Wednesday, January 29, 2020

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, JANUARY 29, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

CLEAR AFTERNOON SKIES FOLLOWING A CLOUDY MORNING,
WITH A COOL NORTHERLY BREEZE….

Today we observed an overcast this morning that broke
apart before the 10 A.M. observation. Visibility has
been excellent throughout the day, being 85 miles on
average. Wind is northwesterly at 10 mph, gusting to
20 mph at most.

We continue to expand our rain and snowfall deficits for the
month. The rainfall total is 1.46 inches, 2.48 inches below
the average rain total. Snowfall for this month is considerably
low, amounting to only 4.2 inches. That is 11.3 inches below
the normal monthly snowfall total.

Despite consistent cold air advection from the northwest,
temperatures are slightly milder than seasonal averages.
The high so far today is 37F, 3 degrees above the normal high
of 34F. The low since midnight is 28F, 11 degrees above the
normal low of 17F.

Today’s Observations:

7 A.M.
Weather: Broken stratus
Temperature: 28F; Dew Point: 18F; Wind: NW at 11G17 kts
Sea-level pressure: 29.97 ins. Hg, rising steadily
Visibility: 80 miles
6-hr Max temp: 30F
6-hr Min temp: 28F
24-hr Precip:  Trace
24-hr Snowfall: Trace
BHO SA 1155 E35 BKN 80 150/28/18/3211G17/997/ 8/600 53020
10030 20028

10 A.M.
Weather: Few distant stratocumulus NE-S
Temperature: 31F; Dew Point: 17F; Wind: NW at 10G16 kts
Sea-level pressure: 30.02 ins. Hg, rising, then more slowly
Visibility: 85 miles
3-hr Precip:   0.00 ins.
3-hr Snowfall:  0.0 ins.
BHO SA 1455 CLR 85 167/31/17/3210G16/002/ FEW DSNT SC NE-S/
8/400 51017

1 P.M.
Weather: Few distant cumulus offshore
Temperature: 37F; Dew Point: 11F; Wind: W at 10 kts
Sea-level pressure: 30.01 ins. Hg, rising, then falling
Visibility: 85 miles
6-hr Max temp: 37F
6-hr Min temp: 28F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
BHO SA 1755 CLR 85 162/37/11/2810/001/ FEW DSNT CU OFFSHR/
8/100 58005 10037 20028

SUMMARY FOR TUESDAY, JANUARY 28, 2020

TEMPERATURE (DEGREES F)
MAX…..37   NORMAL…..34
MIN…..30   NORMAL…..17
MEAN….34   NORMAL…..25

DEPARTURE FROM 30-YEAR NORMAL…………………+9
TOTAL DEPARTURE FOR THE MONTH………………..+236 [+8.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………31  DEPARTURE……..-9
TOTAL HEATING UNITS FOR THE MONTH…………..873  DEPARTURE……-235
TOTAL HEATING UNITS FOR THE SEASON…………3124  DEPARTURE……-288
TOTAL HEATING UNITS LAST SEASON TO DATE…….3352  DEPARTURE……-228

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..25 NW  AT  9:08 A.M.
AERO…………………….25 NW  AT 10:18 A.M.
ASOS…………………….26 NW  AT  9:25 P.M.
DAVIS……………………25 NW  AT  9:23 P.M. RMY 27
FASTEST MILE FOR YESTERDAY………………….16 NW  AT  2:32 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….16 NW  AT 10:08 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………17 NW  AT  2:34 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..10.3 NW
ASOS…………………..10.6
DAVIS………………….10.6 NW [318 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……-2.48
ASOS…………..1.54
TOTAL PRECIPITATION FOR THE YEAR………..1.46  DEPARTURE……-2.48
ASOS…………..1.54

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……-11.3
TOTAL SNOWFALL FOR THE SEASON…………..24.2  DEPARTURE…….-7.3

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  43/33/38/+13/0.00/0.0/…./..          30 W   AERO 29 W   RMY 29
01/28  37/30/34/+9/0.00/0.0/…./..           25 NW  AERO 25 NW  RMY 27

01/29 The low since midnight is 28F, 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 29
HIGH 66F IN 2002
LOW -11F IN 1888
PRECIP 1.48 INS. IN 1973
SNOWFALL 8.0 INS. IN 1943
PEAK GUST 72 MPH NW IN 1973

RECORDS FOR JANUARY 30
HIGH 60F IN 1914
LOW -8F IN 1948
PRECIP 1.12 INS. IN 1925
SNOWFALL 6.5 INS. IN 1986
PEAK GUST 76 MPH WNW IN 1962

TODAY’S REPORT PREPARED BY: Benjamin Turner and Greg White