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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, APRIL 25, 2018  
ALL TIMES ARE IN EASTERN STANDARD TIME

A FOGGY DAY WITH LIGHT RAIN AND INCREASING WINDS.... 

Light rain started this morning and continued after
the 1:00 P.M. observation. There was a break in the rain
between 9:00 A.M. and 11:00 A.M. So far, we measured 0.20 
inches. Skies remained overcast and fog increased after 
10:00 A.M., bringing the visibility down to three miles
in all directions. Wind increased in the early afternoon, 
and a peak gust of 31 MPH was observed at 12:53 P.M.
The low temperature since midnight was 47F, 6 degrees
above the daily normal of 41F.  

Today's Observations:

7 A.M.
Weather: Light rain, overcast nimbostratus, few stratus 
fractus in all directions
Temperature: 49F; Dew Point: 49F; Wind: SSW at 14G16 kts 
Sea-level pressure: 30.12 ins. Hg, falling steadily     
Visibility: 20 miles, except 5 miles NNE-NNW, distant fog
in all directions
6-hr Max temp: 49F
6-hr Min temp: 47F
24-hr precip: 0.05 ins. 
24-hr snowfall: 0.0 ins.  
Snow depth: 0 ins. 
BHO SA 1155 E80 OVC 20R- 199/49/49/1514G16/012/ VSBY 
NE-NW 20 AND NNE-NNW 5 DSNT FG ALQDS FEW STFA ALQDS/ 
8/72/ 58006 MANUAL 70005 ASOS 70005 10049 20047

10 A.M.
Weather: Overcast nimbostratus, few stratus fractus
in all directions
Temperature: 56F; Dew Point: 54F; Wind: SE at 13G19 kts
Sea-level pressure: 30.05 ins. Hg, falling, then more slowly
Visibility: 30 miles, except 30 miles WSW-NNE, distant fog
in all directions
3-hr precip: 0.06 ins. 
3-hr snowfall: 0.0 ins. 
BHO SA 1455 E30 OVC 30 175/56/54/1413G19/005/ VSBY NE-SW 
40 AND WSW-NNE 30 DSNT FG ALQDS FEW STFA ALQDS/ 8/72/ 57024 
MANUAL 60006 ASOS 60007   

1 P.M.
Weather: Light rain, overcast nimbostratus
Temperature: 55F; Dew Point: 54F; Wind: SE at 16G27 kts,
Peak Wind: 27 kts (31 MPH) S at 12:53 P.M. 
Sea-level pressure: 29.93 ins. Hg, falling, then more slowly 
Visibility: 3 miles 
6-hr Max temp: 58F
6-hr Min temp: 49F
6-hr precip: 0.09 ins. 
6-hr snowfall: 0.00 ins.   
Snow depth: 0 ins.
BHO SA 1755 E15 OVC 3R-F 137/55/54/1416G27/993/ 
PK WND 1427/53/ 8/6// 56038 MANUAL 60009 ASOS 60010 10058 20049       
    
SUMMARY FOR TUESDAY, APRIL 24, 2018

TEMPERATURE (DEGREES F)
MAX.....67   NORMAL.....59
MIN.....39   NORMAL.....41
MEAN....53   NORMAL.....50

DEPARTURE FROM 30-YEAR NORMAL...........................+3
TOTAL DEPARTURE FOR THE MONTH..........................-91 [-3.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY.............12   DEPARTURE..........-3
TOTAL HEATING UNITS FOR THE MONTH............557   DEPARTURE.........+89
TOTAL HEATING UNITS FOR THE SEASON..........5615   DEPARTURE........-337
TOTAL HEATING UNITS LAST SEASON TO DATE.....5283   DIFFERENCE.......+332

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................31 S   AT  2:23 P.M.  
                   AERO........................29 S   AT  2:18 P.M. 
                   ASOS........................33 S   AT  2:23 P.M.
                   DAVIS.......................32 M   AT  2:22 P.M.** RMY 32
FASTEST MILE FOR YESTERDAY.....................22 S   AT  2:26 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE..................23 S   AT  3:12 P.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE.................22 M   AT  2:22 P.M.**
AVERAGE WIND SPEED AND DIRECTION..............13.8 S
                   ASOS.......................14.3
                   DAVIS......................13.8 M **
** Davis direction malfunctioning 

