BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, APRIL 14, 2009
ALL TIMES ARE IN EASTERN STANDARD TIME 
 
SUNNY WITH SEASONABLE TEMPERATURES
 
Today's sunshine and temperatures are close to
the average along with light winds, which is a
welcome change from the chilly and gusty
winds of the past several days. 
 
Today's weather observations: 
 
7 A.M.
Weather: Scattered altocumulus, thin scattered cirrus and
cirrostratus, cloudy layer SE-SW receding, sky clearing 
Temperature: 41F, Dew point: 19F, Wind: NNW at 6 kts,
Sea-level pressure: 30.12 inches Hg, rising
Visibility: 60 miles, 70 miles to northwest  
6-hour minimum temperature: 37F
BHO SA 1155 160 SCT 220 SCT 250 –SCT 300 –SCT 60 198/41/19/3306/012/
AC/LWR CI SE-SW SKY CLRG PST HR VSBY NW 75/ 8/038 51016 10041 20037 
           
10 A.M.
Weather: Scattered altocumulus (layer SE-SW), scattered cirrus    
Temperature: 50F, Dew point: 16F, Wind: Calm
Sea-level pressure: 30.09 inches Hg, falling
Visibility: 70 miles  
BHO SA 1455 150 SCT 250 SCT 70 190/50/16/0000/009/
AC LYR SE-SW/ 8/031 57008
 
1 P.M. 
Weather: Scattered dense cirrus, altocumulus and
altocumulus lenticularis distant to the southeast
thru southwest, lower dense cirrus SE-SW,
thin broken cirrus  
Temperature: 57F, Dew point: 19F, Wind: SW at 4 kts,
Wind: Light 
Sea-level pressure: 30.05 inches Hg, falling
Visibility: 70 miles
6-hourly max. temp: 57F
BHO SA 1755 220 SCT 250 –BKN 300 –BKN 70 175/57/19/2304/005/
AC/ACSL DSNT SE-SW LWR DENS CI SE-SW WND LGT/ 8/042 57015 10057 20041 

 
WEATHER SUMMARY FOR MONDAY MONDAY, APRIL 13, 2009
 
TEMPERATURE (DEGREES F)
MAX.....52    NORMAL......54
MIN.....29    NORMAL......36
MEAN....41    NORMAL......45
 
DEPARTURE FROM 30-YEAR NORMAL..................-4
TOTAL DEPARTURE FOR THE MONTH.................+10  [+0.6 DEGREE/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............24  DEPARTURE........+4
TOTAL HEATING UNITS FOR THE MONTH............272  DEPARTURE.......-10
TOTAL HEATING UNITS FOR THE SEASON..........5690  DEPARTURE.......-56
TOTAL HEATING UNITS LAST SEASON TO DATE.....5402  DIFFERENCE.....+288
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............38 W   AT  3:47 P.M.   
                   AEROVANE.............35 W   AT  3:47 P.M. *   
                   ASOS.................36 W   AT  3:47 P.M.   
                   DAVIS................39 W   AT  3:46 P.M.     
FASTEST MILE FOR YESTERDAY..............28 WNW AT 11:13 A.M. *   
MAXIMUM 2-MINUTE ASOS AVERAGE...........28 WNW AT 11:13 A.M.     
MAXIMUM 2-MINUTE DAVIS AVERAGE..........30 W   AT  9:22 A.M.   
                   AVERAGE............16.0 W 
                   ASOS...............14.3
                   DAVIS..............16.6 W [280 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...........3.23 DEPARTURE.........+1.28
                         ASOS...............3.28
TOTAL PRECIPITATION FOR THE YEAR...........13.31 DEPARTURE.........-2.27
                         ASOS..............14.41 #
# 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..........0.0   DEPARTURE.........-0.1
TOTAL SNOWFALL FOR THE MONTH................0.2   DEPARTURE.........-1.2
TOTAL SNOWFALL FOR THE SEASON..............78.9   DEPARTURE........+20.6
 
PRELIMINARY CLIMATE SUMMARY FOR APRIL 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
 
4/1  43/31/38/-3/0.13/0/015/02       24 SE    
4/2  52/39/46/+4/0.02/0/000/00       20 SSE       
4/3  58/45/52/+10/0.70//000/00       39 SSE   AERO 38 MPH SSE TSTM
4/4  51/38/45/+3/0.01/0/015/02       48 WSW   AERO 48 MPH WSW 
4/5  58/37/48/+5/0/0/551/71          40 W     AERO 37 MPH W
4/6  55/38/47/+4/1.42/0/047/006      42 SE    AER0 40 MPH SE  TSTM 
4/7  50/34/42/-1/T/0/109/14          36 WSW   AERO 35 MPH WSW
4/8  45/32/39/-5/0/0/149/19          33 SW    AERO 31 MPH SW
4/9  60/34/47/+3/0/0/692/88          36 SSW   AERO 33 MPH SSW
4/10 65/41/53/+9/0.18/0/544/69       37 SSW   AERO 35 MPH SSW 
4/11 44/33/39/-6/0.77/0.2/000/00     35 N     AERO 30 N
4/12 43/29/36/-9/0/0/541/68          45 NW    AERO 43 WNW
4/13 52/29/41/-4/0/0/734/92          38 W     AERO 35 W
 
4/14 morning low temp: 37F, our normal low is now 37F
 
NEW DAILY RECORDS FOR APRIL 2009...
 None to date..
 
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