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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, FEBRUARY 4, 2017  
ALL TIMES ARE IN EASTERN STANDARD TIME

CLEAR AND BLUSTERY DAY

Winds have been consistently coming from the west and peaked
today at 30 MPH during our 1pm ob. Temperatures remained 
below freezing for a second day. Decreasing humidity caused the 
visibility to increase throughout the day, climbing to 80 miles by 
early afternoon.  
 

PRELIMINARY STATS FOR JANUARY 2017
 
TEMPERATURE, Deg. F
Avg. Max. 38.9 [+5.1]
Avg. Min. 26.4 [+9.3]
Mean      32.7 [+7.2]
24-hour corrected mean: 32.7
Max. for month: 59F on 12th
Min. for month:  4F on  9th
 
HEATING DEGREE DAYS
Total heating units: 995 [-231] 
Total for the season: 3027 [-504]
Total for last season: 2742

PRECIPITATION, Inches
Total: 5.50 [+1.15]
Greatest in 24 hrs: 1.87 on the 23-24th

SNOWFALL, Inches
Total: 13.0 [-4.1]
Greatest in 24 hrs: 9.5 in. on 7-8th
 
WIND, mph
Avg. uncorrected wind speed: 13.1
Avg. corrected wind speed: 13.5
Prevailing wind direction: WNW at 13%
Peak gust and direction: 62 NE on 24th
 
SUNSHINE:
Campbell-Stokes card minutes: 6690 mins. of possible 17130 mins. or 39%
Astronomical total minutes: 6909 mins. of possible 17676 mins. or 39%


The 24-hour corrected mean temperature for January of
32.7 deg F is the ninth warmest on record.

BHO Warmest January Corrected Mean Temperatures, deg F (1885-2017)

1) 35.6 in 1913
2) 35.0 in 1932
3) 34.6 in 1937
4) 33.9 in 2006
5) 33.8 in 1933
   33.8 in 1950
   33.8 in 1990
8) 33.5 in 2002
9) 32.7 in 2017
10)32.1 in 1967
   32.1 in 1995   

Today's Observations:

7 A.M.
Weather: Clear, few distant stratocumulus NNE-S, 
few stratocumulus castellanus, few altocumulus
Temperature: 16F; Dew Point: 8F; Wind: W at 9 kts
Sea-level pressure: 30.22 ins. Hg, rising then rising more quickly
Visibility: 50 miles 
6-hr Max temp: 20F
6-hr Min temp: 15F
24-hr precip: 0.0
24-hr snowfall: 0.0
BHO SA 1155 CLR 50 232/16/8/2809/022/ FEW DSNT SC NNE-S FEW 
SCCAS NE-ESE FEW AC NNW-NNE HAZY/ 8/280 53030 10020 20015

10 A.M.
Weather: Few distant cumulus all quadrants  
Temperature: 24F; Dew Point: 11F; Wind: WNW at 10 kts
Sea-level pressure: 30.25 ins. Hg, rising then falling  
Visibility: 75 miles
BHO SA 1455 CLR 75 244/24/11/2910G20/025/ FEW DSNT CU ALQDS/ 8/100 
50012

1 P.M.
Weather: Few distant cumulus SSW-ESE
Temperature: 29F; Dew Point: 8F; Wind: W at 12G26 kts
Sea-level pressure: 30.20 ins. Hg, falling, then more quickly
Visibility: 80 miles
6-hr Max temp: 30F
6-hr Min temp: 16F
BHO SA 1755 CLR 80 230/29/8/2812G26/020/ FEW DSNT CU SSW-ESE 
PK WND 2826/53/ 8/100 58014 10030 20016


SUMMARY FOR FRIDAY, FEBRUARY 3, 2017
 
TEMPERATURE (DEGREES F)
MAX.....30   NORMAL.....35
MIN.....19   NORMAL.....17
MEAN....25   NORMAL.....26

DEPARTURE FROM 30-YEAR NORMAL........................-1
TOTAL DEPARTURE FOR THE MONTH.......................+11 [+3.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............40   DEPARTURE..........+1
TOTAL HEATING UNITS FOR THE MONTH.............106   DEPARTURE.........-12
TOTAL HEATING UNITS FOR THE SEASON...........3133   DEPARTURE........-515
TOTAL HEATING UNITS LAST SEASON TO DATE......2800   DIFFERENCE.......+333

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................28 WNW AT 10:00 P.M.*
                   ASOS........................28 WNW AT  9:59 P.M.
                   DAVIS.......................27 NNW AT  9:58 P.M. RMY 31
FASTEST MILE FOR YESTERDAY.....................21 WNW AT  9:58 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE..................21 WNW AT  9:58 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE.................21 NW  AT  9:58 P.M.
AVERAGE WIND SPEED AND DIRECTION.............11.3 W 
                   ASOS......................10.9
                   DAVIS......................9.7 WNW [298 deg.]
*last of multiple 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..........0.03  DEPARTURE......-0.37
                         ASOS..............0.04
TOTAL PRECIPITATION FOR THE YEAR...........5.53  DEPARTURE......+0.78
                         ASOS..............5.91

