BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, DECEMBER 25, 2015 CHRISTMAS DAY 
ALL TIMES ARE IN EASTERN STANDARD TIME
 
Today's Observations:
 
7 A.M.
Weather: Scattered altostratus, overcast cirrostratus, altocumulus with
few altocumulus lenticularis and castellanus mostly distant E-S, break in
overcast distant WNW
Temperature: 52F; Dew Point: 49F; Wind: NW @ 12 kts
Sea-level pressure: 30.15 ins. Hg, rising then rising more rapidly
Visibility: 30 miles
6-hr Max temp: 58F
6-hr Min temp: 52F
24-hr precip: Trace 
BHO SA 1155 150 SCT E250 OVC 30 209/52/49/3112/015/ AC/FEW ACSL/ACC
MSTLY DSNT E-S BINOVC DSNT WNW BRGHT ORANGE FULL MOON NR SETTING WNW
PTCHS DNS GF MSTLY VC STN SW-NNW THN DSNT FG/HZ ALQDS HVY CONDENSATION /
8/077 53013 MANUAL 7000/ 10058 20052
 
SUMMARY FOR THURSDAY, DECEMBER 24, 2015
 
TEMPERATURE (DEGREES F)
MAX.....67   NORMAL.....37
MIN.....48   NORMAL.....21
MEAN....58   NORMAL.....29
 
DEPARTURE FROM 30-YEAR NORMAL.....................+29
TOTAL DEPARTURE FOR THE MONTH....................+303  [+12.4 DEGREES/DAY]
 
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............7   DEPARTURE.........-29
TOTAL HEATING UNITS FOR THE MONTH.............476   DEPARTURE........-306
TOTAL HEATING UNITS FOR THE SEASON...........1478   DEPARTURE........-565
TOTAL HEATING UNITS LAST SEASON TO DATE......1859   DIFFERENCE.......-381
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY...................37  SSW AT 11:29 A.M.
                   ASOS........................39  SSW AT 11:29 A.M. 
                   DAVIS.......................35  SW  AT 12-1  P.M. RMY 39
FASTEST MILE FOR YESTERDAY.....................28  SSW AT 11:29 A.M.   
MAXIMUM 2-MINUTE ASOS AVERAGE..................28  SSW AT 11:32 A.M. 
MAXIMUM 2-MINUTE DAVIS AVERAGE.................28  SW  AT 11-12 A.M. 
AVERAGE WIND SPEED AND DIRECTION.............14.4  SW
                   ASOS......................14.2   
                   DAVIS.....................13.1  SW [229 Deg.]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....Trace  DEPARTURE......-0.15
                         ASOS...............0.00
TOTAL PRECIPITATION FOR THE MONTH...........2.80  DEPARTURE......-1.06
                         ASOS...............2.83
TOTAL PRECIPITATION FOR THE YEAR...........42.22  DEPARTURE.....-10.18 
                         ASOS................N/A ***
*** ASOS annual total not available due to erroneous readings
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE......-0.5
TOTAL SNOWFALL FOR THE MONTH................0.0  DEPARTURE......-9.7
TOTAL SNOWFALL FOR THE SEASON.............TRACE  DEPARTURE.....-12.3
 
PRELIMINARY CLIMATE SUMMARY FOR DECEMBER CALENDAR DAY DATA
  DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/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
 
12/1  42/30/36/-1/..../0.0/000/00           19 NNE RMY 19
12/2  53/37/45/+9/..../0.0/000/00           25 SSE RMY 25
12/3  53/37/45/+9/..../0.0/162/29           43 WNW RMY 42
12/4  47/32/40/+5/0.00/0.0/444/80           32 NW  RMY 32
12/5  50/33/42/+7/0.00/0.0/548/99           21 W   RMY N/A
12/6  57/35/46/+11/0.00/0.0/531/96          22 SW  RMY N/A
12/7  54/37/46/+12/0.00/0.0/353/64          31 NE  RMY N/A
12/8  42/35/39/+5/0.01/0.0/000/00           32 NE  RMY 31
12/9  44/34/39/+5/..../0.0/044/08           28 SSE RMY N/A
12/10 57/41/49/+16/T/0.0/209/38             29 SE  RMY N/A
12/11 56/44/50/+17/0.00/0.0/049/09          28 SSW RMY 28
12/12 59/46/53/+20/0.00/0.0/367/67          23 W   RMY N/A
12/13 54/44/49/+17/0.00/0.0/000/00          18 ESE RMY 19
12/14 60/43/52/+20/..../0.0/000/00          32 S   RMY N/A
12/15 61/45/53/+21/..../0.0/371/68          48 W   RMY 51
12/16 45/34/40/+9/0.00/0.0/415/76           25 N   RMY N/A
12/17 53/36/45/+14/..../0.0/000/00          29 SE  RMY 28
12/18 50/35/43/+12/..../0.0/000/00          29 NW  RMY 30
12/19 38/30/34/+4/0.00/0.0/.../..           39 W   RMY 40
12/20 40/28/34/+4/0.00/0.0/.../..           24 W   RMY N/A
12/21 51/31/41/+11/T/0.0/.../..             38 SSW RMY 42
12/22 57/49/53/+24/0.28/0.0/000/00          35 SW  RMY 35
12/23 56/47/52/+23/..../0.0/.../..          30 E   RMY 27
12/24 67/48/58/+29/..../0.0/.../..          37 SSW RMY 39 
 
12/25 low since midnight is 52F; normal low is now 21F 
 
DAILY RECORDS FOR DECEMBER 2015
 
**12/13/2015- NEW DAILY RECORD HIGH MINIMUM TEMPERATURE OF 44F,
BREAKS PREVIOUS RECORD OF 43F SET IN 1919, TIED 1983**
**12/24/2015- NEW DAILY RECORD MAXIMUM TEMPERATURE OF 67F,
BREAKS PREVIOUS RECORD OF 61F SET IN 2014
**12/24/2015- NEW DAILY RECORD HIGH MINIMUM TEMPERATURE OF 48F,
BREAKS PREVIOUS RECORD OF 46F SET IN 1900
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR DECEMBER 25
HIGH 62 IN 1889
LOW -11 IN 1980
PRECIP 1.37 INS. IN 2002
SNOWFALL 8.5 INS. IN 2002
PEAK GUST 80 MPH NW IN 1971
 
RECORDS FOR DECEMBER 26
HIGH 58 IN 1973,1982
LOW -12 IN 1980
PRECIP 3.64 INS. IN 1969
SNOWFALL 17.5 INS. IN 1909
PEAK GUST 84 MPH SSE IN 1957
 
TODAY'S REPORT PREPARED BY: Jonathan O'Brien / Bob Skilling