Cumulonimbus Average Base Height (meters) March, April, May (1971 - 1996) Night, Land Areas Only Global Average: 774 Zonal Averages 28 zones Lat.N Average 82.5 585 77.5 528 72.5 535 67.5 708 62.5 804 57.5 808 52.5 669 47.5 898 42.5 1078 37.5 1121 32.5 1202 27.5 975 22.5 953 17.5 783 12.5 939 7.5 748 2.5 668 -2.5 626 -7.5 613 -12.5 917 -17.5 916 -22.5 1065 -27.5 1297 -32.5 1021 -37.5 1039 -42.5 957 -47.5 686 -52.5 579 Grid Box Averages 609 boxes filled with min 30 obs. Box # Lat.N Lon.E Average N.Obs. 2 82.5 20.0 636 44 3 82.5 60.0 571 217 11 77.5 10.0 566 1693 12 77.5 30.0 400 518 14 77.5 70.0 483 581 15 77.5 90.0 587 318 16 77.5 110.0 542 479 29 72.5 10.0 589 2229 30 72.5 30.0 540 11210 31 72.5 50.0 480 1447 32 72.5 70.0 513 762 33 72.5 90.0 479 574 34 72.5 110.0 622 857 35 72.5 130.0 622 652 36 72.5 150.0 657 130 37 72.5 170.0 600 53 38 72.5 -170.0 521 43 46 72.5 -10.0 383 868 48 67.5 15.0 664 17000 49 67.5 25.0 767 6336 50 67.5 35.0 591 34699 51 67.5 45.0 523 8948 52 67.5 55.0 597 8517 53 67.5 65.0 503 6963 54 67.5 75.0 527 2171 55 67.5 85.0 636 4951 56 67.5 95.0 951 2214 57 67.5 105.0 894 751 58 67.5 115.0 818 589 59 67.5 125.0 756 1035 60 67.5 135.0 973 979 61 67.5 145.0 953 90 62 67.5 155.0 846 763 63 67.5 165.0 864 388 64 67.5 175.0 727 241 65 67.5 -175.0 657 450 66 67.5 -165.0 451 223 77 67.5 -55.0 1207 126 80 67.5 -25.0 559 1313 81 67.5 -15.0 817 1799 83 62.5 5.0 656 11140 84 62.5 15.0 732 11137 85 62.5 25.0 846 5714 86 62.5 35.0 626 11221 87 62.5 45.0 621 10769 88 62.5 55.0 666 8302 89 62.5 65.0 750 5798 90 62.5 75.0 676 4390 91 62.5 85.0 775 4979 92 62.5 95.0 862 8918 93 62.5 105.0 840 5126 94 62.5 115.0 856 4554 95 62.5 125.0 924 4409 96 62.5 135.0 988 3562 97 62.5 145.0 1215 2820 98 62.5 155.0 1027 2096 99 62.5 165.0 675 5523 100 62.5 175.0 627 1143 101 62.5 -175.0 565 418 103 62.5 -155.0 1400 63 104 62.5 -145.0 1429 56 106 62.5 -125.0 1479 34 107 62.5 -115.0 1314 42 113 62.5 -55.0 569 44 114 62.5 -45.0 696 37 116 62.5 -25.0 502 1487 117 62.5 -15.0 642 93 118 62.5 -5.0 436 3321 119 57.5 5.0 712 6300 120 57.5 15.0 696 9924 121 57.5 25.0 634 10412 122 57.5 35.0 701 8680 123 57.5 45.0 727 6516 124 57.5 55.0 782 10810 125 57.5 65.0 750 8246 126 57.5 75.0 715 9036 127 57.5 85.0 692 21860 128 57.5 95.0 820 21158 129 57.5 105.0 918 17232 130 57.5 115.0 1178 12835 131 57.5 125.0 788 6199 132 57.5 135.0 876 2863 133 57.5 145.0 809 1859 134 57.5 155.0 614 5814 135 57.5 165.0 589 5524 142 57.5 -125.0 1215 