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updated July 2004, applying 1971-2000 normals
Latitude: 40.12 N
Longitude: -76.46 W
Elevation: 312 feet
JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC |
YEAR
|
||
Normal Daily Maximum | 37.5 | 40.9 | 50.9 | 62.6 | 72.6 | 80.8 | 85.7 | 83.7 | 75.7 | 64.3 | 52.5 | 41.7 |
62.4
|
|
Normal Daily Minimum | 23.1 | 24.7 | 32.5 | 41.5 | 51.4 | 60.6 | 66.0 | 64.2 | 56.7 | 44.6 | 36.1 | 27.8 |
44.1
|
|
Monthly Mean | 28.6 | 31.3 | 41.2 | 51.6 | 61.8 | 70.9 | 75.7 | 74.1 | 66.4 | 54.7 | 44.4 | 33.6 |
52.9
|
|
Record Highest | 73 | 78 | 87 | 93 | 97 | 100 | 107 | 101 | 102 | 97 | 84 | 75 |
107
|
|
Year | 1950 | 1997 | 1998 | 1985 | 1942 | 1966 | 1966 | 1944 | 1953 | 1941 | 1950 | 1998 |
JUL 1966
|
|
Record Lowest | -22 | -5 | 5 | 19 | 31 | 40 | 49 | 45 | 30 | 23 | 13 | -8 |
-22
|
|
Year | 1994 | 1979 | 1984 | 1982 | 1966 | 1980 | 1945 | 1976 | 1963 | 2000 | 1955 | 1960 |
JAN 1994
|
|
Normal Degree Days (base 65 °F) | Heating | 1076 | 901 | 723 | 390 | 148 | 14 | 0 | 1 | 52 | 338 | 621 | 937 |
5201
|
Cooling | 0 | 0 | 0 | 1 | 54 | 186 | 337 | 279 | 87 | 11 | 0 | 0 |
955
|
|
Percent of Possible Sunshine | 48 | 54 | 57 | 58 | 59 | 64 | 67 | 66 | 61 | 58 | 47 | 44 |
57
|
|
Mean Sky Cover (oktas, sunrise to sunset) | 5.4 | 5.3 | 5.3 | 5.2 | 5.2 | 4.9 | 4.9 | 4.7 | 4.7 | 4.6 | 5.2 | 5.6 |
5.1
|
|
Mean Number of Days | Clear (sunrise to sunset) | 6.5 | 6.6 | 7.1 | 6.5 | 5.9 | 6.4 | 7.0 | 7.7 | 8.5 | 9.8 | 6.3 | 6.1 |
84.4
|
Partly Cloudy (sunrise to sunset) | 7.8 | 7.4 | 8.3 | 8.7 | 10.9 | 11.7 | 11.7 | 11.3 | 9.5 | 8.4 | 8.2 | 7.5 |
111.4
|
|
Cloudy (sunrise to sunset) | 16.7 | 14.3 | 15.4 | 14.9 | 14.3 | 11.9 | 11.9 | 11.6 | 11.6 | 12.4 | 15.2 | 16.8 |
167.0
|
|
Precipitation > 0.01" | 11.4 | 9.8 | 11.1 | 10.2 | 12.1 | 10.1 | 10.9 | 8.4 | 10.1 | 7.3 | 8.3 | 9.5 |
119.2
|
|
Snow or Ice > 1.0" | 3.0 | 4.2 | 2.3 | 0.2 | 0 | 0 | 0 | 0 | 0 | 0 | 0.4 | 2.7 |
12.8
|
|
Thunderstorms | 0.2 | 0.2 | 1.0 | 2.4 | 4.7 | 5.8 | 6.3 | 4.9 | 2.9 | 0.8 | 0.5 | 0.2 |
29.9
|
|
Heavy Fog Visibility < 1/4 mi | 2.3 | 2.4 | 1.9 | 1.0 | 1.0 | 0.6 | 0.6 | 0.8 | 1.5 | 2.7 | 1.8 | 2.5 |
19.1
|
|
Maxima > 90 °F | 0 | 0 | 0 | 0 | 1.9 | 5.2 | 9.1 | 5.1 | 1.1 | 0 | 0 | 0 |
22.4
|
|
Maxima < 32 °F | 8.7 | 5.3 | 1.0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0.1 | 4.6 |
