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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, JANUARY 25, 2018  
ALL TIMES ARE IN EASTERN STANDARD TIME

COOL, DRY, AND SUNNY WINTER DAY....

Temperatures began to rapidly fall yesterday afternoon
and continued to fall overnight with a low of 17F so
far today. This is the normal daily low. So far we have
reached a max of 27F by 1:00 P.M. This is 7 degrees 
below the daily normal of 34F. Wind from the WNW have
have increased throughout the day. So far we have
recorded at peak gust of 31 kts (36 MPH) by 1:00 P.M.
Humidity was low today which made for excellent 
visibility of 80 miles at 10:00 A.M and 1:00 P.M. 
Sky cover decreased throughout the day and we had a 
clear sky with only a few distant cumulus clouds along
the horizon at 1:00 P.M.

Today's Observations:

7 A.M.
Weather: Scattered cirrostratus, few stratocumulus distant
offshore NNE-ESE 
Temperature: 17F; Dew Point: 10F; Wind: WNW at 9G16 kts
Sea-level pressure: 30.19 ins. Hg, rising, then more quickly 
Visibility: 60 miles
6-hr Max temp: 20F
6-hr Min temp: 17F
24-hr precip: 0.00 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 200 SCT 60 222/17/10/2909G16/019/ FEW 
SC DSNT OFFSHR NNE-ESE/ 8/508 53028 10020 20017 

10 A.M.
Weather: Scattered altocumulus, scattered cirrostratus,
few cumulus distant along the horizon ENE-E 
Temperature: 25F; Dew Point: 10F; Wind: WNW at 11G20 kts
Sea-level pressure: 30.22 ins. Hg, rising, then more slowly
Visibility: 80 miles 
3-hr precip: 0.00 ins.
3-hr snowfall: 0.0 ins. 
BHO SA 1455 160 SCT 250 SCT 80 234/25/10/2911G20/022/ 
FEW CU DSNT ALG HRZN ENE-E/ 8/888 51012 

1 P.M.
Weather: Clear, few cumulus distant along the horizon 
ENE-E  
Temperature: 27F; Dew Point: 8F; Wind: W at 14G22 kts,
Peak wind: 27 kts (31 MPH) WNW at 12:49 P.M.
Sea-level pressure: 30.22 ins. Hg, steady then falling 
Visibility: 80 miles 
6-hr precip: 0.00 ins.
6-hr snowfall: 0.0 ins.
6-hr Max temp: 27F
6-hr Min temp: 17F
Snow depth: 0 ins. 
BHO SA 1755 CLR 80 232/27/08/3016G27/022/ FEW CU DSNT 
ALG HRZN ENE-E PK WND 3127/49/ 8/100 58002 10027 20017

SUMMARY FOR WEDNESDAY, JANUARY 24, 2018

TEMPERATURE (DEGREES F)
MAX.....37   NORMAL.....34
MIN.....22   NORMAL.....17
MEAN....30   NORMAL.....25

DEPARTURE FROM 30-YEAR NORMAL...........................+5
TOTAL DEPARTURE FOR THE MONTH............................0 [-0.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY.............35  DEPARTURE..........-5
TOTAL HEATING UNITS FOR THE MONTH............949  DEPARTURE..........+0
TOTAL HEATING UNITS FOR THE SEASON..........3071  DEPARTURE........-182
TOTAL HEATING UNITS LAST SEASON TO DATE.....2806  DIFFERENCE.......+265

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................36 WNW AT 8:56 A.M.
                   AERO.........................35 WNW AT 9:09 A.M.
                   ASOS.........................36 WNW AT 9:41 A.M.
                   DAVIS........................36 M   AT 9:31 P.M.* RMY 36 
FASTEST MILE FOR YESTERDAY......................25 WNW AT 9:31 A.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...................25 WNW AT 9:33 A.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE..................24 M   AT 9:31 A.M.*
AVERAGE WIND SPEED AND DIRECTION..............15.0 W
                   ASOS.......................13.8 
                   DAVIS......................13.1 *
*Davis direction malfunctioning

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..........5.52  DEPARTURE......+2.12
                         ASOS..............6.07
TOTAL PRECIPITATION FOR THE YEAR...........5.52  DEPARTURE......+2.12
                         ASOS..............6.07

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE........-0.6
TOTAL SNOWFALL FOR THE MONTH...............19.3  DEPARTURE........+5.9
TOTAL SNOWFALL FOR THE SEASON..............28.6  DEPARTURE........-0.8

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/-24/0.00/0.0/538/98       30 NW  AERO 30 NW  RMY 31
1/02 15/-2/7/-20/0.00/0.0/402/73       26 W   AERO 25 W   RMY 26  
1/03 28/11/20/-6/0.00/0.0/430/78       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/-16/0.00/0.0/431/78       53 W   AERO 53 W   RMY 57
1/06 10/-2/4/-22/0.00/0.0/554/100      43 WSW AERO 47 WSW RMY 47
1/07 14/-8/3/-23/0.00/0.0/549/99       37 WNW AERO 35 WNW RMY N/A 
1/08 33/14/24/-2/0.02/T/006/01         40 S   AERO 40 S   RMY 42 
1/09 40/25/33/+7/T/T/356/64            37 W   AERO 35 W   RMY 33
1/10 36/20/28/+3/0.00/0.0/553/99       30 W   AERO 30 W   RMY N/A
1/11 50/32/41/+16/0.00/0.0/056/10      33 S   AERO 32 S   RMY 34
1/12 60/45/53/+28/..../0.0/011/02      56 S   AERO 56 S   RMY 55
1/13 60/17/39/+14/..../0.0/265/47      58 SSW AERO 60 SSW RMY 62
1/14 21/11/16/-9/0.00/0.0/350/62       30 NW  AERO 30 NW  RMY N/A
1/15 18/11/15/-10/0.02/0.5/000/00      23 NNW AERO 21 N   RMY 23
1/16 31/18/25/0/0.00/0.0/153/27        17 SSE AERO 15 SSE RMY N/A 
1/17 32/29/31/+6/0.23/2.3/.../00       20 SE  AERO 17 SE  RMY N/A
1/18 29/16/23/-2/0.00/0.0/.../..       24 NW  AERO 23 NW  RMY 26 
1/19 34/17/26/+1/0.00/0.0/.../..       22 SSW AERO 20 SSW RMY N/A
1/20 45/27/36/+11/0.00/0.0/.../..      38 WSW AERO 37 WSW RMY 39 
1/21 47/34/41/+16/0.00/0.0/.../..      22 W   AERO 21 W   RMY N/A
1/22 37/34/36/+11/..../0.0/000/00      21 E   AERO 16 E   RMY N/A
1/23 55/33/44/+19/..../0.0/000/00      53 S   AERO 58 S   RMY 57 
1/24 37/22/30/+5/0.00/0.0/.../..       36 WNW AERO 35 WNW RMY 36 

1/25 Low temp since midnight is 17F; 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 MINIMUM 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 25
HIGH 56F IN 2010
LOW -10F IN 1935
PRECIP 2.24 INS. IN 1979
SNOWFALL 12.5 INS. IN 1941
PEAK GUST 81 MPH WNW IN 1972

RECORDS FOR JANUARY 26
HIGH 68F IN 1950 [RECORD FOR MONTH]
LOW -5F IN 1920
PRECIP 1.60 INS. IN 1958
SNOW 9.0 INS. IN 1898
WIND 90e MPH SE IN 1978

TODAY'S REPORT PREPARED BY: Kaitlin Ann Geagan