Tuesday, January 7, 2020

| January 7, 2020 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, JANUARY 7, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

QUIET AND COOL WITH INCREASING CLOUDS…

Another ho-hum day here at the observatory with light wind and
increasing cloud cover as we move through the early afternoon.

Visibility has been excellent today at 70 miles.

The high temperature today has been 37F. This is 3 degrees above
the daily normal maximum of 34F. The low since midnight is 29F,
which is 11 degrees above the normal low of 18F.

Today’s Observations:

7 A.M.
Weather: Scattered cirrostratus, thin broken cirrus, few stratocumulus
offshore distant NE-ESE and distant SSE-SSW
Temperature: 30F; Dew Point: 17F; Wind: WSW at 10 kts
Sea-level pressure: 30.04 ins. Hg, rising steadily
Visibility: 60 miles
6-hr Max temp: 32F
6-hr Min temp: 29F
24-hr Precip:   Trace
24-hr Snowfall: Trace
BHO SA 1155 250 SCT E300 –BKN 60 172/30/17/2410/004/ FEW SC OFFSHR
DSNT NE-ESE AND DSNT SSE-SSW/ 8/508 51017 70000 10032 20029

10 A.M.
Weather: Broken cirrocumulus, thin broken cirrus, few stratocumulus
distant W-N and offshore distant NE-ESE
Temperature: 33F; Dew Point: 21F; Wind: SW at 8 kts
Sea-level pressure: 30.07 ins. Hg, rising, then more slowly
Visibility: 70 miles
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 E200 BKN 250 –BKN 70 184/33/21/2208/007/ FEW SC DSNT W-N
AND OFFSHR DSNT NE-ESE/ 8/509 51012

1 P.M.
Weather: Broken cirrocumulus, thin broken cirrus, few stratocumulus
distant NW-NE-E
Temperature: 36F; Dew Point: 18F; Wind: W at 8 kts
Sea-level pressure: 30.01 ins. Hg, falling, then more rapidly
Visibility: 70 miles
6-hr Max temp: 37F
6-hr Min temp: 29F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
BHO SA 1755 E180 BKN 250 –BKN 70 161/36/18/2608/001/ FEW SC DSNT
NW-NE-E/ 8/509 58023 10037 20029

SUMMARY FOR MONDAY, JANUARY 6, 2020

TEMPERATURE (DEGREES F)
MAX…..33   NORMAL…..34
MIN…..23   NORMAL…..18
MEAN….28   NORMAL…..26

DEPARTURE FROM 30-YEAR NORMAL………………… +2
TOTAL DEPARTURE FOR THE MONTH…………………+56 [+9.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………37  DEPARTURE……. -2
TOTAL HEATING UNITS FOR THE MONTH…………..176  DEPARTURE…….-56
TOTAL HEATING UNITS FOR THE SEASON…………2427  DEPARTURE……-109
TOTAL HEATING UNITS LAST SEASON TO DATE…….2473  DEPARTURE…….-46

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..26 W   AT  8:49 P.M.
AERO…………………….21 W   AT  8:55 P.M.
ASOS…………………….25 W   AT  8:55 P.M.
DAVIS……………………27 W   AT  8:48 P.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….24 W   AT  8:54 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….20 W   AT  8:55 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………21 W   AT  8:47 P.M.
AVERAGE WIND SPEED AND DIRECTION………….. 7.7 SW
ASOS………………….. 8.2
DAVIS…………………. 7.8 WSW [235 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…TRACE  DEPARTURE……-0.14
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.30  DEPARTURE……-0.56
ASOS…………..0.31
TOTAL PRECIPITATION FOR THE YEAR………..0.30  DEPARTURE……-0.56
ASOS…………..0.31

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……..TRACE  DEPARTURE…….-0.5
TOTAL SNOWFALL FOR THE MONTH…………….0.5  DEPARTURE…….-2.8
TOTAL SNOWFALL FOR THE SEASON…………..20.5  DEPARTURE…….+1.2