36 143 57.5 -115.0 1297 43 154 57.5 -5.0 510 6225 155 52.5 5.0 642 7551 156 52.5 15.0 764 17885 157 52.5 25.0 759 12679 158 52.5 35.0 764 10411 159 52.5 45.0 738 4974 160 52.5 55.0 864 5933 161 52.5 65.0 833 5430 162 52.5 75.0 784 8856 163 52.5 85.0 864 23431 164 52.5 95.0 1021 20609 165 52.5 105.0 980 29535 166 52.5 115.0 1078 19520 167 52.5 125.0 915 8505 168 52.5 135.0 877 17139 169 52.5 145.0 655 12999 170 52.5 155.0 649 8465 173 52.5 -175.0 726 34 177 52.5 -135.0 603 508 178 52.5 -125.0 732 421 179 52.5 -115.0 1150 89 180 52.5 -105.0 1499 167 181 52.5 -95.0 1240 53 189 52.5 -15.0 745 355 190 52.5 -5.0 584 6868 191 47.5 2.5 787 779 192 47.5 7.5 785 4736 193 47.5 12.5 934 5056 194 47.5 17.5 1000 4492 195 47.5 22.5 907 17146 196 47.5 27.5 803 11945 197 47.5 32.5 795 8437 198 47.5 37.5 797 8546 199 47.5 42.5 712 6703 200 47.5 47.5 854 925 201 47.5 52.5 852 647 202 47.5 57.5 865 2127 203 47.5 62.5 886 1641 204 47.5 67.5 859 1631 205 47.5 72.5 839 2334 206 47.5 77.5 914 2038 207 47.5 82.5 1159 3499 208 47.5 87.5 1054 2418 209 47.5 92.5 1128 153 210 47.5 97.5 1008 126 211 47.5 102.5 949 941 212 47.5 107.5 1180 546 213 47.5 112.5 1008 699 214 47.5 117.5 979 1424 215 47.5 122.5 1015 743 216 47.5 127.5 1025 829 217 47.5 132.5 882 5226 218 47.5 137.5 792 8087 219 47.5 142.5 666 11779 220 47.5 147.5 722 639 221 47.5 152.5 734 3099 238 47.5 -122.5 900 76 239 47.5 -117.5 1465 48 240 47.5 -112.5 1482 45 241 47.5 -107.5 1643 51 242 47.5 -102.5 1385 69 243 47.5 -97.5 1377 106 244 47.5 -92.5 1091 71 245 47.5 -87.5 889 32 246 47.5 -82.5 1091 58 247 47.5 -77.5 1026 66 248 47.5 -72.5 894 53 249 47.5 -67.5 1155 37 261 47.5 -7.5 618 410 262 47.5 -2.5 628 3216 263 42.5 2.5 831 443 264 42.5 7.5 698 1422 265 42.5 12.5 667 1749 266 42.5 17.5 932 1051 267 42.5 22.5 1049 6799 268 42.5 27.5 886 6265 269 42.5 32.5 938 897 270 42.5 37.5 829 2830 271 42.5 42.5 939 11995 272 42.5 47.5 941 3110 273 42.5 52.5 1049 844 274 42.5 57.5 969 1858 275 42.5 62.5 1009 1419 276 42.5 67.5 1115 4640 277 42.5 72.5 1301 6959 278 42.5 77.5 1004 5601 279 42.5 82.5 1336 2140 280 42.5 87.5 1708 576 281 42.5 92.5 1695 494 282 42.5 97.5 1588 238 283 42.5 102.5 1508 295 284 42.5 107.5 958 412 285 42.5 112.5 1100 2219 286 42.5 117.5 1148 1324 287 42.5 122.5 1154 779 288 42.5 127.5 867 1060 289 42.5 132.5 895 4248 290 42.5 137.5 751 31 291 42.5 142.5 842 227 292 42.5 147.5 687 1054 312 42.5 -112.5 1430 144 314 42.5 -102.5 1356 109 315 42.5 -97.5 1202 398 316 