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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, JANUARY 17, 2018  
ALL TIMES ARE IN EASTERN STANDARD TIME

SEASONABLE TEMPERATURES YESTERDAY FOG AND LIGHT 
SNOW TODAY....

A light snow began early this morning and has been
continuous throughout the day. So far we have measured
0.21 ins. of liquid precipitation and 2.1 ins. of snow
by 1:00 P.M. We had a wind shift midday from SE to N. 
The wind has slightly increased since yesterday's 
light wind. The wind began moderate today but decreased  
after the wind shifted. Skies have remained overcast 
nimbostratus all day. With a 100% humidity visibility 
decreased to 1/4 mile by 1:00 P.M. due to fog. The
increased humidity has kept temperatures from departing
with only a 2 degree increased in temperature since 
midnight.  

Today's Observations:

7 A.M.
Weather: Light snow and fog, overcast nimbostratus
Temperature: 30F; Dew Point: 30F; Wind: E at 9 kts
Sea-level pressure: 30.30 ins. Hg, falling, unsteadily 
Visibility: 1/2 mile
6-hr Max temp: 30F
6-hr Min temp: 30F
24-hr precip: 0.05 ins.
24-hr snowfall: 0.5 ins.
Snow depth: 1 ins.
BHO SA 1155 E17 OVC 1/2S-F 262/30/30/0909/030/ NEW SNW PST
24 HRS 0.5 INS/ 8/6// 4/001 57013 MANUAL 70005 ASOS 70004 
10030 20030

10 A.M.
Weather: Light snow and fog, overcast nimbostratus 
Temperature: 32F; Dew Point: 32F; Wind: ENE at 10G14 kts
Sea-level pressure: 30.27 ins. Hg, falling, then more quickly 
Visibility: 3/4 mile
3-hr precip: 0.11 ins.
3-hr snowfall: 1.5 ins. 
BHO SA 1455 E7 OVC 3/4S-F 249/32/32/0710G14/027/ NEW SNW 
PST 3 HRS 1.5 INS/ 8/6// 56013 MANUAL 6011/ ASOS 60012   

1 P.M.
Weather: Very light snow and fog, overcast nimbostratus 
Temperature: 32F; Dew Point: 32F; Wind: NNE at 6 kts,
Wind speed: Light
Sea-level pressure: 30.16 ins. Hg, falling, then more quickly 
Visibility: 1/4 mile
6-hr precip: 0.15 ins.
6-hr snowfall: 1.6 ins.
6-hr Max temp: 32F
6-hr Min temp: 30F
BHO SA 1755 E5 OVC 1/4S-F 212/32/32/0206/016/ NEW SNW PST 6 HRS 
1.6 INS PCPN VRY LGT WND LGT/ 8/6/// 4/002 58037 MANUAL 6013/ 
ASOS 60015 10032 20030   


SUMMARY FOR TUESDAY, JANUARY 16, 2018

TEMPERATURE (DEGREES F)
MAX.....31   NORMAL.....33
MIN.....18   NORMAL.....17
MEAN....25   NORMAL.....25

DEPARTURE FROM 30-YEAR NORMAL............................0
TOTAL DEPARTURE FOR THE MONTH..........................-67 [-4.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY.............40  DEPARTURE...........0
TOTAL HEATING UNITS FOR THE MONTH............696  DEPARTURE.........+69
TOTAL HEATING UNITS FOR THE SEASON..........2818  DEPARTURE........-114
TOTAL HEATING UNITS LAST SEASON TO DATE.....2585  DIFFERENCE.......+233

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................17 SE  AT 10:12 P.M.
                   AERO........................15 SE  AT 10:12 P.M.
                   ASOS........................17 S   AT 11:16 P.M.
                   DAVIS.......................16 M   AT 10:11 P.M.* RMY N/A 
FASTEST MILE FOR YESTERDAY.....................13 SSE AT 11:12 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE..................14 S   AT 11:13 P.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE.................12 M   AT 11:13 P.M.*
AVERAGE WIND SPEED AND DIRECTION..............6.3 SSE
                   ASOS.......................6.8
                   DAVIS......................6.0 *

