BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, MAY 1, 2013
ALL TIMES ARE IN EASTERN STANDARD TIME
 
A FEW PRELIMINARY APRIL 2013 MONTHLY STATS
Additional stats to come next few days....
 
Temp: Deg. F
Av. Max. 58.1
Av. Min. 38.1
Mean     48.1 [+1.4]
Mean temp. corr. to 24 hours: 47.0
Highest 72 on 9th,19th,24th
Lowest  26 on 4th
Total heating degree day units:       503   [-48 ]
Total heating degree days for season: 5523  [-512 ]
Precipitation in inches
Total for April:        2.29
Departure from normal: -2.26
Snowfall:               trace
Departure from normal: -3.0
Av. wind speed: 13.3 MPH
Av. corrected wind speed: 13.7 MPH
Peak gust registered: 51 MPH S on 7th 
Prevailing direction: S 14%
 
Today's observations:
 
7 A.M.
Weather: Clear, few cirrus mostly distant E-SE 
Temperature: 55F; Dew Point: 26F; Wind: NNE at 2 kts, estimated
Sea-level pressure: 30.33 ins. Hg, rising steadily
Visibility: 50 miles, except 30 miles N-ENE thin smoke layer along the
horizon S-W-N, smoke layer NNE-NE, distant haze, inversion dissipated
6-hour min. temp: 45F
BHO SA 1155 CLR 50 312/55/26/E0202/045/ FEW CI MSTLY DSNT E-SE
VSBY N-ENE 30 THN K LYR ALG HRZN S-W-N AND K LYR NNE-NE 
INVSN DSSPTD DSNT HZ ALQDS WND LGT/ 8/001 51012 10055 20045
 
10 A.M.
Weather: Clear, few small cumulus forming distant SE-S
Temperature: 63F; Dew Point: 22F; Wind: NNE at 7 kts,
Wind: Direction variable NNW-ENE
Sea-level pressure: 30.49 ins. Hg, rising then more slowly   
Visibility: 35 miles, except 50 miles WNW, dark smoke layer
estimated top 15 hundred feet NW and layer extending WNW-N,
both along and above horizon, distant haze all quadrants 
BHO SA 1455 CLR 35 326/62/27/0307/049/ FEW SML CU FRMG DSNT SE-S
DRK K LYR WNW-N ESTMTD MAX TOP 15 HND NW VSBY WNW 50 DSNT HZ ALQDS/
WND 33V07/ 8/100 51014
 
WEATHER SUMMARY FOR TUESDAY, APRIL 30
 
TEMPERATURE (DEGREES F)
MAX.....67     NORMAL.....61
MIN.....47     NORMAL.....43                         
MEAN....57     NORMAL.....52             
 
DEPARTURE FROM 30-YEAR NORMAL....................+5
TOTAL DEPARTURE FOR THE MONTH...................+46 [+1.2 DEGREES/DAY]
 
HEATING DEGREE DAYS 
TOTAL HEATING UNITS FOR YESTERDAY.............8   DEPARTURE..........-5
TOTAL HEATING UNITS FOR THE MONTH...........503   DEPARTURE.........-48
TOTAL HEATING UNITS FOR THE SEASON.........5523   DEPARTURE........-512
TOTAL HEATING UNITS LAST SEASON TO DATE....4714   DIFFERENCE.......+809
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY...............23 ENE AT  2:07 P.M.   
                   AERO....................21 ENE AT  2:07 P.M.   
                   ASOS....................23 ENE AT  2:07 P.M.  
                   DAVIS...................22 ENE AT  2:07 P.M. RMY: 23
THE FASTEST MILE FOR YESTERDAY.............16 ENE AT  2:08 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE..............16 ENE AT  2:08 P.M. 
MAXIMUM 2-MINUTE DAVIS AVERAGE.............16 ENE AT  2:07 P.M.    
AVERAGE WIND SPEED AND DIRECTION..........7.5 S
                   ASOS...................7.3
                   DAVIS..................7.1 SSE [150 deg]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE...........-0.13
                         ASOS..............0.00
TOTAL PRECIPITATION FOR APRIL..............2.29  DEPARTURE...........-2.26
                         ASOS..............2.23
TOTAL PRECIPITATION FOR THE YEAR..........16.38  DEPARTURE...........-2.17
                         ASOS..............N/A*
*ASOS malfunctioned during storm on 2/8-9, leading to erroneous totals
                       
