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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, JANUARY 12, 2015    
ALL TIMES ARE IN EASTERN STANDARD TIME

SIGNIFICANT WARM-UP OVERNIGHT, MIXED PRECIPITATION
ENTERS THE REGION BY MORNING

Temperatures were quick to warm from yesterday morning's 
7:00 AM EST observation at 10F, climbing to above freezing
by approximately 1:00 AM EST this morning. Partly to
mostly cloudy skies yesterday filled in overnight, with
overcast altostratus visible for this morning's 7:00 AM EST
observation 

Light rain mixed with ice pellets began this morning at 7:37 AM 
EST, with ice pellets ending not long after. As of the 10:00 AM 
EST observation just a trace of rain and ice pellets were 
recorded. 

By the 1:00 PM EST observation rain was slightly steadier with
0.03 inches of rain measured between the 10:00 AM and 1:00 PM EST
observations by both the standard and ASOS gauges. Visibility
was reduced significantly with only 7 miles visible in all directions
with stratus fractus present in all directions. A maximum of 36F
had been recorded, just two degrees higher than the 7:00 AM EST 
observation.
 
Today's Observations:

7 A.M.
Weather: Overcast altostratus
Temperature: 34F; Dew Point: 18F; Wind: SSW at 8 kts
Sea-level pressure: 30.34 ins. Hg, decreasing, then more quickly                     
Visibility: 30 miles, except 40 miles E-SW
6-hr max temp: 34F
6-hr min temp: 32F 
24-hr precip.: 0.00 ins 
24-hr snowfall: 0.0 ins
Snow Depth: Trace
BHO SA 1155 E41 OVC 30 274/34/18/2008/034/ VSBY E-SW 40 MI/ 
8/02/ 58020 10034 20032

10 A.M. 
Weather: Light rain, overcast alto/nimbostratus,
precipitation very light
Temperature: 36F; Dew Point: 20F; Wind: SSW at 13 kts
Sea-level pressure: 30.30 ins. Hg, falling, then more slowly
Visibility: 35 miles, obscured by showers in all directions 
3-hr precip: Trace
3-hr snowfall: Trace of ice pellets
BHO SA 1455 E31 OVC 35R- 260/36/20/2113G/030/ VSBY NW 50 MI SHWRS DSNT 
ALQDS PRCP VRY LGT NEW SNW PST 3 HRS TRACE/ 8/02/ 56014 MANUAL 6000/ 

1 P.M. 
Weather: Light rain, overcast nimbostratus, few
stratus fractus in all directions
Temperature: 34F; Dew Point: 33F; Wind: SSW at 11 kts,
Sea-level pressure: 30.19 ins. Hg, decreasing then decreasing more quickly
Visibility:  7 miles, obscured by light rain
6-hr max temp: 36F
6-hr min temp: 34F
6-hr precip: 0.03 ins.
6-hr snowfall: Trace
BHO SA 1755 E20 OVC 7R- 222/34/33/2111/019/ FEW STFRA ALQDS NEW SNW 
PST 6 HRS TRACE/ 8/72/ 58038 ASOS 60003 MANUAL 60003 10036 20034


SUMMARY FOR SUNDAY, JANUARY 11, 2015

TEMPERATURE (DEGREES F)
MAX.....31   NORMAL.....34
MIN......9   NORMAL.....17
MEAN....20   NORMAL.....25

DEPARTURE FROM 30-YEAR NORMAL..........................-5
TOTAL DEPARTURE FOR THE MONTH.........................-39 [-3.7 DEGREES/DAY] 
 
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............45  DEPARTURE...........+5
TOTAL HEATING UNITS FOR THE MONTH.............468  DEPARTURE..........+40     
TOTAL HEATING UNITS FOR THE SEASON...........2528  DEPARTURE.........-205
TOTAL HEATING UNITS LAST SEASON TO DATE......2752  DIFFERENCE........-224

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY..................26  SSW  AT 11:34 P.M.   
                   ASOS.......................29  S    AT 11:34 P.M.  
                   DAVIS......................27  S    AT 10:26 P.M. RMY N/A
FASTEST MILE FOR YESTERDAY....................22  SSW  AT 11:58 P.M.  
MAXIMUM 2-MINUTE ASOS AVERAGE.................22  SSW  AT 11:58 P.M.    
MAXIMUM 2-MINUTE DAVIS AVERAGE................21  SSW  AT 11:58 P.M.   
AVERAGE WIND SPEED AND DIRECTION.............12.0 SSW
                   ASOS......................12.3    
                   DAVIS.....................10.8 SW [227 degrees] 
* last of several occurrences....               

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..........1.26  DEPARTURE.....-0.30 
                         ASOS..............1.27  
TOTAL PRECIPITATION FOR THE YEAR...........1.26  DEPARTURE.....-0.30
                         ASOS..............1.27  

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE......-0.6
TOTAL SNOWFALL FOR THE MONTH................4.1  DEPARTURE......-2.1
TOTAL SNOWFALL FOR THE SEASON..............15.1  DEPARTURE......-7.1  

PRELIMINARY CLIMATE SUMMARY FOR JANUARY CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/SUN(MIN.)/SUN(%)/ PEAK GUST/RMY 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

1/1  31/18/25/-2/0.00/0.0/.../..              29 SSW RMY 30 
1/2  37/26/32/+5/0.00/0.0/.../..              35 WSW RMY 38
1/3  34/21/28/+2/0.67/2.5/.../..              25 SE  RMY 26   
1/4  51/33/42/+16/0.48/0.0/000/00             30 SSW RMY N/A
1/5  46/13/30/+4/0.00/0.0/.../..              48 W   RMY 54
1/6  15/10/13/-13/0.02/0.4/.../..             29 W   RMY N/A
1/7  22/01/12/-14/0.01/0.3/.../..             43 WNW RMY 47  
1/8  16/-5/6/-20/0.00/0.0/.../..              39 WNW RMY N/A 
1/9  27/16/22/-4/0.08/0.9/.../..              35 WSW RMY 38  
1/10 22/11/17/-8/0.00/0.0/.../..              26 WNW RMY 27
1/11 31/9/20/-5/45/0.00/0.0/.../..            26 SSW RMY N/A 

1/12 morning low temp: 31F since midnight; normal low is now 17F


DAILY RECORDS FOR JANUARY 2015
None so far.

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

RECORDS FOR JANUARY 12
HIGH 57F IN 1913, 1975
LOW -15F IN 1886
PRECIP 2.04 INS. IN 2011
SNOW 18.2 INS. IN 2011
WIND 84e MPH S IN 1980

RECORDS FOR JANUARY 13
HIGH 57F IN 1890,1932
LOW -10F IN 1912,1914
PRECIP 1.54 INS. IN 1979
SNOWFALL 12.6 INS. IN 1964
PEAK GUST 74 MPH NE IN 1964

TODAY'S REPORT PREPARED BY: Brian Fitzgerald