42.5 -92.5 1181 109 317 42.5 -87.5 1065 175 318 42.5 -82.5 1006 159 319 42.5 -77.5 982 128 320 42.5 -72.5 992 116 333 42.5 -7.5 594 3144 334 42.5 -2.5 679 1602 335 37.5 2.5 688 529 336 37.5 7.5 782 3099 337 37.5 12.5 768 1144 338 37.5 17.5 682 364 339 37.5 22.5 694 532 340 37.5 27.5 804 562 341 37.5 32.5 962 506 342 37.5 37.5 877 1143 343 37.5 42.5 1068 388 344 37.5 47.5 937 2153 345 37.5 52.5 971 1540 346 37.5 57.5 1081 3097 347 37.5 62.5 1070 2446 348 37.5 67.5 1191 6559 349 37.5 72.5 1172 6537 350 37.5 77.5 1887 900 352 37.5 87.5 1866 35 353 37.5 92.5 1462 282 354 37.5 97.5 1325 3061 355 37.5 102.5 1133 7162 356 37.5 107.5 1340 1205 357 37.5 112.5 1114 952 358 37.5 117.5 978 769 359 37.5 122.5 1102 187 360 37.5 127.5 923 311 362 37.5 137.5 744 144 363 37.5 142.5 1074 183 385 37.5 -107.5 1771 46 386 37.5 -102.5 1397 153 387 37.5 -97.5 1112 518 388 37.5 -92.5 866 530 389 37.5 -87.5 822 196 390 37.5 -82.5 1009 326 391 37.5 -77.5 988 596 400 37.5 -32.5 660 90 401 37.5 -27.5 529 386 405 37.5 -7.5 601 1646 406 37.5 -2.5 769 1126 407 32.5 2.5 1071 131 408 32.5 7.5 1114 323 409 32.5 12.5 843 516 410 32.5 17.5 1035 31 411 32.5 22.5 900 93 412 32.5 27.5 623 52 413 32.5 32.5 790 451 414 32.5 37.5 870 444 416 32.5 47.5 1114 783 417 32.5 52.5 1018 115 418 32.5 57.5 1052 335 420 32.5 67.5 1015 158 421 32.5 72.5 1135 1304 422 32.5 77.5 1110 146 423 32.5 82.5 1570 454 424 32.5 87.5 1351 395 425 32.5 92.5 1632 2698 426 32.5 97.5 1325 12073 427 32.5 102.5 1370 12870 428 32.5 107.5 1325 983 429 32.5 112.5 955 860 430 32.5 117.5 965 735 431 32.5 122.5 822 317 432 32.5 127.5 878 126 434 32.5 137.5 566 48 456 32.5 -112.5 1851 41 457 32.5 -107.5 1583 49 458 32.5 -102.5 1090 335 459 32.5 -97.5 879 446 460 32.5 -92.5 646 339 461 32.5 -87.5 571 226 462 32.5 -82.5 967 849 466 32.5 -62.5 450 42 475 32.5 -17.5 506 171 477 32.5 -7.5 609 1528 478 32.5 -2.5 790 899 479 27.5 2.5 1347 35 480 27.5 7.5 1350 83 486 27.5 37.5 852 31 487 27.5 42.5 1085 197 488 27.5 47.5 1253 51 489 27.5 52.5 1015 319 490 27.5 57.5 820 86 491 27.5 62.5 1088 156 492 27.5 67.5 1362 95 493 27.5 72.5 1185 128 494 27.5 77.5 1011 716 495 27.5 82.5 939 490 496 27.5 87.5 1065 1989 497 27.5 92.5 1032 2569 498 27.5 97.5 778 3056 499 27.5 102.5 1203 4549 500 27.5 107.5 955 2673 501 27.5 112.5 946 3495 502 27.5 117.5 909 2717 503 27.5 122.5 662 651 527 27.5 -117.5 1104 42 529 27.5 -107.5 783 33 530 27.5 -102.5 731 167 531 27.5 -97.5 594 303 532 27.5 -92.5 536 172 534 27.5 -82.5 827 742 535 27.5 -77.5 546 835 548 27.5 -12.5 993 39 552 22.5 7.5 1664 114 558 22.5 37.5 1200 55 559 22.5 42.5 848 146 560 22.5 47.5 1036 62 561 22.5 52.5 1131 57 562 22.5 57.5 902 146 565 22.5 72.5 870 50 566 22.5 77.5 937 544 567 22.5 82.5 862 522 568 22.5 87.5 699 1478 569 22.5 92.5 515 2704 570 22.5 97.5 974 2651 571 22.5 102.5 1121 4492 572 22.5 107.5 785 3594 573 22.5 112.5 730 4049 574 22.5 117.5 725 1059 575 22.5 122.5 549 1029 602 22.5 -102.5 812 232 603 22.5 -97.5 669 165 605 22.5 -87.5 949 46 606 22.5 -82.5 650 2475 607 22.5 -77.5 640 1457 608 22.5 -72.5 517 480 624 17.5 7.5 1490 76 630 17.5 37.5 943 100 631 17.5 42.5 904 407 633 17.5 52.5 973 53 637 17.5 72.5 768 402 638 17.5 77.5 823 955 639 17.5 82.5 912 433 641 17.5 92.5 590 236 642 17.5 97.5 766 7684 643 17.5 102.5 756 12140 644 17.5 107.5 781 1057 645 17.5 112.5 732 305 646 17.5 117.5 474 290 647 17.5 122.5 601 1590 674 17.5 -102.5 860 56 675 17.5 -97.5 660 583 676 17.5 -92.5 853 150 677 17.5 -87.5 732 561 678 17.5 -82.5 560 326 679 17.5 -77.5 660 1472 680 17.5 -72.5 499 463 681 17.5 -67.5 512 324 682 17.5 -62.5 505 52 693 17.5 -7.5 1328 73 694 17.5 -2.5 1470 38 695 12.5 2.5 1016 1210 696 12.5 7.5 1457 610 697 12.5 12.5 1277 302 698 12.5 17.5 1347 59 699 12.5 22.5 1179 134 701 12.5 32.5 1790 31 702 12.5 37.5 775 514 703 12.5 42.5 856 58 704 12.5 47.5 1024 39 709 12.5 72.5 676 209 710 12.5 77.5 740 1697 711 12.5 82.5 769 129 713 12.5 92.5 625 475 714 12.5 97.5 753 5368 715 12.5 102.5 761 10953 716 12.5 107.5 707 682 719 12.5 122.5 538 3799 720 12.5 127.5 466 694 723 12.5 142.5 449 74 748 12.5 -92.5 1087 333 749 12.5 -87.5 929 872 750 12.5 -82.5 1187 148 751 12.5 -77.5 959 76 752 12.5 -72.5 719 253 753 12.5 -67.5 605 356 754 12.5 -62.5 416 273 764 12.5 -12.5 1172 140 765 12.5 -7.5 1346 680 766 12.5 -2.5 1103 1484 767 7.5 2.5 546 2736 768 7.5 7.5 684 855 769 7.5 12.5 667 1713 770 7.5 17.5 1093 182 771 7.5 22.5 1138 190 772 7.5 27.5 1128 160 774 7.5 37.5 751 579 775 7.5 42.5 812 196 781 7.5 72.5 755 202 782 7.5 77.5 579 1905 783 7.5 82.5 531 579 785 7.5 92.5 589 56 786 7.5 97.5 664 7526 787 7.5 102.5 566 6080 788 7.5 107.5 693 315 790 7.5 117.5 459 966 791 7.5 122.5 545 1697 792 7.5 127.5 509 747 793 7.5 132.5 450 189 794 7.5 137.5 450 188 797 7.5 152.5 457 67 798 7.5 157.5 496 70 800 7.5 167.5 438 70 801 7.5 172.5 468 85 823 7.5 -77.5 502 178 824 7.5 -72.5 525 916 825 7.5 -67.5 631 242 826 7.5 -62.5 431 175 827 7.5 -57.5 517 393 828 