Cumulonimbus Average Base Height (meters) September, October, November (1954 - 1997) Night, Ship Observations Only Global Average: 500 Zonal Averages 28 zones Lat.N Average 77.5 550 72.5 558 67.5 545 62.5 612 57.5 535 52.5 526 47.5 520 42.5 530 37.5 515 32.5 503 27.5 483 22.5 478 17.5 467 12.5 469 7.5 445 2.5 455 -2.5 460 -7.5 457 -12.5 459 -17.5 480 -22.5 491 -27.5 487 -32.5 475 -37.5 501 -42.5 545 -47.5 375 -52.5 718 -62.5 947 Grid Box Averages 698 filled boxes Box # Lat.N Lon.E Average 11 77.5 10.0 564 12 77.5 30.0 537 29 72.5 10.0 566 30 72.5 30.0 543 31 72.5 50.0 546 32 72.5 70.0 533 46 72.5 350.0 576 47 67.5 5.0 496 48 67.5 15.0 561 50 67.5 35.0 557 51 67.5 45.0 613 52 67.5 55.0 433 77 67.5 305.0 675 81 67.5 345.0 618 82 67.5 355.0 568 83 62.5 5.0 532 100 62.5 175.0 617 101 62.5 185.0 574 113 62.5 305.0 522 115 62.5 325.0 614 116 62.5 335.0 593 117 62.5 345.0 721 118 62.5 355.0 643 119 57.5 5.0 601 120 57.5 15.0 618 121 57.5 25.0 622 133 57.5 145.0 649 134 57.5 155.0 662 135 57.5 165.0 591 136 57.5 175.0 567 137 57.5 185.0 439 138 57.5 195.0 528 139 57.5 205.0 580 140 57.5 215.0 487 141 57.5 225.0 481 149 57.5 305.0 652 150 57.5 315.0 508 151 57.5 325.0 541 152 57.5 335.0 492 153 57.5 345.0 484 154 57.5 355.0 562 155 52.5 5.0 598 156 52.5 15.0 693 169 52.5 145.0 628 170 52.5 155.0 680 171 52.5 165.0 592 172 52.5 175.0 514 173 52.5 185.0 553 174 52.5 195.0 511 175 52.5 205.0 476 176 52.5 215.0 527 177 52.5 225.0 491 178 52.5 235.0 521 185 52.5 305.0 561 186 52.5 315.0 502 187 52.5 325.0 502 188 52.5 335.0 493 189 52.5 345.0 495 190 52.5 355.0 542 219 47.5 142.5 629 220 47.5 147.5 681 221 47.5 152.5 683 222 47.5 157.5 616 223 47.5 162.5 531 224 47.5 167.5 478 225 47.5 172.5 516 226 47.5 177.5 542 227 47.5 182.5 494 228 47.5 187.5 542 229 47.5 192.5 482 230 47.5 197.5 521 231 47.5 202.5 514 232 47.5 207.5 507 233 47.5 212.5 499 234 47.5 217.5 500 235 47.5 222.5 478 236 47.5 227.5 485 237 47.5 232.5 534 238 47.5 237.5 538 251 47.5 302.5 592 252 47.5 307.5 566 253 47.5 312.5 556 254 47.5 317.5 491 255 47.5 322.5 467 256 47.5 327.5 500 257 47.5 332.5 490 258 47.5 337.5 478 259 47.5 342.5 474 260 47.5 347.5 480 261 47.5 352.5 530 262 47.5 357.5 572 263 42.5 2.5 606 264 42.5 7.5 714 265 42.5 12.5 647 266 42.5 17.5 688 269 42.5 32.5 554 290 42.5 137.5 610 291 42.5 142.5 651 292 42.5 147.5 622 293 42.5 152.5 559 294 42.5 157.5 536 295 42.5 162.5 510 296 42.5 167.5 472 297 42.5 172.5 487 298 42.5 177.5 531 299 42.5 182.5 527 300 42.5 187.5 517 301 42.5 192.5 540 302 42.5 197.5 493 303 42.5 202.5 500 304 42.5 207.5 544 305 42.5 212.5 534 306 42.5 217.5 557 307 42.5 222.5 441 308 42.5 227.5 562 309 42.5 232.5 508 310 42.5 237.5 546 320 42.5 287.5 721 321 42.5 292.5 597 322 42.5 297.5 533 323 42.5 302.5 513 324 42.5 307.5 