Monday, October 12, 2026

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

MONDAY, OCTOBER 12, 2026
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0554E
SUNSET:  1707E

GRADUAL CLEARING TODAY AFTER SIGNIFICANT RAINFALL LATER YESTERDAY
AND OVERNIGHT….

The remnants of Isaias passed south of the region last night
bringing a pretty solid area of rainfall with it. Rain began
during the mid afternoon yesterday persisting through the
evening heavy at times. It then tapered to drizzle overnight
which came to an end this morning. 1.74″ of rain was measured
here at Blue Hill, most of which fell between 5pm-10pm
yesterday when 1.36″ was measured for that 5 hour period!

We started today with some lingering drizzle and dense fog, but
conditions gradually improved through the morning with a rather
nice day in progress by early this afternoon.

Temperatures are responding to the sunshine with readings into
the mid 60s early this afternoon. Dew point values are still
elevated however, rising through the 50s. So a decent amount of
moisture remains in the air.

Winds have been mostly on the light side, especially since about
8am this morning. A general northerly flow has backed to the
northwest early this afternoon. The average speed for the day
so far is around 9mph. The peak gust occurred in the wee hours
of the morning, just before 1am, with a speed of 28mph.

Visibility has greatly improved since early this morning when
it was only around 1/16th of a mile. By early this afternoon it
is up to around 70 miles!

The maximum temperature so far today is 66F, which is 3 degrees
above the normal high of 63F. The minimum temperature since
midnight is 47F, which is 2 degrees above the normal low of 45F.

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Today’s Observations:

7 A.M.
Weather: Sky obscured, vertical visibility 200ft
Temperature: 49F; Dew Point: 49F; Relative Humidity: 100%
Wind: N @ 8G16 kts
Sea-level pressure: 1008.6 mb; 29.78 in. Hg: falling, then rising
Visibility: 1/16 mile, fog
6-hr Max temp: 52F
6-hr Min temp: 47F
24-hr Precip: 1.74 inches
BHO SA 1155 X W2 1/16F 086/49/49/3608G16/978/ 8//// 55003
6006/ 70174 10052 20047

10 A.M.
Weather: Overcast stratus, few breaks in overcast NE-E
Temperature: 54F; Dew Point: 53F; Relative Humidity: 95%
Wind: NW @ 4 kts, wind light and variable
Sea-level pressure: 1008.6 mb; 29.78 in. Hg: rising, then falling
Visibility: 15 miles, thin fog
3-hr Precip: Trace
BHO SA 1455 E4 OVC 15 086/54/53/3204/978/ FEW BINOVC NE-E
THN F ALQDS WND L/V/ 8/6// 50000 6000/

1 P.M.
Weather: Broken stratocumulus
Temperature: 66F; Dew Point: 57F; Relative Humidity: 72%
Wind: NW @ 8G15 kts
Sea-level pressure: 1007.5 mb; 29.75 in. Hg: steady, then falling
Visibility: 70 miles
6-hr Max temp: 66F
6-hr Min temp: 49F
6-hr Precip: Trace
BHO SA 1755 E20 BKN 70 075/66/57/3108G15/975/ 8/500 58011
6000/ 10066 20049

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SUMMARY FOR SUNDAY, OCTOBER 11, 2026

TEMPERATURE (DEGREES F)
MAX…….58   NORMAL…..63
MIN…….48   NORMAL…..46
MEAN……53   NORMAL…..54

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-1
TOTAL DEPARTURE FOR THE MONTH (OCT)…………………+24 [+2.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2026 THRU JUN 2027)
TOTAL HEATING UNITS FOR YESTERDAY…………….12  DEPARTURE……..+1
TOTAL HEATING UNITS FOR THE MONTH (OCT)……….82  DEPARTURE…….-20
TOTAL HEATING UNITS FOR THE SEASON…………..203  DEPARTURE…….-16
TOTAL HEATING UNITS LAST SEASON TO DATE………137  DEPARTURE…….+66

