BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY, JULY 30, 2010 ALL TIMES ARE IN EASTERN STANDARD TIME COOLER AND CALMER TODAY JULY LOOKS TO SET AND EXTEND TEMPERATURE RECORDS Showers yesterday delivered only 0.09 inch of rain. We could use much more than that with our rainfall deficit for July now well over 2 inches. Once again, the high temperature flirted with the 90-degree mark, but fell 2 degrees short yesterday. The temperature today has topped out in the lower 80s through 1PM EST, a few degrees cooler than Thursday. Winds have been markedly calmer as well. As July 2010 comes to a close, we look to easily break not only the warmest July on record, but also the warmest of any month on record! And, if you think 2010 has felt like an unusually warm year so far, you are correct! January to June 2010 will easily set a new record for the warmest such period on record! See stats below. Warmest July Corrected Mean Temperature (deg F) (also warmest for all months of the year) 1) 75.6 in 2010 (through the 29th) 2) 74.9 in 1952 3) 74.1 in 1994 4) 73.8 in 1999 5) 73.5 in 1949 Warmest July Average Maximum Temperature (deg F) 1) 87.2 in 1952 2) 86.9 in 2010 (through the 29th) 3) 85.5 in 1949 4) 84.9 in 1994 5) 84.5 in 1911 Warmest July Average Minimum Temperature (deg F) 1) 66.5 in 2010 (through the 29th) 2) 65.6 in 1994 3) 65.3 in 2006 4) 65.1 in 2008 5) 64.9 in 1999 Warmest Jan-Jul Corrected Mean Temperature (deg F) 1) 50.4 in 2010 (through the 29th) 2) 49.4 in 1991 3) 49.2 in 1949 49.2 in 1998 49.2 in 1999 Greatest monthly number of 90-degree days, July 1) 14 in 1952 2) 10 in 1949 10 in 1963 10 in 2010 (through the 29th) 5) 9 in 1911 6) 8 in 1983 8 in 1988 Greatest monthly number of 90-degree days, all months 1) 14 in July, 1952 2) 13 in August, 2002 3) 10 in August, 1944 10 in July, 1949 10 in July, 1963 10 in July, 2010 (through the 29th) 7) 9 in July, 1911 9 in August, 1928 Today's observations: 7 A.M. Weather: Clear, few altocumulus castellanus distant east thru east-southeast, few altocumulus lenticularus distant northwest, line of cirrus distant east-northeast thru south, few patches dense cirrus, very thin smoke layer along horizon south-southeast thru southwest and west thru northeast Temperature: 66F, Dew point: 52F; Wind: Estimated NW at 2 kts, Wind: Light Sea-level pressure: 29.93 inches Hg, rising Visibility: 75 miles 6-hour minimum temp: 59F 24-hour precip: 0.09 inch BHO SA 1155 CLR 75 135/66/52/E3202/993/ FEW ACC DSNT E-ESE FEW ACSL DSNT NW LINE CI DSNT ENE-S FEW PTCHS DNS CI VRY THN K LYR ALG HRZN SSE-SW AND W-NE WND LGT/ 8/082 51014 MANUAL 70009 ASOS 70009 10066 20059 10 A.M. Weather: Clear, few cumulus forming all quadrants except northeast thru southeast, few cumulus fractus, few cirrus along horizon east-northeast thru southeast, light distant haze Temperature: 74F, Dew point: 48F; Wind: W at 4 kts, Wind: Light and variable Sea-level pressure: 29.92 inches Hg, falling slightly Visibility: 65 miles, light distant haze BHO SA 1455 CLR 65 133/74/48/2804/992/ FEW CU FRMG ALQDS XCPT NE-SE FEW CUFRA FEW CI ALG HRZN ENE-SE LGT DSNT HZ WND LGT AND VRB/ 8/101 1 P.M. Weather: Scattered cumulus, scattered altocumulus formed by spreading out of cumulus, few moderate cumulus, few cumulus fractus, mostly clear sky distant east-northeast thru southeast, light distant haze Temperature: 78F, Dew point: 47F; Wind: WNW at 9 kts, Sea-level pressure: 29.88 inches Hg, falling Visibility: 60 miles, light distant haze 6-hour maximum temp: 80F BHO SA 1755 55 SCT 75 SCT 60 119/78/47/3009/988/ FEW MDT CU FEW CUFRA MSTLY CLR SKY DSNT ENE-SE LGT DSNT HZ/ 8/260 58014 10080 20066 WEATHER SUMMARY FOR THURSDAY, JULY 29 TEMPERATURE (DEGREES F) MAX.....88 NORMAL.....81 MIN.....67 NORMAL.....63 MEAN....78 NORMAL.....72 DEPARTURE FROM 30-YEAR AVERAGE.................