LOCAL CLIMATOLOGICAL DATA Hourly Summary May 18, 2026 Station: Blue Hill Meteorological Observatory Latitude: 42° 12' 44" N Longitude: 71° 06' 53" W Elevation (ground): 635 ft. Time Zone: Eastern +--+------------------------+----+-----+--------------------+------------------------+------+ | | Temperature | | Pre-| Pressure | Wind |Solar | | +------+------+------+---+ Hu-|cipi-| Adj. to Sea Level +----+---+-------+-------+------+ | | M | M | | |mid-| ta- +------+------+------+ Avg|Res| Peak |2Minute| Mean | | | a | i | | D | ity| tion| | | | | +---+---+---+---+ W | | | x | n | | e | | | | | | S | | S | | S | | a | | H| i | i | M | w | M | | | | M | p | | p | | p | | t | | o| m | m | e | | e |Water| M | M | e | e | D | e | D | e | D | t | | u| u | u | a | P | a | | a | i | a | e | i | e | i | e | i | s | | r| m | m | n | t | n |Equiv| x | n | n | d | r | d | r | d | r | m² | | | | | | | | | | | | | | | | | | | | 1| 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12| 13| 14| 15| 16| 17 | +--+------+------+------+---+----+-----+------+------+------+----+---+---+---+---+---+------+ |00| 70.3 | 69.0 | 69.9 | 53| 55| 0.00| 30.13| 30.11|30.121|12.5| 40| 20| NE| 15| 49| 0 | |01| 69.0 | 66.1 | 67.4 | 51| 56| 0.00| 30.14| 30.13|30.134|13.9| 76| 23|ENE| 17| 78| 0 | |02| 66.1 | 64.1 | 65.3 | 47| 52| 0.00| 30.16| 30.14|30.151|14.6| 83| 24|ENE| 17| 78| 0 | |03| 64.5 | 64.0 | 64.3 | 45| 50| 0.00| 30.18| 30.16|30.169|14.4| 88| 22| E| 17| 82| 0 | | | | | | | | | | | | | | | | | | | |04| 64.5 | 62.7 | 63.5 | 46| 52| 0.00| 30.20| 30.18|30.189|13.5|104| 19| E| 15|109| 9 | |05| 63.1 | 62.4*| 62.7 | 46| 54| 0.00| 30.22| 30.20|30.208|13.1|111| 19| E| 16|108| 43 | |06| 65.4 | 63.0 | 64.0 | 48| 55| 0.00| 30.24| 30.21|30.222|12.1|124| 19|ESE| 15|120| 276 | |07| 69.9 | 65.4 | 67.8 | 48| 50| 0.00| 30.25| 30.23|30.241| 9.9|123| 17|ESE| 14|117| 447 | | | | | | | | | | | | | | | | | | | |08| 73.6 | 69.8 | 71.2 | 49| 45| 0.00| 30.25| 30.23|30.240| 8.6|124| 17|ESE| 13|135| 651 | |09| 76.2 | 73.3 | 74.8 | 50| 42| 0.00| 30.24| 30.23|30.237| 5.6|139| 14| S| 9|177| 770 | |10| 79.2 | 76.0 | 77.9 | 52| 41| 0.00| 30.24| 30.21|30.228| 5.1|149| 14| SE| 8|138| 879 | |11| 81.0 | 78.5 | 79.8 | 53| 39| 0.00| 30.22| 30.19|30.203| 6.9|154| 18| S| 12|158| 880 | | | | | | | | | | | | | | | | | | | |12| 83.0 | 80.6 | 82.0 | 52| 36| 0.00| 30.19| 30.17|30.182| 6.8|175| 18| S| 12|169| 852 | |13| 83.7 | 82.5 | 83.1 | 54| 36| 0.00| 30.17| 30.15|30.163| 8.2|181| 17| S| 12|180| 785 | |14| 83.3 | 82.3 | 82.8 | 55| 39| 0.00| 30.16| 30.14|30.146| 8.5|168| 19| SE| 13|157| 666 | |15| 84.6 | 82.6 | 83.5 | 58| 42| 0.00| 30.14| 30.12|30.128| 9.3|179| 21| SW| 13|175| 534 | | | | | | | | | | | | | | | | | | | |16| 84.8*| 81.5 | 83.6 | 62| 49| 0.00| 30.12| 30.09|30.112|12.7|192| 35| S| 19|186| 360 | |17| 81.5 | 78.0 | 79.8 | 63| 56| 0.00| 30.10| 30.09|30.095|17.3|198| 32| S| 23|196| 158 | |18| 78.0 | 74.0 | 75.9 | 62| 62| 0.00| 30.10| 30.09|30.094|15.7|197| 29| S| 19|205| 22 | |19| 74.1 | 71.9 | 73.0 | 62| 68| 0.00| 30.11| 30.09|30.095|14.9|200| 26| S| 18|202| 0 | | | | | | | | | | | | | | | | | | | |20| 71.9 | 70.5 | 71.0 | 61| 71| 0.00| 30.12| 30.11|30.115|15.2|207| 23| S| 17|208| 0 | |21| 70.6 | 69.5 | 70.1 | 61| 73| 0.00| 30.12| 30.11|30.113|14.2|211| 23| S| 17|208| 0 | |22| 69.5 | 68.5 | 69.0 | 61| 75| 0.00| 30.11| 30.11|30.112|14.9|214| 24|SSW| 17|218| 0 | |23| 68.7 | 68.3 | 68.5 | 61| 77| 0.00| 30.12| 30.10|30.109|15.5|217| 23| SW| 18|220| 0 | +--+------+------+------+---+----+-----+------+------+------+----+---+---+---+---+---+------+ | ---- | ---- | ---- | - | -- |Total| For the day: | ---- | +------+------+------+---+----+-----+------+------+------+----+---+---+---+---+---+------+ | ---- | ---- | ---- | - | -- | 0.00| 30.25| 30.09|30.159|11.8|159| 35| S| 23|196| ---- | +------+------+------+---+----+-----+------+------+------+----+---+---+---+---+---+------+ | Avg | Mean |Avg| Avg|Month| Hour | Hour | ---- | -- | - | Hour | Hour | Avg | +-------------+------+---+----+-----+------+------+------+----+---+-------+-------+------+ | 73.6 | 72.9 | 54|53.2| 0.96| 8 | 19 | ---- | -- | - | 16 | 17 | 305.4| +-------------+------+---+----+-----+------+------+------+----+---+----+--+---+---+------+ | Total Snow, | | | | Heat 0| | Ice Pellets | Greatest Depth on Ground | Precip Types|Degree+----------+ | 0.0 | of Snow, Ice Pellets or Ice 0 | ......... | Days | Cool 9| +--------------------+-----------------------------------+-------------+------+----------+ NOTES: Data in columns 4, 5, 6, 10, 11, 17 are means via continuous observations for each hour. Units: Temperature=°F, Wind=mph, Pressure=Inches Hg, Precipitation=inches. Column 5: Dew point is calculated from temperature and humidity and is continuously averaged for each hour. Column 12: Resultant wind is calculated by the vector sum of continuous wind observations. Precipitation types: 1 FOG, 2 HEAVY FOG, 3 THUNDER, 4 ICE PELLETS, 5 HAIL, 6 GLAZE, 7 DUSTSTORM, 8 SMOKE/HAZE, 9 BLOWING SNOW. Degree Days heating base is 65°F, cooling base is 65°F.