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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, FEBRUARY 7, 2018  
ALL TIMES ARE IN EASTERN STANDARD TIME

LIGHT SNOW TURNS TO RAIN MID-AFTERNOON...

Light snow began today around 10:40 A.M.
The snow continued until just before 2:00 P.M. 
and then switched over to rain. We measured
1.1 inches of snow at 1:00 P.M. Temperatures
today and yesterday have been close to normal 
with a high of 31F, the daily normal is 35F. 
Winds have been light to moderate today and
shifted from the WNW to the ESE late this
morning. The pressure has been falling 
throughout the day and was rapidly falling
this afternoon.

PRELIMINARY STATS FOR JANUARY 2018
 
TEMPERATURE, Deg. F
Avg. Max. 33.8  [0.0]
Avg. Min. 18.3 [+1.2]
Mean      26.1 [+0.6]
24-hour corrected mean: 26.4
Max. for month: 60F on 12th and 13th
Min. for month: -8F on  7th
 
HEATING DEGREE DAYS
Total heating units:  1199  [-27] 
Total for the season: 3321 [-210]
Total for last season: 3027

PRECIPITATION, Inches
Total: 6.00 [+1.65]
Greatest in 24 hrs: 2.28 on the 12-13th

SNOWFALL, Inches
Total: 25.2 [+8.0]
Greatest in 24 hrs: 16.5 in. on 4th
 
WIND, mph
Avg. uncorrected wind speed: 14.7
Avg. corrected wind speed: 15.0
Prevailing wind direction: W at 16%
Peak gust and direction: 58 SSW on 13th
 
SUNSHINE:
Campbell-Stokes card minutes: 8274 minutes of possible 17130 or 48%
Astronomical total minutes:   8550 minutes of possible 17666 or 48%


Today's Observations:

7 A.M.
Weather: Broken altocumulus and broken altostratus
thin smoke layer SSW-NNE  
Temperature: 23F; Dew Point: 15F; Wind: NNE at 9 kts
Sea-level pressure: 30.50 ins. Hg, falling unsteadily   
Visibility: 50 miles 
6-hr Max temp: 24F
6-hr Min temp: 21F
24-hr precip: Trace
24-hr snowfall: Trace 
Snow depth: 0 ins.
BHO SA 1155 E150 BKN 200 BKN 50 327/23/15/0309/050/ 
NEW SNW PST 24 HRS TRACE FEW DSNT AC NNE-SSW THN K 
LYR SSW-NNE/ 8/090 57013 10024 20021    

10 A.M.
Weather: Broken stratocumulus, overcast altostratus 
Temperature: 25F; Dew Point: 7F; Wind: SSW at 8 kts
Sea-level pressure: 30.42 ins. Hg, falling, then more rapidly 
Visibility: 40 miles, distant fog in all directions  
3-hr precip: 0.00 ins.
3-hr snowfall: 0.0 ins.  
BHO SA 1455 E30 BKN E100 OVC 40 303/28/19/1104/042/ 
THN K LYR SSW-ENE DSNT FG ALQDS/ 8/52/ 58024  
 
1 P.M.
Weather: Light snow and fog, overcast nimbostratus 
Temperature: 30F; Dew Point: 29F; Wind: ESE at 11G18 kts
Sea-level pressure: 30.20 ins. Hg, falling, then more rapidly
Visibility: Variable 1/2 to 1 mile
6-hr Max temp: 30F
6-hr Min temp: 23F
6-hr precip: 0.11 ins.
6-hr snowfall: 1.1 ins.
Snow depth: 1 in.
BHO SA 1755 E15 OVC 1/2V1S-F 226/30/29/1211G18/020/ NEW 
SNW PST 6 HRS 1.1 INS PRESFR/ 8/6// 4/001 58077 MANUAL 
6011/ ASOS 60011 10030 20023

