BLUE HILL METEOROLOGICAL OBSERVATORY 
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, APRIL 26, 2012
ALL TIMES ARE IN EASTERN STANDARD TIME

TEMPERATURES RISE TO MILD 66F EARLY AFTERNOON AFTER 
A COLD 36F (-6 DEG.) MORNING LOW 

Today's average temperature will most likely be right 
on the normal of 51F with the maximum rising to six 
degrees above NORMAL and minimum falling six degrees 
colder than normal this morning.  

Clouds were on the increase this afternoon after mostly 
clear this morning. Visibility was up to 70 miles 
before decreasing in developing distant haze early 
this afternoon.  

Today's observations:
 
7 A.M.
Weather: Clear, few altocumulus lenticularis WSW, cirrus distant S-SW 
Temperature: 43F, Dew point: 32F, Wind: W at 9 kts
Sea-level pressure: 29.96 inches Hg, rising then more rapidly
Visibility: 60 miles, WNW 70 miles, distant haze, thin smoke
layer along horizon W-N  
24-hour precipitation: Trace
6-hour min. temp: 36F
BHO SA 1155 CLR 60 144/43/32/2709/996/ FEW ACSL WSW CI DSNT S-SW
VSBY NW 70 THN K LYR ALG HRZN W-N DSNT HZ/ 8/041 53017 10043 20036  

10 A.M. 
Weather: Clear, few altocumulus and altocumulus lenticularis distant
S-SW and distant WNW-NW, cirrus distant SSE-W and a patch of cirrus
NNE-ENE  
Temperature: 55F, Dew Point: 29F; Wind: SSW at 5 kts,
Sea-level pressure: 29.93 inches Hg, falling then more slowly  
Visibility: 70 miles, light distant haze   
BHO SA 1455 CLR 70 135/55/29/2005/993/ FEW AC/ACSL DSNT S-SW AND
DSNT WNW-NW CI DSNT SSE-W PTCH CI NNE-ENE/ 8/041 56009 

1 P.M.  
Weather: Scattered altocumulus, broken altocumulus, broken cirrostatus,
altocumulus lenticularis, castellanus all quadrants, altocumulus
invading sky 
Temperature: 65F, Dew Point: 35F; Wind: S at 11 kts, 
Wind: Direction variable SE-SW 
Sea-level pressure: 29.85 inches Hg, falling then more rapidly  
Visibility: 50 miles, W 40, NE-SE 55, distant haze   
6-hour max. temp: 66F
BHO SA 1755 85 SCT E120 BKN 250 BKN 50 108/65/35/1911/985/ FEW SML CU
W AC INVADING ACSL/FEW ACC ALQDS MSTLY CLR SKY CS LYR DSNT SSE-S MSTLY
CLR SKY DSNT NE-E DSNT HZ ALQDS VSBY W 40 NE-SE 55 DSNT HZ WND 14V23/
8/158 58027 10066 20043  

WEATHER SUMMARY FOR WEDNESDAY, APRIL 25

TEMPERATURE (DEGREES F)
MAX.....61    NORMAL.....60
MIN.....41    NORMAL.....41
MEAN....51    NORMAL.....50
 
DEPARTURE FROM 30-YEAR NORMAL.......................+1
TOTAL DEPARTURE FOR THE MONTH.....................+151 [+5.8 DEGREES/DAY]

HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY..............14   DEPARTURE..........-1
TOTAL HEATING UNITS FOR THE MONTH.............341   DEPARTURE........-149
TOTAL HEATING UNITS FOR THE SEASON...........4626   DEPARTURE.......-1328
TOTAL HEATING UNITS LAST SEASON TO DATE......5872   DIFFERENCE......-1246

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............32 W   AT  4:28 P.M. 
                   AERO..................33 W   AT  4:28 P.M.  
                   ASOS..................33 W   AT  4:28 P.M.  
                   DAVIS.................31 W   AT  4:29 P.M. RMY 32
THE FASTEST MILE FOR YESTERDAY...........26 W   AT  4:29 P.M.  
MAXIMUM 2-MINUTE ASOS AVERAGE............24 W   AT  4:30 P.M.   
DAVIS MAXIMUM 2-MINUTE AVERAGE...........23 W   AT  4:30 P.M.  
AVERAGE WIND SPEED AND DIRECTION.......12.3 W  
                   ASOS................11.5
                   DAVIS...............11.2 WSW [240 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....Trace  DEPARTURE..........-0.13 
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........3.50   DEPARTURE..........-0.38
                         ASOS..............3.57
TOTAL PRECIPITATION FOR THE YEAR...........9.59   DEPARTURE..........-8.29
                         ASOS..............9.72
	