542 325 42.5 312.5 495 326 42.5 317.5 516 327 42.5 322.5 493 328 42.5 327.5 477 329 42.5 332.5 498 330 42.5 337.5 494 331 42.5 342.5 496 332 42.5 347.5 538 333 42.5 352.5 526 334 42.5 357.5 578 335 37.5 2.5 586 336 37.5 7.5 584 337 37.5 12.5 602 338 37.5 17.5 601 339 37.5 22.5 632 340 37.5 27.5 761 361 37.5 132.5 617 362 37.5 137.5 636 363 37.5 142.5 556 364 37.5 147.5 514 365 37.5 152.5 499 366 37.5 157.5 508 367 37.5 162.5 523 368 37.5 167.5 516 369 37.5 172.5 513 370 37.5 177.5 462 371 37.5 182.5 485 372 37.5 187.5 502 373 37.5 192.5 498 374 37.5 197.5 457 375 37.5 202.5 469 376 37.5 207.5 489 377 37.5 212.5 450 378 37.5 217.5 503 379 37.5 222.5 509 380 37.5 227.5 503 381 37.5 232.5 524 382 37.5 237.5 602 391 37.5 282.5 564 392 37.5 287.5 575 393 37.5 292.5 521 394 37.5 297.5 492 395 37.5 302.5 486 396 37.5 307.5 511 397 37.5 312.5 531 398 37.5 317.5 484 399 37.5 322.5 467 400 37.5 327.5 492 401 37.5 332.5 522 402 37.5 337.5 494 403 37.5 342.5 519 404 37.5 347.5 525 405 37.5 352.5 590 406 37.5 357.5 622 411 32.5 22.5 613 412 32.5 27.5 589 413 32.5 32.5 609 431 32.5 122.5 783 432 32.5 127.5 574 433 32.5 132.5 522 434 32.5 137.5 569 435 32.5 142.5 476 436 32.5 147.5 464 437 32.5 152.5 465 438 32.5 157.5 470 439 32.5 162.5 473 440 32.5 167.5 453 441 32.5 172.5 471 442 32.5 177.5 449 443 32.5 182.5 461 444 32.5 187.5 484 445 32.5 192.5 491 446 32.5 197.5 474 447 32.5 202.5 500 448 32.5 207.5 460 449 32.5 212.5 531 450 32.5 217.5 438 451 32.5 222.5 489 452 32.5 227.5 470 453 32.5 232.5 562 454 32.5 237.5 619 455 32.5 242.5 640 462 32.5 277.5 564 463 32.5 282.5 508 464 32.5 287.5 503 465 32.5 292.5 481 466 32.5 297.5 484 467 32.5 302.5 502 468 32.5 307.5 482 469 32.5 312.5 483 470 32.5 317.5 484 471 32.5 322.5 509 472 32.5 327.5 520 473 32.5 332.5 540 474 32.5 337.5 540 475 32.5 342.5 551 476 32.5 347.5 574 477 32.5 352.5 646 503 27.5 122.5 483 504 27.5 127.5 477 505 27.5 132.5 495 506 27.5 137.5 460 507 27.5 142.5 431 508 27.5 147.5 473 509 27.5 152.5 453 510 27.5 157.5 457 511 27.5 162.5 482 512 27.5 167.5 446 513 27.5 172.5 437 514 27.5 177.5 466 515 27.5 182.5 471 516 27.5 187.5 469 517 27.5 192.5 450 518 27.5 197.5 469 519 27.5 202.5 501 520 27.5 207.5 459 521 27.5 212.5 448 522 27.5 217.5 482 523 27.5 222.5 426 524 27.5 227.5 435 525 27.5 232.5 514 527 27.5 242.5 654 528 27.5 247.5 568 531 27.5 262.5 515 532 27.5 267.5 480 533 27.5 272.5 487 534 27.5 277.5 492 535 27.5 282.5 499 536 27.5 287.5 473 537 27.5 292.5 478 538 27.5 297.5 476 539 27.5 302.5 483 540 27.5 307.5 460 541 27.5 312.5 483 542 27.5 317.5 508 543 27.5 322.5 486 544 27.5 327.5 547 545 27.5 332.5 605 546 27.5 337.5 642 547 27.5 342.5 583 548 27.5 347.5 629 558 22.5 37.5 753 563 22.5 62.5 673 573 22.5 112.5 543 574 22.5 117.5 520 575 22.5 122.5 