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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, FEBRUARY 26, 2018  
ALL TIMES ARE IN EASTERN STANDARD TIME

MORNING FOG QUICKLY DISSIPATES AFTER SUNRISE...

Visibility was variable from a 1/2 mile to 3 miles
at the 7:00 A.M. observation. This was due to 
ground fog in the area which quickly dissipated
shortly after sunrise. Visibility then increased 
throughout the day to 40 miles and then 70 miles by 
1:00 P.M. We also observed dew points and 
humidity decrease throughout the day. With the 
fog we had 100% humidity which dropped to 57% by
1:00 P.M.
Yesterday we observed a mixture of precipitation
which totaled to 0.56 ins. We have been dry so far
today. Temperatures have returned today to above
seasonable with a high of 45F so far today. This is
6 degrees above the normal of 39F.  

Today's Observations:

7 A.M.
Weather: Scattered stratus fractus, broken altocumulus,
broken dense cirrus overhead
Temperature: 35F; Dew Point: 35F; Wind: WNW at 10G14 kts
Sea-level pressure: 30.04 ins. Hg, rising, then more rapidly       
Visibility: 3/4 miles, except 3 miles NNE-ENE
6-hr Max temp: 38F
6-hr Min temp: 35F
24-hr precip:  0.50 ins.
24-hr snowfall: Trace
Snow depth: 0 ins.
BHO SA 1155 E5 BKN 200 BKN 300 BKN 3/4VF 172/35/35/2910G14/004/ 
NEW SNW PST 24 HOURS TRACE DNS CI OVHD VSBY 1/2V1 VSBY NNE-ENE 3 
PTCHS GF BLO SMT ALQDS GF DSPTNG/ 8/712 53010 MANUAL 70050 ASOS 70053 
10038 20035   

10 A.M.
Weather: Broken altocumulus, overcast altostratus
Temperature: 41F; Dew Point: 36F; Wind: WNW at 6G18 kts,
Wind: Light
Sea-level pressure: 30.06 ins. Hg, rising, then more slowly
Visibility: 40 miles, distant haze in all directions 
3-hr precip: 0.00 ins.
3-hr snowfall: 0.0 ins.   
BHO SA 1455 E140 BKN E200 OVC 40 179/41/36/2906G18/006/ 
DST HZ ALQDS WND LGT/ 8/02/ 51007 

1 P.M.
Weather: Broken altocumulus, overcast altostratus
Temperature: 45F; Dew Point: 31F; Wind: WNW at 09G19 kts,  
Sea-level pressure: 30.05 ins. Hg, rising then falling
Visibility: 70 miles   
6-hr Max temp: 45F
6-hr Min temp: 35F
6-hr precip: 0.00 ins. 
6-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1755 E150 BKN E200 OVC 70 176/45/31/2909G19/005/ 
SUN DMLY VSBL/ 8/02/ 58003 10045 20035    
  
SUMMARY FOR SUNDAY, FEBRUARY 25, 2018

TEMPERATURE (DEGREES F)
MAX.....39   NORMAL.....39
MIN.....33   NORMAL.....21
MEAN....36   NORMAL.....30

DEPARTURE FROM 30-YEAR NORMAL............................+6
TOTAL DEPARTURE FOR THE MONTH..........................+196 [+7.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY.............29   DEPARTURE..........-6
TOTAL HEATING UNITS FOR THE MONTH............736   DEPARTURE........-198
TOTAL HEATING UNITS FOR THE SEASON..........4057   DEPARTURE........-407
TOTAL HEATING UNITS LAST SEASON TO DATE.....3805   DIFFERENCE.......+253

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................32 ESE AT  3:03 P.M.* 
                   AERO........................30 ESE AT 11:49 A.M.
                   ASOS........................34 ESE AT 11:50 A.M.
                   DAVIS.......................31 M   AT 11:49 A.M ** RMY 29
FASTEST MILE FOR YESTERDAY.....................25 ESE AT  3:03 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE..................25 ESE AT  3:02 P.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE.................24 M   AT  3:02 P.M.**
AVERAGE WIND SPEED AND DIRECTION..............13.1 ESE 
                   ASOS.......................12.9  
                   DAVIS......................11.7 ** 
*  Last of multiple occurrences
** Davis direction malfunctioning

