BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, APRIL 18, 2015    
ALL TIMES ARE IN EASTERN STANDARD TIME
 
PERFECTLY CLEAR SKIES GIVE WAY TO SOME CLOUDS WITH WARM
TEMPERATURES
 
Clear skies led to a very quick rise in temperature this morning
with temperatures climbing from the overnight low of 47 to 58
degrees by 8 AM.  Temperatures have reached the lower 60s as some
clouds have begun to move into the region with light winds. 
 
By the 1:00 PM EST observation drier air continued to move ahead of
approaching clouds as the pressure began to fall.  Temperatures fell
since the 10:00 AM EST observation as the winds shifted to the East-
Northeast. 
 
Today's Observations:
 
7 A.M.
Weather:  Clear (SKC)
Temperature: 53F; Dew Point: 43F; Wind: NW at 8 kts,
Sea-level pressure: 29.96 ins. Hg, increasing then more slowly
Visibility: 30 miles, hazy
6-hr Max temp: 58F
6-hr Min temp: 46F
24-hour precip: 0.05 inches
BHO SA 1155 CLR 30 145/53/43/3208/996/ SKC HAZY/ 51010
70005 10058 20046
 
10 A.M.
Weather: Scattered Cumulus
Temperature: 61F; Dew Point: 42F; Wind: NNE at 6 kts,
Wind light and variable
Sea-level pressure: 29.96 ins. Hg, decreasing then increasing
Visibility: 35 miles, hazy
BHO SA 1455 65 SCT 35 146/61/42/0306/996/ HAZY
WND LGT AND VRB/ 8/100 53001
 
1 P.M.
Weather: Few Cumulus
Temperature: 58F; Dew Point: 42F; Wind: ENE at 9 kts
Sea-level pressure: 29.89 ins. Hg, falling then more slowly
Visibility: 35 miles, distant haze
6-hr Max temp: 63F 
6-hr Min temp: 53F
BHO SA 1755 CLR 35 121/58/42/0609/989/ FEW CU ESE-NNW HAZY/
56025 10063 20053 
 
 
SUMMARY FOR FRIDAY, APRIL 17, 2015
 
TEMPERATURE (DEGREES F)
MAX.....64   NORMAL.....56
MIN.....45   NORMAL.....38
MEAN....54   NORMAL.....47
 
DEPARTURE FROM 30-YEAR NORMAL.......................+8
TOTAL DEPARTURE FOR THE MONTH......................+32 [+1.7 DEGREES/DAY]
 
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............10  DEPARTURE...........-8
TOTAL HEATING UNITS FOR THE MONTH.............322  DEPARTURE..........-32    
TOTAL HEATING UNITS FOR THE SEASON...........6065  DEPARTURE.........+227
TOTAL HEATING UNITS LAST SEASON TO DATE......5922  DIFFERENCE........+143
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..................31 SSW   AT   7:59 A.M.   
                   ASOS.......................32 SSW   AT   8:00 A.M.    
                   DAVIS......................31 SSW   AT   4:59 A.M. RMY 32
FASTEST MILE FOR YESTERDAY....................26 SSW   AT   7:58 A.M.  
MAXIMUM 2-MINUTE ASOS AVERAGE.................25 SSW   AT   8:00 A.M.      
MAXIMUM 2-MINUTE DAVIS AVERAGE................24 SSW   AT   8:00 A.M.    
AVERAGE WIND SPEED AND DIRECTION............15.2 W 
                   ASOS.....................15.1   
                   DAVIS....................14.1 SW [232 degrees]
* Last of several occurrences...

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.05  DEPARTURE.....-0.09
                         ASOS...............0.11
TOTAL PRECIPITATION FOR THE MONTH...........1.64  DEPARTURE.....-1.07 
                         ASOS...............1.54
TOTAL PRECIPITATION FOR THE YEAR...........16.23  DEPARTURE.....-0.35
                         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.....-0.1
TOTAL SNOWFALL FOR THE MONTH...............TRACE  DEPARTURE.....-2.4 
TOTAL SNOWFALL FOR THE SEASON..............150.8  DEPARTURE....+88.7
 
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/.../..              39 WNW RMY 48
4/12 68/35/52/+7/0.00/0.0/.../..              23 WNW RMY 23 
4/13 69/47/58/+12/0.00/0.0/.../..             35 SSW RMY N/A
4/14 65/51/58/+12/0.05/0.0/.../..             37 SSW RMY N/A
4/15 67/45/56/+9/0.00/0.0/.../..              32 NW  RMY 33
4/16 64/42/53/+6/0.00/0.0/.../..              31 S   RMY 21
4/17 64/45/55/+8/0.05/0.0/.../..              31 SSW RMY 32
 
4/18 low since midnight is 47F normal low is 39F
 
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 18
HIGH 92 IN 1976
LOW 23 1887
PRECIP 1.48 IN 1954
SNOWFALL 3.7 IN. IN 1965
PEAK GUST 59 MPH S IN 1982
 
RECORDS FOR APRIL 19
HIGH 94 IN 1976 [RECORD FOR MONTH]
LOW 21 IN 1890
PRECIP 1.71 IN 1969
SNOWFALL 6.0 IN. IN 1887
PEAK GUST 66 MPH E IN 1984
 
TODAY'S REPORT PREPARED BY:  Robert Millette/Mike Iacono