Friday, January 15, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
FRIDAY, JANUARY 15, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0711E
SUNSET: 1637E
CONSIDERABLE CLOUDINESS IN THE WAKE OF YESTERDAY’S RAINFALL…
While it’s fairly meager, we managed to squeeze out 0.09 inches
from yesterday’s disturbance. This was good enough to conclude
our 8-day dry streak. However, we continue to hold a precipitation
deficit on the month, which now stands at -1.41 inches.
Snowfall is below average for the year as well at -6.0 inches,
though running a 4.2 inch surplus on the season thanks
to that sizable winter storm in mid-December.
Today has featured very hazy conditions and filtered sunshine
at best. Max visibility so far is 20 miles. Temperatures remain
on the mild side once again with a low of just 32F and a high
so far of 40F. This will mark the 25th consecutive day above
average….one of the longest streaks on record here!
Winds have been uneventful over the past couple days.
Yesterday’s average speed was just 5.8 MPH!
The high temperature so far today is 40F, 7 degrees above the
daily normal maximum of 33F. The low since midnight is 32F,
15 degrees above the normal minimum of 17F.
Today’s Observations:
7 A.M.
Weather: Broken Stratus (fog slowly dissipating)
Temperature: 32F; Dew Point: 32F; Relative Humidity: 100%
Wind: N @ 7 kts
Sea-level pressure: 30.03 in Hg; rising, then rising more rapidly
Visibility: 2 miles, fog
6-hr Max temp: 33F
6-hr Min temp: 32F
24-hr Precip: 0.09 ins.
24-hr Snow: Trace
Snow Depth: 0 ins.
BHO SA 1155 25 BKN 2F 170/32/32/3607/003/ DNS FG SLWLY DSPTNG
NEW SNW PST 24 HRS TRACE/ 8/6// 53019 70009 10033 20032
10 A.M.
Weather: Broken Stratocumulus
Temperature: 37F; Dew Point: 32F; Relative Humidity: 81%
Wind: NE @ 5 kts (wind light)
Sea-level pressure: 30.09 in Hg; rising unsteadily
Visibility: 10 miles, hazy
3-hr Precip: 0.00 ins.
3-hr Snow: 0.0 ins.
BHO SA 1455 30 BKN 10 191/37/32/0505/009/ HAZY WND LGT/ 8/500 52021
1 P.M.
Weather: Broken Stratocumulus, Broken Cirrostratus
Temperature: 38F, Dew point: 32F; Relative Humidity: 78%
Wind: ENE @ 7 kts
Sea-level pressure: 30.06 inches Hg, falling, then falling more rapidly
Visibility: 20 miles, hazy
6-hr Max temp: 40F
6-hr Min temp: 32F
6-hr Precip: 0.00 ins.
6-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 30 BKN 250 BKN 20 179/38/32/0709/006/ HAZY/ 8/506 58012
10040 20032
SUMMARY FOR THURSDAY, JANUARY 14, 2021
TEMPERATURE (DEGREES F)
MAX…….38 NORMAL…..34
MIN…….31 NORMAL…..17
MEAN……35 NORMAL…..25
DEPARTURE FROM 30-YEAR (1981-2010) NORMAL…….+10
TOTAL DEPARTURE FOR THE MONTH……………….+87 [+6.0 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………30 DEPARTURE……-10
TOTAL HEATING UNITS FOR THE MONTH…………..462 DEPARTURE……-86
TOTAL HEATING UNITS FOR THE SEASON…………2392 DEPARTURE…..-460
TOTAL HEATING UNITS LAST SEASON TO DATE…….2646 DEPARTURE…..-254
PEAK WIND GUST (MPH):
420C/Official…………..16 SSW @ 2:03 A.M.
AEROVANE (south tower)…..16 SSW @ 1:12 A.M.
ASOS…………………..17 SW @ 8:55 A.M.
DAVIS #1……………….18 N @ 1:07 A.M.
DAVIS #2 (south tower)…..17 SSW @ 1:10 A.M.
RMY……………………19 @ 2:24 A.M.
VECTOR…………………19 @ 2:03 A.M.
MERLIN…………………17
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………13 SSW @ 2:42 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….13 SSW @ 2:45 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………13 SW @ 2:35 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………14 SSW @ 2:35 A.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..13 SSW @ 2:32 A.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..14 @ 1:05 A.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL… 5.8 SSW [138 total miles]
ASOS……………… 6.2 [149 total miles]
DAVIS #1………….. 6.1 WSW [146 total miles]
DAVIS #2………….. 6.3 SW [151 total miles]
RMY………………. 6.2 SSW [149 total miles]
VECTOR……………. 6.6 [158 total miles]
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.09 DEPARTURE….-0.06
ASOS………….0.10
TOTAL PRECIPITATION FOR THE MONTH………….0.58 DEPARTURE….-1.41
ASOS………….0.58
TOTAL PRECIPITATION FOR THE YEAR…………..0.58 DEPARTURE….-1.41
ASOS…………0.58
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M………….T DEPARTURE…..-0.6
TOTAL SNOWFALL FOR THE MONTH……………… 1.9 DEPARTURE…..-6.0
TOTAL SNOWFALL FOR THE SEASON……………..28.1 DEPARTURE…..+4.2
PRELIMINARY CLIMATE SUMMARY FOR JANUARY CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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
01/01 36/25/31/+4/0.06/0.3/…/.. 23 E AERO 23 NNW RMY 23
01/02 43/30/37/+10/0.30/T/…/.. 37 WNW AERO 39 WNW RMY 44
01/03 33/27/30/+4/0.07/0.8/…/.. 23 NNE AERO 22 NNE RMY 25
01/04 37/28/33/+7/0.01/0.1/…/.. 25 NNE AERO 23 NNE RMY 27
01/05 31/28/30/+4/0.05/0.7/…/.. 21 NNW AERO 21 NNW RMY 22
01/06 38/28/33/+7/T/T/…/.. 30 NW AERO 29 NW RMY 32
01/07 42/26/34/+8/0.00/0.0/…/.. 28 NNW AERO 26 NNW RMY 31
01/08 40/21/31/+5/0.00/0.0/…/.. 25 NNW AERO 22 NNW RMY 25
01/09 34/30/27/+1/0.00/0.0/…/.. 25 N AERO 23 N RMY 24
01/10 39/24/32/+7/0.00/0.0/…/.. 25 NNW AERO 23 NNW RMY 24
01/11 34/25/30/+5/0.00/0.0/…/.. 17 SW AERO 16 SSW RMY 16
01/12 40/24/32/+7/0.00/0.0/…/.. 23 WNW AERO 23 WNW RMY 24
01/13 40/26/33/+8/0.00/0.0/…/.. 15 SW AERO 14 SW RMY 19
01/14 38/31/35/+10/0.09/T/…/.. 16 SSW AERO 16 SSW RMY 19
01/15 The low since midnight is 32F, the daily normal low is 17F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR JANUARY 15
HIGH 64F IN 1995
LOW -16F IN 1957 [RECORD FOR MONTH]
PRECIP 2.63 INS. IN 1958
SNOWFALL 8.8 INS. IN 1983
PEAK GUST 69e MPH SE IN 1940
RECORDS FOR JANUARY 16
HIGH 63F IN 1995
LOW -12F IN 2004
PRECIP 1.32 INS. IN 1936
SNOWFALL 14.0 INS. IN 1965
PEAK GUST 79 MPH WNW IN 1960
TODAY’S REPORT PREPARED BY: Andrew Swanson
