Cumulonimbus Average Base Height (meters) March, April, May (1954 - 1997) Night, Ship Observations Only Global Average: 486 Zonal Averages 26 zones Lat.N Average 77.5 550 72.5 474 67.5 561 62.5 645 57.5 553 52.5 525 47.5 507 42.5 521 37.5 522 32.5 527 27.5 506 22.5 492 17.5 490 12.5 506 7.5 474 2.5 458 -2.5 477 -7.5 448 -12.5 459 -17.5 467 -22.5 471 -27.5 479 -32.5 482 -37.5 485 -42.5 529 -47.5 664 Grid Box Averages 706 filled boxes Box # Lat.N Lon.E Average 11 77.5 10.0 577 12 77.5 30.0 520 29 72.5 10.0 560 30 72.5 30.0 559 31 72.5 50.0 502 46 72.5 350.0 310 47 67.5 5.0 532 48 67.5 15.0 556 50 67.5 35.0 614 51 67.5 45.0 695 80 67.5 335.0 614 81 67.5 345.0 553 82 67.5 355.0 553 83 62.5 5.0 545 100 62.5 175.0 684 115 62.5 325.0 526 116 62.5 335.0 700 117 62.5 345.0 728 118 62.5 355.0 675 119 57.5 5.0 587 120 57.5 15.0 628 121 57.5 25.0 637 134 57.5 155.0 765 135 57.5 165.0 603 136 57.5 175.0 575 137 57.5 185.0 525 138 57.5 195.0 507 139 57.5 205.0 478 140 57.5 215.0 475 141 57.5 225.0 554 149 57.5 305.0 605 150 57.5 315.0 673 151 57.5 325.0 596 152 57.5 335.0 523 153 57.5 345.0 492 154 57.5 355.0 535 155 52.5 5.0 629 156 52.5 15.0 732 170 52.5 155.0 619 171 52.5 165.0 590 172 52.5 175.0 545 173 52.5 185.0 510 174 52.5 195.0 504 175 52.5 205.0 543 176 52.5 215.0 533 177 52.5 225.0 499 178 52.5 235.0 652 186 52.5 315.0 549 187 52.5 325.0 492 188 52.5 335.0 496 189 52.5 345.0 498 190 52.5 355.0 564 219 47.5 142.5 692 220 47.5 147.5 637 221 47.5 152.5 552 222 47.5 157.5 606 223 47.5 162.5 492 224 47.5 167.5 505 225 47.5 172.5 540 226 47.5 177.5 531 227 47.5 182.5 544 228 47.5 187.5 499 229 47.5 192.5 573 230 47.5 197.5 515 231 47.5 202.5 477 232 47.5 207.5 507 233 47.5 212.5 464 234 47.5 217.5 598 235 47.5 222.5 431 236 47.5 227.5 510 237 47.5 232.5 516 238 47.5 237.5 597 251 47.5 302.5 592 252 47.5 307.5 472 253 47.5 312.5 492 254 47.5 317.5 516 255 47.5 322.5 450 256 47.5 327.5 459 257 47.5 332.5 477 258 47.5 337.5 469 259 47.5 342.5 491 260 47.5 347.5 480 261 47.5 352.5 522 262 47.5 357.5 561 263 42.5 2.5 587 264 42.5 7.5 740 265 42.5 12.5 681 266 42.5 17.5 712 268 42.5 27.5 700 269 42.5 32.5 681 290 42.5 137.5 638 291 42.5 142.5 587 292 42.5 147.5 708 293 42.5 152.5 610 294 42.5 157.5 527 295 42.5 162.5 558 296 42.5 167.5 532 297 42.5 172.5 479 298 42.5 177.5 486 299 42.5 182.5 488 300 42.5 187.5 458 301 42.5 192.5 523 302 42.5 197.5 487 303 42.5 202.5 520 304 42.5 207.5 501 305 42.5 212.5 491 306 42.5 217.5 499 307 42.5 222.5 524 308 42.5 227.5 489 309 42.5 232.5 546 310 42.5 237.5 544 320 42.5 287.5 629 321 42.5 292.5 673 322 42.5 297.5 586 323 42.5 302.5 502 324 42.5 307.5 495 325 42.5 312.5 476 326 42.5 317.5 490 327 42.5 322.5 474 328 42.5 327.5 470 329 42.5 332.5 486 330 42.5 337.5 476 331 42.5 342.5 498 332 42.5 347.5 490 333 42.5 352.5 539 