BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SUNDAY, JANUARY 25, 2015 ALL TIMES ARE IN EASTERN STANDARD TIME 5.0 INCHES OF SNOW AND 0.5 INCHES OF GLAZE RECORDED ON TOP OF GREAT BLUE HILL, TEMPS NEVER REACH ABOVE FREEZING ON SATURDAY Snow that began early yesterday morning, transition to freezing rain and drizzle by mid morning, finally ending as fluffy snow by late in the evening. Storm total of 5.0 inches, with significant glaze ice accumulation of 0.5 inches. Today periods of cloud and sun gave way to partly cloudy skies this afternoon. Temperatures which began in the mid 20s have climbed into the mid 30s by the 1 o'clock observation. The humidity has been falling throughout the day from 100% to 64% as of 1 o'clock. Clouds are slowly beginning to build as multiple layers of cloud cover now exist and will continue to build throughout the day as a major storm approaches the area for Monday. Today's Observations: 7 A.M. Weather: Clear, few stratocumulus all quadrants, few cirrus distant NE Temperature: 29F; Dew Point: 27F; Wind: W at 14G20 kts Sea-level pressure: 29.51 ins. Hg, decreasing then increasing Visibility: 35 miles, except 20 Miles SW-WNW 6-hr max temp: 29F 6-hr min temp: 26F 24-hr precip: 0.66 in. 24 hr snowfall: 2.9 ins. Total snow on ground: 5 inches BHO SA 1155 CLR 35 992/29/27/2614G20/951/ VSBY SW-WNW 20 MI FEW SC ALQDS FEW CI DSNT NE NEW SNW PST 24 HRS 2.9 IN STORM TOTAL 5.0 IN GLZ 0.5 IN/ 8/501 53028 ASOS 60067 MANUAL 60066 10029 20026 10 A.M. Weather: Clear, few cumulus fractus SW-NW Temperature: 33F; Dew Point: 30F; Wind: WSW at 11G20 kts Sea-level pressure: 29.59 ins. Hg, increasing then more slowly Visibility: 60 miles 3-hr precip: 0.00 in. 3-hr snowfall 0.0 in. BHO SA 1455 CLR 60 020/33/30/2511G20/959/ FEW CUFRA SW-NW FEW SC ALQDS/ 8/500 51028 1 P.M. Weather: Scattered cumulus, scattered altocumulus, scattered cirrus Temperature: 34F; Dew Point: 23F; Wind: W at 12G21 kts, Sea-level pressure: 29.64 ins. Hg, increasing, then more slowly Visibility: 90 miles 6-hr max. temp: 34F 6-hr min. temp: 28F 6-hr precip: 0.00 6-hr snowfall: 0.0 BHO SA 1755 40 SCT 120 SCT 250 SCT 90 036/34/23/2812G21/964/ PK WND 2726/04/ 8/531 51016 10034 20028 SUMMARY FOR SATURDAY, JANUARY 24, 2015 TEMPERATURE (DEGREES F) MAX.....32 NORMAL.....34 MIN.....27 NORMAL.....17 MEAN....30 NORMAL.....25 DEPARTURE FROM 30-YEAR NORMAL..........................+5 TOTAL DEPARTURE FOR THE MONTH.........................-17 [-0.9 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY..............35 DEPARTURE...........-5 TOTAL HEATING UNITS FOR THE MONTH.............966 DEPARTURE..........+17 TOTAL HEATING UNITS FOR THE SEASON...........3026 DEPARTURE.........-227 TOTAL HEATING UNITS LAST SEASON TO DATE......3215 DIFFERENCE........-189 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY..................24 SSW AT 3:53 A.M. ASOS.......................28 NNW AT 8:55 P.M. DAVIS......................23 SSW AT 3:56 A.M. RMY N/A FASTEST MILE FOR YESTERDAY....................17 SSW AT 3:52 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE.................21 WNW AT 11:05 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE................21 WNW AT 3:56 A.M. AVERAGE WIND SPEED AND DIRECTION............10.8 SSW ASOS.....................13.3 DAVIS....................N/A * last of several occurrences... PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.66 DEPARTURE.....+0.52 ASOS..............0.67 TOTAL PRECIPITATION FOR THE MONTH..........2.60 DEPARTURE.....-0.80 ASOS..............2.67 TOTAL PRECIPITATION FOR THE YEAR...........2.60 DEPARTURE.....-0.80 ASOS..............2.67 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........2.9 DEPARTURE......+2.4 TOTAL SNOWFALL FOR THE MONTH................9.9 DEPARTURE......-3.4 TOTAL SNOWFALL FOR THE SEASON..............20.9 DEPARTURE......-8.4 PRELIMINARY CLIMATE SUMMARY FOR JANUARY CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/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 1/1 31/18/25/-2/0.00/0.0/544/99 29 SSW RMY 30 1/2 37/26/32/+5/0.00/0.0/314/57 35 WSW RMY 38 1/3 34/21/28/+2/0.67/2.5/017/03 25 SE RMY 26 1/4 51/33/42/+16/0.48/0.0/000/00 30 SSW RMY N/A 1/5 46/13/30/+4/0.00/0.0/542/98 48 W RMY 54 1/6 15/10/13/-13/0.02/0.4/000/00 29 W RMY N/A 1/7 22/01/12/-14/0.01/0.3/383/69 43 WNW RMY 47 1/8 16/-5/6/-20/0.00/0.0/539/97 39 WNW RMY N/A 1/9 27/16/22/-4/0.08/0.9/201/36 35 WSW RMY 38 1/10 22/11/17/-8/0.00/0.0/541/97 26 WNW RMY 27 1/11 31/9/20/-5/45/0.00/0.0/123/22 26 SSW RMY N/A 1/12 36/31/34/+9/0.23/T/000/00 29 NNW RMY N/A 1/13 33/11/22/-3/0.00/0.0/524/93 30 NNW RMY 29 1/14 22/11/17/-8/T/T/000/00 18 NNW RMY 16 1/15 27/20/24/-1/0.09/0.8/000/00 20 WSW RMY 22 1/16 35/12/24/-1/T/T/341/60 46 WSW RMY 50 1/17 21/5/13/-12/0.00/0.0/558/98 30 WNW RMY N/A 1/18 50/19/35/+10/0.16/0.0/000/00 47 SE RMY 52 1/19 44/28/36/+11/T/0.0/304/53 33 W RMY 36 1/20 36/23/30/+5/0.00/0.0/495/86 28 W RMY 28 1/21 30/17/24/-1/0.00/0.0/358/62 21 WNW RMY N/A 1/22 36/25/31/+6/T/T/.../.. 20 WNW RMY 20 1/23 36/18/27/+2/0.00/0.0/.../.. 25 SSW RMY 26 1/24 32/27/30/+5/0.84/5.0/000/00 24 SSW RMY N/A 1/25 morning low temp: 26F since midnight; normal low is now 17F DAILY RECORDS FOR JANUARY 2015 None so far. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR JANUARY 25 HIGH 56F IN 2010 LOW -10F IN 1935 PRECIP 2.24 INS. IN 1979 SNOWFALL 12.5 INS. IN 1941 PEAK GUST 81 MPH WNW IN 1972 RECORDS FOR JANUARY 26 HIGH 68F IN 1950 [RECORD FOR MONTH] LOW -5F IN 1920 PRECIP 1.60 INS. IN 1958 SNOW 9.0 INS. IN 1898 WIND 90e MPH SE IN 1978 TODAY'S REPORT PREPARED BY: Brian Fitzgerald