BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, JANUARY 19, 2007
ALL TIMES ARE IN EASTERN STANDARD TIME
 
Today's observations:
 
7 A.M.   
Weather: Partial obscurement with fog, overcast
Temperature: 33F, Dew point: 33F, Wind: WSW at 12 kt 
Sea-level pressure: 29.74 inches Hg, falling
Visibility: 1/8 mile, fog
24-hourly snowfall: 0.1 in. 
24-hourly precip: 0.18 in. 
BHO SA 1155 –X E5 BKN 10 OVC 1/8F 072/33/33/2512/974/ 
F5 STRA DRFTG OVR SMT TOTAL NEW SNW PST 24 HRS 0.1 IN 
SNOW ACCUM ON WOOD/GRASS SFCS ONLY/ 8/72/ 58048 
ASOS 60002 MANUAL 600X/ ASOS 70017 MANUAL 70018 10034 20032
 
10 A.M.    
Weather: Overcast, fog  
Temperature: 32F, Dew point: 32F, Wind: W at 14 kt 
Sea-level pressure: 29.67 inches Hg, falling   
Visibility: 3 miles  
3-hourly precip: 0.1 in.
BHO SA 1455 E10 BKN 15 OVC 3F 046/32/32/2714/967/ 
MANUAL 6001/ 8/6// 56026
 
1 P.M.    
Weather: Scattered cumulus, broken stratocumulus
Temperature: 36F, Dew point: 28F, Wind: W at 15G28 kt 
Sea-level pressure: 29.56 inches Hg, falling 
Visibility: 20 miles
Wind: Peak wind 28 kts W past hour
6-hourly precip: 0.01 in.
BHO SA 1755 20 SCT E65 BKN 20 010/36/28/2715G28/956/ 
WND 20V04 PK WND 2728/44/ 8/800 56036 MANUAL 6001/ 10036 20033
 
WEATHER SUMMARY FOR THURSDAY, JANUARY 18 
 
TEMPERATURE (DEGREES F)
MAX.....36   NORMAL.....33 
MIN.....10   NORMAL.....18   
MEAN....23   NORMAL.....26
 
DEPARTURE FROM 30-YEAR NORMAL.........-3 
TOTAL DEPARTURE FOR THE MONTH.......+196 (+10.7 DEGREES/DAY) 
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY..........42   DEPARTURE.......+3
TOTAL HEATING UNITS FOR THE MONTH.........501   DEPARTURE.....-195 
TOTAL HEATING UNITS FOR THE SEASON.......2374   DEPARTURE.....-651
TOTAL HEATING UNITS LAST SEASON TO DATE..2710   DIFFERENCE....-336
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............33 SSE AT  2:32 P.M.
                   AEROVANE.............33 SSE AT  2:32 P.M.
                   ASOS.................31 SSE AT  2:32 P.M.       
                   DAVIS................34 SSE AT  2:31 P.M.
FASTEST MILE FOR YESTERDAY..............24 S   AT  2:34 P.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE...........23 S   AT  2:36 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..........23 S   AT  2:21 P.M.
AVERAGE WIND SPEED AND DIRECTION......10.0 SSE 
                    ASOS..............10.6    
                    DAVIS..............9.7 SSE [155 deg.]
* last of several occurrences..
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.18  DEPARTURE......+0.02
                         ASOS..............0.17
TOTAL PRECIPITATION FOR THE MONTH..........2.80  DEPARTURE......+0.02 
                         ASOS..............2.74    
TOTAL PRECIPITATION FOR THE YEAR...........2.80  DEPARTURE......+0.02
                         ASOS..............2.74
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.1   DEPARTURE.....-0.4
TOTAL SNOWFALL FOR THE MONTH................0.1   DEPARTURE.....-8.9
TOTAL SNOWFALL FOR THE SEASON...............3.8   DEPARTURE....-18.8
 
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/.../..         36 S    Aero 38 MPH S
1/12 48/32/40/+14/0/0/.../..        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/.../..      40 W    Aero 42 MPH W
1/17 18/7/13/-13/0.00/0/.../..      38 WNW  Aero 43 MPH WNW
1/18 36/10/23/-3/0.13/0.1/.../..    33 SSE
 
1/19 morning low temp. 32 deg; normal now 18 deg.
      
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR JANUARY 19
HIGH 59F IN 1973
LOW -11F IN 1887
PRECIP 2.34 INS. IN 1936
SNOWFALL 10.5 INS. IN 1936
PEAK GUST 93e MPH WNW IN 1943
 
RECORDS FOR JANUARY 20
HIGH 59F IN 1951
LOW -09F IN 1901
PRECIP 1.95 INS. IN 1978
SNOWFALL 19.0 INS. IN 1978 [RECORD FOR MONTH]
PEAK GUST 76e MPH NE IN 1978
 
TODAY'S REPORT By: Stephanie Radner