BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA   DAILY DISCUSSION AND CLIMATE SUMMARY SUNDAY, APRIL 7, 2013  ALL TIMES ARE IN EASTERN STANDARD TIME   WARMER TEMPERATURES RETURN TODAY ON INCREASING SOUTH WIND   After a cooler than average day yesterday, warmer temperatures have returned to the summit today, rebounding from a morning low of 31F to the low 50s this afternoon, which is near normal. Altocumulus clouds have been persistent today, allowing only occasional sunshine, which has kept temperatures a bit lower than expected so far, though this could change. Winds have been increasing from the S and SSW today, brining the milder air with them.  The peak gust observed so far today is 43mph. Visibility has been moderate today, up to 65 miles at times, but haze has kept it closer to 50 miles for much of the day.    April has gotten off to a cooler than average start, with the average daily temperature running 1.5F below normal so far.  Warm weather is expected in the next few days which will likely erase this negative departure and begin a positive departure.  We are also running a rainfall departure so far this month with no measurable precipitation recorded since the 1st of the month.  This continues a dry spell that began last month, with less than a half inch of precipitation measured since March 20.       Today's observations:   7 A.M. Weather: Thin broken cirrus, few altocumulus SSW-NNE, haze layer aloft Temperature: 36F; Dew Point: 27F; Wind: S at 12 kts, Sea-level pressure: 30.32 ins. Hg, rising then rising more rapidly Visibility: 45 miles, hazy 6-hour min. temp: 31F BHO SA 1155 250 –BKN 45 269/36/27/1912/032/ FEW AC SSW-NNE HAZY/HZ ALF 8/071 53014 10036 20031   10 A.M. Weather: Broken altocumulus, broken cirrus (partly thin), few altocumulus and altocumulus lenticularis NNW-NNE Temperature: 46F; Dew Point: 20F; Wind: S at 17G24 kts, Wind: Peak gust 32 kts, NW at 9:31 AM Sea-level pressure: 30.27 ins. Hg, rising then falling Visibility: 65 miles, except 55 miles NW, light distant haze BHO SA 1455 E60 BKN 250 BKN 65 250/46/20/1917G24/027/ PK WND 1932/1431 250 LYR PRTLY THN FEW AC/ACSL NNW-NNE LT DSNT HZ VSBY NW 55 8/071 58019   1 P.M. Weather: Broken altocumulus, few cumulus SSE-SSW, few lower altocumulus and altocumulus lenticularis, few cirrus Temperature: 52F; Dew Point: 28F; Wind: S at 25G34 kts, Wind: Peak gust 34 kts, S at 1:49 PM Wind: Direction variable SSE-WSW Sea-level pressure: 30.15 ins. Hg, falling Visibility: 50 miles, distant haze 6-hour max. temp: 52F BHO SA 1755 E95 BKN 210/52/28/1925G34/015/ PK WND 1934/1749 FEW CU SSE-SSW FEW LWR AC/ACSL FEW CI DSNT HZ WND 16V24 8/171 57040 10052 20031   WEATHER SUMMARY FOR SATURDAY, APRIL 6   TEMPERATURE (DEGREES F) MAX.....47     NORMAL.....52 MIN.....30     NORMAL.....34                          MEAN....39     NORMAL.....43     DEPARTURE FROM 30-YEAR NORMAL....................-4 TOTAL DEPARTURE FOR THE MONTH....................-8 [-1.5 DEGREE/DAY]   HEATING DEGREE DAYS  TOTAL HEATING UNITS FOR YESTERDAY............26   DEPARTURE..........+4 TOTAL HEATING UNITS FOR THE MONTH...........146   DEPARTURE..........+8 TOTAL HEATING UNITS FOR THE SEASON.........5166   DEPARTURE........-456 TOTAL HEATING UNITS LAST SEASON TO DATE....4413   DIFFERENCE.......+753   PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY...............38 NW  AT  8:16 A.M.                    AERO....................35 NW  AT  8:16 A.M. *                    ASOS....................39 NW  AT  8:16 A.M.                    DAVIS...................38 NW  AT  8:15 A.M. RMY: 40 THE FASTEST MILE FOR YESTERDAY.............29 NW  AT  8:17 A.M. * MAXIMUM 2-MINUTE ASOS AVERAGE..............29 NW  AT  8:16 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE.............29 NW  AT  8:16 A.M. AVERAGE WIND SPEED AND DIRECTION.........13.5 NW                    ASOS..................12.3                    DAVIS.................12.5 NW [310 deg] * Last of several occurrences   PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE...........-0.17                          ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........0.34  DEPARTURE...........-0.68                          ASOS..............0.35 TOTAL PRECIPITATION FOR THE YEAR..........14.43  DEPARTURE...........-0.59                          ASOS..............N/A* *ASOS malfunctioned during storm on 2/8-9, leading to erroneous totals                         SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M.........0.0   DEPARTURE............-0.2 TOTAL SNOWFALL FOR THE MONTH.............Trace   DEPARTURE............-1.1 TOTAL SNOWFALL FOR THE SEASON.............99.0   DEPARTURE...........+38.2   PRELIMINARY CLIMATE SUMMARY FOR APRIL 2013 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane wind recording system gust RMY:  RMY = R.M. Young wind gust recording system added 8/9/2011 TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized   4/1  61/31/46/+5/0.34/0.0/.../..     40 W   AERO 44 MPH WNW RMY 46 4/2  40/27/34/-7/T/T/.../..          45 W   AERO 42 MPH W   RMY 47 4/3  45/27/36/-6/0.00/0.0/.../..     44 W   AERO 43 MPH W   RMY 47 4/4  55/26/41/-1/0.00/0.0/.../..     30 WSW AERO 27 MPH WSW RMY 31 4/5  59/36/48/+5/0.00/0.0/.../..     33 NNW AERO 28 MPH NNW RMY 38 4/6  47/30/39/-4/0.00/0.0/.../..     38 NW  AERO 35 MPH NW  RMY 40    4/7 morning low temp: 31F; the normal low is now 35F   DAILY RECORDS FOR APRIL 2013 None so far.   DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated):   RECORDS FOR APRIL 7 HIGH 90 IN 2010 LOW 13 IN 1982 PRECIP 1.72 IN. IN 1924 SNOWFALL 4.5 IN. IN 1967, 1996 PEAK GUST 65 MPH WNW IN 1982   RECORDS FOR APRIL 8 HIGH 87 IN 1991 LOW 17 IN 1888 PRECIP 1.78 IN. IN 1956 SNOWFALL 9.3 IN. IN 1956 PEAK GUST 70 MPH S IN 2000   TODAY'S REPORT PREPARED BY: Jonathan O'Brien and Peter Volpe