334 42.5 357.5 625 335 37.5 2.5 616 336 37.5 7.5 600 337 37.5 12.5 612 338 37.5 17.5 658 339 37.5 22.5 651 340 37.5 27.5 766 361 37.5 132.5 661 362 37.5 137.5 545 363 37.5 142.5 610 364 37.5 147.5 532 365 37.5 152.5 552 366 37.5 157.5 514 367 37.5 162.5 510 368 37.5 167.5 495 369 37.5 172.5 489 370 37.5 177.5 531 371 37.5 182.5 430 372 37.5 187.5 533 373 37.5 192.5 539 374 37.5 197.5 480 375 37.5 202.5 491 376 37.5 207.5 524 377 37.5 212.5 542 378 37.5 217.5 477 379 37.5 222.5 528 380 37.5 227.5 491 381 37.5 232.5 545 382 37.5 237.5 546 391 37.5 282.5 586 392 37.5 287.5 547 393 37.5 292.5 513 394 37.5 297.5 501 395 37.5 302.5 485 396 37.5 307.5 460 397 37.5 312.5 539 398 37.5 317.5 467 399 37.5 322.5 493 400 37.5 327.5 510 401 37.5 332.5 509 402 37.5 337.5 505 403 37.5 342.5 537 404 37.5 347.5 521 405 37.5 352.5 572 406 37.5 357.5 615 410 32.5 17.5 574 411 32.5 22.5 569 412 32.5 27.5 582 413 32.5 32.5 657 431 32.5 122.5 912 432 32.5 127.5 642 433 32.5 132.5 538 434 32.5 137.5 540 435 32.5 142.5 525 436 32.5 147.5 504 437 32.5 152.5 484 438 32.5 157.5 511 439 32.5 162.5 485 440 32.5 167.5 468 441 32.5 172.5 555 442 32.5 177.5 509 443 32.5 182.5 464 444 32.5 187.5 492 445 32.5 192.5 503 446 32.5 197.5 511 447 32.5 202.5 514 448 32.5 207.5 516 449 32.5 212.5 495 450 32.5 217.5 499 451 32.5 222.5 539 452 32.5 227.5 489 453 32.5 232.5 571 454 32.5 237.5 576 455 32.5 242.5 645 462 32.5 277.5 636 463 32.5 282.5 541 464 32.5 287.5 513 465 32.5 292.5 501 466 32.5 297.5 520 467 32.5 302.5 459 468 32.5 307.5 500 469 32.5 312.5 519 470 32.5 317.5 520 471 32.5 322.5 519 472 32.5 327.5 521 473 32.5 332.5 538 474 32.5 337.5 548 475 32.5 342.5 554 476 32.5 347.5 561 477 32.5 352.5 667 503 27.5 122.5 544 504 27.5 127.5 508 505 27.5 132.5 522 506 27.5 137.5 487 507 27.5 142.5 547 508 27.5 147.5 487 509 27.5 152.5 467 510 27.5 157.5 439 511 27.5 162.5 490 512 27.5 167.5 500 513 27.5 172.5 460 514 27.5 177.5 497 515 27.5 182.5 497 516 27.5 187.5 490 517 27.5 192.5 503 518 27.5 197.5 481 519 27.5 202.5 397 520 27.5 207.5 479 521 27.5 212.5 466 522 27.5 217.5 458 523 27.5 222.5 476 524 27.5 227.5 547 525 27.5 232.5 540 526 27.5 237.5 501 527 27.5 242.5 542 528 27.5 247.5 611 531 27.5 262.5 505 532 27.5 267.5 534 533 27.5 272.5 497 534 27.5 277.5 542 535 27.5 282.5 535 536 27.5 287.5 511 537 27.5 292.5 502 538 27.5 297.5 514 539 27.5 302.5 512 540 27.5 307.5 502 541 27.5 312.5 515 542 27.5 317.5 513 543 27.5 322.5 539 544 27.5 327.5 611 545 27.5 332.5 520 546 27.5 337.5 562 547 27.5 342.5 556 548 27.5 347.5 593 562 22.5 57.5 672 573 22.5 112.5 522 574 22.5 117.5 548 575 22.5 122.5 469 576 22.5 127.5 477 577 22.5 132.5 427 578 22.5 137.5 445 579 22.5 142.5 477 580 22.5 147.5 432 581 22.5 152.5 455 582 22.5 157.5 455 583 22.5 162.5 550 584 22.5 167.5 418 585 22.5 172.5 