BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, FEBRUARY 27, 2007  
ALL TIMES ARE IN EASTERN STANDARD TIME
 
YESTERDAY'S SNOWFALL 3.5 INCHES...
GREATEST DAILY SNOWFALL OF THE WINTER SEASON!
 
The snowfall which began by 5 a.m. yesterday morning
finally ended as some light flurries during the early
afternoon. The final total was 3.5 inches exceeding 
the previous greatest snowfall of this winter of 3.2 
inches on December 4th.  All other snowfall events have
totaled well under 2 inches. 
 
Some very light flurries began and ended again this morning and 
were occurring with dimmed sunshine. However, by early afternoon
they were gone and under cloudy skies our visibility was up 
to 40 miles. 
 
Today's observations:
 
7 A.M.   
Weather: Broken middle and high clouds 
Temperature: 28F, Dew point: 27F, Wind: W at 06 kts 
Sea-level pressure: 29.80 inches Hg, rising 
Visibility: 10 miles, thin fog  
6-hourly min. temp. 27 deg. 
24-hourly snowfall: 2.0 ins. 
Snow depth: 3 inches
BHO SA 1155 E90 BKN 250 BKN 10 128/28/27/2806/991/ 
SC/CUFRM TOPS NE-E THN F BLO INVSN ALQDS ESTMTD TOP 
6 HND OVR CTY N PTCHS DENSE F 12 SW THN K LYR ALG HRZN NE
TOTAL NEW SNW PST 24 HRS 2.0 INS/ 8/571 4/003 53008
MANUAL 70019 ASOS 70019 10029 20027  
 
10 A.M.    
Weather: Overcast partly thin with dimmed sunshine
The 7000 overcast was of mostly opaque virga
Light snow showers, very light
Temperature: 34F, Dew point: 28F, Wind: W at 04 kts  
Sea-level pressure: 29.95 inches Hg, rising 
Visibility: 9 miles   
3-hourly precip and snowfall: trace
BHO SA 1455 30 SCT E70 OVC 9SW- 140/34/28/2704/995/ 70 OVC VIRGA 
OVC PTLY THN PCPN VRY LGT/ 8/5// 51012 MANUAL 6000/ 
 
1 P.M.    
Weather:  Overcast with breaks  
Temperature: 36F, Dew point: 28F, Wind: W at 04 kts  
Sea-level pressure: 29.91 inches Hg, falling  
Visibility: 40 miles  
6-hourly max. temp. 39 deg. 
6-hourly snowfall: trace 
6-hourly precip: trace
BHO SA 1755 E28 OVC 40 130/36/28/2604/991 FEW LWR CU 
BINOVC ALQDS HIER CLD AC/ACSL VSB NE-E/ 8/84/ 58010 MANUAL 6000/ 
10039 20028 
 
WEATHER SUMMARY FOR MONDAY, FEBRUARY 26
 
TEMPERATURE (DEGREES F)
MAX.....33    NORMAL.....39 
MIN.....28    NORMAL.....22   
MEAN....31    NORMAL.....31
 
DEPARTURE FROM 30-YEAR NORMAL...........0
TOTAL DEPARTURE FOR THE MONTH........-126 (-5.0 DEGREES/DAY) 
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY..........34   DEPARTURE........ 0
TOTAL HEATING UNITS FOR THE MONTH........1086   DEPARTURE......+120 
TOTAL HEATING UNITS FOR THE SEASON.......4030   DEPARTURE......-472
TOTAL HEATING UNITS LAST SEASON TO DATE..3995   DIFFERENCE......+35
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............23 NNE AT  2:31 P.M. *      
                   AEROVANE.............20 NNE AT  3:03 P.M. *     
                   ASOS.................18  NE AT  3:11 P.M.      
                   DAVIS................19   N AT 11:41 A.M.       
FASTEST MILE FOR YESTERDAY..............14 NNE AT 2:31 P.M.    
MAXIMUM 2-MINUTE ASOS AVERAGE...........14   N AT  1:04 A.M.      
MAXIMUM 2-MINUTE DAVIS AVERAGE..........14 NNE AT  2:52 P.M.     
AVERAGE WIND SPEED AND DIRECTION...... 7.6 NNE 
                    ASOS.............. 7.8      
                    DAVIS............. 7.1 NNE [020 deg] 
* last of several occurrences....
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.19  DEPARTURE.....+0.04
                         ASOS..............0.19
TOTAL PRECIPITATION FOR THE MONTH..........2.78  DEPARTURE.....-0.98  
                         ASOS..............2.76    
TOTAL PRECIPITATION FOR THE YEAR...........5.72  DEPARTURE.....-2.82  
                         ASOS..............5.63
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........2.0  DEPARTURE......+1.5
TOTAL SNOWFALL FOR THE MONTH................7.3  DEPARTURE......-7.7  
TOTAL SNOWFALL FOR THE SEASON..............13.9  DEPARTURE.....-30.5 
 