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.05  DEPARTURE......-0.08
                         ASOS..............0.05
TOTAL PRECIPITATION FOR THE MONTH..........4.37  DEPARTURE......+0.61
                         ASOS..............4.53  
TOTAL PRECIPITATION FOR THE YEAR..........23.17  DEPARTURE......+5.59
                         ASOS.............24.77

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE........-0.1
TOTAL SNOWFALL FOR THE MONTH................2.6  DEPARTURE........-0.3
TOTAL SNOWFALL FOR THE SEASON..............92.8  DEPARTURE.......+30.1

PRELIMINARY CLIMATE SUMMARY FOR APRIL CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST
AERO: Aerovane wind recording system 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
M   : Missing data
*   : Estimated data 

4/01 58/33/46/+5/0.00/0.0/336/44   45 SSW AERO 43 SSW RMY N/A  
4/02 38/30/34/-7/0.13/1.6/077/10   20 SSW AERO 15 SSW RMY 17
4/03 48/30/39/-3/..../0.0/238/31   28 SSE AERO 25 SSE RMY 25
4/04 54/36/45/+3/..../0.0/000/00   56 WNW AERO 56 WNW RMY 54
4/05 40/27/34/-9/0.00/0.0/760/98   53 WNW AERO 53 WNW RMY 52 
4/06 41/25/33/-10/0.25/1.0/156/20  37 S   AERO 36 S   RMY 38
4/07 46/32/35/-4/0.00/0.0/312/40   32 WNW AERO 35 WNW RMY 34
4/08 41/29/35/-9/0.00/0.0/290/37   35 WNW*AERO 31 WNW RMY 34
4/09 45/24/35/-9/0.00/0.0/715/01   28 WNW*AERO 25 WNW RMY 29
4/10 39/31/35/-10/T/T/000/00       14 SSW AERO 13 SSW RMY N/A
4/11 48/29/39/-6/T/0.0/364/46      24 SSE AERO 23 SSE RMY 25 
4/12 61/33/47/+2/0.03/0.0/.../..   39 SSW AERO 38 SSW RMY 41 
4/13 65/47/56/+10/T/0.0/.../..     37 SSW AERO 37 SSW RMY N/A
4/14 51/36/44/-2/0.00/0.0/.../..   33 ENE AERO 31 ENE RMY N/A
4/15 36/30/33/-14/..../T/.../..    39 ENE AERO 39 ENE RMY N/A
4/16 55/32/44/-3/..../.../..       41 ENE AERO 43 ENE RMY 41
4/17 48/36/42/-5/0.00/0.0/.../..   37 W   AERO 33 W   RMY 37
4/18 53/32/43/-5/..../0.0/.../..   35 W   AERO 31 W   RMY 34
4/19 41/34/38/-10/0.22/T/.../..    28 WNW AERO 25 WNW RMY N/A 
4/20 52/31/42/-7/0.00/0.0/.../..   34 NW  AERO 33 NW  RMY 36
4/21 60/33/47/-2/0.00/0.0/.../..   28 NW  AERO 26 NW  RMY 29
4/22 61/36/49/0/0.00/0.0/.../..    25 NW  AERO 24 NW  RMY 26 
4/23 62/40/51/+1/0.00/0.0/.../..   25 S   AERO 25 S   RMY 26
4/24 67/39/53/+3/0.00/0.0/.../..   31 S   AERO 29 S   RMY 32

4/25 Low temp since midnight is 47F; normal low is now 41F

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

RECORDS FOR APRIL 25
HIGH 83 IN 2009
LOW 24 IN 1892
PRECIP 1.38 IN. IN 1901
SNOWFALL 0.7 IN. IN 2002.
PEAK GUST 66 MPH SE IN 1968

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

TODAY'S REPORT PREPARED BY: Benjamin Turner