Monday, January 27, 2020

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, JANUARY 27, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

MOSTLY CLOUDY, BREEZY, AND CHILLY ATOP GREAT BLUE HILL….

Overall fair weather continues today despite an abundance
of cloud cover. Areas of virga were seen this morning as
well. A busy westerly breeze has been occurring, picking up a bit
as we’ve moved into the afternoon. A peak gust of 28 mph has
occurred so far. Visibility has been decent today, running between
60 and 70 miles.

Topics of concern are the rain and snowfall amounts for this
month. The rainfall total is 1.46 inches, 2.21 inches below
the average rain total. Snowfall for this month is considerably
low, amounting to only 4.2 inches. That is 10.3 inches below
the normal monthly snowfall total.

The high so far today is 42F, 8 degrees above the normal high
of 34F. The low since midnight is 33F, 16 degrees above the
normal low of 17F.

Today’s Observations:

7 A.M.
Weather: Broken altostratus, broken altocumulus, virga all
quadrants
Temperature: 34F; Dew Point: 29F; Wind: WSW at 9 kts
Sea-level pressure: 29.62 ins. Hg, steady
Visibility: 60 miles
6-hr Max temp: 35F
6-hr Min temp: 33F
24-hr Precip:  0.00 ins.
24-hr Snowfall: 0.0 ins.
BHO SA 1155 E65 BKN 90 BKN 60 030/34/29/2509/962/
VIRGA ALQDS/ 8/020 55001 10035 20033

10 A.M.
Weather: Overcast altostratus, breaks in overcast W-N and
ESE-S, few stratocumulus distant W-NW-NNE and distant S,
virga SSE
Temperature: 37F; Dew Point: 27F; Wind: W at 9G16 kts
Sea-level pressure: 29.62 ins. Hg, steady, then falling
Visibility: 70 miles
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 E65 OVC 70 029/37/27/2609G16/962/ BINOVC W-N
AND ESE-S FEW SC DSNT W-NW-NNE AND DSNT S VIRGA SSE/ 8/52/
58001

1 P.M.
Weather: Broken cumulus, broken altocumulus
Temperature: 41F; Dew Point: 25F; Wind: W at 12G24 kts
Sea-level pressure: 29.57 ins. Hg, falling, then more rapidly
Visibility: 60 miles
6-hr Max temp: 42F
6-hr Min temp: 34F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
BHO SA 1755 E30 BKN 90 BKN 60 013/41/25/2712G24/957/ 8/220
58016 10042 20034

SUMMARY FOR SUNDAY, JANUARY 26, 2020

TEMPERATURE (DEGREES F)
MAX…..49   NORMAL…..34
MIN…..35   NORMAL…..17
MEAN….42   NORMAL…..25

DEPARTURE FROM 30-YEAR NORMAL…………………+17
TOTAL DEPARTURE FOR THE MONTH………………..+214 [+8.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………23  DEPARTURE…….-17
TOTAL HEATING UNITS FOR THE MONTH…………..815  DEPARTURE……-213
TOTAL HEATING UNITS FOR THE SEASON…………3066  DEPARTURE……-267
TOTAL HEATING UNITS LAST SEASON TO DATE…….3284  DEPARTURE……-218

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..33 W   AT  1:47 P.M.
AERO…………………….31 W   AT  1:47 P.M.
ASOS…………………….31 W   AT  3:48 P.M.
DAVIS……………………33 W   AT  1:03 P.M. RMY 32
FASTEST MILE FOR YESTERDAY………………….26 W   AT  1:50 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….25 W   AT  1:49 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………27 W   AT  1:48 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..14.3 W
ASOS…………………..13.8
DAVIS………………….14.8 W [266 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.13
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….1.46  DEPARTURE……-2.21
ASOS…………..1.54
TOTAL PRECIPITATION FOR THE YEAR………..1.46  DEPARTURE……-2.21
ASOS…………..1.54

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE…….-0.6
TOTAL SNOWFALL FOR THE MONTH…………….4.2  DEPARTURE……-10.3
TOTAL SNOWFALL FOR THE SEASON…………..24.2  DEPARTURE…….-6.3

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
01/20  26/12/19/-6/0.00/0.0/…./..           33 NW  AERO 32 NW  RMY N/A
01/21  24/10/17/-8/0.00/0.0/…./..           22 NW  AERO 21 NW  RMY N/A
01/22  34/13/24/-1/0.00/0.0/…./..           16 SW  AERO 16 SW  RMY N/A
01/23  46/26/36/+11/0.00/0.0/…./..          21 SW  AERO 20 SW  RMY 19
01/24  44/31/38/+13/0.00/0.0/…./..          21 ENE AERO 17 ENE RMY N/A
01/25  50/36/43/+18/0.57/0.0/…./..          41 ESE AERO 41 ESE RMY 40
01/26  49/35/42/+17/0.00/0.0/…./..          33 W   AERO 31 W   RMY 32

01/27 The low since midnight is 33F, 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 TEMPERATURE FOR JANUARY,
MATCHES 68F SET ON 1/26/1950.

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

RECORDS FOR JANUARY 27
HIGH 63F IN 1974
LOW -12F IN 1924
PRECIP 1.59 INS. IN 1996
SNOWFALL 25.2 INS. IN 2015 [RECORD FOR MONTH] PEAK GUST 91 MPH SSE IN 1996

RECORDS FOR JANUARY 28
HIGH 59F IN 1916
LOW -9F IN 1888, 1924
PRECIP 2.18 INS. IN 1897
SNOWFALL 15.0 INS. IN 1897
PEAK GUST 78e MPH SSE IN 1977

TODAY’S REPORT PREPARED BY: Matt Douglas and Ann Murphy