PRELIMINARY CLIMATE SUMMARY FOR FEBRUARY 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
 
2/1  35/20/28/+2/0/0/126/21         37 S    Aero 34 MPH S
2/2  35/28/32/+6/0.18/0.3/000/00    20 NW
2/3  32/19/26/0/0.05/0.4/574/95     39 W    Aero 47 MPH W  
2/4  22/10/16/-10/0/0/601/99        39 WSW  Aero 40 MPH WSW
2/5  16/5/11/-16/0/0/493/81         61 W    Aero 60 MPH W  
2/6  24/10/17/-10/0/0/593/97        38 W    Aero 36 MPH W 
2/7  21/8/15/-12/0/0/474/77         43 W    Aero 41 MPH W
2/8  25/11/18/-9/0/0/370/60         48 WSW
2/9  26/15/21/-6/0/0/600/97         44 WSW  Aero 42 MPH WSW
2/10 32/13/23/-4/0/0/199/32         28 W     
2/11 31/14/23/-4/0/0/456/73         27 SSW  
2/12 36/20/28/0/0/0/602/96          43 WSW  Aero 40 MPH W  
2/13 22/6/14/-14/0.02/0.2/226/36    28 NW   
2/14 36/13/25/-3/2.09/1.4/000/00    47 NE   Aero 52 MPH NE
2/15 21/9/15/-13/0/0/616/97         46 W    Aero 53 MPH W
2/16 27/9/18/-10/0/0/624/98         51 W    Aero 49 MPH W
2/17 34/17/26/-3/0/0/596/93         42 W
2/18 33/16/25/-4/0/0/289/45         38 WNW  Aero 40 MPH WNW  
2/19 20/5/13/-16/0/0/646/100        46 WNW  Aero 51 MPH WNW 
2/20 48/17/33/+4/T/0/266/41         35 SSW  Aero 34 MPH SSW  
2/21 44/30/37/+8/0.01/0/606/93      29 W     
2/22 39/28/34/+4/0.02/0.2/007/01    22 SSE   
2/23 32/14/23/-7/0.10/1.3/466/71    55 WNW  Aero 56 MPH WNW
2/24 33/11/22/-8/0/0/652/99         40 WNW  Aero 43 MPH WNW 
2/25 41/19/30/-1/0/0/617/93         22 WNW  
2/26 33/28/31/0/0.31/3.5/000/00     23 NNE
 
2/27 morning low temp. 27 deg; normal low now 23 deg
     there are 3 inches of snow on the ground 
       
2/14 - NEW RECORD DAILY PRECIPITATION OF 2.09 INCHES;  
     the previous record was 1.95 inches in 1940.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR FEBRUARY 27
HIGH 61F IN 1976
LOW -8F IN 1900
PRECIP 0.90 INCHES IN 1922
SNOWFALL 6.0 INCHES IN 1922
PEAK GUST 67 MPH W IN 1985
 
RECORDS FOR FEBRUARY 28
HIGH 62F IN 1976
LOW -2F IN 1907,1934
PRECIP 1.79 INCHES IN 1958
SNOWFALL 8.5 INCHES IN 2005
PEAK GUST 88e MPH SSW IN 1943
 
TODAY'S REPORT By: Robert Skilling