483 576 22.5 127.5 480 577 22.5 132.5 411 578 22.5 137.5 423 579 22.5 142.5 427 580 22.5 147.5 442 581 22.5 152.5 459 582 22.5 157.5 483 583 22.5 162.5 496 584 22.5 167.5 430 585 22.5 172.5 433 586 22.5 177.5 452 587 22.5 182.5 437 588 22.5 187.5 467 589 22.5 192.5 462 590 22.5 197.5 482 591 22.5 202.5 490 592 22.5 207.5 462 593 22.5 212.5 483 594 22.5 217.5 457 595 22.5 222.5 494 596 22.5 227.5 525 600 22.5 247.5 551 601 22.5 252.5 521 603 22.5 262.5 582 604 22.5 267.5 510 605 22.5 272.5 470 606 22.5 277.5 487 607 22.5 282.5 557 608 22.5 287.5 493 609 22.5 292.5 493 610 22.5 297.5 483 611 22.5 302.5 457 612 22.5 307.5 465 613 22.5 312.5 473 614 22.5 317.5 517 615 22.5 322.5 547 616 22.5 327.5 589 618 22.5 337.5 553 619 22.5 342.5 732 631 17.5 42.5 702 634 17.5 57.5 656 636 17.5 67.5 519 637 17.5 72.5 523 639 17.5 82.5 662 640 17.5 87.5 613 641 17.5 92.5 570 644 17.5 107.5 636 645 17.5 112.5 495 646 17.5 117.5 460 647 17.5 122.5 446 648 17.5 127.5 435 649 17.5 132.5 401 650 17.5 137.5 426 651 17.5 142.5 404 652 17.5 147.5 410 653 17.5 152.5 423 654 17.5 157.5 431 655 17.5 162.5 427 656 17.5 167.5 419 657 17.5 172.5 437 658 17.5 177.5 460 659 17.5 182.5 493 660 17.5 187.5 463 661 17.5 192.5 469 662 17.5 197.5 499 663 17.5 202.5 440 664 17.5 207.5 468 665 17.5 212.5 460 666 17.5 217.5 407 667 17.5 222.5 475 668 17.5 227.5 439 669 17.5 232.5 432 670 17.5 237.5 527 671 17.5 242.5 466 672 17.5 247.5 495 673 17.5 252.5 471 674 17.5 257.5 491 675 17.5 262.5 484 676 17.5 267.5 456 677 17.5 272.5 443 678 17.5 277.5 444 679 17.5 282.5 485 680 17.5 287.5 504 681 17.5 292.5 494 682 17.5 297.5 487 683 17.5 302.5 459 684 17.5 307.5 440 685 17.5 312.5 510 686 17.5 317.5 477 687 17.5 322.5 541 689 17.5 332.5 506 690 17.5 337.5 537 691 17.5 342.5 687 703 12.5 42.5 669 704 12.5 47.5 604 705 12.5 52.5 543 706 12.5 57.5 510 707 12.5 62.5 518 708 12.5 67.5 548 709 12.5 72.5 511 710 12.5 77.5 476 711 12.5 82.5 641 712 12.5 87.5 567 713 12.5 92.5 552 714 12.5 97.5 545 715 12.5 102.5 580 716 12.5 107.5 581 717 12.5 112.5 440 718 12.5 117.5 536 719 12.5 122.5 579 720 12.5 127.5 412 721 12.5 132.5 386 722 12.5 137.5 440 723 12.5 142.5 400 724 12.5 147.5 413 725 12.5 152.5 414 726 12.5 157.5 451 729 12.5 172.5 538 730 12.5 177.5 475 731 12.5 182.5 475 734 12.5 197.5 461 737 12.5 212.5 392 740 12.5 227.5 461 743 12.5 242.5 480 744 12.5 247.5 449 745 12.5 252.5 473 746 12.5 257.5 439 747 12.5 262.5 446 748 12.5 267.5 470 749 12.5 272.5 448 750 12.5 277.5 434 751 12.5 282.5 466 752 12.5 287.5 465 753 12.5 292.5 482 754 12.5 297.5 528 755 12.5 302.5 473 756 12.5 307.5 409 757 12.5 312.5 472 758 12.5 317.5 503 759 12.5 322.5 416 760 12.5 327.5 385 761 12.5 332.5 444 762 12.5 337.5 483 763 12.5 342.5 503 767 7.5 2.5 453 777 7.5 52.5 540 778 7.5 