BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, JANUARY 23, 2007
ALL TIMES ARE IN EASTERN STANDARD TIME
 
1.2 INCHES OF LIGHT SNOWFALL YESTERDAY INTO EARLY THIS MORNING
HAD ONLY A 0.06 INCH WATER EQUIVALENT
SEASONAL TOTAL NOW JUST 5.0 INCHES!
 
The total snowfall measured at 7 a.m. this morning 
was 1.2 inches, including the 0.1 inch that fell 
yesterday morning.  The snowfall that began early
last evening ending in the early hours of today 
totaled 1.1 inches and the total water equivalent
measured 0.06 inch in the standard gage and was 
the same amount recorded by ASOS.
 
This was the first inch of snow to occur here since
3.2 inches fell on December 4th.  The January total
now stands at 1.3 inches or 9.7 inches less than average
through yesterday's date.  The seasonal total has now 
reached a mere 5.0 inches and is 19.6 inches
less than average. 
  
Today's observations:
 
7 A.M.   
Weather: Broken clouds, clearing W-NNE  
Temperature: 18F, Dew point: 16F, Wind: WNW at 10 kts 
Sea-level pressure: 29.78 inches Hg, rising
Visibility: 25 miles
6-hourly min. temp. 18 deg. 
24-hourly precip; 0.06 in. and snowfall: 1.2 ins. 
BHO SA 1155 E100 BKN 120 BKN 25 083/18/16/3010/978/ FEW SC 
SKY CLRG W-NNE VSBY LWR E-S W-N 35 TOTAL NEW SNW PST 24 HRS 1.2 INS/ 
8/570 4/001 53004 ASOS 60001 MANUAL 6001/ ASOS 70006
MANUAL 70006 10019 20018 
   
10 A.M.    
Weather: Scattered clouds, light snow flurries 
Temperature: 22F, Dew point: 17F, Wind: NW at 12 kts 
Sea-level pressure: 29.83 inches Hg, rising     
Visibility: 15 miles, 8 miles N-SE   
3-hourly precip. and snowfall: trace 
BHO SA 1455 25 SCT 37 SCT 15SW- 100/22/17/3112/983/ 
VSBY N-SE 8 PCPN VRY LGT/ 8/800 51017 MANUAL 6000/ 
  
1 P.M.    
Weather: Overcast stratocumulus    
Temperature: 27F, Dew point: 17F, Wind: WNW at 12 kts 
Sea-level pressure: 29.80 inches Hg, falling    
Visibility: 50 miles, 20 miles NE-SE   
6-hourly snowfall: trace
6-hourly precip:  trace 
6-hourly max. temp. 27 deg. 
BHO SA 1755 E32 BKN 45 OVC 50 092/27/17/3012/980/ 
BRGHT SPTS FEW SML BINOVC VSBY NE-SE 20/ 8/5// 
58008 MANUAL 6000/ 10027 20017
 

WEATHER SUMMARY FOR MONDAY, JANUARY 22 
 
TEMPERATURE (DEGREES F)
MAX.....24    NORMAL.....33 
MIN.....18    NORMAL.....17   
MEAN....21    NORMAL.....25
 
DEPARTURE FROM 30-YEAR NORMAL.........-4 
TOTAL DEPARTURE FOR THE MONTH.......+188 (+8.3 DEGREES/DAY) 
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY..........44   DEPARTURE.......+4
TOTAL HEATING UNITS FOR THE MONTH.........669   DEPARTURE.....-185 
TOTAL HEATING UNITS FOR THE SEASON.......2542   DEPARTURE.....-641
TOTAL HEATING UNITS LAST SEASON TO DATE..2812   DIFFERENCE....-270
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............16 WNW  AT  8:54 P.M. 
                   AEROVANE.............15 WNW  AT  8:54 P.M.  
                   ASOS.................14 WNW  AT 11:52 P.M.  
                   DAVIS................15 WNW  AT  8:52 P.M.  
FASTEST MILE FOR YESTERDAY..............11 WNW AT 11:56 P.M.    
MAXIMUM 2-MINUTE ASOS AVERAGE...........13 WNW AT 11:33 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..........12 WNW AT 11:29 P.M. 
AVERAGE WIND SPEED AND DIRECTION......  4.0 WNW 
                    ASOS................4.5     
                    DAVIS.............  4.0 NNW [330 deg]  
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.06  DEPARTURE......-0.09
                         ASOS..............0.06
TOTAL PRECIPITATION FOR THE MONTH..........2.87  DEPARTURE......-0.56  
                         ASOS..............2.80    
TOTAL PRECIPITATION FOR THE YEAR...........2.87  DEPARTURE......-0.56  
                         ASOS..............2.80
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M......... 1.2   DEPARTURE.....+0.7
TOTAL SNOWFALL FOR THE MONTH................0.1   DEPARTURE.... -9.7
TOTAL SNOWFALL FOR THE SEASON...............3.8   DEPARTURE....-19.6
 
PRELIMINARY CLIMATE SUMMARY FOR JANUARY 2007......CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
 
AERO: Aerovane recording wind system when significant
TSTM: Thunderstorm day
....: Data not yet available
 
1/1  53/30/42/+15/0.98/0/000/00     38 SE 
1/2  43/31/37/+10/0.03/0/505/92     44 W    Aero 47 MPH W   
1/3  49/30/40/+13/0/0/435/79        40 S   
1/4  53/40/47/+20/0/0/198/36        31 SSW
1/5  61/46/54/+27/0.04/0/000/00     44 S    Aero 44 MPH S
1/6  66/48/57/+31/0.03/0/161/29     48 SSW  Aero 47 MPH SSW 
1/7  50/38/44/+18/0/0/505/91        43 W    Aero 44 MPH W 
1/8  52/36/44/+18/0.69/0/000/00     45 W    Aero 45 MPH W 
1/9  41/29/35/+9/0/0/518/93         40 W    Aero 39 MPH W
1/10 34/22/28/+2/0/0/525/94         48 W
1/11 33/17/25/-1/0/0/336/60         36 S    Aero 38 MPH S
1/12 48/32/40/+14/0/0/168/30        38 SSW  Aero 39 MPH SSW
1/13 48/36/42/+16/0.06/000/00       30 S     
1/14 38/31/35/+9/0.16/0/000/00      21 NE
1/15 40/31/36/+10/0.58/0/000/00     25 NNE
1/16 38/15/27/+1/0.05/0/000/00      40 W    Aero 42 MPH W
1/17 18/6/12/-14/0.00/0/563/99      38 WNW  Aero 43 MPH WNW
1/18 36/10/23/-3/0.13/0.1/171/30    33 SSE
1/19 38/30/34/+9/0.06/T/269/47      40 W    Aero 41 MPH W
1/20 30/12/21/-4/T/T/.../..         51 W    Aero 55 MPH WNW
1/21 24/9/17/-8/0/0/.../..          33 W 
1/22 24/18/21/-4/0.05/1.0/000/00    16 WNW
 
1/23 morning low temp. 17 deg; normal now 17 deg.
     0.01 in. of precip. and 0.2 in. snowfall
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR JANUARY 23
HIGH 62F IN 1906
LOW -10F IN 1976
PRECIP 2.40 INS. IN 1935
SNOWFALL 14.6 INS. IN 1966
PEAK GUST 85 MPH S IN 1992
 
RECORDS FOR JANUARY 24
HIGH 60F IN 1967
LOW -12F IN 1907
PRECIP 2.04 INS. IN 1998
SNOWFALL 11.3 INS. IN 1935
PEAK GUST 82 MPH S IN 1996
 
TODAY'S REPORT By: Robert Skilling