Cumulonimbus Average Base Height (meters) December, January, February (1954 - 1997) Night, Ship Observations Only Global Average: 497 Zonal Averages 31 zones Lat.N Average 77.5 670 72.5 538 67.5 550 62.5 596 57.5 533 52.5 501 47.5 504 42.5 511 37.5 503 32.5 516 27.5 510 22.5 501 17.5 480 12.5 496 7.5 470 2.5 469 -2.5 465 -7.5 441 -12.5 457 -17.5 448 -22.5 480 -27.5 475 -32.5 486 -37.5 532 -42.5 590 -47.5 617 -52.5 598 -57.5 528 -62.5 644 -67.5 612 -72.5 598 Grid Box Averages 714 filled boxes Box # Lat.N Lon.E Average 11 77.5 10.0 670 29 72.5 10.0 524 30 72.5 30.0 564 31 72.5 50.0 524 47 67.5 5.0 500 48 67.5 15.0 525 50 67.5 35.0 553 81 67.5 345.0 626 82 67.5 355.0 653 83 62.5 5.0 512 115 62.5 325.0 533 117 62.5 345.0 696 118 62.5 355.0 647 119 57.5 5.0 573 120 57.5 15.0 592 133 57.5 145.0 593 134 57.5 155.0 603 136 57.5 175.0 487 137 57.5 185.0 551 138 57.5 195.0 535 139 57.5 205.0 498 140 57.5 215.0 534 141 57.5 225.0 579 149 57.5 305.0 578 150 57.5 315.0 563 151 57.5 325.0 544 152 57.5 335.0 483 153 57.5 345.0 474 154 57.5 355.0 539 155 52.5 5.0 611 170 52.5 155.0 641 171 52.5 165.0 438 172 52.5 175.0 504 173 52.5 185.0 513 174 52.5 195.0 515 175 52.5 205.0 557 176 52.5 215.0 570 177 52.5 225.0 484 185 52.5 305.0 550 186 52.5 315.0 450 187 52.5 325.0 482 188 52.5 335.0 480 189 52.5 345.0 479 190 52.5 355.0 557 219 47.5 142.5 663 220 47.5 147.5 605 221 47.5 152.5 530 222 47.5 157.5 493 223 47.5 162.5 456 224 47.5 167.5 440 225 47.5 172.5 476 226 47.5 177.5 409 227 47.5 182.5 560 228 47.5 187.5 492 229 47.5 192.5 464 230 47.5 197.5 577 231 47.5 202.5 499 232 47.5 207.5 479 233 47.5 212.5 529 234 47.5 217.5 523 235 47.5 222.5 494 236 47.5 227.5 525 237 47.5 232.5 596 238 47.5 237.5 628 251 47.5 302.5 559 252 47.5 307.5 506 253 47.5 312.5 540 254 47.5 317.5 481 255 47.5 322.5 443 256 47.5 327.5 489 257 47.5 332.5 499 258 47.5 337.5 477 259 47.5 342.5 501 260 47.5 347.5 481 261 47.5 352.5 523 262 47.5 357.5 529 263 42.5 2.5 613 264 42.5 7.5 707 265 42.5 12.5 610 266 42.5 17.5 605 268 42.5 27.5 705 269 42.5 32.5 650 290 42.5 137.5 617 291 42.5 142.5 616 292 42.5 147.5 553 293 42.5 152.5 460 294 42.5 157.5 446 295 42.5 162.5 478 296 42.5 167.5 512 297 42.5 172.5 539 298 42.5 177.5 495 299 42.5 182.5 498 300 42.5 187.5 522 301 42.5 192.5 552 302 42.5 197.5 516 303 42.5 202.5 492 304 42.5 207.5 519 305 42.5 212.5 443 306 42.5 217.5 498 307 42.5 222.5 514 308 42.5 227.5 496 309 42.5 232.5 519 310 42.5 237.5 536 320 42.5 287.5 600 321 42.5 292.5 585 322 42.5 297.5 518 323 42.5 302.5 452 324 42.5 307.5 488 325 42.5 312.5 476 326 42.5 317.5 476 327 42.5 322.5 477 328 42.5 327.5 456 329 42.5 332.5 473 330 42.5 337.5 469 331 42.5 342.5 497 332 42.5 347.5 518 333 42.5 352.5 513 335 37.5 2.5 578 336 37.5 7.5 554 337 37.5 12.5 601 338 37.5 17.5 578 339 37.5 22.5 592 340 37.5 27.5 604 361 37.5 132.5 615 362 37.5 137.5 609 363 37.5 142.5 600 364 37.5 147.5 518 365 37.5 152.5 453 366 37.5 157.5 431 367 37.5 162.5 445 368 37.5 167.5 453 369 37.5 172.5 455 370 37.5 177.5 458 371 37.5 182.5 486 372 37.5 187.5 500 373 37.5 192.5 485 374 37.5 197.5 473 375 37.5 202.5 474 376 37.5 207.5 465 377 37.5 212.5 503 378 37.5 217.5 494 379 37.5 222.5 485 380 37.5 227.5 503 381 37.5 232.5 554 382 37.5 237.5 516 392 37.5 287.5 587 393 37.5 292.5 505 394 37.5 297.5 501 395 37.5 302.5 464 396 37.5 307.5 461 397 37.5 312.5 506 398 37.5 317.5 471 399 37.5 322.5 470 400 