*DAVIS DIRECTON MALFUNCTIONING

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.05  DEPARTURE......-0.09
                         ASOS..............0.04
TOTAL PRECIPITATION FOR THE MONTH..........4.03  DEPARTURE......+1.84
                         ASOS..............4.44
TOTAL PRECIPITATION FOR THE YEAR...........4.03  DEPARTURE......+1.84
                         ASOS..............4.44

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.5  DEPARTURE.........0.0
TOTAL SNOWFALL FOR THE MONTH...............17.5  DEPARTURE........+8.5
TOTAL SNOWFALL FOR THE SEASON..............26.8  DEPARTURE........+1.8


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

1/01 11/-5/3/-24/0.00/0.0/.../..        30 NW  AERO 30 NW  RMY 31
1/02 15/-2/7/-20/0.00/0.0/.../..        26 W   AERO 25 W   RMY 26  
1/03 28/11/20/-6/0.00/0.0/.../..        23 WSW AERO 20 WSW RMY N/A
1/04 28/18/23/-3/1.66/16.5/000/00       54 NNW AERO 60 NNW RMY 64
1/05 18/2/10/-16/0.00/0.0/.../..        53 W   AERO 53 W   RMY 57
1/06 10/-2/4/-22/0.00/0.0/.../..        43 WSW AERO 47 WSW RMY 47
1/07 14/-8/3/-23/0.00/0.0/.../..        37 WNW AERO 35 WNW RMY N/A 
1/08 33/14/24/-2/T/T/.../..             40 S   AERO 40 S   RMY 42 
1/09 40/25/33/+7/T/T/.../..             37 W   AERO 35 W   RMY 33
1/10 36/20/28/+3/0.00/0.0/.../..        30 W   AERO 30 W   RMY N/A
1/11 50/32/41/+16/0.00/0.0/.../..       33 S   AERO 32 S   RMY 34
1/12 60/45/53/+28/..../0.0/.../..       56 S   AERO 56 S   RMY 55
1/13 60/17/39/+14/T/0.0/.../..          58 SSW AERO 60 SSW RMY 62
1/14 21/11/16/-9/0.00/0.0/.../..        30 NW  AERO 30 NW  RMY N/A
1/15 18/11/15/-10/..../.../.../..       23 NNW AERO 21 N   RMY 23
1/16 31/18/25/0/0.00/0.0/.../..         17 SSE AERO 15 SSE RMY N/A  
 
1/17 Low temp since midnight is 30F; normal low is now 17F


DAILY RECORDS FOR JANUARY 2018

01/04/18: NEW DAILY RECORD MAXIMUM SNOWFALL OF 16.5 INS. 
          PREVIOUS RECORD WAS 8.6 INS. SET IN 1923 AND 
          TIED IN 1942 

01/07/18: DAILY RECORD LOW MINIMUM TEMPERATURE OF -8F,
          PREVIOUS RECORD OF -7F WAS SET IN 1896

01/12/18: DAILY RECORD HIGH MINUMUM TEMPERATURE OF 45F,
          PREVIOUS RECORD OF 42F WAS SET IN 2017

          DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 60F,
          PREVIOUS RECORD OF 59F WAS SET IN 2017

01/13/18: DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 60F,
          PREVIOUS RECORD OF 57F WAS SET IN 1890 AND
  TIED IN 1932 


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

RECORDS FOR JANUARY 17
HIGH 55F IN 1973,1995
LOW -8F IN 1907,1982
PRECIP 1.43 INS. IN 1956
SNOWFALL 13.4 INS. IN 1956
PEAK GUST 62 MPH S IN 1994

RECORDS FOR JANUARY 18
HIGH 62F IN 1973,1990
LOW -10F IN 1982
PRECIP 1.68 INS. IN 1915
SNOWFALL 13.0 INS. IN 1948
PEAK GUST 85 MPH SSE IN 2006

TODAY'S REPORT PREPARED BY: Kaitlin Ann Geagan