BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA   DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, APRIL 26, 2007   ALL TIMES ARE IN EASTERN STANDARD TIME   SUNSHINE THRU HIGH CLOUDINESS TODAY   The sunshine today has been slightly dimmed by high cirrus clouds but generally it's back to sunny weather after all the clouds that prevailed yesterday.  Temperatures are running close to normal with a high in the low 60's and low near 40 degrees this morning. Last evening's light rain left 0.23 inch of precipitation.   Today's observations:   7 A.M.   Weather: High thin broken clouds   Temperature: 46F, Dew point: 34F, Wind: NE @ 06 kts  Sea-level pressure: 30.20 ins. Hg, rising Visibility: 20 miles, but 60-70 miles W-NW Remarks: patches dense shallow ground fog dissipating past hour 6-hour min. 39 deg.   24-hour rainfall: 0.23 in.  BHO SA 1155 250 –BKN 300 –OVC 20 228/46/34/0406/020/ BINOVC/ CLR SKY BND XTDNG NW-NE THN FG AND PTCHS DENSE SHLW GF DSSPTNG PST HR VSBY W-NW 60/70 ABV INVSN/ 8/008 53024 MANUAL 70023 ASOS 70022 10046 20039   10 A.M. Weather: Mostly thin broken middle and high clouds  Temperature: 56F, Dew point: 25F, Wind: E @ 07 kts Wind: Variability NNE-SSE  Sea-level pressure: 30.23 inches Hg, rising Visibility: 60 miles   BHO SA 1455 180 SCT 220 SCT 250 –BKN 300 –BKN 60 238/56/25/0807/023/ AC CHAOTIC SKY PTCHS DENSE CI WND 03V15/ 8/092 50010   1 P.M. Weather: High thin overcast  Temperature: 58F, Dew point: 25F, Wind: SSE @ 07G17 kts Sea-level pressure: 30.20 inches Hg, falling Visibility: 60 miles, 70 miles NW  6-hourly max. temp. 60 deg.   BHO SA 1755 150 SCT 220 SCT 250 –BKN 300 –OVC 60 227/58/25/1507G17/020/ FEW CU DSNT SE-SSE ACSL OVHD PTCHS DENSE CI VSBY NW 70/ 8/142 56011 10060 20046    WEATHER SUMMARY FOR WEDNESDAY, APRIL 25   TEMPERATURE (DEGREES F) MAX.....58    NORMAL.....59 MIN.....43    NORMAL.....40 MEAN....51    NORMAL.....50 DEPARTURE FROM 30-YEAR NORMAL...........+1 TOTAL DEPARTURE FOR THE MONTH.........- 59 (-2.6 DEGREES/DAY)   HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY..........14   DEPARTURE.........-1 TOTAL HEATING UNITS FOR THE MONTH.........550   DEPARTURE.......+ 60 TOTAL HEATING UNITS FOR THE SEASON.......5544   DEPARTURE.......-410 TOTAL HEATING UNITS LAST SEASON TO DATE..5334   DIFFERENCE......+210   PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............27  WNW AT 2:41 P.M. *                      AEROVANE.............26  WNW AT 2:36 P.M. *                       ASOS.................25  WNW AT 2:41 P.M.                    DAVIS................27  WNW AT 2:12 P.M.     FASTEST MILE FOR YESTERDAY..............22  WNW AT 2:41 P.M.   MAXIMUM 2-MINUTE ASOS AVERAGE...........21  WNW AT 2:42 P.M.         MAXIMUM 2-MINUTE DAVIS AVERAGE..........22  WNW AT 2:41 P.M.      AVERAGE WIND SPEED AND DIRECTION........5.3  N                      ASOS................5.5                        DAVIS...............4.6 WNW [300] * last of several occurrences...   PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.23  DEPARTURE.....+0.09                          ASOS..............0.22 TOTAL PRECIPITATION FOR THE MONTH..........7.41  DEPARTURE.....+3.75                           ASOS..............7.07    TOTAL PRECIPITATION FOR THE YEAR..........19.15  DEPARTURE.....+1.86                          ASOS.............18.71     SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE......-0.1 TOTAL SNOWFALL FOR THE MONTH................0.2  DEPARTURE......-2.4 TOTAL SNOWFALL FOR THE SEASON..............27.6  DEPARTURE.....-31.9      PRELIMINARY CLIMATE SUMMARY FOR APRIL 2007......CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST   AERO: Aerovane recording wind system when significant TSTM: Thunderstorm day ....: Data not yet available   4/1  59/33/46/+5/0.42/0/511/67       30 S 4/2  39/35/37/-5/0.33/0/000/00       27 E 4/3  41/32/37/-5/0.04/0/000/00       28 ENE 4/4  36/32/34/-8/0.90/0.2/000/00     38 E 4/5  43/26/35/-8/0.21/T/163/21       36 WSW 4/6  39/23/31/-12/0/0/590/76         36 WSW 4/7  40/26/33/-10/0/0/405/52         35 W 4/8  40/25/33/-11/0/0/619/79         44 W      Aero 42 MPH W 4/9  50/30/40/-4/0/0/746/95          36 W 4/10 43/30/37/-7/0/0/158/20          28 W 4/11 51/28/40/-5/0/0/712/90          22 SSE 4/12 39/32/36/-9/0.89/T/000/00       42 E      Aero 40 MPH E 4/13 47/31/39/-6/0/0/096/12          41 W      Aero 42 MPH W 4/14 52/35/44/-2/0/0/392/49          37 W 4/15 44/35/40/-6/1.75/T/000/00       66 E      Aero 64 MPH E  4/16 50/40/45/-1/1.56/0/000/00       73 E      Aero 73 MPH E 4/17 40/35/38/-9/0.69/T/000/00       54 NNE    Aero 53 MPH NNE 4/18 39/36/38/-9/0.37/0/000/00       43 N 4/19 49/36/43/-4/0.02/T/285/35       38 NE     Aero 35 MPH NE 4/20 57/36/47/-1/0/0/815/100         31 N 4/21 74/45/60/+12/0/0/753/92         24 NW 4/22 75/50/63/+14/0/0/779/95         31 SSE     4/23 85/49/67/+18/0/0/675/82         42 S  4/24 73/50/62/+13/0/0/586/71         39 W      Aero  41 MPH W 4/25 58/43/51/+1/0.23/0/083/10       27 WNW   4/26 morning low temp. 39 deg; normal now 40 deg.     NEW DAILY RECORDS FOR APRIL SO FAR....   4/15 - NEW RECORD HIGH PEAK WIND GUST FOR THIS DATE OF 66 MPH E; the previous    record was 59 mph estimated from the S in 1946 and measured from the S in 1980.    NEW RECORD DAILY RAINFALL OF 1.75 INS.; previous record 1.29 ins. in 1990.   4/16 - NEW RECORD HIGH PEAK WIND GUST OF 73 MPH E; the previous record for this   date was 63 mph SSE in 1996.          4/23 - EQUALED RECORD HIGH MAXIMUM TEMPERATURE OF 85 DEGREES set in 1908.   DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated):   RECORDS FOR APRIL 26 HIGH 83 IN 1908 LOW 23 IN 1919 PRECIP 1.64 IN. IN 1931 SNOWFALL 1.0 IN. IN 2000 PEAK GUST 53 MPH SSW IN 1996   RECORDS FOR APRIL 27 HIGH 93 IN 1990 LOW 28 IN 1919 PRECIP 1.89 IN 1979 SNOWFALL 2.7 IN. IN 1993 PEAK GUST 65e MPH N IN 1941   TODAY'S REPORT By: Robert Skilling