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE.......-0.5
TOTAL SNOWFALL FOR THE MONTH................0.4  DEPARTURE.......-1.1
TOTAL SNOWFALL FOR THE SEASON..............21.2  DEPARTURE......-13.4


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

1/1   41/29/35/+8/0.09/0.0/533/97           35 W   AERO 36 W   RMY 34
1/2   38/29/34/+7/0.00/0.0/011/02           21 E   AERO 20 E   RMY N/A  
1/3   42/37/40/+14/1.14/0.0/000/00          39 ENE AERO 41 ENE RMY 34
1/4   44/30/37/+11/0.11/T/000/00            41 WNW AERO 46 WNW RMY 45 
1/5   30/23/27/+1/0.00/0.0/343/62           37 W   AERO 39 W   RMY 38
1/6   30/20/25/-1/0.05/1.7/072/13           20 W   AERO 20 W   RMY N/A
1/7   22/14/18/-8/0.74/9.5/000/00           32 NNW AERO 39 NNW RMY 38
1/8   20/06/13/-13/0.01/T/512/92            26 NNW AERO 29 NNW RMY N/A
1/9   17/04/11/-15/0.00/0.0/335/60          23 SSW AERO 23 SSW RMY 25
1/10  41/14/28/+3/0.18/0.0/369/66           35 SE  AERO 37 SE  RMY N/A
1/11  53/40/47/+22/0.13/0.0/358/64          51 SSW AERO 48 SSW RMY 57
1/12  59/42/51/+26/0.15/0.0/118/21          37 SSW AERO 40 S   RMY 40
1/13  55/23/39/+14/0.00/0.0/535/95          39 WNW AERO 43 WNW RMY 42
1/14  30/14/22/-3/0.00/0.0/339/60           20 SSW AERO 20 SSW RMY 22
1/15  35/23/29/+4/0.00/0.0/555/98           28 NW  AERO 28 NW  RMY 28 
1/16  40/22/31/+6/0.00/0.0/540/95           28 SW  AERO 25 SW  RMY 27
1/17  40/29/35/+10/0.27/T/257/45            23 E   AERO 23 E   RMY 25
1/18  38/31/30/+10/0.29/T/000/00            30 ENE AERO 29 ENE RMY 26
1/19  44/30/37/+12/T/T/379/66               21 NNW AERO 20 NNW RMY 20
1/20  40/30/35/+10/T/0.0/000/00             17 NNW AERO 17 NNW RMY N/A
1/21  54/35/45/+20/T/0.0/133/23             29 W   AERO 29 W   RMY 28
1/22  46/36/41/+16/0.14/T/023/04            31 ENE AERO 30 ENE RMY N/A
1/23  36/33/35/+10/0.48/0.3/000/00          56 NE  AERO 58 NE  RMY N/A
1/24  40/32/36/+11/1.48/0.0/000/00          62 NE  AERO 60 NE  RMY 60
1/25  42/32/37/+12/0.03/0.0/486/83          41 WNW AERO 40 WNW RMY 38
1/26  48/36/42/+17/0.10/0.0/024/04          40 W   AERO 44 W   RMY 41
1/27  42/33/38/+13/T/T/212/36               46 W   AERO 46 W   RMY 50
1/28  38/29/34/+9/0.00/0.0/249/42           36 WNW AERO 40 WNW RMY 43
1/29  39/28/34/+9/0.00/0.0/143/24           29 WSW AERO 29 WSW RMY 32
1/30  34/20/27/+1/0.00/0.0/185/31           30 WNW*AERO 31 WNW RMY 31
1/31  28/15/22/-4/0.11/1.5/198/33           29 WNW AERO 30 WNW RMY N/A

DAILY RECORDS FOR JANUARY 2017

1/12/17: NEW DAILY RECORD HIGH MAXIMUM TEMP. OF 59F,
         PREVIOUS RECORD WAS 57F SET 1913 AND TIED IN 1975
1/12/17: NEW DAILY RECORD HIGH MINIMUM TEMP. OF 42F,
         PREVIOUS RECORD WAS 40F SET 2006

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   40/23/32/+6/0.03/0.4/.../..           43 W   AERO 44 W   RMY 47
2/2   38/25/32/+6/T/T/.../..                36 WNW AERO 37 WNW RMY 36
2/3   30/19/25/-1/0/0/.../..                28 WNW AERO 29 WNW RMY 31

2/4  Low temp since midnight is 15F; normal low is now 17F


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

RECORDS FOR FEBRUARY 4
HIGH 63F IN 1991
LOW -4F IN 1886, 1908
PRECIP 1.80 INS. IN 1926
SNOWFALL 15.0 INS. IN 1961
PEAK GUST 89 MPH SSE IN 1972

RECORDS FOR FEBRUARY 5
HIGH 65F IN 1991
LOW -14F IN 1918
PRECIP 1.55 INS. IN 2001
SNOWFALL 16.0 INS. IN 1907
PEAK GUST 67 MPH WNW IN 1969

TODAY'S REPORT PREPARED BY: Michael Iacono and Kaitlin Geagan