502 586 22.5 177.5 480 587 22.5 182.5 459 588 22.5 187.5 457 589 22.5 192.5 483 590 22.5 197.5 518 591 22.5 202.5 527 592 22.5 207.5 467 593 22.5 212.5 462 594 22.5 217.5 478 595 22.5 222.5 460 596 22.5 227.5 492 600 22.5 247.5 592 601 22.5 252.5 604 603 22.5 262.5 462 604 22.5 267.5 555 605 22.5 272.5 480 606 22.5 277.5 504 607 22.5 282.5 549 608 22.5 287.5 526 609 22.5 292.5 513 610 22.5 297.5 536 611 22.5 302.5 513 612 22.5 307.5 505 613 22.5 312.5 492 614 22.5 317.5 544 615 22.5 322.5 542 616 22.5 327.5 520 618 22.5 337.5 544 619 22.5 342.5 633 634 17.5 57.5 621 640 17.5 87.5 663 644 17.5 107.5 637 645 17.5 112.5 572 646 17.5 117.5 500 647 17.5 122.5 507 648 17.5 127.5 455 649 17.5 132.5 414 650 17.5 137.5 462 651 17.5 142.5 428 652 17.5 147.5 450 653 17.5 152.5 483 654 17.5 157.5 416 655 17.5 162.5 496 656 17.5 167.5 449 657 17.5 172.5 465 658 17.5 177.5 486 659 17.5 182.5 485 660 17.5 187.5 527 661 17.5 192.5 471 662 17.5 197.5 563 663 17.5 202.5 436 664 17.5 207.5 527 665 17.5 212.5 495 666 17.5 217.5 456 667 17.5 222.5 416 668 17.5 227.5 562 669 17.5 232.5 429 673 17.5 252.5 516 674 17.5 257.5 541 675 17.5 262.5 549 676 17.5 267.5 554 677 17.5 272.5 506 678 17.5 277.5 467 679 17.5 282.5 478 680 17.5 287.5 530 681 17.5 292.5 517 682 17.5 297.5 552 683 17.5 302.5 505 684 17.5 307.5 476 685 17.5 312.5 527 686 17.5 317.5 498 687 17.5 322.5 490 690 17.5 337.5 635 691 17.5 342.5 771 703 12.5 42.5 688 704 12.5 47.5 661 705 12.5 52.5 593 706 12.5 57.5 537 707 12.5 62.5 535 709 12.5 72.5 569 710 12.5 77.5 537 711 12.5 82.5 691 712 12.5 87.5 657 713 12.5 92.5 611 715 12.5 102.5 606 716 12.5 107.5 598 717 12.5 112.5 488 718 12.5 117.5 571 719 12.5 122.5 610 720 12.5 127.5 420 721 12.5 132.5 411 722 12.5 137.5 489 723 12.5 142.5 432 724 12.5 147.5 414 725 12.5 152.5 566 729 12.5 172.5 560 730 12.5 177.5 523 731 12.5 182.5 501 745 12.5 252.5 455 746 12.5 257.5 486 747 12.5 262.5 488 748 12.5 267.5 520 749 12.5 272.5 505 750 12.5 277.5 463 751 12.5 282.5 468 752 12.5 287.5 498 753 12.5 292.5 481 754 12.5 297.5 497 755 12.5 302.5 490 756 12.5 307.5 519 757 12.5 312.5 474 761 12.5 332.5 521 763 12.5 342.5 651 767 7.5 2.5 522 777 7.5 52.5 520 778 7.5 57.5 606 779 7.5 62.5 537 780 7.5 67.5 553 781 7.5 72.5 501 782 7.5 77.5 484 783 7.5 82.5 499 784 7.5 87.5 474 785 7.5 92.5 481 786 7.5 97.5 517 787 7.5 102.5 549 788 7.5 107.5 504 789 7.5 112.5 464 790 7.5 117.5 493 791 7.5 122.5 493 792 7.5 127.5 401 793 7.5 132.5 412 794 7.5 137.5 484 795 7.5 142.5 445 796 7.5 147.5 407 797 7.5 152.5 442 803 7.5 182.5 439 804 7.5 187.5 467 818 7.5 257.5 492 819 7.5 262.5 425 820 7.5 267.5 461 821 7.5 272.5 487 822 7.5 277.5 464 823 7.5 282.5 505 827 7.5 302.5 498 828 7.5 307.5 463 829 7.5 312.5 478 830 7.5 317.5 475 833 7.5 332.5 479 835 7.5 342.5 510 836 7.5 347.5 498 837 