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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, FEBRUARY 12, 2018  
ALL TIMES ARE IN EASTERN STANDARD TIME

DRY BUT OVERCAST DAY AFTER YESTERDAY'S RAINSTORM...

Light rain began yesterday morning and continued
until early this morning. The rain was moderate to
heavy at times yesterday and storm total of 0.90 ins. 
was measured. So far February has been an above 
average for liquid precip, and we are currently 0.97 ins. 
above normal. 
With an early morning southern wind temperatures 
already have been well above normal today with 
a high of 53F around 4:00 A.M. This is 17 degrees 
above normal. Also around 4:00 A.M., the wind shifted 
from SSE-WNW and temperatures dropped 10 degrees to 
43F by 5:00 A.M. Skies have remained mostly overcast 
today with a few breaks during each observation.
Humidity significantly dropped throughout the day 
from 94%-59% by 1:00 P.M. This allowed for an increase 
in visibility from 60 to 80 miles by 1:00 P.M.  

Today's Observations:

7 A.M.
Weather: Broken altocumulus, broken altostratus,
few stratus fractus drifting below the summit,
few stratocumulus distant offshore ENE
Temperature: 40F; Dew Point: 39F; Wind: WNW at 13G19 kts
Sea-level pressure: 30.10 ins. Hg, rising, then more rapidly     
Visibility: 60 miles
6-hr Max temp: 53F
6-hr Min temp: 40F
24-hr precip: 0.49 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 E130 BKN E200 BKN 60 194/40/39/2913G19/010/ 
FEW STFA DRFTNG BLO SMT NNE-ENE FEW SC DSNT OFFSHR ENE/ 
8/520 51058 MANUAL 70049 ASOS 70054 10053 20040 

10 A.M.
Weather: Broken altocumulus, overcast cirrostratus,
few stratus fractus in all directions, 
few stratocumulus distant WNW-ENE
Temperature: 39F; Dew Point: 34F; Wind: WNW at 9G16 kts
Sea-level pressure: 30.19 ins. Hg, rising, then more slowly
Visibility: 75 miles 
3-hr precip: 0.00 ins.
3-hr snowfall: 0.0 ins.  
BHO SA 1455 E120 BKN E250 OVC 75 225/39/34/3009G16/019/ 
FEW STFA ALQDS FEW SC DSNT WNW-ENE/ 8/576 51031
 
1 P.M.
Weather: Broken altocumulus, overcast altostratus,
break in overcast WSW-NNW, few stratocumulus distant WNW-ESE
Temperature: 40F; Dew Point: 27F; Wind: WNW 8G18 kts
Sea-level pressure: 30.26 ins. Hg, rising, then more slowly 
Visibility:  80 miles
6-hr Max temp: 41F
6-hr Min temp: 38F
6-hr precip: 0.00 ins
6-hr snowfall: 0.0 ins.
Snow depth: 0 in.
BHO SA 1755 E120 BKN E200 OVC 80 248/40/27/3008G18/026/ FEW 
SC DSNT WNW-ESE BINOVC WSW-NNW/ 8/52/ 50023 10041 20038 

SUMMARY FOR SUNDAY, FEBRUARY 11, 2018

TEMPERATURE (DEGREES F)
MAX.....46   NORMAL.....36
MIN.....36   NORMAL.....18
MEAN....41   NORMAL.....27

DEPARTURE FROM 30-YEAR NORMAL...........................+14
TOTAL DEPARTURE FOR THE MONTH...........................+33 [+2.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY.............24   DEPARTURE.........-14
TOTAL HEATING UNITS FOR THE MONTH............391   DEPARTURE.........-34
TOTAL HEATING UNITS FOR THE SEASON..........3712   DEPARTURE........-244
TOTAL HEATING UNITS LAST SEASON TO DATE.....3433   DIFFERENCE.......+279

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................24 SW  AT 11:57 P.M. 
                   AERO.........................21 SW  AT 11:57 P.M.
                   ASOS.........................24 ENE AT  1:04 P.M.
                   DAVIS........................22 M   AT  1:03 P.M.** RMY N/A 
FASTEST MILE FOR YESTERDAY......................19 SW  AT 11:57 P.M.   
MAXIMUM 2-MINUTE ASOS AVERAGE...................20 SSW AT 11:59 P.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE..................19 M   AT 11:56 P.M.**
AVERAGE WIND SPEED AND DIRECTION...............8.7 NE
                   ASOS........................9.5 
                   DAVIS.......................8.0 ** 
** Davis direction malfunctioning

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.49  DEPARTURE......+0.35
                         ASOS..............0.54
TOTAL PRECIPITATION FOR THE MONTH..........2.46  DEPARTURE......+0.97
                         ASOS..............2.65  
TOTAL PRECIPITATION FOR THE YEAR...........8.46  DEPARTURE......+2.62
                         ASOS..............9.23

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE........-0.5
TOTAL SNOWFALL FOR THE MONTH................3.6  DEPARTURE........-1.8
TOTAL SNOWFALL FOR THE SEASON..............38.1  DEPARTURE........-0.5

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

2/1  45/27/36/+10/..../0.0/.../..      36 SSW AERO 35 SSW RMY N/A 
2/2  34/08/21/-5/..../.../.../..       43 WNW AERO 46 WNW RMY 46 
2/3  25/04/15/-11/0.00/0.0/.../..      26 S   AERO 24 S   RMY 30 
2/4  45/23/34/+8/.../T/.../..          31 SSE AERO 29 S   RMY 30
2/5  46/19/33/+7/0.00/0.0/.../..       47 WNW AERO 47 WNW RMY 44
2/6  31/17/24/+2/T/T/.../..            26 SSW AERO 23 SSW RMY 23 
2/7  42/21/32/+5/0.62/1.1/000/00       45 SW  AERO 46 SW  RMY 47
2/8  30/20/25/-2/0.00/0.0/.../..       38 WNW AERO 38 WNW RMY N/A
2/9  30/16/23/-4/0.00/0.0/.../..       28 S   AERO 25 S   RMY N/A
2/10 51/28/40/+13/..../0.0/.../..      31 S   AERO 30 S   RMY 31
2/11 46/36/41/+14/..../0.0/000/00      24 SW  AERO 21 SW  RMY N/A

2/12 Low temp since midnight is 38F; normal low is now 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: Kaitlin Geagan