BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, FEBRUARY 17, 2009
ALL TIMES ARE IN EASTERN STANDARD TIME
 
Today's observations:
 
7 A.M.
Weather: Clear, stratocumulus layer distant NE-E, few
altocumulus all quadrants, lenticularis NE-E, few cirrus
Temperature: 20F, Dew point: 13F, Wind: NW at 12 kts
Sea-level pressure: 30.22 inches Hg, rising
Visibility: 50 miles
6-hour minimum temperature: 19F
Snow depth on ground: trace
BHO SA 1155 CLR 50 234/20/13/3212/022/ SC LYR DSNT NE-E
FEW AC ALQDS ACSL NE-E FEW CI/ 8/541 52010 10024 20019
 
10 A.M.
Weather: Clear, lone cumulus N, stratocumulus layer NE-SE,
altocumulus lenticularis E-Se, few cirrus all quadrants
Temperature: 29F, Dew point: 16F, Wind: WNW at 6 kts,
Wind: Light and variable
Sea-level pressure: 30.22 inches Hg, falling
Visibility: 50 miles
BHO SA 1455 CLR 50 232/29/16/3006/022/ LONE CU N
SC LYR NE-SE AC/ACSL E-SE FEW CI ALQDS WND L/V/ 8/841 58002
 
1 P.M.  
Weather: Clear, stratocumulus layer NE-SE, cumulus
forming all quadrants, few cirrus
Temperature: 34F, Dew point: 16F, Wind: NW at 7 kts,
Wind: Variable direction WSW to N
Sea-level pressure: 30.18 inches Hg, falling
Visibility: 70 miles
6-hour maximum temperature: 34F
BHO SA 1755 CLR 70 220/34/16/3107/018/ SC LYR NE-SE
CU FRMG ALQDS FEW CI WND 25V01/ 8/801 58012 10034 20020
 
WEATHER SUMMARY FOR MONDAY, FEBRUARY 16
 
TEMPERATURE (DEGREES F)
MAX.....35    NORMAL.....36
MIN.....21    NORMAL.....20
MEAN....28    NORMAL.....28
 
DEPARTURE FROM 30-YEAR NORMAL..................0
TOTAL DEPARTURE FOR THE MONTH................+46 [+2.7 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............37  DEPARTURE..........0
TOTAL HEATING UNITS FOR THE MONTH............561  DEPARTURE........-49
TOTAL HEATING UNITS FOR THE SEASON..........4129  DEPARTURE........-17
TOTAL HEATING UNITS LAST SEASON TO DATE.....3771  DIFFERENCE......+358
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............23 NW  AT 12:29 A.M.
                   AEROVANE.............20 NW  AT 12:51 A.M. *
                   ASOS.................21 NNW AT 12:52 A.M.    
                   DAVIS................24 WNW AT 12:51 A.M.    
FASTEST MILE FOR YESTERDAY..............14 NW  AT  1:00 A.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE...........15 NNW AT 12:56 A.M.    
MAXIMUM 2-MINUTE DAVIS AVERAGE..........16 WNW AT 12:56 A.M.    
                   AVERAGE.............8.4 NW
                   ASOS................8.3
                   DAVIS...............8.7 NNW [333 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...........0.62  DEPARTURE.........-1.69
                         ASOS...............0.62
TOTAL PRECIPITATION FOR THE YEAR............4.78  DEPARTURE.........-2.31
                         ASOS...............5.82 #
# Includes erroneous ASOS precipitation data on 1/1/09 and 1/2/09
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0   DEPARTURE.........-0.5
TOTAL SNOWFALL FOR THE MONTH................6.5   DEPARTURE.........-3.5
TOTAL SNOWFALL FOR THE SEASON..............61.6   DEPARTURE........+22.2
 
PRELIMINARY CLIMATE SUMMARY FOR FEBRUARY 2009 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane recording wind system gust when significant
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
2/1  45/15/30/+4/0/0/402/67          35 SW
2/2  50/32/41/+15/0/0/568/94         29 NNW
2/3  33/22/28/+2/0.44/5.6/000/00     39 N    AERO 38 MPH N 
2/4  24/10/17/-9/0.05/0.9/572/94     37 WNW
2/5  17/3/10/-17/0/0/538/88          33 W
2/6  26/4/15/-12/0/0/509/83          26 W
2/7  42/16/29/+2/0/0/314/51          45 S    AERO 44 MPH S
2/8  49/30/40/+13/0/0/433/70         54 W    AERO 54 MPH W
2/9  37/21/29/+2/0/0/621/100         38 WNW  AERO 38 MPH WNW
2/10 36/22/29/+2/0/0/006/01          21 SSE
2/11 59/34/47/+20/0/0/482/77         29 SSE  AERO 24 MPH SSE
2/12 51/37/44/+16/0.13/0/.../..      54 WSW  AERO 54 MPH WSW
2/13 38/24/31/+3/0/.../..            47 W    AERO 47 MPH W
2/14 39/20/30/+2/0/0/.../..          42 W    AERO 40 MPH W
2/15 39/23/31/+3/0/0/637/100         30 NW   AERO 28 MPH NW
2/16 35/21/28/0/0/0/.../..           23 NW   AERO 20 MPH NW
 
2/17 morning low temp: 19F; our normal low is now 21F
 
NEW DAILY RECORDS FOR FEBRUARY 2009...
 
None to date
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR FEBRUARY 17
HIGH 61F IN 1981
LOW -16F IN 1896
PRECIP 1.86 INCHES IN 2003
SNOWFALL 20.0 INCHES IN 2003
PEAK GUST 72 MPH NW IN 1968
 
RECORDS FOR FEBRUARY 18
HIGH 65F IN 1981
LOW -10F IN 1958
PRECIP 1.97 INCHES IN 1887
SNOWFALL 9.2 INCHES IN 1952
PEAK GUST 65e MPH NNW IN 1952
 
TODAY'S REPORT PREPARED By: Stephanie Radner