Monday, January 20, 2020

| January 20, 2020 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, JANUARY 20, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

PLENTY OF SUNSHINE TODAY, BUT VERY COLD AND DRY….

Despite the abundance of sunshine today, the air mass
over the region is of Arctic origin and is very cold.
Temperatures this morning were in the low teens, and
have only recovered to the mid 20s this afternoon.
Today will be a rare below normal day this month
(only the 4th). The dew point has been sitting in the
single digits indicating how extremely the dry the air is.

With the Arctic air mass, very clear air is in place
and has resulted in visibility of around 80 miles most
of the day.

The high so far today is 25F, 8 degrees below the normal
high of 33F. The low since midnight is 12F, this is 5
degrees below the normal low of 17F.

Today’s Observations:

7 A.M.
Weather: Broken altocumulus/altostratus, Stratocumulus
offshore distant NE-SE
Temperature: 12F; Dew Point: 5F; Wind: NW at 10G18 kts
Sea-level pressure: 30.07 ins. Hg, rising, then more rapidly
Visibility: 70 miles
6-hr Max temp: 18F
6-hr Min temp: 12F
24-hr Precip:  0.00 ins.
24-hr Snowfall: 0.0 ins.
Snow depth: 2 ins.
BHO SA 1155 E65 BKN 70 182/12/5/3210G18/007/ SC OFFSHR DSNT
NE-SE AND DSNT SSE-S VIRGA NW AND DSNT S/ 8/570 4/002 53039
10018 20012

10 A.M.
Weather: Clear, stratocumulus offshore distant NE-SE, few
altocumulus distant NE-E-SE, few cirrus distant NNE-NE
Temperature: 17F; Dew Point: 6F; Wind: NW at 10G19 kts
Sea-level pressure: 30.13 ins. Hg, rising, then more slowly
Visibility: 80 miles
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 CLR 80 203/17/6/3310G19/013/ SC OFFSHR DSNT NE-SE
FEW AC DSNT NE-E-SE FEW CI DSNT NNE-NE/ 8/571 51021

1 P.M.
Weather: Clear, stratocumulus offshore distant NE-SE
Temperature: 24F; Dew Point: 6F; Wind: NW at 12G18 kts
Sea-level pressure: 30.14 ins. Hg, rising, then steady
Visibility: 80 miles
6-hr Max temp: 24F
6-hr Min temp: 12F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
Snow depth: 2 ins
BHO SA 1755 CLR 80 205/24/6/3212G18/014/ SC OFFSHR DSNT NE-SE/
8/500 4/002 50002 10024 20012

SUMMARY FOR SUNDAY, JANUARY 19, 2020

TEMPERATURE (DEGREES F)
MAX…..40   NORMAL…..33
MIN…..21   NORMAL…..17
MEAN….31   NORMAL…..25

DEPARTURE FROM 30-YEAR NORMAL………………… +6
TOTAL DEPARTURE FOR THE MONTH………………..+172 [+8.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………34  DEPARTURE……. -6
TOTAL HEATING UNITS FOR THE MONTH…………..579  DEPARTURE……-169
TOTAL HEATING UNITS FOR THE SEASON…………2830  DEPARTURE……-222
TOTAL HEATING UNITS LAST SEASON TO DATE…….2990  DEPARTURE……-160

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..44 W   AT   4:36 P.M.
AERO…………………….44 W   AT   7:02 P.M.
ASOS…………………….43 WNW AT   4:37 P.M.
DAVIS……………………45 W   AT   4:35 P.M. RMY 42
FASTEST MILE FOR YESTERDAY………………….34 W   AT   4:53 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….29 W   AT   4:54 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………31 W   AT   4:52 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..14.5 W
ASOS…………………..14.8
DAVIS………………….14.2 WNW [288 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.14
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.89  DEPARTURE……-1.82
ASOS…………..0.89
TOTAL PRECIPITATION FOR THE YEAR………..0.89  DEPARTURE……-1.82
ASOS…………..0.89

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……… 0.0  DEPARTURE…….-0.5
TOTAL SNOWFALL FOR THE MONTH…………… 4.2  DEPARTURE…….-6.4
TOTAL SNOWFALL FOR THE SEASON…………..24.2  DEPARTURE…….-2.4

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  38/29/34/+8/…./0.4/…/..            30 WSW AERO 28 WSW RMY N/A
01/08  39/22/31/+5/…./0.4/…/..            50 W   AERO 46 WNW RMY 47
01/09  28/16/22/-4/…./0.0/…/..            43 WNW AERO 40 WNW RMY N/A
01/10  48/23/36/11/T/…./0.0/…/..          37 SW  AERO 37 SW  RMY 39
01/11  65/46/56/+31/…./0.0/…/..           53 SSW AERO 53 SSW RMY N/A
01/12  68/36/52/+27/…./0.0/…/..           60 SSW AERO 62 SSW RMY N/A
01/13  39/31/35/+10/0.01/T/…/..             21 NE  AERO 20 NE  RMY N/A
01/14  38/31/35/+10/0.01/0.0/…/..           16 W   AERO 15 W   RMY N/A
01/15  48/35/42/+17/0.00/0.0/…/..           24 W   AERO 23 W   RMY 24
01/16  42/24/33/+8/0.06/T/…/..              54 W   AERO 52 W   RMY 59
01/17  24/10/17/-8/0.00/0.0/…./..           50 NW  AERO 48 NW  RMY N/A
01/18  28/8/18/-7/0.35/2.8/…./..            28 WSW AERO 24 ESE RMY N/A
01/19  40/21/31/+6/0.02/0.2/…./..           44 W   AERO 44 W   RMY 42

01/19 The low since midnight is 12F, daily normal minimum is 17F

DAILY RECORDS FOR JANUARY

1/11/20: DAILY RECORD MAXIMUM TEMPERATURE OF 65F,
BREAKS PREVIOUS RECORD OF 60F SET IN 1975.

1/11/20: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 46F,
BREAKS PREVIOUS RECORD OF 40F SET IN 1983.

1/12/20: DAILY RECORD MAXIMUM TEMPERATURE OF 68F,
BREAKS PREVIOUS RECORD OF 60 SET IN 2018.
TIES HIGHEST MAXIMUM FOR JANUARY,
ADDITIONAL 68F ON 1/26/1950.

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

RECORDS FOR JANUARY 20
HIGH 59F IN 1951
LOW -9F IN 1901
PRECIP 1.95 INS. IN 1978
SNOWFALL 19.0 INS. IN 1978
PEAK GUST 76e MPH NE IN 1978

RECORDS FOR JANUARY 21
HIGH 65F IN 1906
LOW -4F IN 1888,1893
PRECIP 2.49 INS. IN 1979
SNOWFALL 9.0 INS. IN 2014
PEAK GUST 78e MPH SE IN 1979

TODAY’S REPORT PREPARED BY: Matt Douglas

Category: Daily Discussions

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