Friday, February 7, 2020

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, FEBRUARY 7, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

CHILLY, WET, AND FOGGY WEATHER CONTINUES ATOP GREAT
BLUE HILL…

We received more beneficial precipitation overnight clocking in
at 0.33 inches. This was in the form of rain. Winds briefly
switched over to the north overnight allowing temperatures to dip
just slightly below freezing, and with that came some very minor
ice accretion at the 7AM observation – it quickly melted away however
as temperatures rose above 32F shortly thereafter.

Visibility was predominantly 1/16th of a mile in very soggy and raw
conditions – light rain, chilly temperatures, thick fog and generally
light winds. The max gust by the 1PM observation was 31 MPH
(escalating quickly though to 55 MPH around 2PM post-observation time
as a warm front punched through -it also brought a ceasing of rainfall,
pokes of sun, warming temperatures, and increasing visibility!).

The high so far today is 45F, 10 degrees above the normal high
of 35F. The low since midnight is 31F, 13 degrees above the normal
low of 18F.

PRELIMINARY STATS FOR JANUARY 2020

TEMPERATURE, Deg. F
Avg. Max. 40.6 [+6.8] Avg. Min. 25.9 [+8.8] Mean      33.3 [+7.8] 24-hour corrected mean: 32.8
Max. for month: 68F on the 12th
Min. for month: 8F on the 18th

HEATING DEGREE DAYS
Total heating units:    978 [-248] Total for the season:  3229 [-302] Total for last season: 3495

PRECIPITATION, Inches
Total: 1.46 [-2.89] Greatest in 24 hrs: N/A

SNOWFALL, Inches
Total: 4.2 [-12.9] Greatest in 24 hrs: 3.0 ins. on the 18th-19th

WIND, mph
Avg. uncorrected wind speed: 12.3 mph
Avg. corrected wind speed:   12.8 mph
Prevailing wind direction:   W [19%] Peak gust and direction:     60 SSW on the 12th

SUNSHINE:
Campbell-Stokes card minutes: 8388 minutes of possible 17130 or 49%
Astronomical total minutes: 8642 minutes of possible 17639 or 49%

JANUARY 2020 RANKED 9TH WARMEST ON RECORD!
Warmest 24-Hour Adjusted Mean Temperature, deg F (1886-2020):

1) 35.6 in 1913
2) 35.0 in 1932
3) 34.6 in 1937
4) 33.9 in 2006
5) 33.8 in 1933
33.8 in 1950
33.8 in 1990
8) 33.5 in 2002
9) 32.8 in 2020
10) 32.7 in 2017

Today’s Observations:

7 A.M.
Weather: Vertical visibility 300 ft, sky obscured, light drizzle,
thin glaze on surfaces
Temperature: 32F; Dew Point: 32F; Wind: E at 13 kts
Sea-level pressure: 29.22 ins. Hg: falling unsteadily
Visibility: 1/8 mile, fog
6-hr Max temp: 32F
6-hr Min temp: 31F
24-hr Precip:  0.33 ins.
24-hr Snowfall: Trace
BHO SA 1155 W3 X 1/8L-F 895/32/32/0813/922/ L-CTD THN GLZ
NEW SNOW PST 24 HRS TRACE/ 8//// 70033 57059 10032 20031

10 A.M.
Weather: Vertical visibility 300 ft, sky obscured, light rain
Temperature: 35F; Dew Point: 35F; Wind: NE at 10G17 kts
Sea-level pressure: 29.11 ins. Hg: falling, then falling more rapidly
Visibility: 1/16 mile, fog
3-hr Precip:   0.06 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 W3 X 1/16R-F 857/35/35/0410G17/911/
R-CTD/ 8//// 6006/ 58038

1 P.M.
Weather: Vertical visibility 300 ft, sky obscured, light rain
Temperature: 45F; Dew Point: 45F; Wind: SE at 9 kts
Sea-level pressure: 28.81 ins. Hg: falling very rapidly
Visibility: 1/16 mile, fog
6-hr Max temp: 45F
6-hr Min temp: 32F
6-hr Precip:  0.21 ins.
6-hr Snowfall: 0.0 ins.
BHO SA 1755 W3 X 1/16R-F 757/45/45/1309/881/ R-CTD PRESFR/
8//// 6021/ 58100 10045 20032

SUMMARY FOR THURSDAY, FEBRUARY 6, 2020

TEMPERATURE (DEGREES F)
MAX…..37   NORMAL…..35
MIN…..30   NORMAL…..18
MEAN….34   NORMAL…..26

DEPARTURE FROM 30-YEAR NORMAL………………..+8
TOTAL DEPARTURE FOR THE MONTH……………….+58 [+9.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………31  DEPARTURE……..-8
TOTAL HEATING UNITS FOR THE MONTH…………..176  DEPARTURE…….-58
TOTAL HEATING UNITS FOR THE SEASON…………3405  DEPARTURE……-360
TOTAL HEATING UNITS LAST SEASON TO DATE…….3690  DEPARTURE……-285

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..29 E AT  10:30 A.M.
AERO…………………….28 E AT  10:28 A.M.
ASOS…………………….27 E AT  10:30 A.M.
DAVIS……………………29 E AT  10:29 A.M. RMY 27
FASTEST MILE FOR YESTERDAY………………….21 E AT  10:31 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….20 E AT  10:31 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………22 E AT  10:30 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..12.3 E
ASOS…………………..12.6
DAVIS………………….12.2 E [83 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.33  DEPARTURE……+0.20
ASOS…………..0.26
TOTAL PRECIPITATION FOR THE MONTH……….0.73  DEPARTURE……-0.08
ASOS…………..0.69
TOTAL PRECIPITATION FOR THE YEAR………..2.19  DEPARTURE……-2.97
ASOS…………..2.23

