Monday, December 2, 2024

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

MONDAY, DECEMBER 2, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0655E
SUNSET:  1612E

COLD AND DRY START TO DECEMBER; PLENTY OF SUNSHINE ON THIS MONDAY….

Despite the beautifully deep blue skies and a boat load of sunshine,
the air is quite chilly again today, even for early December standards.
This morning featured the coldest temperatures so far this season
with a low of 22F. We have recovered to the mid 30s so far early this
afternoon, which is around 7 degrees below normal for the date!

The dew point started the day in the mid teens, but has risen to the
low 20s early this afternoon. Either way, the air mass is quite dry
and is contributing to the added chill to the air.

We observed a decent, but thin layer of ice on Ponkapoag pond this
morning as a result of the recent cold snap. So far no signs of ice
on Houghton’s, which is deeper and takes a bit longer to cool off.

Winds were fairly steady through the morning, but are trending downward
as we push through the early afternoon hours. The average speed for the
day so far is around 10mph, but has been generally around 6-7mph for the
past couple of hours. The peak gust for the day thus far is 18mph,
which occurred at 3:34am this morning.

Visibility has been decent all day, holding at around 60 miles.

The maximum temperature for today is 37F degrees, which is 7 degrees
below the normal high of 44F. The minimum temperature since midnight
is 22F degrees, which is 7 degrees below the normal low of 29F.

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PRELIMINARY STATS FOR NOVEMBER 2024

TEMPERATURE, Deg. F
Avg. Max. 54.6 [+4.5] Avg. Min. 37.4 [+3.6] Mean      46.0 [+4.0] 24-hour corrected mean: 45.8
Max. for month: 80F on the 6th
Min. for month: 26F on the 30th

HEATING DEGREE DAYS
Total heating units:    570 [-122] Total for the season:   943 [-261] Total for last season: 1087

COOLING DEGREE DAYS
Total cooling units:      5 [+005] Total for the season:   768 [+091] Total for last season:  715

PRECIPITATION, Inches
Total: 3.67 [-0.64] Greatest in 24 hrs: 1.61 on the 21st-22nd

SNOWFALL, Inches
Total: 0.0 [-1.8] Greatest in 24 hrs: 0.0 on the N/A

WIND, mph
Avg. uncorrected wind speed: 12.5 mph
Avg. corrected wind speed:   12.9 mph
Prevailing wind direction:   Northwest [22%] Peak gust and direction:  52 WNW on the 24th

SUNSHINE:
Campbell-Stokes card minutes: 12282 of a possible 17010, or 72%
Astronomical total minutes: 12709 of a possible 17592 or 72%

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Today’s Observations:

7 A.M.
Weather: Clear, few stratocumulus/cumulus offshore distant NE-ESE and
distant SE-SSW
Temperature: 22F; Dew Point: 16F; Relative Humidity: 77%
Wind: W @ 10 kts
Sea-level pressure: 1018.6 mb; 30.08 in. Hg: rising unsteadily
Visibility: 60 miles
6-hr Max temp: 25F
6-hr Min temp: 22F
24-hr Precip:  0.00 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 CLR 60 186/22/16/2810/008/ FEW SC/CU OFFSHR DSNT NE-ESE
AND DSNT SE-SSW/ 8/800 52007 10025 20022

10 A.M.
Weather: Clear, few stratocumulus distant W-NNW, few stratocumulus/
cumulus offshore distant NE-ESE and distant SE-S, few cirrus distant SW-WNW
Temperature: 31F; Dew Point: 20F; Relative Humidity: 63%
Wind: NW @ 7 kts
Sea-level pressure: 1019.7 mb; 30.11 in. Hg: rising, then steady
Visibility: 60 miles
3-hr Precip:  0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 CLR 60 197/31/20/3107/011/ FEW SC DSNT W-NNW FEW SC/CU
OFFSHR DSNT NE-ESE AND DSNT SE-S FEW CI DSNT SW-WNW/ 8/801 51011

1 P.M.
Weather: Clear, few stratocumulus all quadrants
Temperature: 36F; Dew Point: 21F; Relative Humidity: 53%
Wind: NW @ 6 kts, wind light
Sea-level pressure: 1018.4 mb; 30.07 in. Hg: falling unsteadily
Visibility: 60 miles
6-hr Max temp: 37F
6-hr Min temp: 22F
6-hr Precip:  0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 CLR 60 184/36/21/3206/007/ FEW SC ALQDS WND LGT/
8/500 57013 10037 20022

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SUMMARY FOR SUNDAY, DECEMBER 1, 2024

TEMPERATURE (DEGREES F)
MAX…….37  NORMAL…..45
MIN…….23  NORMAL…..29
MEAN……30  NORMAL…..37

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………..-7
TOTAL DEPARTURE FOR THE MONTH……………………..-7 [-7.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY……………35  DEPARTURE……..+7
TOTAL HEATING UNITS FOR THE MONTH……………35  DEPARTURE……..+7
TOTAL HEATING UNITS FOR THE SEASON………….978  DEPARTURE……-254
TOTAL HEATING UNITS LAST SEASON TO DATE…….1107  DEPARTURE……-129