19.7
|
|
Minima < 32 °F | 25.3 | 22.4 | 16.0 | 2.6 | 0 | 0 | 0 | 0 | 0 | 0.6 | 11.8 |
23.0
|
101.7
|
|
Minima < 0 °F | 0.8 | 0.1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
0
|
0.9
| |
Precipitation (inches) | Normal | 3.18 | 2.88 | 3.58 | 3.31 | 4.60 | 3.99 | 3.21 | 3.24 | 3.65 | 3.06 | 3.53 | 3.22 |
41.45
|
Maximum Monthly | 8.01 | 5.93 | 6.32 | 7.96 | 9.71 | 8.12 | 8.09 | 6.26 | 10.50 | 6.37 | 6.23 | 7.57 |
9.71
|
|
Year | 1979 | 1981 | 1993 | 1983 | 1989 | 1982 | 1994 | 1986 | 2004 | 2002 | 1985 | 1983 |
MAY 1989
|
|
Minimum Monthly | 0.43 | 0.39 | 0.95 | 0.45 | 1.39 | 1.00 | 0.97 | 0.53 | 0.65 | 0.47 | 0.92 | 0.31 |
0.31
|
|
Year | 1981 | 2002 | 1995 | 1985 | 1999 | 1988 | 1983 | 1995 | 1986 | 2000 | 1998 | 1998 |
DEC 1998
|
|
Maximum in 24 hours | 2.09 | 1.84 | 2.63 | 2.06 | 2.91 | 2.32 | 3.84 | 2.78 | 3.46 | 2.78 | 3.27 | 2.58 |
3.84
|
|
Year | 1979 | 1985 | 2000 | 1992 | 1984 | 1987 | 1994 | 1991 | 1999 | 1995 | 1993 | 1993 |
JUL 1994
|
|
Snow, Ice Pellets and Hail (inches) | Normal | 9.3 | 8.9 | 6.0 | 0.3 | 0 | 0 | 0 | 0 | 0 | T | 1.7 | 5.9 |
32.1
|
Maximum Monthly | 38.9 | 30.2 | 22.8 | 10.2 | 0 | T | 0 | T | 0 | T | 15.4 | 28.3 |
38.9
|
|
Year | 1996 | 2003 | 1993 | 1982 | - | 1993 | - | 1993 | - | 1982 | 1987 | 1995 |
JAN 1996
|
|
Maximum in 24 hours | 21.7 | 14.2 | 20.4 | 4.0 | 0 | T | 0 | T | 0 | T | 7.9 | 9.1 |
21.7
|
|
Year | 1996 | 1979 | 1993 | 1996 | - | 1993 | - | 1993 | - | 1979 | 1987 | 1990 |
JAN 1996
|
|
Relative Humidity (percent) | 0100 local time | |||||||||||||
0700 local time | ||||||||||||||
1300 local time | ||||||||||||||
1900 local time |
JANUARY | FEBRUARY | MARCH | APRIL | MAY | JUNE | JULY | AUGUST | SEPTEMBER | OCTOBER | NOVEMBER | DECEMBER | |||||||||||||
Day | Rise | Set | Rise | Set | Rise | Set | Rise | Set | Rise | Set | Rise | Set | Rise | Set | Rise | Set | Rise | Set | Rise | Set | Rise | Set | Rise | Set |
h m | h m | h m | h m | h m | h m | h m | h m | h m | h m | h m | h m | h m | h m | h m | h m | h m | h m | h m | h m | h m | h m | h m | h m | |
1 | 730 | 1652 | 717 | 1726 | 642 | 1759 | 552 | 1832 | 508 | 1902 | 440 | 1931 | 441 | 1941 | 505 | 1922 | 535 | 1840 | 603 | 1750 | 637 | 1705 | 711 | 1642 |
2 | 730 | 1653 | 716 | 1727 | 640 | 1800 | 550 | 1833 | 506 | 1903 | 440 | 1932 | 442 | 1941 | 506 | 1921 | 536 | 1838 | 604 | 1749 | 638 | 1704 | 712 | 1642 |