7.5 -52.5 351 64 836 7.5 -12.5 616 321 837 7.5 -7.5 635 1702 838 7.5 -2.5 525 1742 840 2.5 7.5 507 5513 841 2.5 12.5 588 1479 842 2.5 17.5 1077 274 843 2.5 22.5 1099 219 845 2.5 32.5 749 984 846 2.5 37.5 683 1801 847 2.5 42.5 812 381 848 2.5 47.5 907 34 853 2.5 72.5 460 151 858 2.5 97.5 530 4364 859 2.5 102.5 439 5678 860 2.5 107.5 476 31 861 2.5 112.5 427 1849 862 2.5 117.5 733 75 863 2.5 122.5 625 380 864 2.5 127.5 469 429 873 2.5 172.5 457 922 879 2.5 -157.5 450 264 895 2.5 -77.5 794 136 898 2.5 -62.5 454 184 899 2.5 -57.5 564 326 900 2.5 -52.5 435 160 909 2.5 -7.5 522 1571 910 2.5 -2.5 517 273 912 -2.5 7.5 462 544 913 -2.5 12.5 609 3152 914 -2.5 17.5 714 961 916 -2.5 27.5 799 418 917 -2.5 32.5 647 1360 918 -2.5 37.5 646 2227 919 -2.5 42.5 576 393 922 -2.5 57.5 627 299 931 -2.5 102.5 545 2150 932 -2.5 107.5 541 1114 933 -2.5 112.5 622 194 934 -2.5 117.5 660 722 935 -2.5 122.5 580 264 936 -2.5 127.5 568 124 937 -2.5 132.5 472 481 938 -2.5 137.5 460 461 939 -2.5 142.5 455 161 940 -2.5 147.5 500 49 941 -2.5 152.5 676 44 946 -2.5 177.5 459 428 966 -2.5 -82.5 1130 34 970 -2.5 -62.5 449 90 972 -2.5 -52.5 499 53 985 -7.5 12.5 633 83 989 -7.5 32.5 676 157 990 -7.5 37.5 515 1302 997 -7.5 72.5 574 70 1004 -7.5 107.5 615 1762 1005 -7.5 112.5 679 1046 1006 -7.5 117.5 638 943 1007 -7.5 122.5 562 178 1008 -7.5 127.5 590 45 1009 -7.5 132.5 481 89 1011 -7.5 142.5 488 90 1012 -7.5 147.5 549 300 1014 -7.5 157.5 511 627 1015 -7.5 162.5 483 381 1018 -7.5 177.5 466 3140 1020 -7.5 -172.5 716 972 1023 -7.5 -157.5 488 65 1027 -7.5 -137.5 510 94 1039 -7.5 -77.5 1486 44 1042 -7.5 -62.5 849 49 1045 -7.5 -47.5 780 152 1048 -7.5 -32.5 822 65 1057 -12.5 12.5 550 84 1058 -12.5 17.5 793 76 1059 -12.5 22.5 1309 34 1060 -12.5 27.5 1279 141 1061 -12.5 32.5 1192 232 1062 -12.5 37.5 724 154 1063 -12.5 42.5 797 380 1064 -12.5 47.5 666 1478 1065 -12.5 52.5 777 410 1066 -12.5 57.5 506 130 1074 -12.5 97.5 485 190 1079 -12.5 122.5 506 315 1081 -12.5 132.5 758 121 1083 -12.5 142.5 813 165 1087 -12.5 162.5 496 314 1088 -12.5 167.5 617 139 1090 -12.5 177.5 492 1110 1091 -12.5 -177.5 402 1023 1092 -12.5 -172.5 607 346 1093 -12.5 -167.5 496 104 1094 -12.5 -162.5 632 63 1097 -12.5 -147.5 466 64 1114 -12.5 -62.5 611 257 1115 -12.5 -57.5 1352 176 1117 -12.5 -47.5 1088 51 1130 -17.5 17.5 1286 245 1131 -17.5 22.5 1144 249 1132 -17.5 27.5 1370 111 1133 -17.5 32.5 946 234 1134 -17.5 37.5 733 348 1135 -17.5 42.5 760 944 1136 -17.5 47.5 721 1333 1137 -17.5 52.5 