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.50  DEPARTURE......+0.34
                         ASOS..............0.53
TOTAL PRECIPITATION FOR THE MONTH..........4.11  DEPARTURE......+0.53
                         ASOS..............4.27  
TOTAL PRECIPITATION FOR THE YEAR..........10.11  DEPARTURE......+2.18
                         ASOS.............10.32

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE........-0.5
TOTAL SNOWFALL FOR THE MONTH...............10.2  DEPARTURE........-2.3
TOTAL SNOWFALL FOR THE SEASON..............44.7  DEPARTURE........-1.0

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/..../0.0/120/20      36 SSW AERO 35 SSW RMY N/A 
2/2  34/08/21/-5/..../2.5/223/37       43 WNW AERO 46 WNW RMY 46 
2/3  25/04/15/-11/0.00/0.0/557/92      26 S   AERO 24 S   RMY 30 
2/4  45/23/34/+8/.../T/000/00          31 SSE AERO 29 S   RMY 30
2/5  46/19/33/+7/0.00/0.0/464/76       47 WNW AERO 47 WNW RMY 44
2/6  31/17/24/+2/T/T/025/04            26 SSW AERO 23 SSW RMY 23 
2/7  42/21/32/+5/0.62/1.1/000/00       45 SW  AERO 46 SW  RMY 47
2/8  30/20/25/-2/0.00/0.0/501/81       38 WNW AERO 38 WNW RMY N/A
2/9  30/16/23/-4/0.00/0.0/384/62       28 S   AERO 25 S   RMY N/A
2/10 51/28/40/+13/..../0.0/.../..      31 S   AERO 30 S   RMY 31
2/11 46/36/41/+14/..../0.0/000/00      24 SW  AERO 21 SW  RMY N/A
2/12 53/27/40/+13/..../0.0/.../..      33 WNW AERO 33 WNW RMY N/A
2/13 31/21/26/-2/0.00/0.0/.../..       22 S   AERO 18 WNW RMY 21
2/14 46/25/36/+8/0.00/0.0/.../..       30 S   AERO 26 SSW RMY 29 
2/15 47/35/41/+13/..../0.0/000/00      23 SSW AERO 20 SSW RMY N/A
2/16 50/31/41/+13/..../0.0/.../..      45 W   AERO 44 W   RMY 42
2/17 38/23/31/+3/..../.../.../..       33 SSW AERO 29 SSE RMY 33
2/18 42/29/35/+6/..../.../.../..       32 WNW AERO 29 WNW RMY 34 
2/19 48/30/39/+10/..../0.0/.../..      39 SSW AERO 37 SSW RMY 40       
2/20 68/48/58/+29/..../0.0/.../..      32 SSW AERO 30 SSW RMY N/A
2/21 70/50/60/+31/0.00/0.0/.../..      32 SW  AERO 30 SW  RMY 33
2/22 53/30/42/+13/..../0.8/.../..      30 N   AERO 28 N   RMY N/A 
2/23 41/28/35/+5/0.20/0.0/.../..       34 SW  AERO 20 SW  RMY N/A
2/24 54/35/45/+15/..../.../.../..      32 W   AERO 30 W   RMY 29
2/25 39/33/36/+6/..../.../000/00       33 ESE AERO 30 ESE RMY 33

2/26 Low temp since midnight is 35F; normal low is now 21F

DAILY RECORDS FOR FEBRUARY 2018

2/20/18: NEW DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 68F
         PREVIOUS RECORD WAS 66F SET IN 1930
2/21/18: NEW DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 70F
         PREVIOUS RECORD WAS 62F SET IN 1930
2/21/18: NEW DAILY RECORD HIGH MINIMUM TEMPERATURE OF 50F
         PREVIOUS RECORD WAS 45F SET IN 2002 

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

RECORDS FOR FEBRUARY 26
HIGH 67F IN 1957
LOW -7F IN 1928
PRECIP 2.24 INCHES IN 1979
SNOWFALL 11.1 INCHES IN 1933
PEAK GUST 66 MPH W IN 1961

RECORDS FOR FEBRUARY 27
HIGH 61F IN 1976
LOW -8F IN 1900
PRECIP 1.43 INCHES IN 2013
SNOWFALL 6.0 INCHES IN 1922
PEAK GUST 67 MPH W IN 1985

TODAY'S REPORT PREPARED BY: Kaitlin Geagan and Ben Turner