57.5 488 779 7.5 62.5 532 780 7.5 67.5 496 781 7.5 72.5 486 782 7.5 77.5 502 783 7.5 82.5 477 784 7.5 87.5 444 785 7.5 92.5 436 786 7.5 97.5 468 787 7.5 102.5 481 788 7.5 107.5 467 789 7.5 112.5 431 790 7.5 117.5 482 791 7.5 122.5 482 792 7.5 127.5 395 793 7.5 132.5 367 794 7.5 137.5 447 795 7.5 142.5 402 796 7.5 147.5 374 797 7.5 152.5 414 800 7.5 167.5 498 804 7.5 187.5 376 808 7.5 207.5 407 818 7.5 257.5 460 819 7.5 262.5 447 820 7.5 267.5 437 821 7.5 272.5 429 822 7.5 277.5 410 823 7.5 282.5 447 827 7.5 302.5 490 828 7.5 307.5 449 829 7.5 312.5 420 830 7.5 317.5 436 831 7.5 322.5 395 832 7.5 327.5 474 833 7.5 332.5 430 834 7.5 337.5 495 835 7.5 342.5 472 836 7.5 347.5 476 837 7.5 352.5 468 838 7.5 357.5 368 839 2.5 2.5 466 840 2.5 7.5 483 848 2.5 47.5 503 849 2.5 52.5 525 850 2.5 57.5 612 851 2.5 62.5 505 852 2.5 67.5 503 853 2.5 72.5 453 854 2.5 77.5 468 855 2.5 82.5 446 856 2.5 87.5 407 857 2.5 92.5 413 858 2.5 97.5 430 859 2.5 102.5 531 860 2.5 107.5 471 861 2.5 112.5 445 863 2.5 122.5 439 864 2.5 127.5 422 865 2.5 132.5 402 866 2.5 137.5 442 867 2.5 142.5 404 868 2.5 147.5 395 869 2.5 152.5 383 891 2.5 262.5 408 892 2.5 267.5 404 893 2.5 272.5 404 894 2.5 277.5 476 901 2.5 312.5 545 902 2.5 317.5 489 903 2.5 322.5 539 904 2.5 327.5 413 905 2.5 332.5 458 906 2.5 337.5 472 908 2.5 347.5 485 909 2.5 352.5 474 910 2.5 357.5 474 911 -2.5 2.5 572 912 -2.5 7.5 557 919 -2.5 42.5 501 920 -2.5 47.5 496 921 -2.5 52.5 483 922 -2.5 57.5 506 923 -2.5 62.5 392 924 -2.5 67.5 464 925 -2.5 72.5 414 926 -2.5 77.5 460 927 -2.5 82.5 422 928 -2.5 87.5 447 929 -2.5 92.5 458 930 -2.5 97.5 408 932 -2.5 107.5 436 934 -2.5 117.5 492 936 -2.5 127.5 422 939 -2.5 142.5 500 940 -2.5 147.5 402 941 -2.5 152.5 412 944 -2.5 167.5 439 964 -2.5 267.5 431 965 -2.5 272.5 443 966 -2.5 277.5 535 974 -2.5 317.5 628 975 -2.5 322.5 514 976 -2.5 327.5 501 977 -2.5 332.5 495 981 -2.5 352.5 533 982 -2.5 357.5 561 991 -7.5 42.5 471 992 -7.5 47.5 473 993 -7.5 52.5 423 997 -7.5 72.5 444 998 -7.5 77.5 390 999 -7.5 82.5 434 1000 -7.5 87.5 426 1001 -7.5 92.5 514 1002 -7.5 97.5 467 1003 -7.5 102.5 420 1004 -7.5 107.5 483 1005 -7.5 112.5 458 1006 -7.5 117.5 537 1007 -7.5 122.5 391 1008 -7.5 127.5 555 1012 -7.5 147.5 429 1013 -7.5 152.5 421 1014 -7.5 157.5 493 1020 -7.5 187.5 419 1035 -7.5 262.5 499 1038 -7.5 277.5 667 1048 -7.5 327.5 529 1049 -7.5 332.5 465 1053 -7.5 352.5 515 1054 -7.5 357.5 503 1055 -12.5 2.5 534 1063 -12.5 42.5 544 1065 -12.5 52.5 504 1068 -12.5 67.5 471 1069 -12.5 72.5 415 1071 -12.5 82.5 443 1072 -12.5 87.5 422 1073 -12.5 92.5 466 1074 -12.5 97.5 499 1076 -12.5 107.5 546 1083 -12.5 142.5 481 1084 -12.5 147.5 452 1085 -12.5 152.5 433 1086 -12.5 157.5 460 1087 -12.5 162.5 409 1088 -12.5 167.5 403 1089 -12.5 172.5 492 1091 -12.5 182.5 443 1092 -12.5 187.5 429 1093 -12.5 192.5 439 1098 -12.5 217.5 443 1099 -12.5 222.5 515 1105 -12.5 252.5 485 1106 -12.5 257.5 414 1119 -12.5 322.5 528 1120 -12.5 327.5 511 1123 -12.5 342.5 432 1124 -12.5 347.5 497 1125 -12.5 352.5 422 1126 -12.5 357.5 467 1127 -17.5 2.5 535 1128 -17.5 7.5 578 1129 -17.5 12.5 842 1134 -17.5 37.5 570 1135 -17.5 42.5 503 1137 -17.5 52.5 575 1138 -17.5 57.5 484 1139 -17.5 62.5 417 1143 -17.5 82.5 434 1144 -17.5 87.5 467 1145 -17.5 92.5 489 1146 -17.5 97.5 431 1156 -17.5 147.5 650 1157 -17.5 152.5 496 1159 -17.5 162.5 479 1161 -17.5 172.5 378 1162 -17.5 177.5 446 1163 -17.5 182.5 418 1164 -17.5 187.5 446 1165 -17.5 192.5 404 1166 -17.5 197.5 488 1167 -17.5 202.5 507 1168 -17.5 207.5 442 1169 -17.5 212.5 566 1176 -17.5 247.5 516 1191 -17.5 322.5 529 1196 -17.5 347.5 521 1197 -17.5 352.5 417 1198 -17.5 357.5 537 1199 -22.5 2.5 509 1200 -22.5 7.5 528 1206 -22.5 37.5 539 1209 -22.5 52.5 483 1210 -22.5 57.5 565 1213 -22.5 72.5 424 1214 -22.5 77.5 444 1215 -22.5 82.5 422 1217 -22.5 92.5 536 1218 -22.5 97.5 493 1219 -22.5 102.5 500 1221 -22.5 112.5 702 1229 -22.5 152.5 495 1231 -22.5 162.5 516 1232 -22.5 167.5 521 1233 -22.5 172.5 487 1234 -22.5 177.5 475 1235 -22.5 182.5 395 1236 -22.5 187.5 434 1246 -22.5 237.5 520 1262 -22.5 317.5 703 1263 -22.5 322.5 529 1269 -22.5 352.5 464 1270 -22.5 357.5 495 1271 -27.5 2.5 469 1272 -27.5 7.5 494 1273 -27.5 12.5 539 1277 -27.5 32.5 485 1278 -27.5 37.5 481 1279 -27.5 42.5 456 1280 -27.5 47.5 521 1290 -27.5 97.5 489 1292 -27.5 107.5 525 1293 -27.5 112.5 553 1301 -27.5 152.5 456 1302 -27.5 157.5 459 1303 -27.5 162.5 469 1304 -27.5 167.5 465 1305 -27.5 172.5 492 1306 -27.5 177.5 450 1307 -27.5 182.5 467 1308 -27.5 187.5 399 1333 -27.5 312.5 672 1342 -27.5 357.5 519 1343 -32.5 2.5 528 1344 -32.5 7.5 509 1345 -32.5 12.5 506 1346 -32.5 17.5 525 1347 -32.5 22.5 520 1348 -32.5 27.5 451 1349 -32.5 32.5 478 1350 -32.5 37.5 509 1362 -32.5 97.5 437 1364 -32.5 107.5 438 1365 -32.5 112.5 480 1366 -32.5 117.5 407 1373 -32.5 152.5 474 1374 -32.5 157.5 467 1375 -32.5 162.5 509 1376 -32.5 167.5 456 1377 -32.5 172.5 465 1378 -32.5 177.5 422 1379 -32.5 182.5 414 1380 -32.5 187.5 467 1381 -32.5 192.5 550 1404 -32.5 307.5 650 1414 -32.5 357.5 468 1419 -37.5 22.5 596 1438 -37.5 117.5 552 1439 -37.5 122.5 452 1440 -37.5 127.5 484 1441 -37.5 132.5 480 1442 -37.5 137.5 472 1443 -37.5 142.5 461 1444 -37.5 147.5 515 1445 -37.5 152.5 505 1446 -37.5 157.5 425 1447 -37.5 162.5 407 1448 -37.5 167.5 450 1449 -37.5 172.5 505 1450 -37.5 177.5 495 1451 -37.5 182.5 543 1452 -37.5 187.5 498 1470 -37.5 277.5 685 1519 -42.5 162.5 427 1521 -42.5 172.5 539 1522 -42.5 177.5 521 1546 -42.5 297.5 792 1592 -47.5 167.5 375 1661 -52.5 305.0 554 1663 -52.5 325.0 903 1714 -62.5 115.0 1232 1715 -62.5 125.0 721