3 | 730 | 1654 | 715 | 1728 | 639 | 1801 | 549 | 1834 | 505 | 1904 | 439 | 1932 | 442 | 1941 | 507 | 1920 | 537 | 1837 | 605 | 1747 | 639 | 1703 | 713 | 1642 |
4 | 730 | 1655 | 714 | 1729 | 637 | 1802 | 547 | 1835 | 504 | 1905 | 439 | 1933 | 443 | 1941 | 508 | 1919 | 537 | 1835 | 606 | 1745 | 640 | 1702 | 713 | 1642 |
5 | 730 | 1655 | 713 | 1731 | 636 | 1803 | 546 | 1836 | 503 | 1906 | 439 | 1934 | 443 | 1940 | 509 | 1918 | 538 | 1833 | 607 | 1744 | 641 | 1700 | 714 | 1641 |
6 | 730 | 1656 | 712 | 1732 | 634 | 1804 | 544 | 1837 | 501 | 1907 | 438 | 1934 | 444 | 1940 | 510 | 1917 | 539 | 1832 | 609 | 1742 | 642 | 1659 | 715 | 1641 |
7 | 730 | 1657 | 711 | 1733 | 632 | 1805 | 542 | 1838 | 500 | 1908 | 438 | 1935 | 445 | 1940 | 511 | 1915 | 540 | 1830 | 610 | 1741 | 644 | 1658 | 716 | 1641 |
8 | 730 | 1658 | 710 | 1734 | 631 | 1806 | 541 | 1839 | 459 | 1909 | 438 | 1935 | 445 | 1940 | 512 | 1914 | 541 | 1829 | 611 | 1739 | 645 | 1657 | 717 | 1641 |
9 | 730 | 1659 | 709 | 1735 | 629 | 1808 | 539 | 1840 | 458 | 1910 | 438 | 1936 | 446 | 1939 | 512 | 1913 | 542 | 1827 | 612 | 1737 | 646 | 1656 | 718 | 1641 |
10 | 730 | 1700 | 707 | 1737 | 628 | 1809 | 538 | 1841 | 457 | 1911 | 438 | 1937 | 447 | 1939 | 513 | 1912 | 543 | 1825 | 613 | 1736 | 647 | 1655 | 719 | 1641 |
11 | 730 | 1701 | 706 | 1738 | 626 | 1810 | 536 | 1842 | 456 | 1912 | 437 | 1937 | 447 | 1938 | 514 | 1910 | 544 | 1824 | 614 | 1734 | 648 | 1654 | 720 | 1642 |
12 | 729 | 1702 | 705 | 1739 | 625 | 1811 | 535 | 1843 | 455 | 1913 | 437 | 1938 | 448 | 1938 | 515 | 1909 | 545 | 1822 | 615 | 1733 | 649 | 1653 | 721 | 1642 |
13 | 729 | 1703 | 704 | 1740 | 623 | 1812 | 533 | 1844 | 454 | 1914 | 437 | 1938 | 449 | 1937 | 516 | 1908 | 546 | 1820 | 616 | 1731 | 651 | 1653 | 721 | 1642 |
14 | 729 | 1705 | 703 | 1741 | 621 | 1813 | 531 | 1845 | 453 | 1915 | 437 | 1938 | 450 | 1937 | 517 | 1906 | 547 | 1819 | 617 | 1730 | 652 | 1652 | 722 | 1642 |
15 | 728 | 1706 | 701 | 1743 | 620 | 1814 | 530 | 1846 | 452 | 1916 | 437 | 1939 | 450 | 1936 | 518 | 1905 | 548 | 1817 | 618 | 1728 | 653 | 1651 | 723 | 1642 |
16 | 728 | 1707 | 700 | 1744 | 618 | 1815 | 528 | 1847 | 451 | 1917 | 437 | 1939 | 451 | 1936 | 519 | 1904 | 549 | 1815 | 619 | 1727 | 654 | 1650 | 723 | 1643 |