+6 TOTAL DEPARTURE FOR THE MONTH................+155 [+5.1 DEGREES/DAY] PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............29 WSW AT 2:12 P.M. * AEROVANE..............30 W AT 3:59 P.M. * ASOS..................30 W AT 2:12 P.M. DAVIS.................31 WSW AT 2:12 P.M. THE FASTEST MILE FOR YESTERDAY...........22 WSW AT 2:13 P.M. * MAXIMUM 2-MINUTE ASOS AVERAGE............22 W AT 4:01 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE.......... 22 SSW AT 2-3:00 A.M. AVERAGE WIND SPEED AND DIRECTION.......13.0 SW ASOS................12.7 DAVIS...............13.1 SW [231 DEG] * last of several occurrences... PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.09 DEPARTURE.........-0.03 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........1.26 DEPARTURE........-2.24 ASOS..............1.22 TOTAL PRECIPITATION FOR THE YEAR..........37.35 DEPARTURE........+8.18 ASOS.............37.04 ** ** ASOS missing rainfall due to system failure on 6/24-25 PRELIMINARY CLIMATE SUMMARY FOR JULY 2010 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane wind recording system gust when significant TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized 7/1 74/53/64/-6/0.00/649/71 30 W AERO 30 MPH W 7/2 80/54/67/-3/0.00/867/95 23 WNW 7/3 85/60/73/+3/0.00/821/90 20 SW 7/4 93/67/80/+10/0.00/492/54 31 W 7/5 94/70/82/+11/0.00/864/97 22 WNW 7/6 99/77/88/+17/0.00/746/82 25 NNW 7/7 91/73/82/+11/0.00/772/85 18 SE 7/8 89/69/79/+8/0.00/835/92 23 S 7/9 90/71/81/+10/0.01/770/85 28 S 7/10 89/68/79/+8/0.01/371/41 30 W TSTM 7/11 86/67/77/+5/T/750/83 20 ENE 7/12 90/68/79/+7/0.00/677/75 32 SSW AERO 33 MPH SSW 7/13 91/71/81/+9/0.05/423/47 25 S 7/14 77/65/71/-1/0.33/000/00 21 NE 7/15 78/64/71/-1/T/449/50 18 ENE 7/16 90/65/78/+6/0.08/629/70 30 W AERO 33 MPH WNW TSTM 7/17 91/71/81/+9/0.00/780/87 25 SW 7/18 90/71/81/+9/0.00/742/83 32 W 7/19 86/69/78/+6/0.04/482/54 30 S AERO 35 MPH S 7/20 80/68/74/+2/0.00/330/37 16 S 7/21 88/68/78/+6/T/382/43 31 S AERO 35 MPH S 7/22 84/66/75/+3/0.00/683/77 32 WNW AERO 37 MPH WNW 7/23 79/65/72/0/0.62/000/00 25 SW 7/24 89/67/78/+5/0.03/362/41 21 WSW TSTM 7/25 89/66/78/+5/T/458/52 30 WNW 7/26 83/60/72/0/0.00/879/100 36 WNW AERO 38 MPH WNW 7/27 89/62/76/+4/0.00/877/100 22 WNW AERO 24 MPH NW 7/28 89/67/78/+6/0.00/.../.. 35 SSW AERO 36 MPH SSW 7/29 88/67/78/+6/0.09/.../.. 29 WSW 7/30 our morning low temp: 59F; the normal low is now 63F NEW DAILY RECORDS FOR JULY 2010 TO DATE: 7/6 - Maximum temperature of 99 degrees F; surpasses 98F set in 1911. 7/6 - Minimum temperature of 77 degrees F; surpasses 73F set in 2003. 7/7 - Minimum temperature of 73 degrees F; surpasses 72F set in 1908. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR JULY 30 HIGH 99F IN 1949 LOW 51F IN 1956 PRECIP 1.84 INCHES IN 1976 PEAK GUST 70e MPH SW 1944 RECORDS FOR JULY 31 HIGH 95F IN 1917 LOW 50F IN 1895,1918 PRECIP 1.34 INCHES IN 1892 PEAK GUST 43e MPH WNW IN 1953, 43 SW IN 1971 TODAY'S REPORT PREPARED BY: Sean Fankhauser