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..........-2.6
TOTAL SNOWFALL FOR THE SEASON..............24.2    DEPARTURE.........-35.3

PRELIMINARY CLIMATE SUMMARY FOR APRIL 2012 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
RMY:  RMY = R.M. Young wind gust recording system added 8/9/2011
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
4/1  50/34/42/+1/0.14/0.0/360/47    20 SSW AERO 20 MPH SSW RMY N/A
4/2  51/35/43/+2/0.04/T/353/46      35 NNW AERO 33 MPH NNW RMY 35
4/3  57/31/44/+2/0.00/0.0/724/94    36 NW  AERO 37 MPH NW  RMY 40
4/4  62/38/50/+8/T/0.0/688/89       40 NW  AERO 39 MPH NW  RMY 43
4/5  51/33/42/-1/0.00/0.0/660/85    29 NW  AERO 27 MPH NW  RMY 30
4/6  51/31/41/-2/0.00/0.0/623/80    26 NNW AERO 26 MPH NNW RMY 28
4/7  54/32/43/0/0.00/0.0/305/39     31 NW  AERO 32 MPH NW  RMY 32
4/8  51/37/44/0/0.00/0.0/086/11     32 NW  AERO 31 MPH NW  RMY 33
4/9  57/43/50/+6/T/0.0/323/41       44 W   AERO 42 MPH W   RMY 44
4/10 61/40/51/+6/0.00/0.0/600/76    32 W   AERO 31 MPH W   RMY 34 
4/11 57/40/49/+4/0.00/0.0/397/50    21 NE  AERO 20 MPH NE  RMY 22
4/12 54/39/47/+2/0.16/0.0/127/16    25 NNW AERO 24 MPH NNW RMY 28
4/13 63/36/50/+4/0.00/0.0/782/98    24 W   AERO 23 MPH W   RMY 25
4/14 70/44/57/+11/0.00/0.0/617/77   25 SSW AERO 27 MPH SSW RMY 28
4/15 75/52/64/+17/T/0.0/426/53      23 W   AERO 23 MPH W   RMY 25
4/16 89/57/73/+26/0.01/0.0/678/84   28 SSW AERO 30 MPH SSW RMY 32
4/17 83/53/68/+21/0.00/0.0/777/96   28 W   AERO 28 MPH W   RMY 32 
4/18 61/45/53/+5/0.00/0.0/487/60    27 NNW AERO 27 MPH NNW RMY N/A
4/19 70/44/57/+9/0.00/0.0/676/83    23 S   AERO 22 MPH S   RMY 25
4/20 75/46/61/+12/0.00/0.0/768/94   30 S   AERO 31 MPH S   RMY 33
4/21 75/51/63/+14/T/0.0/508/62      32 S   AERO 37 MPH SSW RMY 38
4/22 59/41/50/+1/1.16/0.0/000/00    50 NE  AERO 51 MPH NE  RMY 52
4/23 61/42/52/+2/1.99/0.0/000/00    46 NE  AERO 47 MPH NE  RMY 48
4/24 57/43/50/0/0.00/0.0/.../..     37 SSW AERO 42 MPH S   MMY N/A 
4/25 61/41/51/+1/T/0.0/.../..       32 W   AERO 33 MPH W   RMY 32  

4/26 the morning low temp: 36F; the normal low is now 42F

DAILY RECORDS FOR APRIL 2012
4/16 - NEW DAILY RECORD HIGH MAXIMUM TEMP OF 89F;
surpasses the previous record of 87F in 1896.
4/23 - NEW DAILY RECORD PRECIPITATION OF 1.99 INCHES;
surpasses the previous record of 1.51 inches in 1998. 

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR APRIL 26
HIGH 88 IN 2009
LOW 23 IN 1919
PRECIP 1.64 IN. IN 1931
SNOWFALL 1.0 IN. IN 2000
PEAK GUST 53 MPH SSW IN 1996

RECORDS FOR APRIL 27
HIGH 93 IN 1990
LOW 28 IN 1919
PRECIP 1.89 IN 1979
SNOWFALL 2.7 IN. IN 1993
PEAK GUST 65e MPH N IN 1941

TODAY'S REPORT PREPARED BY: Robert Skilling

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