BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, MAY 21, 2014
ALL TIMES ARE IN EASTERN STANDARD TIME
 
BEAUTIFUL SUNNY, WARM DRY DAY
Temperatures have risen to low 70's early this afternoon
with dew points near 50 degrees.  There is a light haze
in the distance limiting visibility to 60 miles. 
 
Today's Observations:
 
7 A.M.
Weather: Thin scattered cirrus, altocumulus, altocumulus 
lenticularis mostly distant to the N-ESE
Temperature: 58F; Dew Point: 49F; Wind: ENE at 8 kts
Sea-level pressure: 30.00 ins. Hg, about steady
Visibility: 50 miles, NE-E 20 miles, NW 60 miles,
thin smoke layer along horizon SSW-W, and along and above
horizon WNW-NNW  
6-hr max temp: 58F
6-hr min temp: 51F
24-hr precip: 0.00
BHO SA 1155 250 –SCT 50 158/58/49/0708/000/ AC/ACSL DSNT N-ESE
VSBY NE-E 20 NW 60 THN SHLW K LYR ALG HRZN SSW-W THN K LYR 
ALG/ABV HRZN WNW-NNW LGT DSNT HZ/ 8/041 50012 10058 20051
 
10 A.M.
Weather: Thin scattered cirrus, cirrostratus, cirrocumulus,
cumulus, few moderate cumulus forming except overhead thru
NE-E, patches of cirrus and cirrocumulus, cirrostratus  
Temperature: 65F; Dew Point: 50F; Wind: E at 5 kts,
Sea-level pressure: 30.00 ins. Hg, steady
Visibility: 60 miles, light distant haze 
BHO SA 1455 250 –SCT 60 159/65/50/0905/000/ CU/FEW MDT CU FRMG 
MSTLY DSNT FRM STN AND XCPT OVHD-NE-E PTCHS CC VC STN LGT DSNT HZ/ 
8/209 50001
 
1 P.M. 
Weather: Scattered cumulus, moderate cumulus, scattered altocumulus
generated by cumulus, cumulus, except overhead thru NE-E, patch
thin cirrus distant NE
Temperature: 70F; Dew Point: 50F; Wind: ENE at 8 kts,
Wind: Direction variable NNE-E
Sea-level pressure: 29.96 ins. Hg, falling then falling more rapidly
Visibility: 60 miles, light distant haze
6-hr max temp: 71F 
6-hr min temp: 58F
BHO SA 1755 50 SCT 70 SCT 250 SCT 60 147/70/50/0708/996/ CU/MDT CU XCPT
OVHD-NE-E FEW ACCG PTCH THN CI DSNT NE WND 02V09/ 8/261 58012 
10071 20058
 
WEATHER SUMMARY FOR TUESDAY, MAY 20, 2014
 
TEMPERATURE (DEGREES F)
MAX.....71    NORMAL.....68
MIN.....48    NORMAL.....49
MEAN....60    NORMAL.....58
 
DEPARTURE FROM 30-YEAR NORMAL..........................+2
TOTAL DEPARTURE FOR THE MONTH.........................+70 [+3.3 DEGREES/DAY]
 
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............5  DEPARTURE..........-3
TOTAL HEATING UNITS FOR THE MONTH.............132  DEPARTURE.........-68     
TOTAL HEATING UNITS FOR THE SEASON...........6303  DEPARTURE.........+68     
TOTAL HEATING UNITS LAST SEASON TO DATE......5672  DIFFERENCE.......+631
 
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY..............0   DEPARTURE..........-1
TOTAL COOLING UNITS FOR THE MONTH.............13   DEPARTURE..........+4
TOTAL COOLING UNITS FOR THE SEASON............13   DEPARTURE..........+2
TOTAL COOLING UNITS LAST SEASON TO DATE........M   DIFFERENCE..........M
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..................25  NNW  AT  9:25 A.M   
                   ASOS.......................28  NNW  AT  9:25 A.M.     
                   DAVIS......................25  WNW  AT  9:12 A.M. RMY 26
FASTEST MILE FOR YESTERDAY....................18  NNW  AT  9:25 A.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE.................18  NNW  AT  9:25 A.M.   
MAXIMUM 2-MINUTE DAVIS AVERAGE................17  NNW  AT  9:25 A.M. 
AVERAGE WIND SPEED AND DIRECTION............. 9.8    
                   ASOS.......................9.8    
                   DAVIS......................8.5 NW [320 deg]
* Last of several occurrences...
 
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 THE MONTH..........2.08  DEPARTURE.............-0.40      
                         ASOS..............2.09
TOTAL PRECIPITATION FOR THE YEAR..........21.20  DEPARTURE.............+0.17
                         ASOS.............21.62
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE...............0.0
TOTAL SNOWFALL FOR THE MONTH................0.0  DEPARTURE...............0.0
TOTAL SNOWFALL FOR THE SEASON..............85.6  DEPARTURE.............+22.9
 
PRELIMINARY CLIMATE SUMMARY FOR MAY 2014 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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
 
5/1  64/43/54/+1/0.49/0.0/093/11          32 SSE RMY 36
5/2  68/51/60/+7/T/0.0/457/54             28 W   RMY 29
5/3  66/48/57/+4/0.00/0.0/332/39          21 SW  RMY N/A 
5/4  60/47/54/0/0.01/0.0/400/47           51 WNW RMY 54
5/5  64/46/55/+1/T/0.0/592/70             30 NW  RMY 32
5/6  63/42/53/-1/T/0.0/506/59             30 NW  RMY 30
5/7  64/42/55/0/0.00/0.0/850/99           21 WNW RMY 23
5/8  69/48/59/+4/0.00/0.0/612/71          17 SSW RMY 19
5/9  57/51/54/-1/0.05/0.0/000/00          21 S   RMY N/A 
5/10 78/57/68/+13/0.10/0.0/043/05         33 S   RMY 37
5/11 79/58/69/+13/0.01/0.0/746/86         30 W   RMY N/A
5/12 85/49/67/+11/0.00/0.0/792/91         39 NE  RMY 42
5/13 54/42/48/-8/0.00/0.0/113/13          32 NE  RMY N/A
5/14 73/42/58/+1/T/ 0.0/613/70            22 S   RMY 24
5/15 77/57/67/+10/T/0.0/140/16            27 S   RMY 33
5/16 73/60/67/+10/..../0.0/.../..         36 S   RMY 41
5/17 74/52/63/+6/..../0.0/.../..          36 SSE RMY N/A
5/18 67/47/57/-1/0.00/0.0/.../..          20 NW  RMY N/A
5/19 65/48/56/-2/..../.../.../..          35 NNW RMY 38
5/20 71/48/60/+2/0.00/0.0/.../..          25 NNW RMY 26
 
5/21  morning low temp: 51F; the normal low is now 49F     
 
DAILY RECORDS FOR MAY 2014
None so far.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):    

RECORDS FOR MAY 21 
HIGH 92F IN 1921
LOW 35F IN 1907
PRECIP 1.61 INS IN 1954
PEAK GUST 74 MPH WSW IN 2006
 
RECORDS FOR MAY 22
HIGH 93F IN 1911
LOW 35F IN 1907
PRECIP 3.75 INCHES IN 1920
PEAK GUST 49e MPH SSW IN 1947
 
TODAY'S REPORT PREPARED BY: Robert Skilling