Saturday, December 30, 2023
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SATURDAY, DECEMBER 30, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0713E
SUNSET: 1620E
YET ANOTHER DREARY DECEMBER DAY FEATURING LIGHT RAIN AND FOG….
Light rain has been mostly ongoing since this morning, with 0.01″
falling before 7am and another 0.06″ falling between 7am and 1pm,
giving us a total of 0.07″ for the day so far.
Similar to yesterday, temperatures remain trapped in the upper
30s to lower 40s, with very little change since the first observation
at 7am.
The wind began the day very light, but since around 11am has picked up
speed. The average so far is 8mph, primarily out of the west-northwest.
Our peak gust occurred just before 1pm, with a speed of 23mph.
Visibility was limited to a mile or less for much of the morning
as the top of the hill was shrouded in fog. As the cloud base has
lifted, however, views have increased to 10 miles, revealing the
Boston skyline.
The maximum temperature so far today is 42F degrees, this is 5
degrees above the normal high of 37F. The minimum temperature since
midnight is 39F degrees, this is 18 degrees above the normal low
of 21F.
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Today’s Observations:
7 A.M.
Weather: Sky obscured, vertical visibility 200ft
Temperature: 40F; Dew Point: 39F; Relative Humidity: 98%
Wind: WNW @ 5 kts, wind light
Sea-level pressure: 999.7 mb; 29.52 in. Hg: falling steadily
Visibility: 1 mile, fog
6-hr Max temp: 42F
6-hr Min temp: 40F
24-hr Precip: 0.05 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 X W2 1F 997/40/39/3005/952/ WND LGT/ 8//// 57008 6001/
70005 10042 20040
10 A.M.
Weather: Sky obscured, vertical visibility 200ft, very light rain
Temperature: 40F; Dew Point: 40F; Relative Humidity: 100%
Wind: W @ 8 kts
Sea-level pressure: 1000.2 mb; 29.54 in. Hg: falling, then rising
Visibility: 3/4 mile, fog
3-hr Precip: 0.01 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 X W2 3/4R-F 002/40/40/2808/954/ PCPN VRY LGT/ 8//// 53005
6001/
1 P.M.
Weather: Overcast stratus, light rain, lower stratus fractus
all quadrants and occasionally drifting over summit,
few breaks in overcast S-SSW and distant SE-SW,
higher clouds visible S-SSW
Temperature: 40F; Dew Point: 40F; Relative Humidity: 100%
Wind: W @ 11G19 kts
Sea-level pressure: 998.9 mb; 29.50 in. Hg: falling, then more slowly
Visibility: 10 miles, thin fog
6-hr Max temp: 40F
6-hr Min temp: 39F
6-hr Precip: 0.06 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 E4 OVC 10R- 989/40/40/2811G19/950/ LWR STRFA ALQDS AND OCNLY
DRFTG OVR SMT FEW BINOVC S-SSW AND DSNT SE-SW HIER CLDS VSBL S-SSW
THN F ALQDS/ 8/7// 56013 6006/ 10040 20039
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SUMMARY FOR FRIDAY, DECEMBER 29, 2023
TEMPERATURE (DEGREES F)
MAX…….44 NORMAL…..37
MIN…….38 NORMAL…..21
MEAN……41 NORMAL…..29
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….+12
TOTAL DEPARTURE FOR THE MONTH…………………+183 [+6.1 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY……………24 DEPARTURE…….-12
TOTAL HEATING UNITS FOR THE MONTH…………..750 DEPARTURE……-184
TOTAL HEATING UNITS FOR THE SEASON…………1837 DEPARTURE……-301
TOTAL HEATING UNITS LAST SEASON TO DATE…….1880 DEPARTURE…….-43
PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all Main Tower.
E=Estimated
F420C (Official)……….E18 N @ 02:37 A.M.
VECTOR #1 (1-Sec)……….18 N @ 12:04 A.M.
VECTOR #2 (1-Sec)……….17 N @ 12:24 A.M.
DAVIS #1……………….15 N @ 12:04 A.M.
DAVIS #2 ………………15 N @ 12:24 A.M.
RMY #1 (Instantaneous)…..19 N @ 12:04 A.M.
RMY #2 (Instantaneous)…..17 N @ 12:24 A.M.
