Monday, October 18, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
MONDAY, OCTOBER 18, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0601E
SUNSET: 1657E
FAIR WEATHER WITH A COOL BREEZE AFTER SOME OVERNIGHT RAINFALL….
A few showers moved through during the wee hours of the morning
amounting to 0.01″ of rainfall. Otherwise it’s been a fair
weather day with a few clouds decorating the sky.
A busy west-northwest wind has been blowing all day averaging
around 13 mph with a peak gust thus far of 29 mph.
The wind, along with a dew point in the mid-upper 30s is adding
a chill to the air, finally feeling like fall here at Blue Hill!
Visibility has been excellent, holding at around 80 miles all day.
The high so far today is 60F, equal to the normal max of 60F.
The low since midnight is 45F, 2 degrees above the normal low
of 43F.
Today’s Observations:
7 A.M.
Weather: Clear, few stratocumulus all quadrants, few altocumulus
overhead-N-E-SE, few cirrus distant N-ESE
Temperature: 45F; Dew Point: 41F; Relative Humidity: 86%
Wind: WNW @ 11G17 kts
Sea-level pressure: 1007.2 mb; 29.74 in. Hg: rising, then more rapidly
Visibility: 80 miles
6-hr Max temp: 47F
6-hr Min temp: 45F
24-hr Precip: 0.01 ins.
BHO SA 1155 CLR 80 072/45/41/2911G17/974/ FEW SC ALQDS FEW AC OVHD-N-E-SE
FEW CI DSNT N-ESE/ 8/571 53009 6001/ 70001 10047 20045
10 A.M.
Weather: Scattered stratocumulus, scattered altocumulus,
thin scattered cirrus
Temperature: 52F; Dew Point: 37F; Relative Humidity: 56%
Wind: WNW @ 13G20 kts
Sea-level pressure: 1007.0 mb; 29.74 in Hg; rising, then falling
Visibility: 80 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 45 SCT 120 SCT 250 -SCT 80 070/52/37/3013G20/974/ 8/571 58002
1 P.M.
Weather: Scattered stratocumulus, thin scattered cirrus
Temperature: 59F, Dew point: 36F; Relative Humidity: 41%
Wind: NW @ 10G23 kts
Sea-level pressure: 1006.1 mb; 29.71 in Hg; falling, then steady
Visibility: 80 miles
6-hr Max temp: 60F
6-hr Min temp: 45F
6-hr Precip: 0.00 ins.
BHO SA 1755 45 SCT 250 -SCT 80 061/59/36/3010G23/971/ 8/501 56009 10060 20045
SUMMARY FOR SUNDAY, OCTOBER 17, 2021
TEMPERATURE (DEGREES F)
MAX…….62 NORMAL…..61
MIN…….47 NORMAL…..44
MEAN……55 NORMAL…..52
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….. +3
TOTAL DEPARTURE FOR THE MONTH……………………..+92 [+5.2 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY……………10 DEPARTURE……..-3
TOTAL HEATING UNITS FOR THE MONTH……………80 DEPARTURE…….-95
TOTAL HEATING UNITS FOR THE SEASON………….154 DEPARTURE……-139
TOTAL HEATING UNITS LAST SEASON TO DATE……..245 DEPARTURE…….-91
COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021)
TOTAL COOLING UNITS FOR YESTERDAY…………….0 DEPARTURE………0
TOTAL COOLING UNITS FOR THE MONTH…………….3 DEPARTURE……..-3
TOTAL COOLING UNITS FOR THE SEASON………….717 DEPARTURE…….+41
TOTAL COOLING UNITS LAST SEASON TO DATE……..831 DEPARTURE……-114
PEAK WIND GUST (MPH):
Official……………….32 WNW @ 11:47 A.M.
AEROVANE (south tower)…..31 WNW @ 11:47 A.M.
VECTOR #2 (south tower)….35 @ 11:47 A.M.
DAVIS #2 (south tower)…..31 WNW @ 11:47 A.M.
RMY #2 (south tower)…….31 WNW @ 11:47 A.M.
ASOS………..OUT OF SERVICE D/T RENOVATIONS
VECTOR #1……OUT OF SERVICE D/T RENOVATIONS
DAVIS #1…….OUT OF SERVICE D/T RENOVATIONS
RMY #1………OUT OF SERVICE D/T RENOVATIONS
MERLIN………OUT OF SERVICE D/T RENOVATIONS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………24 WNW @ 11:31 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..23 @ 11:48 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………23 WNW @ 11:16 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..23 WNW @ 11:15 A.M
MAXIMUM 2-MINUTE ASOS AVERAGE…….OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE…OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE..OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE RMY #1 AVERAGE…..OUT OF SERVICE D/T RENOVATIONS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..11.7 WNW [281 total miles]
VECTOR #2………………12.5
DAVIS #2……………….12.4 NW
RMY #2…………………12.3 WNW
RMY #1…………..OUT OF SERVICE D/T RENOVATIONS
ASOS…………….OUT OF SERVICE D/T RENOVATIONS
VECTOR #1………..OUT OF SERVICE D/T RENOVATIONS
DAVIS #1…………OUT OF SERVICE D/T RENOVATIONS
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.01 DEPARTURE….-0.18
TOTAL PRECIPITATION FOR THE MONTH………….2.42 DEPARTURE….-0.50
TOTAL PRECIPITATION FOR THE YEAR………….49.40 DEPARTURE….+8.07
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 64/44/54/-4/0.00/583/83 20 WNW AERO 20 WNW RMY N/A
10/02 73/47/60/+2/0.00/567/81 24 WSW AERO 23 WSW RMY N/A
10/03 65/55/60/+3/0.09/070/10 19 E AERO 19 E RMY N/A
10/04 59/51/55/-2/1.69/000/00 30 E AERO 30 E RMY N/A
10/05 58/50/54/-3/0.30/000/00 22 NNE AERO 23 NE RMY N/A
10/06 69/50/60/+4/0.00/407/59 15 N AERO 16 N RMY N/A
10/07 73/55/64/+8/0.00/550/80 15 WSW AERO 15 W RMY N/A
10/08 69/55/62/+7/T/616/90 24 ENE AERO 23 ENE RMY N/A
10/09 62/54/58/+3/0.01/273/40 23 E AERO 23 E RMY N/A
10/10 62/54/58/+3/T/000/00 22 E AERO 21 E RMY N/A
10/11 67/56/62/+8/0.01/…/.. 20 NE AERO 21 NE RMY N/A
10/12 72/54/63/+9/0.00/…/.. 15 SW AERO 15 SW RMY N/A
10/13 75/55/65/+11/0.00/…/.. 18 SW AERO 18 SW RMY N/A
10/14 73/56/65/+12/0.00/…/.. 19 N AERO 20 N RMY N/A
10/15 74/55/67/+14/0.00/…/.. 24 S AERO 24 SSW RMY N/A
10/16 73/59/66/+14/0.06/…/.. 43 S AERO 50 S RMY 44
10/17 62/47/55/+3/0.25/…/.. 32 WNW AERO 31 WNW RMY 31
10/18 The low since midnight is 45F, the daily normal low is 43F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
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
RECORDS FOR OCTOBER 19
HIGH 81F IN 1945
LOW 21F IN 1922
PRECIP 3.64 INCHES IN 1932
SNOWFALL 1.0 INCHES IN 1972
PEAK GUST 66 MPH SSW IN 1967
TODAY’S REPORT PREPARED BY: Matt Douglas
