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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, FEBRUARY 12, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

OVERCAST AND DRY IN THE MORNING LEADING TO
A SNOWY AFTERNOON....

We observed good visibility and overcast skies
this morning, with light snow beginning shortly
before the 1 P.M. observation. Snow intensity 
increased since then, and visibility has dropped 
to a half mile. Wind has shifted from north to 
east, but has remained relatively light at around
10 mph. The high temperature so far today is 25F, 
11 degrees below our normal maximum temperature 
of 36F. The low since midnight was 13F, 5 degrees 
below our normal low of 18F.   


PRELIMINARY STATS FOR JANUARY 2019

TEMPERATURE, Deg. F
Avg. Max. 34.3 [+0.5]
Avg. Min. 17.9 [+0.8]
Mean      26.1 [+0.6]
24-hour corrected mean: 26.6
Max. for month: 57F on  24th
Min. for month: -2F on the 21st and 31st

HEATING DEGREE DAYS
Total heating units:   1200 [-26]
Total for the season:  3496 [-35]
Total for last season: 3321

PRECIPITATION, Inches
Total: 5.35 [+1.00]
Greatest in 24 hrs: 2 inches on the 19th-20th

SNOWFALL, Inches
Total: 4.7 [-12.4]
Greatest in 24 hrs: 4.2 inches on the 19th-20th 

WIND, mph
Avg. uncorrected wind speed: 13.4
Avg. corrected wind speed: 13.7
Prevailing wind direction: NW at 19%
Peak gust and direction: 77 S on 24th  

SUNSHINE:
Campbell-Stokes card minutes: 8988 minutes of possible 17130 or 52%
Astronomical total minutes:   9273 minutes of possible 17650 or 53%

BHO Coldest January Daily Maximum Temperature, deg F (1885-2019):

1) -1 on January 28, 1888
2) 1 on January 12, 1886
3) 2 on January 8, 1968
4) 3 on January 6, 1896
   3 on January 4, 1904
   3 on January 21, 2019
7) 4 on January 17, 1907
   4 on January 24, 1907
   4 on January 16, 1994


Today's Observations:

7 A.M.
Weather: Broken cirrocumulus
Temperature: 14F; Dew Point: 0F; Wind: N at 7G15 kts
Sea-level pressure: 30.47 ins. Hg, rising then falling
Visibility: 80 miles
6-hr Max temp: 20F
6-hr Min temp: 13F
24-hr Precip: 0.00 ins.
24-hr snowfall: 0.0 ins
Snow depth: 0 ins. 
BHO SA 1155 E250 BKN 80 317/14/0/0107G15/047/ 
8/009 51003 10020 20013 

10 A.M.
Weather: Overcast altostratus
Temperature: 21F; Dew Point: 12F; Wind: NE at 10G16 kts
Sea-level pressure: 30.44 ins. Hg, falling steadily
Visibility: 75 miles
3-hr Precip: 0.00 ins. 
BHO SA 1455 E65 OVC 75 309/21/12/0510G16/044/ 
8/02/ 58005

1 P.M.
Weather: Overcast nimbostratus, light snow
Temperature: 25F; Dew Point: 21F; Wind: E at 12G12 kts
Sea-level pressure: 30.40 ins. Hg, falling steadily
Visibility: 35 miles, distant fog
6-hr Max temp: 25F
6-hr Min temp: 14F
6-hr Precip:  Trace
6-hr snowfall: Trace 
Snow depth: Trace
BHO SA 1755 E65 OVC 35 294/25/21/0912G12/040/ 
DSNT FG ALQDS S-B30/ 8/02/ 600// 58015 10025 20014


SUMMARY FOR MONDAY, FEBRUARY 11, 2019 

TEMPERATURE (DEGREES F)
MAX.....34   NORMAL.....36
MIN.....21   NORMAL.....18
MEAN....28   NORMAL.....27

DEPARTURE FROM 30-YEAR NORMAL........................+1
TOTAL DEPARTURE FOR THE MONTH.......................+57 [+5.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............37   DEPARTURE.........-1
TOTAL HEATING UNITS FOR THE MONTH.............367   DEPARTURE........-58
TOTAL HEATING UNITS FOR THE SEASON...........3863   DEPARTURE........-93
TOTAL HEATING UNITS LAST SEASON TO DATE......3712   DIFFERENCE......+151

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................24 NNW AT  9:16 P.M.
                   AERO.........................23 NNW AT  9:14 P.M.
                   ASOS.........................24 N   AT  9:16 P.M. 
                   DAVIS........................25 NNW AT  9:16 P.M. RMY 25
FASTEST MILE FOR YESTERDAY......................18 NNW AT 10:56 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...................17 NNW AT 10:55 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................18 NNW AT 10:50 P.M.
AVERAGE WIND SPEED AND DIRECTION...............8.1 NNW
                   ASOS........................8.6
                   DAVIS.......................8.2 NNW [339 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..........0.77  DEPARTURE.......-0.72
                         ASOS..............0.72
TOTAL PRECIPITATION FOR THE YEAR...........6.12  DEPARTURE.......+0.28
                         ASOS..............6.20

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE........-0.5
TOTAL SNOWFALL FOR THE MONTH................0.0  DEPARTURE........-5.4
TOTAL SNOWFALL FOR THE SEASON..............12.4  DEPARTURE.......-26.1