SUMMARY FOR TUESDAY, FEBRUARY 6, 2018

TEMPERATURE (DEGREES F)
MAX.....31   NORMAL.....35
MIN.....17   NORMAL.....18
MEAN....24   NORMAL.....26

DEPARTURE FROM 30-YEAR NORMAL.............................-2
TOTAL DEPARTURE FOR THE MONTH.............................+7 [+1.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY.............41   DEPARTURE..........+2
TOTAL HEATING UNITS FOR THE MONTH............227   DEPARTURE..........-7
TOTAL HEATING UNITS FOR THE SEASON..........3548   DEPARTURE........-217
TOTAL HEATING UNITS LAST SEASON TO DATE.....3238   DIFFERENCE.......+310

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................26 SSW AT 12:46 P.M. 
                   AERO.........................23 SSW AT 12:45 P.M.
                   ASOS.........................24 SW  AT 12:45 P.M.
                   DAVIS........................22 M   AT 12:44 P.M.** RMY 23 
FASTEST MILE FOR YESTERDAY......................17 SSW AT 12:45 P.M.   
MAXIMUM 2-MINUTE ASOS AVERAGE...................20 SW  AT 12:46 P.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE..................18 M   AT 12:46 P.M.**
AVERAGE WIND SPEED AND DIRECTION...............7.9 WNW
                   ASOS........................8.2 
                   DAVIS.......................7.2 ** 
* Last of several occurrences
** Davis direction malfunctioning

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..........0.99  DEPARTURE......+0.18
                         ASOS..............1.05  
TOTAL PRECIPITATION FOR THE YEAR...........6.99  DEPARTURE......+1.83
                         ASOS..............7.63

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE........-0.5
TOTAL SNOWFALL FOR THE MONTH................2.5  DEPARTURE........-0.5
TOTAL SNOWFALL FOR THE SEASON..............37.0  DEPARTURE........+0.8

PRELIMINARY CLIMATE SUMMARY FOR JANUARY 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

1/01 11/-5/3/-24/0.00/0.0/538/98        30 NW  AERO 30 NW  RMY 31
1/02 15/-2/7/-20/0.00/0.0/402/73        26 W   AERO 25 W   RMY 26  
1/03 28/11/20/-6/0.00/0.0/430/78        23 WSW AERO 20 WSW RMY N/A
1/04 28/18/23/-3/1.66/16.5/000/00       54 NNW AERO 60 NNW RMY 64
1/05 18/2/10/-16/0.00/0.0/431/78        53 W   AERO 53 W   RMY 57
1/06 10/-2/4/-22/0.00/0.0/554/100       43 WSW AERO 47 WSW RMY 47
1/07 14/-8/3/-23/0.00/0.0/549/99        37 WNW AERO 35 WNW RMY N/A 
1/08 33/14/24/-2/0.02/T/006/01          40 S   AERO 40 S   RMY 42 
1/09 40/25/33/+7/T/T/356/64             37 W   AERO 35 W   RMY 33
1/10 36/20/28/+3/0.00/0.0/553/99        30 W   AERO 30 W   RMY N/A
1/11 50/32/41/+16/0.00/0.0/056/10       33 S   AERO 32 S   RMY 34
1/12 60/45/53/+28/0.89/0.0/011/02       56 S   AERO 56 S   RMY 55
1/13 60/17/39/+14/1.39/0.0/265/47       58 SSW AERO 60 SSW RMY 62
1/14 21/11/16/-9/0.00/0.0/350/62        30 NW  AERO 30 NW  RMY N/A
1/15 18/11/15/-10/0.02/0.5/000/00       23 NNW AERO 21 N   RMY 23
1/16 31/18/25/0/0.00/0.0/153/27         17 SSE AERO 15 SSE RMY N/A 
1/17 32/29/31/+6/0.21/2.3/000/00        20 SE  AERO 17 SE  RMY N/A
1/18 29/16/23/-2/0.00/0.0/497/87        24 NW  AERO 23 NW  RMY 26 
1/19 34/17/26/+1/0.00/0.0/229/40        22 SSW AERO 20 SSW RMY N/A
1/20 45/27/36/+11/0.00/0.0/161/28       38 WSW AERO 37 WSW RMY 39 
1/21 47/34/41/+16/0.00/0.0/467/81       22 W   AERO 21 W   RMY N/A
1/22 37/34/36/+11/0.10/0.0/000/00       21 E   AERO 16 E   RMY N/A
1/23 55/33/44/+19/1.23/0.0/000/00       53 S   AERO 58 S   RMY 57 
1/24 37/22/30/+5/0.00/0.0/455/78        36 WNW AERO 35 WNW RMY 36 
1/25 29/17/23/-2/0.00/0.0/556/95        35 WNW AERO 36 WNW RMY 41 
1/26 32/15/24-1/0.00/0.0/581/99         28 WNW AERO 28 WNW RMY N/A
1/27 52/24/38/+13/0.00/0.0/406/69       43 SSW AERO 44 SSW RMY N/A
1/28 50/39/45/+20/0.06/0.0/000/00       35 SSW AERO 37 SSW RMY N/A
1/29 39/25/32/+7/0.03/0.3/000/00        37 NNE AERO 32 NNE RMY 35 
1/30 27/17/22/-4/0.39/5.6/000/00        35 NW  AERO 35 NW  RMY 38  
1/31 29/12/21/-5/0.00/0.0/544/91        36 S   AERO 32 S   RMY 35 

