BLUE HILL METEOROLOGICAL OBSERVATORY 
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, APRIL 28, 2015    
ALL TIMES ARE IN EASTERN STANDARD TIME
 
SHOWERS OVERNIGHT BRING 0.25 INCHES OF NEW RAIN,
COOL SPRING CONDITIONS CONTINUE

Light and intermittent rain showers yesterday became
heavier overnight, as 0.25 inches of precipitation was measured
by this morning's 7:00 AM EST observation.

Cloudy conditions have slowly given way to partly to mostly
cloudy skies, as winds from the north have worked to
suppress temperatures. By the 1:00 PM EST observation, a maximum
temperature of 58F had been recorded.

Cool conditions mean another day without this year's first
70 degree day. A significant warm up still does not seem
likely this week, possibly inching 2015 closer to the top
10 latest 70 degree readings.

BHO Latest First 70-deg Temperature, (1885-2014)

1) 20 May, 1966
2) 19 May, 1917
3) 14 May, 1924
4) 11 May, 1975
5) 10 May, 1893
6) 7 May, 1971
7) 5 May, 1939
8) 3 May, 1937
   3 May, 1904
10) 2 May, 1916
    2 May, 1919

  

Today's Observations:

7 A.M.
Weather: Broken stratocumulus, broken altocumulus,
few cumulus fractus distant SW-NW, showers and virga
distant NE-S and NNW
Temperature: 43F; Dew Point: 33F; Wind: N at 13G20 kts,
Peak Wind: 26 kts N @ 6:42 AM EST
Sea-level pressure: 29.75 ins. Hg, increasing, then more quickly
Visibility: 80 miles, except 60 miles NE, showers and virga
6-hr Max temp: 43F
6-hr Min temp: 39F
24-hr precip: 0.25 inches
BHO SA 1155 E30 BKN 50 BKN 80 075/43/33/0113G20/975/ 
VSBY NE 50 MI SHWRS AND VIRGA DSNT NE-S AND NNW 
FEW CUFRA DSNT SW-NW PK WND 3626/42/ 8/830 53020 
ASOS 60003 70024 MANUAL 70025 10043 20039 

10 A.M. 
Weather: Broken stratocumulus, broken altocumulus
Temperature: 49F; Dew Point: 34F; Wind: N at 9G16 kts, 
Sea-level pressure: 29.77 ins. Hg, increasing, then decreasing  
Visibility: 80 miles 
BHO SA 1455 E40 BKN 55 BKN 80 082/49/34/3509G16/977/ 8/530 50007

1 P.M.
Weather: Scattered stratocumulus, scattered cirrus
Temperature: 58F; Dew Point: 31F; Wind: NW at 11G18 kts,
Sea-level pressure: 29.70 ins. Hg, falling, then more quickly
Visibility: 80 miles 
6-hr Max temp: 58F
6-hr Min temp: 42F 
BHO SA 1755 60 SCT 200 SCT 80 059/58/31/3211G18/970/ 
8/501 58023 10058 20042 

SUMMARY FOR MONDAY, APRIL 27, 2015 
  
TEMPERATURE (DEGREES F)
MAX.....56   NORMAL.....60
MIN.....42   NORMAL.....42
MEAN....49   NORMAL.....51

DEPARTURE FROM 30-YEAR NORMAL.......................-2
TOTAL DEPARTURE FOR THE MONTH......................+22 [+0.6 DEGREES/DAY] 
 
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............16  DEPARTURE...........+2
TOTAL HEATING UNITS FOR THE MONTH.............487  DEPARTURE..........-24     
TOTAL HEATING UNITS FOR THE SEASON...........6230  DEPARTURE.........+235
TOTAL HEATING UNITS LAST SEASON TO DATE......6103  DIFFERENCE........+127

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY..................30 NW    AT   3:09 P.M.       
                   ASOS.......................35 NNW   AT   3:10 P.M.       
                   DAVIS......................29 NW    AT   3:45 P.M. RMY N/A 
FASTEST MILE FOR YESTERDAY....................26 NW    AT   3:53 P.M.  
MAXIMUM 2-MINUTE ASOS AVERAGE.................23 NW    AT   3:53 P.M.         
MAXIMUM 2-MINUTE DAVIS AVERAGE................20 NW    AT   3:43 P.M.  
AVERAGE WIND SPEED AND DIRECTION.............12.1 NW
                   ASOS......................11.8     
                   DAVIS.....................10.2 NW [321 degrees] 
* Last of several occurrences...
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.25  DEPARTURE.....+0.12
                         ASOS...............0.24
TOTAL PRECIPITATION FOR THE MONTH...........3.33  DEPARTURE.....-0.82  
                         ASOS...............3.29 
TOTAL PRECIPITATION FOR THE YEAR...........17.92  DEPARTURE.....-0.10
                         ASOS................N/A *** 
*** ASOS annual totals not available due to erroneous readings