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............-3.0
TOTAL SNOWFALL FOR THE SEASON.............99.0   DEPARTURE...........+36.3
 
PRELIMINARY CLIMATE SUMMARY FOR APRIL 2013 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust
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  61/31/46/+5/0.34/0.0/458/60     40 W   AERO 44 MPH WNW RMY 46  TSTM
4/2  40/27/34/-7/T/T/460/60          45 W   AERO 42 MPH W   RMY 47
4/3  45/27/36/-6/0.00/0.0/755/98     44 W   AERO 43 MPH W   RMY 47
4/4  55/26/41/-1/0.00/0.0/719/93     30 WSW AERO 27 MPH WSW RMY 31
4/5  59/36/48/+5/0.00/0.0/403/52     33 NNW AERO 28 MPH NNW RMY 38
4/6  47/30/39/-4/0.00/0.0/747/96     38 NW  AERO 35 MPH NW  RMY 40 
4/7  52/31/42/-1/0.00/0.0/391/50     51 S   AERO 46 MPH S   RMY 50
4/8  65/43/54/+10/T/0.0/494/63       29 SSW AERO 22 MPH SSW RMY N/A
4/9  72/44/58/+14/T/0.0/456/58       35 WNW AERO 35 MPH WNW RMY 39  TSTM
4/10 64/43/54/+9/0.13/0.0/426/54     23 SE  AERO 20 MPH SE  RMY 25
4/11 52/40/46/+1/0.09/0.0/063/08     18 ENE AERO 14 MPH ENE RMY N/A
4/12 40/34/37/-8/0.58/T/000/00       38 E   AERO 32 MPH E   RMY 41
4/13 52/34/43/-3/0.04/0.0/128/16     31 NNE AERO 27 MPH NNE RMY 21
4/14 52/36/44/-2/0.00/0.0/216/27     31 WNW AERO 27 MPH WNW RMY 32
4/15 55/35/45/-2/0.00/0.0/514/64     21 ESE AERO 15 MPH S   RMY N/A
4/16 62/38/50/+3/T/0.0/540/67        44 S   AERO 40 MPH S   RMY 45
4/17 67/48/58/+11/T/0.0/769/95       29 SSW AERO 25 MPH SSW RMY N/A
4/18 65/43/54/+6/0.00/0.0/503/62     30 S   AERO 25 MPH S   RMY N/A
4/19 72/50/61/+13/0.07/0.0/195/24    47 SSW AERO 48 MPH SSW RMY 50
4/20 62/39/51/+2/0.48/0.0/147/18     43 SSW AERO 41 MPH SSW RMY N/A
4/21 53/31/42/-7/0.00/0.0/819/100    31 WNW AERO 25 MPH WNW RMY N/A
4/22 49/35/42/-7/0.00/0.0/.../..     32 E   AERO 28 MPH E   RMY 33
4/23 40/38/39/-11/0.50/0.0/000/00   35 NNE AERO 30 MPH NNE RMY 35
4/24 72/40/56/+6/0.01/0.0/.../..     36 SSW AERO 33 MPH SSW RMY N/A
4/25 64/44/54/+4/0.05/0.0/.../..     38 W   AERO 32 MPH W   RMY N/A
4/26 58/42/50/-1/0.00/0.0/.../..     28 ENE AERO 22 MPH ENE RMY N/A 
4/27 62/42/52/+1/0.00/0.0/.../..     21 S   AERO 17 MPH S   RMY 22
4/28 69/44/57/+5/0.00/0.0/.../..     25 S   AERO 21 MPH S   RMY 27
4/29 69/46/58/+6/0.00/0.0/.../..     25 S   AERO 30 MPH S   RMY 26
4/30 67/47/57/+5/0.00/0.0/.../..     23 ENE AERO 21 MPH ENE RMY 23
 
5/1  morning low temp: 45F; the normal low is now 43F
 
DAILY RECORDS FOR APRIL 2013
None 
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR MAY 1
HIGH 87F IN 1899
LOW 29F IN 1978
PRECIP 2.53 INCHES IN 1921
SNOWFALL TRACE IN 1905,1917,1921,1995.
PEAK GUST 57 MPH NW IN 1974
 
RECORDS FOR MAY 2
HIGH 92F IN 2001
LOW 29F IN 1903
PRECIP 1.36 INCHES IN 2006
SNOWFALL 1.0 INS IN 1888
PEAK GUST 58 MPH S IN 1983
 
TODAY'S REPORT PREPARED BY: Robert Skilling