BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, APRIL 1, 2010 
ALL TIMES ARE IN EASTERN STANDARD TIME
 
MARCH 2010 HAS BECOME THE WETTEST OF ANY
MONTH ON OUR ENTIRE RECORD SINCE 1885
WITH A TOTAL OF 18.81 INCHES!
 
MARCH 2010 HAS BECOME THE FOURTH WARMEST
MARCH ON RECORD WITH A MEAN TEMPERATURE
OF 41.5 DEGREES!
 
Greatest monthly precipitation (inches)
 
1.  18.81 in March 2010
2   18.78 in August 1955
3.  17.32 in June 1998 
4.  14.72 in October 2005
5.  13.73 in June 1982
6.  13.07 in March 2001  
7.  12.60 in December 1969
8.  12.37 in September 1999
9.  12.31 in June 2006 
10. 11.76 in October 1996    
 
All rainfall data have been recorded in the
8-inch non-recording rain gage. The storm
total for 29-31 March is 5.64 inches. ASOS
(Automated Surface Observation System) reports
5.77 inches for the storm total and 18.98 inches
for the March total.
 
Greatest March precipitation (inches)
 
1. 18.81 in 2010
2. 13.07 in 2001
3. 10.96 in 1968
4. 10.02 in 1983
5.  9.53 in 1953
 
Warmest March Mean Temperature, corrected (deg F)
 
1. 43.5 in 1946
2. 42.7 in 1945
3. 42.2 in 1903
4. 41.5 in 2010
5. 41.2 in 1921
6. 40.8 in 2000
7. 40.7 in 1977
 
Today's observations:
 
7 A.M.
Weather: Overcast stratocumulus, few cumulus fractus
southwest thru north-northwest, line of clearing
north thru northeast and east thru south
Temperature: 45F, Dew point: 42F, Wind: N at 9 kts
Wind: Direction variable west-northwest thru north-northeasat
Sea-level pressure: 30.08 inches Hg, rising
Visibility: 45 miles
6-hour minimum temp: 44F
24-hour precip: Trace 
Storm total: 5.64 ins.
BHO SA 1155 E15 OVC 45 185/45/42/0109/008/ THN K LYR N
FEW CUFRA SW-NNW LINE CLRG N-NE AND E-S WND 30V02/ 8/5//
51022 MANUAL 6000/ 10045 20044
 
10 A.M.
Weather: Overcast stratocumulus
Temperature: 50F, Dew point: 43F, Wind: N at 8 kts,
Wind: Direction variable northwest thru north-northeast
Sea-level pressure: 30.10 inches Hg, rising
Visibility: 45 miles
BHO SA 1455 E15 OVC 45 193/50/43/3508/010/
WND 31V03/ 8/5// 50008
 
1 P.M.
Weather: Thin scattered cirrus, few stratocumulus
east-southeast thru south-southeast and south-southwest
thru north, distant stratocumulus layer offshore
northeast thru southeast
Temperature: 55F, Dew point: 44F, Wind: NNW at 5 kts,
Wind: Light and variable
Sea-level pressure: 30.08 inches Hg, falling
Visibility: 45 miles 
6-hour maximum temp: 55F 
BHO SA 1755 250 –SCT 45 185/55/44/3405/008/ FEW SC ESE-SSE
AND SSW-N DSNT SC LYR ALG/OFFSHR DSNT NE-SE WND LGT AND VRB/
8/501 58008 10055 20045
 
WEATHER SUMMARY FOR WEDNESDAY, MARCH 31
 
TEMPERATURE (DEGREES F)
MAX.....47     NORMAL.....50
MIN.....40     NORMAL.....32
MEAN....44     NORMAL.....41
 
DEPARTURE FROM 30-YEAR AVERAGE..............+3
TOTAL DEPARTURE FOR THE MONTH.............+194 [+6.1 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............21    DEPARTURE........-3
TOTAL HEATING UNITS FOR THE MONTH...........696    DEPARTURE......-198
TOTAL HEATING UNITS FOR THE SEASON.........5096    DEPARTURE......-368
TOTAL HEATING UNITS LAST SEASON TO DATE....5418    DIFFERENCE.....-322
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............20 NNE AT   3:47 P.M. 
                   AEROVANE..............21 NNE AT   3:48 P.M.
                   ASOS..................20 NNE AT   3:48 P.M.   
                   DAVIS.................21 N   AT   3:47 P.M.  
THE FASTEST MILE FOR YESTERDAY...........12 NNE AT   3:04 P.M.  
MAXIMUM 2-MINUTE ASOS AVERAGE............14 NE  AT   3:05 P.M.   
MAXIMUM 2-MINUTE DAVIS AVERAGE...........13 NNE AT   3:05 P.M.    
AVERAGE WIND SPEED AND DIRECTION.........7.6 NNE 
                   ASOS..................7.5
                   DAVIS.................7.5 NNE [029 DEG]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M...Trace  DEPARTURE......-0.15
                         ASOS..............0.00
TOTAL PRECIPITATION FOR MARCH.............18.81  DEPARTURE.....+14.02
                         ASOS.............18.98
TOTAL PRECIPITATION FOR THE YEAR..........27.91  DEPARTURE.....+14.28
                         ASOS.............28.10
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE......-0.2
TOTAL SNOWFALL FOR MARCH....................7.9  DEPARTURE......-3.6
TOTAL SNOWFALL FOR THE SEASON..............64.4  DEPARTURE......+7.5
 