MERLIN………………….M
RICHARDS (C5C) (Inst)……18 @ 12:04 A.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………11 N @ 12:22 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..12 @ 12:23 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..12 @ 07:56 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………12 N @ 12:23 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………11 WSW @ 07:57 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..11 N @ 12:05 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..12 WSW @ 07:56 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………12 @ 12:05 A.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….5.3 SW [121 total miles]
VECTOR #1……………..6.5
VECTOR #2……………..6.6
DAVIS #1………………5.8 WSW
DAVIS #2………………5.6 WSW
RMY #1………………..6.3 W
RMY #2………………..6.5 W
RICHARDS (C5C)…………6.5
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.05 DEPARTURE…..-0.11
TOTAL PRECIPITATION FOR THE MONTH…………..7.27 DEPARTURE…..+2.20
TOTAL PRECIPITATION FOR THE YEAR…………..58.64 DEPARTURE…..+5.10
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……-0.5
TOTAL SNOWFALL FOR THE MONTH………………..0.3 DEPARTURE…..-11.2
TOTAL SNOWFALL FOR THE SEASON (2023-2024)…….0.3 DEPARTURE…..-13.7
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PRELIMINARY CLIMATE SUMMARY FOR DECEMBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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
12/1 51/38/45/+8/0.04/0.0/213/38 29 SW VEC1 28 SW RMY 29
12/2 48/43/46/+9/T/0.0/000/00 18 SSW VEC1 19 SSW RMY 19
12/3 44/41/43/+7/0.76/0.0/000/00 31 ENE VEC1 32 ENE RMY 33
12/4 49/37/43/+7/0.07/0.0/155/28 23 W VEC1 22 W RMY 23
12/5 38/28/33/-3/0.00/0.0/144/26 23 NNW VEC1 24 NW RMY 24
12/6 34/22/28/-7/0.01/0.3/100/18 21 N VEC1 21 N RMY 20
12/7 28/17/56/-12/0.00/0.0/121/22 18 NNW VEC1 18 NW RMY 19
12/8 42/24/33/-2/0.00/0.0/530/96 20 S VEC1 18 S RMY 18
12/9 52/33/43/+9/0.00/0.0/264/48 24 S VEC1 24 S RMY 24
12/10 60/43/52/+18/0.66/0.0/033/06 55 SSW VEC1 54 SSW RMY 53
12/11 61/33/47/+13/1.96/0.0/038/07 69 SSW VEC1 69 SSW RMY 71
12/12 42/29/36/+2/0.00/0.0/543/99 33 WNW VEC1 32 WNW RMY 34
12/13 43/28/36/+3/0.00/0.0/470/86 36 WNW VEC1 34 WNW RMY 36
12/14 34/22/28/-5/0.00/0.0/520/95 31 SW VEC1 31 SW RMY 32
12/15 53/30/42/+9/0.00/0.0/541/99 31 WNW VEC1 30 WNW RMY 28
12/16 50/36/43/+11/0.00/0.0/530/97 21 ESE VEC1 22 ESE RMY 22
12/17 55/37/46/+14/0.47/0.0/098/18 40 SSE VEC1 41 SSE RMY 41
12/18 61/42/52/+20/2.47/0.0/000/00 90 SSE VEC1 95 SSE RMY 101
12/19 46/30/38/+6/0.00/0.0/332/61 28 NW VEC1 28 NW RMY 26
12/20 41/26/34/+3/0.00/0.0/540/99 26 NNW VEC1 27 NNW RMY 28
12/21 34/20/27/-4/0.00/0.0/534/98 29 NNW VEC1 30 NNW RMY 28
12/22 34/16/25/-6/0.00/0.0/540/99 18 NNW VEC1 18 NNW RMY 19
12/23 42/26/34/+3/0.00/0.0/414/76 18 SSW VEC1 18 SSW RMY 16
12/24 46/35/41/+11/0.01/0.0/000/00 16 SE VEC1 16 SE RMY 16
12/25 53/41/47/+17/0.01/0.0/409/75 15 ENE VEC1 15 SE RMY 14
12/26 52/32/42/+12/0.00/0.0/245/45 18 SW VEC1 18 SW RMY 19
12/27 52/39/45/+15/0.02/0.0/000/00 18 SW VEC1 18 SW RMY 19
12/28 44/39/42/+13/0.72/0.0/000/00 40 NE VEC1 41 NE RMY 40
12/29 44/38/41/+12/0.06/0.0/…/.. 18 N VEC1 18 N RMY 19
12/30 The low since midnight is 40F, the daily normal low is 21F
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DECEMBER DAILY RECORDS TO DATE
12/18: RECORD MAXIMUM TEMPERATURE OF 61F;
BEATS OLD RECORD OF 59F SET IN 1928
12/18: RECORD PRECIPITATION OF 2.47 INS;
BEATS OLD RECORD OF 1.44 INS SET IN 1915
12/18: RECORD PEAK WIND GUST OF 90 MPH;
BEATS OLD RECORD OF 76e MPH SET IN 1978
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DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR DECEMBER 30
HIGH 60 IN 1984
LOW -18 IN 1933
PRECIP 1.54 INS. IN 1942
SNOWFALL 7.5 INS. IN 1956
PEAK GUST 81 MPH WNW IN 1962
RECORDS FOR DECEMBER 31
HIGH 62 IN 1965
LOW -12 IN 1917
PRECIP 0.96 INS. IN 1906
SNOWFALL 7.5 INS. IN 2008
PEAK GUST 78 MPH NW IN 1990
TODAY’S REPORT PREPARED BY: Joshua Polen