PRELIMINARY CLIMATE SUMMARY FOR DECEMBER 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

12/01  32/16/24/-13/…./5.8/011/02           33 ENE AERO 32 ENE RMY N/A
12/02  37/25/31/-5/…./2.7/000/00            52 NE  AERO 47 NE  RMY 53
12/03  30/23/27/-9/…./4.6/000/00            32 N   AERO 35 N   RMY 36
12/04  34/22/28/-7/…./0.0/000/00            23 WNW AERO 23 NNW RMY N/A
12/05  41/26/34/-1/…./0.0/343/62            33 NW  AERO 35 NW  RMY 37
12/06  33/23/28/-7/0.02/0.1/000/00            25 NW  AERO 23 NW  RMY 29
12/07  31/18/25/-9/0.00/0.0/519/94            25 NW  AERO 23 NW  RMY N/A
12/08  36/15/26/-8/0.00/0.0/402/73            31 SSW AERO 32 SSW RMY N/A
12/09  57/36/47/+13/…./0.0/000/00           53 S   AERO 52 S   RMY 54
12/10  58/37/48/+15/…./0.0/044/08           35 SW  AERO 39 SW  RMY N/A
12/11  36/23/30/-3/…./3.0/236/43            25 NW  AERO 25 NW  RMY N/A
12/12  29/17/23/-10/…./1.8/488/89           29 W   AERO 30 W   RMY 25
12/13  46/22/34/+2/…./0.0/000/00            25 SSE AERO 25 SSE RMY N/A
12/14  58/46/52/+20/…./0.0/000/00           45 S   AERO 41 S   RMY N/A
12/15  48/28/38/+6/0.00/0.0/284/52            53 W   AERO 53 W   RMY 50
12/16  30/25/28/-3/0.00/0.0/000/00            36 W   AERO 36 W   RMY N/A
12/17  35/23/29/-2/…./1.0/000/00            22 NNW AERO 21 NE  RMY 23
12/18  33/18/26/-5/…/0.0/229/42             44 WNW AERO 45 WNW RMY N/A
12/19  20/9/15/-15/…/0.0/534/98             51 W   AERO 47 W   RMY N/A
12/20  29/11/20/-10/0.00/0.0/540/99           32 W   AERO 30 W   RMY 29
12/21  31/16/24/-6/0.00/0.0/163/30            16 SSE AERO 15 SSE RMY N/A
12/22  40/26/33/+4/0.00/0.0/212/39           23 SW  AERO 21 SW  RMY 23
12/23  54/33/44/+15/0.00/0.0/540/99          30 WSW AERO 30 SW  RMY 30
12/24  42/29/36/+7/0.00/0.0/507/93           30 NW  AERO 27 NW  RMY 30
12/25  42/25/34/+6/0.00/0.0/289/53           16 NNE AERO 16 N   RMY N/A
12/26  39/29/34/+6/0.00/0.0/174/32           22 ENE AERO 20 ENE RMY 22
12/27  47/31/39/+11/0.00/0.0/000/00          32 SSW AERO 30 SSW RMY 34
12/28  47/30/39/+11/0.00/0.0/470/86          23 W   AERO 22 W   RMY N/A
12/29  42/28/35/+8/…./0.0/383/70           22 WNW AERO 21 WNW RMY 23
12/30  36/32/34/+7/…./0.8/000/00           40 E   AERO 37 E   RMY 37
12/31  40/32/36/+9/…./0.0/000/00           35 E   AERO 32 E   RMY N/A

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  38/30/34/+7/…./0.0/…./..           39 W   AERO 38 W   RMY 41
01/02  46/29/38/+11/0.00/0.0/…./..          28 SW  AERO 28 SW  RMY 30
01/03  46/40/43/+17/0.00/0.0/…./..          21 SW  AERO 18 SW  RMY N/A
01/04  46/36/41/+15/…./0.0/…./..          16 NNW AERO 16 NNW RMY N/A
01/05  36/24/30/+4/…./0.5/…./..           43 NW  AERO 46 NW  RMY 43
01/06  33/23/28/+2/T/T/…./..                26 W   AERO 21 W   RMY N/A

01/07  The low since midnight is 29F, daily normal minimum is 18F

DAILY RECORDS FOR DECEMBER

12/01/19: DAILY RECORD SNOWFALL OF 5.8 INS.,
BREAKS PREVIOUS RECORD OF 2.0 INS. SET IN 1902.

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

RECORDS FOR JANUARY 7
HIGH 60F IN 1930
LOW -8F IN 2018
PRECIP 1.97 INS. IN 1977
SNOWFALL 16.0 INS. IN 1977
PEAK GUST 74 MPH NW IN 1968

RECORDS FOR JANUARY 8
HIGH 65F IN 2008
LOW -8F IN 1968
PRECIP 1.70 INS. IN 1958,1979
SNOWFALL 12.5 INS. IN 1996
PEAK GUST 77 MPH NNW IN 1958

TODAY’S REPORT PREPARED BY: Matt Douglas

Category: Daily Discussions

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