COOLING DEGREE DAYS (SEASON: JAN 2026 THRU DEC 2026)
TOTAL COOLING UNITS FOR YESTERDAY……………..0  DEPARTURE………0
TOTAL COOLING UNITS FOR THE MONTH (OCT)………..9  DEPARTURE……..+4
TOTAL COOLING UNITS FOR THE SEASON…………..814  DEPARTURE……+139
TOTAL COOLING UNITS LAST SEASON TO DATE………756  DEPARTURE…….+58

PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all on Main Tower.
E=Estimated *=Last of multiple occurrences

F420C (Official)………..31 ENE  @   11:17 P.M.
VECTOR #1 (1-Sec)……….31 ENE  @   11:17 P.M.
VECTOR #2 (1-Sec)……….31 ENE  @   11:17 P.M.
DAVIS #1……………….30 E    @   11:18 P.M.
DAVIS #2 ………………31 E    @   11:17 P.M.
RMY #1 (Instantaneous)…..31 ENE  @   11:17 P.M.
RMY #2 (Instantaneous)…..32 ENE  @   11:17 P.M.
MERLIN…………………27 NE
RICHARDS (C5C) (Inst)……28 ENE  @   11:17 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………21 ENE  @   11:04 P.M.*
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..19 ENE  @   11:18 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..23 ENE  @   08:51 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………21 E    @   11:18 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………22 E    @   08:51 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..20 E    @   08:51 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..23 ENE  @   08:51 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………20 E    @   08:51 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..9.5 SSE [228 total miles] VECTOR #1………………9.5
VECTOR #2……………..10.5
DAVIS #1……………….9.6 SE
DAVIS #2…………………M
RMY #1…………………9.6 SE
RMY #2………………..10.5 SE
RICHARDS (C5C)…………10.0

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..1.74 DEPARTURE…..+1.56
TOTAL PRECIPITATION FOR THE MONTH (OCT)……..1.79 DEPARTURE…..-0.07
TOTAL PRECIPITATION FOR THE YEAR (2026)…….39.31 DEPARTURE…..-1.22

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PRELIMINARY CLIMATE SUMMARY FOR OCTOBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN)/SUN(%)/PEAK GUST/VEC1/RMY GUST
PEAK GUST: F420C (Official)
VEC1: Vector #1 1-second gust
RMY:  R.M. Young #1 wind gust recording system (Instantaneous)
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M:    Missing data

10/1  74/56/65/+7/0.00/084/12             28 SW  VEC1 28 SW  RMY 27
10/2  84/63/74/+16/0.05/518/74            33 SW  VEC1 33 SW  RMY 32
10/3  68/51/60/+3/0.00/684/98             24 NNW VEC1 24 NNE RMY 24
10/4  63/49/56/-1/T/320/46                24 ESE VEC1 23 ESE RMY 22
10/5  69/46/58/+1/0.00/581/84             43 WNW VEC1 42 WNW RMY 43
10/6  60/41/51/-5/0.00/676/98             30 WNW VEC1 30 WNW RMY 31
10/7  65/40/53/-3/0.00/660/96             31 S   VEC1 31 S   RMY 31
10/8  70/53/62/+7/0.00/506/74             33 WNW VEC1 33 SSW RMY 34
10/9  66/47/57/+2/0.00/…/..             40 WNW VEC1 39 WNW RMY 40
10/10 62/44/53/-2/0.00/…/..             22 NW  VEC1 22 NW  RMY 23
10/11 58/48/53/-1/1.63/…/..             31 ENE VEC1 31 ENE RMY 31

10/12 The low since midnight is 47F, the daily normal low is 45F.

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OCTOBER DAILY RECORDS TO DATE

NONE.

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

RECORDS FOR OCTOBER 12
HIGH 87F IN 1954
LOW 31F IN 1906
PRECIP 1.70 INCHES IN 1948
SNOWFALL TRACE IN 1904, 1941
PEAK GUST 55 MPH NW IN 1963

RECORDS FOR OCTOBER 13
HIGH 84F IN 1930,1954
LOW 29F IN 2012
PRECIP 5.87 INCHES IN 1895
SNOWFALL 4.2 INCHES IN 1934
PEAK GUST 51 MPH ENE IN 2025

TODAY’S REPORT PREPARED BY: Matt Douglas