BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, JANUARY 10, 2007  
ALL TIMES ARE IN EASTERN STANDARD TIME
 
TEMPERATURES RETURNING MUCH CLOSER TO NORMAL TODAY
GUSTY WEST WINDS TO NEARLY 50 MPH EARLY THIS AFTERNOON
 
Much colder and much drier air was arriving on very 
gusty west winds by noon today.  Temperatures were 
struggling in the lower 30's for the first time since
a couple of moderately cold days near the end of last 
month. However, today will still likely end up a few
degrees warmer than average. 
Dewpoint temperatures have dropped into the single 
numbers and visibility has gone up to 90 miles under
sunny skies. A peak wind gust to 48 MPH W was recorded
before 1 p.m. January has been a windy month to date
averaging 17 MPH and today marks the 6th consecutive day
with peak wind gusts of 40 MPH or more.
 
Today's observations:
 
7 A.M.   
Weather: Clear, clouds offshore, dense ci layer ENE-SSE, few altocumulus 
and cirrus  
Temperature: 25F, Dew point: 19F, Wind: W at 09 kts
Sea-level pressure: 29.89 inches Hg, rising
Visibility: 60 miles
6-hourly min. temp. 25 deg. 
BHO SA 1155 CLR 60 121/25/19/2809/989/ SC ALG/OFFSHR DSNT NNE-S
FEW AC/ACSL S-NW FEW CI ALQDS DENSE CI LYR XTDNG ENE-SSE/
8/542 53016 10028 20025
 
10 A.M.    
Weather: Scattered high clouds and cumulus/stratocumulus forming 
Virga observed in the distant WNW 
Temperature: 32F, Dew point: 19F, Wind: W at 12 kts
Sea-level pressure: 29.96 inches Hg, rising  
Visibility: 80 miles  
BHO SA 1455 250 –SCT 300 –SCT 80 144/32/19/2712/996/ CUFRA/CU FRMG/
SC MDT CUFRM TOPS DSNT ALQDS FEW CCSL VIRGA DSNT WNW WNW 24V30/ 
8/801 51023 
  
1 P.M.    
Weather: Scattered cumulus/stratocumuls clouds 
Temperature: 32F, Dew point: 6F, Wind: W at 24G34 kts
Peak Wind: 42 kts W @ 12:38 p.m. 
Sea-level pressure: 29.93 inches Hg, rising   
Visibility: 90 miles  
6-hourly max. temp: 34 deg.                     
BHO SA 1755 60 SCT 90 136/32/6/2824G34/993/ FEW PTCHS VIRGA NE-E 
PK WND 2642/38/ 8/400 55008 10034 20032 
 
WEATHER SUMMARY FOR TUESDAY, JANUARY 9 
 
TEMPERATURE (DEGREES F)
MAX.....41   NORMAL.....34 
MIN.....29   NORMAL.....18   
MEAN....35   NORMAL.....26
 
DEPARTURE FROM 30-YEAR NORMAL........+ 9
TOTAL DEPARTURE FOR THE MONTH.......+161 (+17.7 DEGREES/DAY) 
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY..........30   DEPARTURE......- 9
TOTAL HEATING UNITS FOR THE MONTH.........185   DEPARTURE.....-160 
TOTAL HEATING UNITS FOR THE SEASON.......2058   DEPARTURE.....-616
TOTAL HEATING UNITS LAST SEASON TO DATE..2464   DIFFERENCE....-406
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY...........40   W AT 1:21 A.M.                
                   AEROVANE............39   W AT 1:21 A.M.                        
                   ASOS................37   W AT 1:21 A.M.                      
                   DAVIS...............40   W AT 1:21 A.M.                 
FASTEST MILE FOR YESTERDAY.............25  W  AT 1:22 A.M. *     
MAXIMUM 2-MINUTE ASOS AVERAGE..........25 WSW AT 2:47 P.M.           
MAXIMUM 2-MINUTE DAVIS AVERAGE.........29 SSW AT 2:24 P.M.                
AVERAGE WIND SPEED AND DIRECTION.....15.9  SW 
                   ASOS..............15.7          
                   DAVIS.............16.2  SW [230 deg]
* last of several occurrences...
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.15
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........1.77  DEPARTURE......+0.42 
                         ASOS..............1.78    
TOTAL PRECIPITATION FOR THE YEAR...........1.77  DEPARTURE......+0.42
                         ASOS..............1.78
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0   DEPARTURE.....-0.5
TOTAL SNOWFALL FOR THE MONTH................0.0   DEPARTURE.....-4.5
TOTAL SNOWFALL FOR THE SEASON...............3.7   DEPARTURE....-14.4
 
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/.../..         40 W    Aero 39 MPH W
 
1/10 morning low temp. 25 deg; normal low now 18 deg. 
      
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR JANUARY 10
HIGH 54F IN 2000
LOW -7F IN 2004
PRECIP 2.16 INS. IN 1935
SNOWFALL 6.3 INS. IN 1977
WIND 73e SE IN 1977
 
RECORDS FOR JANUARY 11
HIGH 59F IN 1975
LOW -7F IN 1968
PRECIP 1.14 INS. IN 1956
SNOW 10.2 INS. 1927
WIND 95e MPH S IN 1980
 
TODAY'S REPORT By: Robert Skilling