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M...........0.0  DEPARTURE......0.0
TOTAL SNOWFALL FOR THE MONTH...............TRACE  DEPARTURE.....-2.9  
TOTAL SNOWFALL FOR THE SEASON..............150.8  DEPARTURE....+88.2 


PRELIMINARY CLIMATE SUMMARY FOR APRIL CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/SUN(MIN.)/SUN(%)/ PEAK GUST/RMY GUST
RMY:  R.M. Young wind gust recording system 
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized

4/1  44/26/35/-6/0.00/0.0/748/98              30 WNW RMY 31 
4/2  59/29/44/+3/T/0.0/375/49                 39 SSW RMY 43 
4/3  56/47/52/+10/0.02/0.0/000/00             36 SW  RMY N/A
4/4  49/32/41/-1/..../0.0/501/65              54 NW  RMY 64
4/5  47/30/39/-4/..../0.0/464/60              40 W   RMY 45
4/6  48/33/41/-2/0/00/0.0/544/70              18 NE  RMY N/A  
4/7  39/34/37/-6/..../0.0/000/00              21 NE  RMY N/A
4/8  41/32/37/-7/..../T/000/00                30 ENE RMY 32
4/9  35/32/34/-10/..../0.0/000/00             31 ENE RMY 32
4/10 53/35/44/-1/..../0.0/000/00              31 SW  RMY N/A
4/11 56/38/46/+1/0.00/0.0/744/94              39 WNW RMY 48
4/12 68/35/52/+7/0.00/0.0/762/96              23 WNW RMY 23  
4/13 69/47/58/+12/0.00/0.0/764/96             35 SSW RMY N/A
4/14 65/51/58/+12/0.05/0.0/072/09             37 SSW RMY N/A
4/15 67/45/56/+9/0.00/0.0/786/98              32 NW  RMY 33
4/16 64/42/53/+6/0.00/0.0/765/95              31 S   RMY 21
4/17 64/45/55/+8/0.05/0.0/065/08              31 SSW RMY 32
4/18 64/43/54/+6/0.00/0.0/770/95              31 N   RMY 36 
4/19 55/39/47/-1/0.00/0.0/724/89              25 NNW RMY N/A
4/20 55/38/47/-2/..../0.0/000/00              36 SE  RMY 40
4/21 67/51/59/+10/..../0.0/417/51             30 SSE RMY N/A
4/22 67/45/56/+7/0.03/0.0/.../..              44 SSW RMY 52
4/23 49/34/42/-8/0.00/0/0/.../..              32 W   RMY N/A 
4/24 50/32/41/-9/0.00/0.0/.../..              32 NW  RMY 36  
4/25 56/30/43/-7/0.00/0.0/.../..              26 NW  RMY 29
4/26 54/39/47/-4/0.00/0.0/.../..              17 NW  RMY N/A
4/27 56/42/49/-2/..../0.0/.../..              30 NW  RMY N/A

4/28  Low since midnight is 39F, normal low is 42F

DAILY RECORDS FOR APRIL 2015

4/3 - NEW RECORD DAILY HIGH MINIMUM TEMPERATURE: 47F
      surpasses the previous record of 46F in 1892

DAILY EXTREMES 
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):  

RECORDS FOR APRIL 28
HIGH 92 IN 1990, 2009
LOW 26 IN 1947
PRECIP 2.41 IN 1904
SNOWFALL 10.0 IN. IN 1987
PEAK GUST 69 MPH NE 1967

RECORDS FOR APRIL 29
HIGH 85 IN 1974
LOW 26 IN 1909
PRECIP 1.65 IN 1923
SNOWFALL 1.0 IN. IN 1987
PEAK GUST 55 MPH WNW IN 2010

TODAY'S REPORT PREPARED BY: Brian Fitzgerald