BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, MARCH 9, 2009
ALL TIMES ARE IN EASTERN STANDARD TIME
 
RAIN CHANGED TO SNOW AND SLEET THIS MORNING
SNOWFALL ACCUMULATION NEAR 2 INCHES AT 2 P.M. EDT
 
After warm temperatures over the weekend with a high
of 60F on Saturday and 57F yesterday wintry weather
has returned this morning.  Light rain began during
the early morning hours and changed to sleet and snow
before 8 a.m. The accumulation was 0.4 inch at 8 a.m.
and reached 1.7 inches by ending time at 9:20 a.m.  
 
Snow began again early this afternoon and had accumulated
an additional 0.2 inch by 2 p.m. EDT. This brings the
daily total to 1.9 inches.   
 
Today's observations:
 
7 A.M.
Weather: Obscurement with heavy fog, very light sleet
occurring, snow ended 6:40 a.m. 
Temperature: 32F, Dew point: 32F, Wind: NE at 15 kts,
Wind: gust to 24 kts past hour 
Sea-level pressure: 29.94 inches Hg, falling
Visibility: 1/8 mile 
6-hour minimum temperature: 32F
6-hour precip: 0.37 in.
6-hour snowfall: 0.4 in.
24-hour precip. 0.37 in. 
24-hour snowfall: 0.4 in.  
Snow depth on ground: trace
BHO SA 1155 W3 X 1/8IP-F 138/32/32/0515/994/
GST TO 24 KTS PST HR PCPN VRY LGT REIPSBUKN
SEUKN TOTAL NEW SNW PST 24 HRS 0.4 IN/ 8////
50003 ASOS 60036 MANUAL 6037/ ASOS 70036
MANUAL 70037 10042 20032
 
10 A.M.
Weather: Obscurement with heavy fog, snow ended past hour
Temperature: 32F, Dew point: 32F, Wind: NE at 14G24 kts,
Wind: Peak wind ENE at 29 kts at 9:17 a.m.,
Wind: wind direction variable N-ENE  
Sea-level pressure: 29.92 inches Hg, rising
Visibility: 1/16 mile
3-hourly precip: 0.20 in.
3-hourly snowfall: 1.3 ins.
BHO SA 1455 W2 X 1/16F 131/32/32/0414G24/992/
SE10 PK WND 0629/17/ WND 36V06 TOTAL NEW SNW
PST 3 HRS 1.3 INS/ 8//// 55007 ASOS 60020
MANUAL 6020/
 
1 P.M.  
Weather: Obscurement with light snow and heavy fog, snow wet
Temperature: 32F, Dew point: 32F, Wind: NNE at 14G27 kts,
Wind: Peak wind gust 28 kts NNE at 12:44 p.m. 
Sea-level pressure: 29.92 inches Hg, rising
Visibility: 1/8, light snow and fog 
6-hour maximum temperature: 32F
6-hour precip: N/A (ASOS = 0.23)
6-hour snowfall: 1.5 ins.
BHO SA 1755 W3 X 1/8S-F 133/32/32/0314G27/992/
LESB30 SNW WET PK WND 0228/44/ WND 35V06 TOTAL NEW SNW
PST 6 HRS 1.5 INS/ 8//// 53002 ASOS 60023
MANUAL 6//// 10032 20031
 
WEATHER SUMMARY FOR SUNDAY, MARCH 8, 2009
 
TEMPERATURE (DEGREES F)
MAX.....57    NORMAL.....42
MIN.....42    NORMAL.....25
MEAN....50    NORMAL.....34
 
DEPARTURE FROM 30-YEAR NORMAL.................+16
TOTAL DEPARTURE FOR THE MONTH.................-13 [-1.8 DEGREES/DAY] 
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............15  DEPARTURE........-16
TOTAL HEATING UNITS FOR THE MONTH............271  DEPARTURE........+11
TOTAL HEATING UNITS FOR THE SEASON..........4798  DEPARTURE........-32
TOTAL HEATING UNITS LAST SEASON TO DATE.....4459  DIFFERENCE......+339
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............39 WNW AT  9:55 A.M.
                   AEROVANE.............40 WNW AT  9:55 A.M. 
                   ASOS.................39 WNW AT  9:56 A.M.
                   DAVIS................40  S  AT  2:27 A.M.
FASTEST MILE FOR YESTERDAY..............28 WNW AT  9:55 A.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...........29 WNW AT  9:56 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..........30 WNW AT  9:56 A.M.
                   AVERAGE............15.3 WNW 
                   ASOS...............14.4
                   DAVIS..............15.1 W [270 DEGREES]
  
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.37 DEPARTURE.........+0.22
                         ASOS...............0.36
TOTAL PRECIPITATION FOR THE MONTH...........1.91 DEPARTURE.........+0.71
                         ASOS...............1.76
TOTAL PRECIPITATION FOR THE YEAR............8.44 DEPARTURE.........-1.60
                         ASOS...............9.38 #
# Includes erroneous ASOS precipitation data on 1/1/09, 1/2/09 and 2/27/09.
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.4   DEPARTURE......... 0.0
TOTAL SNOWFALL FOR THE MONTH...............10.6   DEPARTURE.........+6.8
TOTAL SNOWFALL FOR THE SEASON..............75.9   DEPARTURE........+26.7
 
PRELIMINARY CLIMATE SUMMARY FOR MARCH 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
 
3/1  28/21/25/-7/0.26/1.9/000/00     38 NNE
3/2  22/15/19/-13/1.16/8.2/000/00    40 NNE    AERO 37 MPH NNE
3/3  25/11/18/-14/0.01/0.1/640/94    33 NW
3/4  30/6/18/-14/0/0/684/100         31 WNW
3/5  39/16/28/-5/0/0/659/96          25 WSW
3/6  49/30/40/+7/T/0/.../..          43 S      AERO 41 MPH S
3/7  60/42/51/+18/.../.../.../..     37 S
3/8  57/42/50/+16/0/0/.../..         39 WNW    AERO 40 MPH WNW
 
3/9  morning low temp: 32F; our normal low is now 26F
 
NEW DAILY RECORDS FOR MARCH 2009...
3/2: DAILY SNOWFALL 8.2 INS. SURPASSES PREVIOUS
     RECORD OF 7.1 INS. IN 1948
3/7: DAILY MINIMUM 42 TIES RECORD HIGH MINIMUM FOR DATE
     PREVIOUSLY SET IN 1974 AND 1987
3/8: DAILY MINIMUM 42 TIES RECORD HIGH MINIMUM FOR DATE
     PREVIOUSLY SET IN 1995
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR MARCH 9
HIGH 71 IN 2000
LOW 1 IN 2007
PRECIP 2.67 INS. IN 1998
SNOWFALL 6.3 INS. IN 2001
PEAK GUST 102e MPH S IN 1942 [RECORD FOR MONTH]
 
RECORDS FOR MARCH 10
HIGH 69 IN 1977
LOW 2 IN 1984
PRECIP 2.00 INS. IN 1994
SNOWFALL 4.0 INS. IN 1997
PEAK GUST 80 MPH NW IN 1974
 
TODAY'S REPORT PREPARED BY: Robert Skilling