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 54/29/42/+15/0.37/0.0/386/72         53 W   AERO 53 W   RMY 54
01/02 34/24/29/+2/0.00/T/432/81            22 NW  AERO 22 NW  RMY N/A
01/03 42/28/35/+9/0.01/0.0/228/43          28 WNW AERO 30 WNW RMY 30
01/04 43/30/37/+11/0.00/0.0/354/66         29 SW  AERO 29 SW  RMY 29
01/05 41/32/37/+11/1.15/T/000/00           26 NE  AERO 25 NNW RMY 27
01/06 42/21/32/+6/0.00/T/300/56            42 NW  AERO 46 NW  RMY 50
01/07 26/14/20/-6/0.00/0.0/474/88          37 NW  AERO 41 NW  RMY N/A
01/08 40/24/32/+6/0.02/T/000/00            24 SSE AERO 23 SSE RMY N/A
01/09 42/31/37/+11/0.11/0.0/084/16         44 W   AERO 46 WNW RMY 45
01/10 32/20/26/+1/T/T/090/17               37 NW  AERO 41 NW  RMY 43
01/11 26/12/19/-6/0.00/0.0/366/68          36 WNW AERO 37 WNW RMY 38
01/12 26/9/18/-7/0.00/0.0/486/89           32 NW  AERO 32 NW  RMY 29
01/13 25/11/18/-7/0.00/0.0/456/84          18 NNW AERO 16 NW  RMY N/A
01/14 27/20/24/-1/0.00/0.0/120/22          20 NNE AERO 17 N   RMY N/A
01/15 34/18/26/1/0.00/0.0/402/73           22 NW  AERO 21 NNW RMY N/A
01/16 34/23/29/+4/0.00/0.0/270/47          33 W   AERO 32 W   RMY 35
01/17 27/13/20/-5/0.00/0.0/480/87          30 NNW AERO 28 NW  RMY N/A
01/18 40/21/31/+6/0.00/0.0/156/28          18 WNW AERO 18 WNW RMY N/A 
01/19 31/24/28/+3/0.23/1.6/198/36          30 E   AERO 30 E   RMY N/A
01/20 33/3/18/-7/1.77/2.6/000/00           39 ENE AERO 43 ENE RMY 39
01/21 3/-2/1/-24/0.00/0.0/348/62           32*WNW AERO 41 WNW RMY M
01/22 24/0/12/-13/0.00/0.0/522/93          28 NW  AERO 30 NW  RMY 29
01/23 46/15/31/+6/0.00/0.0/000/00          37 SSW AERO 39 SSW RMY N/A
01/24 57/31/44/+19/1.44/0.0/000/00         77 S   AERO 79 S   RMY N/A
01/25 37/23/30/+5/0.00/0.0/378/66          41 WNW AERO 46 WNW RMY N/A
01/26 33/17/25/0/0.00/0.0/534/94           25 W   AERO 25 W   RMY 27        
01/27 44/24/34/+9/0.00/0.0/480/84          39 S   AERO 39 S   RMY 41
01/28 30/19/28/+3/0.00/0.0/348/60          28 NW  AERO 28 NW  RMY N/A
01/29 32/19/26/+1/0.06/T/072/13            22 SE  AERO 21 E   RMY N/A
01/30 36/3/20/-6/0.19/0.5/504/88           52 W   AERO 53 W   RMY 57 
01/31 14/-2/6/-20/0.00/0.0/570/99          33 WNW AERO 35 WNW RMY N/A

*Official gust chart reading low

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 19/5/12/-14/0.00/0.0/552/95          29 W   AERO 28 W   RMY N/A
02/02 30/7/19/-7/0.00/0.0/318/55           32 WSW AERO 32 WSW RMY 31
02/03 38/27/26/+7/0.00/0.0/126/22          26 S   AERO 25 S   RMY N/A
02/04 59/33/46/+20/0.00/0.0/540/93         25 SSW AERO 28 SSW RMY N/A
02/05 62/39/51/+25/0.00/0.0/354/60         30 WNW AERO 29 WNW RMY 32
02/06 39/28/34/+8/..../.../396/67          24 NNW AERO 23 NNW RMY N/A
02/07 37/31/34/+7/..../.../.../..          28 ENE AERO 24 ENE RMY 28
02/08 51/27/39/+12/..../.../.../..         46 W   AERO 46 WNW RMY 51
02/09 32/20/26/-1/..../0.0/.../..          50 WNW AERO 52 WNW RMY 52
02/10 33/18/26/-1/..../0.0/.../..          24 WNW AERO 23 WNW RMY 25
02/11 34/21/28/+1/..../0.0/.../..          24 NNW AERO 23 NNW RMY 25

02/12 Low temp since midnight is 13F; normal low is 19F
 

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

RECORDS FOR FEBRUARY 12
HIGH 56F IN 1999
LOW -14F IN 1914
PRECIP 4.85 INCHES IN 1886 [RECORD FOR MONTH]
SNOWFALL 15.0 INCHES IN 2006
PEAK GUST 70 MPH E IN 1985

RECORDS FOR FEBRUARY 13
HIGH 64F IN 1951
LOW -10F IN 1967
PRECIP 2.80 INCHES IN 2008
SNOWFALL 13.5 INCHES IN 1894
PEAK GUST 60 MPH SE IN 1972

TODAY'S REPORT PREPARED BY: Benjamin Turner