BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, APRIL 14, 2010 
ALL TIMES ARE IN EASTERN STANDARD TIME
 
A VERY SUNNY, MILD AND VERY DRY APRIL DAY
SUNSHINE UP TO NEARLY 70% OF POSSIBLE THIS MONTH
TEMPERATURES STILL 12 DEGREES ABOVE NORMAL
RELATIVE HUMIDITY DOWN TO 17% EARLY AFTERNOON
 
Today is another very sunny day with warmer
temperatures than yesterday rising to the
mid-60's by early this afternoon. Half of the
days this month have had over 80% of the
possible bright sunshine with the average
sunshine for April now almost up to 70%. 
The remarkably warm April continues still
averaging near 12 degrees above the normal.
Today is also a very dry day with the dew
point temperature and relative humidity
dropping into the upper teens.
 
Today's observations:
 
7 A.M.
Weather: Thin broken cirrus clouds  
Temperature: 42F, Dew point: 30F, Wind: WNW at 7 kts
Sea-level pressure: 30.51 inches Hg, rising
Visibility: 60 miles, 70 miles northwest, thin smoke layer
along horizon NNW-NE and SSW-SW 
6-hour minimum temp: 37F
24-hour precipitation: 0.00 inches
BHO SA 1155 300 –BKN 60 332/42/30/2907/051/
THN K LYR ALG HRZN NNW-NE AND SSW-SW VSBY NW 70/
8/001 53012 10042 20037
 
10 A.M.
Weather: Thin scattered cirrus
Temperature: 56F, Dew point: 18F, Wind: WNW at 12 kts,
Wind: Direction variability WSW to NNW
Sea-level pressure: 30.51 inches Hg, falling
Visibility: 75 miles  
BHO SA 1455 250 –SCT 300 –SCT 75 333/56/18/3012/051/
WND 25V33/ 8/001 50001
 
1 P.M.
Weather: Clear, cirrus north thru southeast
Temperature: 63F, Dew point: 18F, Wind: WSW at 8G15 kts,
Wind: Direction variable SSW to WNW
Sea-level pressure: 30.42 inches Hg, falling
Visibility: 75 miles
6-hour maximum temp: 63F
BHO SA 1755 CLR 75 303/63/18/2508G15/042/ CI N-SE
WND 22V30/ 8/001 58030 10063 20042
 
WEATHER SUMMARY FOR TUESDAY, APRIL 13
 
TEMPERATURE (DEGREES F)
MAX.....56     NORMAL.....54
MIN.....39     NORMAL.....36
MEAN....48     NORMAL.....45
 
DEPARTURE FROM 30-YEAR AVERAGE................+3
TOTAL DEPARTURE FOR THE MONTH...............+163 (+12.3 DEGREES/DAY)
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............17    DEPARTURE........-3
TOTAL HEATING UNITS FOR THE MONTH...........122    DEPARTURE......-160
TOTAL HEATING UNITS FOR THE SEASON.........5218    DEPARTURE......-528
TOTAL HEATING UNITS LAST SEASON TO DATE....5690    DIFFERENCE.....-472
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............23 S   AT  10:08 P.M.  
                   AEROVANE..............25 S   AT  10:08 P.M.      
                   ASOS..................23 S   AT  10:08 P.M.   
                   DAVIS.................21 S   AT   8:38 P.M.  
THE FASTEST MILE FOR YESTERDAY...........16 S   AT  10:31 P.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE............17 SSE AT  10:23 P.M.   
MAXIMUM 2-MINUTE DAVIS AVERAGE...........15 S   AT  10:29 P.M.         
AVERAGE WIND SPEED AND DIRECTION..........8.7 NNE
                   ASOS.................. 8.7  
                   DAVIS..................8.0 ENE {060 DEG]
* last of several occurrences.... 
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.15
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........1.12  DEPARTURE......-0.83
                         ASOS..............1.10
TOTAL PRECIPITATION FOR THE YEAR..........29.03  DEPARTURE.....+13.45
                         ASOS.............29.20
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE......-0.1
TOTAL SNOWFALL FOR THE MONTH................0.0  DEPARTURE......-1.4
TOTAL SNOWFALL FOR THE SEASON..............64.4  DEPARTURE......+6.1
 
PRELIMINARY CLIMATE SUMMARY FOR APRIL 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
 
4/1  59/43/51/+10/T/0/359/47        24 NNW   AERO 30 MPH NNW
4/2  67/46/57/+15/0.00/0/728/95     21 SSE
4/3  75/45/60/+18/0.00/0/731/95     26 SSE
4/4  76/45/61/+19/0.00/0/617/80     27 W     AERO 29 MPH W 
4/5  72/53/63/+20/0.00/0/635/82     37 SSE   AERO 40 MPH SSE
4/6  68/50/59/+16/T/0/202/26        23 W    
4/7  90/45/68/+25/0.00/0/578/74     36 WSW   AERO 41 MPH WSW
4/8  65/45/55/+11/.../0/611/78      31 ENE
4/9  56/37/47/+3/1.12/0/000/00      35 W     AERO 39 MPH W
4/10 56/37/47/+3/0.00/0/663/84      45 W     AERO 52 MPH W
4/11 69/47/58/+13/0.00/0/506/64     36 W     AERO 40 MPH W
4/12 61/43/52/+7/0.00/0/635/80      31 W     AERO 33 MPH W
4/13 56/39/48/+3/0.00/0/613/77      23 S     
 
4/14 our morning low temp: 37F; the normal low is now 37F
 
NEW DAILY RECORDS FOR APRIL 2010
4/4 - new record high maximum temperature of 76F;
surpasses 71F in 1950.
4/5 - new record high minimum temperature of 53F;
surpasses 52F in 1981
4/7 - new record high maximum temperature of 90F;
surpasses 86F in 1929
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR APRIL 14
HIGH 80 IN 1945
LOW 21 IN 1923
PRECIP 2.22 IN. IN 1895
SNOWFALL 8.4 IN. IN 1953
PEAK GUST 71e MPH W IN 1943
 
RECORDS FOR APRIL 15
HIGH 81 IN 1896
LOW 23 IN 1943
PRECIP 1.75 IN. IN 2007
SNOWFALL 1.0 IN. IN 1916, 1962
PEAK GUST 66 MPH E IN 2007      
 
TODAY'S REPORT PREPARED BY: Robert Skilling