DAILY RECORDS FOR JANUARY 2018

01/04/18: NEW DAILY RECORD MAXIMUM SNOWFALL OF 16.5 INS. 
          PREVIOUS RECORD WAS 8.6 INS. SET IN 1923 AND 
          TIED IN 1942 

01/07/18: NEW DAILY RECORD LOW MINIMUM TEMPERATURE OF 
          -8F, PREVIOUS RECORD OF -7F WAS SET IN 1896

01/12/18: NEW DAILY RECORD HIGH MINIMUM TEMPERATURE OF 
          45F, PREVIOUS RECORD OF 42F WAS SET IN 2017

          NEW DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 
          60F, PREVIOUS RECORD OF 59F WAS SET IN 2017

01/13/18: NEW DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 
          60F, PREVIOUS RECORD OF 57F WAS SET IN 1890 
          AND TIED IN 1932 

01/28/18: TIED DAILY RECORD HIGH MINIMUM TEMPERATURE OF 
          39F, PREVIOUS RECORD OF 39F WAS SET IN 1974

PRELIMINARY CLIMATE SUMMARY FOR FEBRUARY 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

2/1 45/27/36/+10/..../0.0/.../..      36 SSW AERO 35 SSW RMY N/A 
2/2 34/08/21/-5/..../.../.../..       43 WNW AERO 46 WNW RMY 46 
2/3 25/04/15/-11/0.00/0.0/.../..      26 S   AERO 24 S   RMY 30 
2/4 45/23/34/+8/.../T/.../..          31 SSE AERO 29 S   RMY 30
2/5 46/19/33/+7/0.00/0.0/.../..       47 WNW AERO 47 WNW RMY 44
2/6 31/17/24/+2/T/T/.../..            26 SSW AERO 23 SSW RMY 23 

2/7 Low temp since midnight is 21F; normal low is now 18F

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

RECORDS FOR FEBRUARY 7
HIGH 51F IN 1951,1953
LOW -8F IN 1910
PRECIP 2.12 INS. IN 1983
SNOWFALL 17.1 INS. IN 1978 [BLIZZARD OF 1978]
PEAK GUST 87e MPH SSE IN 1951

RECORDS FOR FEBRUARY 8
HIGH 60F IN 1933
LOW -9F IN 1934
PRECIP 2.50 INS. IN 1945
SNOWFALL 16.1 INS. IN 2013
PEAK GUST 63e MPH NE IN 1945, 2013

TODAY'S REPORT PREPARED BY: Kaitlin Geagan