7.5 352.5 504 838 7.5 357.5 513 839 2.5 2.5 471 840 2.5 7.5 495 848 2.5 47.5 529 849 2.5 52.5 533 850 2.5 57.5 496 851 2.5 62.5 559 852 2.5 67.5 457 853 2.5 72.5 413 854 2.5 77.5 478 855 2.5 82.5 487 856 2.5 87.5 419 857 2.5 92.5 460 858 2.5 97.5 470 859 2.5 102.5 553 860 2.5 107.5 502 861 2.5 112.5 475 863 2.5 122.5 417 864 2.5 127.5 415 865 2.5 132.5 379 866 2.5 137.5 418 867 2.5 142.5 436 868 2.5 147.5 413 869 2.5 152.5 397 891 2.5 262.5 456 892 2.5 267.5 433 893 2.5 272.5 437 894 2.5 277.5 511 901 2.5 312.5 509 902 2.5 317.5 425 903 2.5 322.5 420 904 2.5 327.5 462 905 2.5 332.5 477 906 2.5 337.5 461 907 2.5 342.5 503 908 2.5 347.5 489 909 2.5 352.5 493 910 2.5 357.5 478 911 -2.5 2.5 527 912 -2.5 7.5 538 919 -2.5 42.5 594 920 -2.5 47.5 465 921 -2.5 52.5 513 922 -2.5 57.5 570 923 -2.5 62.5 450 924 -2.5 67.5 465 925 -2.5 72.5 436 926 -2.5 77.5 468 927 -2.5 82.5 430 928 -2.5 87.5 457 929 -2.5 92.5 419 930 -2.5 97.5 509 932 -2.5 107.5 539 934 -2.5 117.5 457 936 -2.5 127.5 445 937 -2.5 132.5 461 939 -2.5 142.5 472 940 -2.5 147.5 446 941 -2.5 152.5 397 949 -2.5 192.5 488 961 -2.5 252.5 492 962 -2.5 257.5 463 963 -2.5 262.5 382 964 -2.5 267.5 440 965 -2.5 272.5 478 966 -2.5 277.5 566 974 -2.5 317.5 519 975 -2.5 322.5 460 976 -2.5 327.5 444 977 -2.5 332.5 533 978 -2.5 337.5 453 979 -2.5 342.5 508 981 -2.5 352.5 504 982 -2.5 357.5 575 983 -7.5 2.5 632 984 -7.5 7.5 534 985 -7.5 12.5 538 991 -7.5 42.5 464 992 -7.5 47.5 461 996 -7.5 67.5 504 997 -7.5 72.5 428 998 -7.5 77.5 482 999 -7.5 82.5 494 1000 -7.5 87.5 414 1001 -7.5 92.5 416 1002 -7.5 97.5 463 1003 -7.5 102.5 422 1004 -7.5 107.5 451 1005 -7.5 112.5 429 1006 -7.5 117.5 510 1007 -7.5 122.5 397 1008 -7.5 127.5 457 1009 -7.5 132.5 416 1010 -7.5 137.5 402 1012 -7.5 147.5 444 1013 -7.5 152.5 388 1014 -7.5 157.5 430 1015 -7.5 162.5 426 1019 -7.5 182.5 403 1020 -7.5 187.5 411 1021 -7.5 192.5 430 1031 -7.5 242.5 397 1035 -7.5 262.5 456 1036 -7.5 267.5 438 1038 -7.5 277.5 660 1047 -7.5 322.5 568 1048 -7.5 327.5 483 1049 -7.5 332.5 460 1053 -7.5 352.5 498 1054 -7.5 357.5 498 1055 -12.5 2.5 513 1056 -12.5 7.5 545 1063 -12.5 42.5 459 1064 -12.5 47.5 415 1065 -12.5 52.5 518 1067 -12.5 62.5 387 1068 -12.5 67.5 416 1069 -12.5 72.5 462 1070 -12.5 77.5 502 1071 -12.5 82.5 459 1072 -12.5 87.5 423 1073 -12.5 92.5 402 1074 -12.5 97.5 411 1076 -12.5 107.5 491 1079 -12.5 122.5 419 1082 -12.5 137.5 505 1083 -12.5 142.5 438 1084 -12.5 147.5 463 1085 -12.5 152.5 413 1086 -12.5 157.5 429 1087 -12.5 162.5 457 1088 -12.5 167.5 430 1090 -12.5 177.5 424 1091 -12.5 182.5 461 1092 -12.5 187.5 441 1093 -12.5 192.5 439 1097 -12.5 212.5 523 1098 -12.5 217.5 433 1099 -12.5 222.5 462 1105 -12.5 252.5 507 1106 -12.5 257.5 519 1111 -12.5 282.5 649 1119 -12.5 322.5 528 1120 -12.5 327.5 536 1122 -12.5 337.5 499 1123 -12.5 342.5 479 1125 -12.5 352.5 520 1126 -12.5 357.5 548 1127 -17.5 2.5 491 1128 -17.5 7.5 526 1129 -17.5 12.5 786 1134 -17.5 37.5 516 1135 -17.5 42.5 471 1137 -17.5 52.5 508 1138 -17.5 57.5 462 1139 -17.5 62.5 422 1140 -17.5 67.5 421 1143 -17.5 82.5 475 1144 -17.5 87.5 477 1145 -17.5 92.5 428 1146 -17.5 97.5 446 1147 -17.5 102.5 495 1148 -17.5 107.5 513 1156 -17.5 147.5 474 1157 -17.5 152.5 446 1158 -17.5 157.5 388 1159 -17.5 162.5 515 1161 -17.5 172.5 383 1162 -17.5 177.5 435 1163 -17.5 182.5 435 1164 -17.5 187.5 440 1165 -17.5 192.5 417 1166 -17.5 197.5 507 1167 -17.5 202.5 495 1168 -17.5 207.5 470 1169 -17.5 212.5 508 1173 -17.5 232.5 486 1175 -17.5 242.5 479 1176 -17.5 247.5 543 1191 -17.5 322.5 544 1196 -17.5 347.5 461 1197 -17.5 352.5 467 1198 -17.5 357.5 477 1199 -22.5 2.5 469 1200 -22.5 7.5 524 1201 -22.5 12.5 614 1206 -22.5 37.5 500 1208 -22.5 47.5 430 1209 -22.5 52.5 466 1210 -22.5 57.5 470 1216 -22.5 87.5 483 1217 -22.5 92.5 474 1218 -22.5 97.5 496 1219 -22.5 102.5 524 1229 -22.5 152.5 492 1231 -22.5 162.5 445 1232 -22.5 167.5 473 1233 -22.5 172.5 427 1234 -22.5 177.5 415 1235 -22.5 182.5 382 1236 -22.5 187.5 436 1243 -22.5 222.5 524 1245 -22.5 232.5 408 1246 -22.5 237.5 452 1247 -22.5 242.5 493 1261 -22.5 312.5 680 1262 -22.5 317.5 653 1263 -22.5 322.5 568 1269 -22.5 352.5 448 1270 -22.5 357.5 454 1271 -27.5 2.5 434 1272 -27.5 7.5 519 1273 -27.5 12.5 553 1277 -27.5 32.5 483 1278 -27.5 37.5 479 1279 -27.5 42.5 430 1280 -27.5 47.5 440 1281 -27.5 52.5 453 1288 -27.5 87.5 504 1289 -27.5 92.5 461 1290 -27.5 97.5 435 1291 -27.5 102.5 509 1292 -27.5 107.5 541 1293 -27.5 112.5 623 1301 -27.5 152.5 499 1302 -27.5 157.5 467 1303 -27.5 162.5 468 1304 -27.5 167.5 472 1305 -27.5 172.5 520 1306 -27.5 177.5 408 1307 -27.5 182.5 434 1308 -27.5 187.5 446 1315 -27.5 222.5 455 1333 -27.5 312.5 578 1334 -27.5 317.5 627 1342 -27.5 357.5 474 1343 -32.5 2.5 465 1344 -32.5 7.5 492 1345 -32.5 12.5 483 1346 -32.5 17.5 501 1347 -32.5 22.5 597 1348 -32.5 27.5 511 1349 -32.5 32.5 516 1350 -32.5 37.5 481 1360 -32.5 87.5 454 1361 -32.5 92.5 433 1362 -32.5 97.5 501 1364 -32.5 107.5 477 1365 -32.5 112.5 510 1373 -32.5 152.5 547 1374 -32.5 157.5 526 1375 -32.5 162.5 471 1376 -32.5 167.5 470 1377 -32.5 172.5 470 1378 -32.5 177.5 415 1379 -32.5 182.5 455 1380 -32.5 187.5 430 1381 -32.5 192.5 463 1404 -32.5 307.5 623 1405 -32.5 312.5 543 1414 -32.5 357.5 531 1419 -37.5 22.5 564 1438 -37.5 117.5 523 1439 -37.5 122.5 477 1440 -37.5 127.5 459 1441 -37.5 132.5 504 1442 -37.5 137.5 515 1443 -37.5 142.5 441 1444 -37.5 147.5 517 1445 -37.5 152.5 509 1446 -37.5 157.5 492 1447 -37.5 162.5 469 1448 -37.5 167.5 445 1449 -37.5 172.5 537 1450 -37.5 177.5 508 1451 -37.5 182.5 427 1452 -37.5 187.5 441 1521 -42.5 172.5 613 1522 -42.5 177.5 485 1523 -42.5 182.5 450 1542 -42.5 277.5 652 1618 -47.5 297.5 664