACE IN 2009
PEAK GUST 68e MPH SSE IN 1954 (HURRICANE HAZEL)
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
TODAY’S REPORT PREPARED BY: Kaitlin Geagan