17 | 728 | 1708 | 659 | 1745 | 616 | 1816 | 527 | 1848 | 450 | 1918 | 437 | 1940 | 452 | 1935 | 520 | 1902 | 550 | 1814 | 620 | 1725 | 655 | 1649 | 724 | 1643 |
18 | 727 | 1709 | 657 | 1746 | 615 | 1817 | 525 | 1849 | 449 | 1919 | 437 | 1940 | 453 | 1934 | 521 | 1901 | 551 | 1812 | 621 | 1724 | 656 | 1649 | 725 | 1643 |
19 | 727 | 1710 | 656 | 1747 | 613 | 1818 | 524 | 1850 | 448 | 1920 | 438 | 1940 | 453 | 1934 | 522 | 1900 | 552 | 1810 | 622 | 1722 | 658 | 1648 | 725 | 1644 |
20 | 726 | 1711 | 655 | 1749 | 612 | 1819 | 523 | 1851 | 448 | 1921 | 438 | 1940 | 454 | 1933 | 523 | 1858 | 553 | 1809 | 623 | 1721 | 659 | 1647 | 726 | 1644 |
21 | 725 | 1713 | 653 | 1750 | 610 | 1820 | 521 | 1852 | 447 | 1922 | 438 | 1941 | 455 | 1932 | 524 | 1857 | 554 | 1807 | 624 | 1719 | 700 | 1647 | 726 | 1645 |
22 | 725 | 1714 | 652 | 1751 | 608 | 1821 | 520 | 1853 | 446 | 1923 | 438 | 1941 | 456 | 1932 | 525 | 1855 | 555 | 1805 | 625 | 1718 | 701 | 1646 | 727 | 1645 |
23 | 724 | 1715 | 650 | 1752 | 607 | 1822 | 518 | 1854 | 445 | 1924 | 438 | 1941 | 457 | 1931 | 526 | 1854 | 556 | 1804 | 627 | 1717 | 702 | 1645 | 727 | 1646 |
24 | 723 | 1716 | 649 | 1753 | 605 | 1823 | 517 | 1855 | 445 | 1924 | 439 | 1941 | 458 | 1930 | 527 | 1852 | 557 | 1802 | 628 | 1715 | 703 | 1645 | 728 | 1646 |
25 | 723 | 1717 | 648 | 1754 | 603 | 1824 | 515 | 1856 | 444 | 1925 | 439 | 1941 | 459 | 1929 | 528 | 1851 | 558 | 1800 | 629 | 1714 | 704 | 1644 | 728 | 1647 |
26 | 722 | 1718 | 646 | 1755 | 602 | 1825 | 514 | 1857 | 443 | 1926 | 439 | 1941 | 459 | 1928 | 529 | 1849 | 559 | 1759 | 630 | 1713 | 705 | 1644 | 729 | 1647 |
27 | 721 | 1720 | 645 | 1757 | 600 | 1826 | 513 | 1858 | 443 | 1927 | 440 | 1941 | 500 | 1927 | 530 | 1848 | 600 | 1757 | 631 | 1711 | 706 | 1644 | 729 | 1648 |
28 | 720 | 1721 | 643 | 1758 | 559 | 1827 | 511 | 1859 | 442 | 1928 | 440 | 1941 | 501 | 1926 | 531 | 1846 | 601 | 1755 | 632 | 1710 | 707 | 1643 | 729 | 1649 |
29 | 720 | 1722 | 557 | 1829 | 510 | 1900 | 442 | 1929 | 440 | 1941 | 502 | 1925 | 532 | 1845 | 602 | 1754 | 633 | 1709 | 708 | 1643 | 730 | 1649 | ||
30 | 719 | 1723 | 555 | 1830 | 509 | 1901 | 441 | 1929 | 441 | 1941 | 503 | 1924 | 533 | 1843 | 602 | 1752 | 634 | 1708 | 709 | 1642 | 730 | 1650 | ||
31 | 718 | 1724 | 554 | 1831 | 441 | 1930 | 504 | 1923 | 534 | 1841 | 636 | 1706 | 730 | 1651 |