566 226 1138 -17.5 57.5 509 77 1139 -17.5 62.5 619 34 1151 -17.5 122.5 854 108 1152 -17.5 127.5 905 54 1155 -17.5 142.5 1140 231 1156 -17.5 147.5 744 108 1160 -17.5 167.5 622 439 1162 -17.5 177.5 660 2207 1163 -17.5 -177.5 585 725 1164 -17.5 -172.5 710 647 1165 -17.5 -167.5 750 345 1166 -17.5 -162.5 545 59 1167 -17.5 -157.5 466 156 1168 -17.5 -152.5 455 127 1169 -17.5 -147.5 468 214 1170 -17.5 -142.5 471 270 1185 -17.5 -67.5 801 226 1186 -17.5 -62.5 595 329 1188 -17.5 -52.5 863 65 1189 -17.5 -47.5 886 79 1202 -22.5 17.5 1404 241 1203 -22.5 22.5 1124 191 1204 -22.5 27.5 1214 130 1205 -22.5 32.5 1646 51 1207 -22.5 42.5 777 745 1208 -22.5 47.5 698 964 1210 -22.5 57.5 585 213 1221 -22.5 112.5 1406 58 1222 -22.5 117.5 1273 57 1227 -22.5 142.5 929 122 1228 -22.5 147.5 880 115 1229 -22.5 152.5 579 117 1232 -22.5 167.5 635 202 1235 -22.5 -177.5 549 133 1239 -22.5 -157.5 588 129 1241 -22.5 -147.5 426 34 1243 -22.5 -137.5 489 198 1244 -22.5 -132.5 451 191 1257 -22.5 -67.5 1004 128 1259 -22.5 -57.5 766 37 1260 -22.5 -52.5 655 58 1261 -22.5 -47.5 847 105 1262 -22.5 -42.5 836 73 1274 -27.5 17.5 1136 219 1275 -27.5 22.5 1520 571 1276 -27.5 27.5 1383 377 1277 -27.5 32.5 740 191 1280 -27.5 47.5 691 332 1293 -27.5 112.5 1039 54 1294 -27.5 117.5 1636 50 1296 -27.5 127.5 1712 40 1297 -27.5 132.5 2116 43 1299 -27.5 142.5 1067 113 1300 -27.5 147.5 1405 46 1307 -27.5 -177.5 541 75 1314 -27.5 -142.5 527 32 1329 -27.5 -67.5 1167 98 1330 -27.5 -62.5 905 289 1331 -27.5 -57.5 873 1080 1332 -27.5 -52.5 797 114 1333 -27.5 -47.5 750 47 1346 -32.5 17.5 1033 59 1347 -32.5 22.5 1229 318 1348 -32.5 27.5 1117 309 1349 -32.5 32.5 507 39 1366 -32.5 117.5 752 303 1367 -32.5 122.5 1395 63 1368 -32.5 127.5 1476 34 1370 -32.5 137.5 1322 49 1372 -32.5 147.5 1383 61 1377 -32.5 172.5 386 183 1401 -32.5 -67.5 1152 561 1402 -32.5 -62.5 864 730 1403 -32.5 -57.5 898 1118 1404 -32.5 -52.5 728 142 1442 -37.5 137.5 562 100 1443 -37.5 142.5 941 64 1444 -37.5 147.5 1046 97 1445 -37.5 152.5 651 50 1449 -37.5 172.5 611 132 1450 -37.5 177.5 758 76 1473 -37.5 -67.5 1403 97 1474 -37.5 -62.5 967 312 1475 -37.5 -57.5 888 135 1516 -42.5 147.5 720 108 1521 -42.5 172.5 829 304 1522 -42.5 177.5 579 35 1523 -42.5 -177.5 524 81 1544 -42.5 -72.5 1053 31 1545 -42.5 -67.5 1190 72 1546 -42.5 -62.5 1021 66 1592 -47.5 167.5 493 280 1616 -47.5 -72.5 960 48 1646 -52.5 155.0 531 43 1647 -52.5 165.0 658 151 1659 -52.5 -75.0 544 168 1660 -52.5 -65.0 1015 42 1661 -52.5 -55.0 371 51