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

F420C (Official)………..21 WSW  @   09:42 A.M.
VECTOR #1 (1-Sec)……….21 WSW  @   09:40 A.M.
VECTOR #2 (1-Sec)……….21 W    @   10:54 P.M.
DAVIS #1……………….20 WSW  @   05:09 A.M.
DAVIS #2 ………………20 W    @   05:14 A.M.
RMY #1 (Instantaneous)…..21 SW   @   02:10 P.M.
RMY #2 (Instantaneous)…..21 W    @   06:26 A.M.
MERLIN………………….M
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………16 W    @   10:40 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..15      @   10:59 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..16      @   11:01 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………15 W    @   10:59 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………16 WNW  @   11:01 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..14 WSW  @   09:41 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..16 W    @   11:00 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..10.3 WSW [246 total miles] VECTOR #1………………10.3
VECTOR #2………………10.6
DAVIS #1……………….10.6 WSW
DAVIS #2……………….10.7 W
RMY #1…………………10.0 WSW
RMY #2…………………10.5 WSW
RICHARDS (C5C)…………..OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.18
TOTAL PRECIPITATION FOR THE MONTH…………..0.00 DEPARTURE…..-0.18
TOTAL PRECIPITATION FOR THE YEAR (2024)…….47.47 DEPARTURE…..-1.18

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……-0.2
TOTAL SNOWFALL FOR THE MONTH………………..0.0 DEPARTURE……-0.2
TOTAL SNOWFALL FOR THE SEASON (2024-2025)…….0.0 DEPARTURE……-2.7

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PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER 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

11/1   77/49/63/+16/0.00/0.0/347/56       36 WNW VEC1 36 WNW RMY 37
11/2   55/37/46/-1/0.00/0.0/228/37        21 N   VEC1 23 N   RMY 21
11/3   48/30/39/-7/0.00/0.0/595/97        20 NNW VEC1 21 NNW RMY 21
11/4   49/33/41/-5/0.00/0.0/061/10        20 SSE VEC1 21 SSE RMY 21
11/5   73/46/60/+14/0.00/0.0/505/83       35 SW  VEC1 35 SW  RMY 37
11/6   80/59/70/+25/0.00/0.0/558/92       39 WSW VEC1 39 WSW RMY 42
11/7   69/47/58/+13/0.00/0.0/519/86       37 WNW VEC1 35 WNW RMY 42
11/8   63/41/52/+7/0.00/0.0/572/95        42 WNW VEC1 42 WNW RMY 47
11/9   50/36/43/-1/0.00/0.0/599/100       40 NW  VEC1 42 NW  RMY 43
11/10  60/32/46/+2/T/0.0/388/65           29 WSW VEC1 29 SW  RMY 31
11/11  66/50/58/+15/0.08/0.0/457/77       40 SW  VEC1 42 SW  RMY 43
11/12  54/33/44/+1/0.00/0.0/545/92        48 NNW VEC1 50 NNW RMY 56
11/13  43/28/36/-7/0.00/0.0/584/99        32 N   VEC1 33 N   RMY 31
11/14  42/27/35/-7/0.00/0.0/542/92        22 NE  VEC1 22 NE  RMY 22
11/15  58/27/43/+1/0.00/0.0/580/99        28 NW  VEC1 28 NW  RMY 30
11/16  60/38/49/+7/0.00/0.0/572/98        33 NNW VEC1 35 NNW RMY 35
11/17  62/40/51/+10/0.00/0.0/553/95       26 NW  VEC1 26 NW  RMY 26
11/18  61/43/52/+11/T/0.0/418/72          29 NW  VEC1 28 NW  RMY 31
11/19  56/39/48/+7/0.00/0.0/565/98        29 NW  VEC1 29 NW  RMY 30
11/20  52/36/44/+4/T/0.0/564/98           21 E   VEC1 21 E   RMY 21
11/21  44/43/44/+4/1.27/0.0/000/00        51 ENE VEC1 50 ENE RMY 52
11/22  52/40/46/+6/0.55/0.0/372/65        44 E   VEC1 47 E   RMY 45
11/23  44/38/41/+2/0.71/0.0/000/00        46 NW  VEC1 45 NW  RMY 49
11/24  48/35/42/+3/0.00/0.0/523/92        52 WNW VEC1 53 WNW RMY 53
11/25  49/32/41/+2/0.00/0.0/556/98        33 WNW VEC1 34 WNW RMY 34
11/26  44/35/40/+2/0.37/0.0/062/11        28 WNW VEC1 29 NW  RMY 28
11/27  49/33/41/+3/0.00/0.0/513/91        25 W   VEC1 25 W   RMY 25
11/28  45/36/41/+3/0.69/0.0/000/00        35 NW  VEC1 35 NW  RMY 35
11/29  44/32/38/0/0.00/0.0/410/73         36 WNW VEC1 36 WNW RMY 37
11/30  40/26/33/-4/0.00/0.0/521/93        23 W   VEC1 23 W   RMY 23

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NOVEMBER DAILY RECORDS TO DATE

11/1 RECORD HIGH TEMPERATURE OF 77F, OLD RECORD WAS 75F IN 2003.

11/6 RECORD HIGH TEMPERATURE OF 80F, OLD RECORD WAS 74F IN 2022.

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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   37/23/30/-7/0.00/0.0/…/..        21 WSW VEC1 21 WSW RMY 21

12/2 The low since midnight is 22F, the daily normal low is 29F.

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DECEMBER 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 DECEMBER 2
HIGH 61 IN 1998
LOW 3 IN 1890
PRECIP 2.09 INS. IN 1974
SNOWFALL 5.0 INS. IN 1894, 1929
PEAK GUST 89e MPH SSE IN 1942

RECORDS FOR DECEMBER 3
HIGH 67 IN 2009
LOW  -1 IN 1890
PRECIP 2.10 INS. IN 1986
SNOWFALL 6.0 INS. IN 1963
PEAK GUST 73e MPH W IN 1942

TODAY’S REPORT PREPARED BY: Matt Douglas