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………T  DEPARTURE…….-0.5
TOTAL SNOWFALL FOR THE MONTH…………….0.1  DEPARTURE…….-2.9
TOTAL SNOWFALL FOR THE SEASON…………..24.3  DEPARTURE……-11.8

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/…./0.0/400/73           39 W   AERO 38 W   RMY 41
01/02  46/29/38/+11/0.00/0.0/269/49          28 SW  AERO 28 SW  RMY 30
01/03  46/40/43/+17/0.00/0.0/000/00          21 SW  AERO 18 SW  RMY N/A
01/04  46/36/41/+15/…./0.0/000/00          16 NNW AERO 16 NNW RMY N/A
01/05  36/24/30/+4/…./0.5/116/21           43 NW  AERO 46 NW  RMY 43
01/06  33/23/28/+2/T/T/133/24                26 W   AERO 21 W   RMY N/A
01/07  38/29/34/+8/…./0.4/161/29           30 WSW AERO 28 WSW RMY N/A
01/08  39/22/31/+5/…./0.4/350/63           50 W   AERO 46 WNW RMY 47
01/09  28/16/22/-4/…./0.0/540/97           43 WNW AERO 40 WNW RMY N/A
01/10  48/23/36/+11/T/…./0.0/106/19        37 SW  AERO 37 SW  RMY 39
01/11  65/46/56/+31/…./0.0/408/73          53 SSW AERO 53 SSW RMY N/A
01/12  68/36/52/+27/…./0.0/297/53          60 SSW AERO 62 SSW RMY N/A
01/13  39/31/35/+10/0.01/T/000/00            21 NE  AERO 20 NE  RMY N/A
01/14  38/31/35/+10/0.01/0.0/000/00          16 W   AERO 15 W   RMY N/A
01/15  48/35/42/+17/0.00/0.0/503/89          24 W   AERO 23 W   RMY 24
01/16  42/24/33/+8/0.06/T/142/25             54 W   AERO 52 W   RMY 59
01/17  24/10/17/-8/0.00/0.0/552/97           50 NW  AERO 48 NW  RMY N/A
01/18  28/8/18/-7/0.35/2.8/000/00            28 WSW AERO 24 ESE RMY N/A
01/19  40/21/31/+6/0.02/0.2/332/58           44 W   AERO 44 W   RMY 42
01/20  26/12/19/-6/0.00/0.0/442/77           33 NW  AERO 32 NW  RMY N/A
01/21  24/10/17/-8/0.00/0.0/472/82           22 NW  AERO 21 NW  RMY N/A
01/22  34/13/24/-1/0.00/0.0/566/98           16 SW  AERO 16 SW  RMY N/A
01/23  46/26/36/+11/0.00/0.0/348/60          21 SW  AERO 20 SW  RMY 19
01/24  44/31/38/+13/0.00/0.0/524/90          21 ENE AERO 17 ENE RMY N/A
01/25  50/36/43/+18/0.57/0.0/000/00         41 ESE AERO 41 ESE RMY 40
01/26  49/35/42/+17/0.00/0.0/346/59         33 W   AERO 31 W   RMY 32
01/27  43/33/38/+13/0.00/0.0/106/18         30 W   AERO 29 W   RMY 29
01/28  37/30/34/+9/0.00/0.0/030/05          25 NW  AERO 25 NW  RMY 27
01/29  38/23/31/+6/0.00/0.0/522/88          24 N   AERO 23 N   RMY 24
01/30  34/16/25/-1/0.00/0.0/547/92          17 NNW AERO 16 NNW RMY N/A
01/31  43/24/34/+8/0.00/0.0/430/72          22 S   AERO 21 S   RMY 22

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.

PRELIMINARY CLIMATE SUMMARY FOR FEBRUARY 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

02/01  38/30/34/+8/0.01/T/…./..          14 WSW AERO 14 WSW RMY N/A
02/02  40/30/35/+9/0.00/0.0/…./..        18 W   AERO 18 WNW RMY 18
02/03  44/27/36/+10/0.00/0.0/…./..       28 W   AERO 28 W   RMY 28
02/04  44/33/39/+13/0.00/0.0/…./..       19 E   AERO 16 E   RMY 18
02/05  41/30/36/+10/0.00/0.0/…./..       20 NNW AERO 19 NNW RMY N/A
02/06 31/30/34/+8/0.00/0.0/…./..         29 E   AERO 28 E   RMY 27

02/07 The low since midnight is 31F, daily normal minimum is 18F

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

RECORDS FOR FEBRUARY 7
HIGH 51F IN 1951,1953
LOW -8F IN 1910
PRECIP 2.12 INS. IN 1983
SNOWFALL 17.1 INS. IN 1978 [BLIZZARD OF 1978] PEAK GUST 87e MPH SSE IN 1951

RECORDS FOR FEBRUARY 8
HIGH 60F IN 1933
LOW -9F IN 1934
PRECIP 2.50 INS. IN 1945
SNOWFALL 16.1 INS. IN 2013
PEAK GUST 63e MPH NE IN 1945, 2013

TODAY’S REPORT PREPARED BY: Andrew Swanson