PRELIMINARY CLIMATE SUMMARY FOR MARCH 2010 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust when significant
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
3/1  44/33/38/+6/0.38/3.2/047/07    43 NW    AERO 42 MPH NW
3/2  43/32/38/+6/0/0/352/52         22 NNE
3/3  34/31/33/+1/0.18/1.7/000/00    45 NNE   AERO 43 MPH NNE 
3/4  33/30/32/-1/0.19/1.9/000/00    32 NNW
3/5  39/28/34/+1/0.06/0.5/226/33    28 N
3/6  54/27/41/+8/0/0/689/100        25 WNW
3/7  55/31/43/+10/0/0/684/99        28 W
3/8  58/36/47/+13/0/0/680/98        38 W
3/9  51/32/42/+8/0/0/656/94         31 WNW
3/10 53/30/42/+8/0/0/672/96         19 SE
3/11 46/35/41/+6/0.04/0/049/07      17 ENE  
3/12 45/36/41/+6/T/0/007/01         26 NE   
3/13 39/36/38/+3/1.60/0/000/00      53 NE    AERO 50 MPH NE
3/14 45/38/42/+6/4.95/T/000/00      68 ENE   AERO 67 MPH ENE 
3/15 40/34/37/+1/2.86/0.2/000/00    53 NNE   AERO 52 MPH NNE
3/16 49/34/42/+6/0/0/653/91         38 N     AERO 35 MPH N
3/17 65/38/52/+15/0/0/698/97        24 WSW   AERO 22 MPH WSW
3/18 65/43/54/+17/0/0/658/91        36 WSW   AERO 32 MPH WSW
3/19 70/46/58/+21/0/0/661/91        23 SSW
3/20 71/47/59/+21/0/0/633/87        28 WSW
3/21 55/38/47/+9/0/0/643/88         26 NE
3/22 42/38/40/+2/0.05/0/000/00      36 NNE
3/23 44/39/42/+4/2.52/0/000/00      39 NNE
3/24 50/36/43/+4/0/0/511/69/        48 W     AERO 50 MPH W
3/25 64/38/51/+12/T/0/468/63/       32 S     AERO 37 MPH SSW
3/26 50/26/38/-1/0.26/0.4/.../..    32 NW    AERO 35 MPH NW
3/27 39/21/30/-10/0/0/.../..        27 N   
3/28 46/25/36/-4/0/0/.../..         29 SSE
3/29 52/42/47/+7/2.65/0/000/00      52 SE    AERO 49 MPH SE
3/30 52/42/47/+6/2.92/0/000/00      46 ENE   AERO 51 MPH ENE
3/31 47/40/44/+3/T/0/.../..         20 NNE   AERO 21 MPH NNE
 
4/1 our morning low temp: 45F; the normal low is now 33F
 
NEW DAILY RECORDS FOR MARCH 2010
3/14 - new daily record rainfall of 4.95 ins.
surpasses the previous record of 1.72 ins. in 1974
3/14 - new daily record peak wind gust of 67 MPH ENE
surpasses the previous record of 66 MPH WNW in 1982
3/15 - new daily record rainfall of 2.86 ins.
surpasses the previous record of 1.33 ins. in 1972
3/19 - new record high maximum temperature of 70F;
the previous record was 69F in 1903.
3/20 - new record high minimum temperature of 47F;
the previous record was 46F in 1976.
3/23 - new daily record rainfall of 2.52 ins.
surpasses the previous record of 1.58 ins. in 1903
3/30 - new daily record rainfall of 2.92 ins.
surpasses the previous record of 2.82 ins. in 2001
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR APRIL 1
HIGH 74 IN 1967
LOW 6 IN 1923 [RECORD FOR MONTH]
PRECIP 3.47 IN. IN 2004 [RECORD FOR MONTH]
SNOWFALL 15.0 IN. IN 1997 [RECORD FOR MONTH]
PEAK GUST 75 MPH SSW IN 1962
 
RECORDS FOR APRIL 2
HIGH 77 IN 1967
LOW 14 IN 1919
PRECIP 1.83 IN. IN 1970
SNOWFALL 13.0 IN. IN 1887
PEAK GUST 76 MPH SSW IN 1970
 
TODAY'S REPORT PREPARED BY: Sean Fankhauser/Stephanie Radner
 
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