37.5 327.5 488 401 37.5 332.5 506 402 37.5 337.5 508 403 37.5 342.5 573 404 37.5 347.5 530 405 37.5 352.5 570 406 37.5 357.5 597 410 32.5 17.5 547 411 32.5 22.5 500 412 32.5 27.5 543 413 32.5 32.5 631 431 32.5 122.5 866 432 32.5 127.5 551 433 32.5 132.5 549 434 32.5 137.5 527 435 32.5 142.5 487 436 32.5 147.5 482 437 32.5 152.5 490 438 32.5 157.5 473 439 32.5 162.5 520 440 32.5 167.5 470 441 32.5 172.5 487 442 32.5 177.5 496 443 32.5 182.5 497 444 32.5 187.5 486 445 32.5 192.5 442 446 32.5 197.5 502 447 32.5 202.5 513 448 32.5 207.5 487 449 32.5 212.5 492 450 32.5 217.5 504 451 32.5 222.5 461 452 32.5 227.5 467 453 32.5 232.5 506 454 32.5 237.5 483 455 32.5 242.5 528 462 32.5 277.5 617 463 32.5 282.5 534 464 32.5 287.5 534 465 32.5 292.5 534 466 32.5 297.5 527 467 32.5 302.5 481 468 32.5 307.5 507 469 32.5 312.5 493 470 32.5 317.5 522 471 32.5 322.5 490 472 32.5 327.5 521 473 32.5 332.5 571 474 32.5 337.5 575 475 32.5 342.5 569 476 32.5 347.5 573 477 32.5 352.5 638 489 27.5 52.5 782 503 27.5 122.5 535 504 27.5 127.5 508 505 27.5 132.5 531 506 27.5 137.5 460 507 27.5 142.5 472 508 27.5 147.5 585 509 27.5 152.5 509 510 27.5 157.5 506 511 27.5 162.5 475 512 27.5 167.5 480 513 27.5 172.5 471 514 27.5 177.5 516 515 27.5 182.5 491 516 27.5 187.5 479 517 27.5 192.5 477 518 27.5 197.5 449 519 27.5 202.5 462 520 27.5 207.5 466 521 27.5 212.5 459 522 27.5 217.5 497 523 27.5 222.5 480 524 27.5 227.5 472 525 27.5 232.5 498 527 27.5 242.5 566 528 27.5 247.5 603 532 27.5 267.5 500 533 27.5 272.5 508 534 27.5 277.5 530 535 27.5 282.5 517 536 27.5 287.5 513 537 27.5 292.5 506 538 27.5 297.5 544 539 27.5 302.5 497 540 27.5 307.5 522 541 27.5 312.5 501 542 27.5 317.5 511 543 27.5 322.5 510 544 27.5 327.5 572 545 27.5 332.5 607 546 27.5 337.5 579 547 27.5 342.5 586 548 27.5 347.5 572 558 22.5 37.5 703 562 22.5 57.5 731 563 22.5 62.5 639 573 22.5 112.5 613 574 22.5 117.5 535 575 22.5 122.5 492 576 22.5 127.5 526 577 22.5 132.5 477 578 22.5 137.5 473 579 22.5 142.5 478 580 22.5 147.5 491 581 22.5 152.5 485 582 22.5 157.5 508 583 22.5 162.5 509 584 22.5 167.5 525 585 22.5 172.5 496 586 22.5 177.5 454 587 22.5 182.5 462 588 22.5 187.5 456 589 22.5 192.5 496 590 22.5 197.5 482 591 22.5 202.5 501 592 22.5 207.5 500 593 22.5 212.5 480 594 22.5 217.5 462 595 22.5 222.5 474 596 22.5 227.5 532 600 22.5 247.5 610 601 22.5 252.5 703 604 22.5 267.5 564 605 22.5 272.5 491 606 22.5 277.5 506 607 22.5 282.5 534 608 22.5 287.5 511 609 22.5 292.5 515 610 22.5 297.5 522 611 22.5 302.5 488 612 22.5 307.5 519 613 22.5 312.5 521 614 22.5 317.5 519 615 22.5 322.5 484 616 22.5 327.5 492 618 22.5 337.5 452 619 22.5 342.5 707 630 17.5 37.5 608 631 17.5 42.5 634 634 17.5 57.5 645 644 17.5 107.5 626 645 17.5 112.5 526 646 17.5 117.5 516 647 17.5 122.5 520 648 17.5 127.5 485 649 17.5 132.5 445 650 17.5 137.5 445 651 17.5 142.5 434 652 17.5 147.5 450 653 17.5 152.5 460 654 17.5 157.5 451 655 17.5 162.5 473 656 17.5 167.5 488 657 17.5 172.5 438 658 17.5 177.5 430 659 17.5 182.5 417 660 17.5 187.5 433 661 17.5 192.5 438 662 17.5 197.5 449 663 17.5 202.5 457 664 17.5 207.5 474 665 17.5 212.5 459 666 17.5 217.5 439 667 17.5 222.5 436 668 17.5 227.5 527 669 17.5 232.5 473 670 17.5 237.5 488 671 17.5 242.5 496 672 17.5 247.5 585 673 17.5 252.5 607 674 17.5 257.5 621 675 17.5 262.5 570 677 17.5 272.5 450 678 17.5 277.5 479 679 17.5 282.5 487 680 17.5 287.5 514 681 17.5 292.5 514 682 17.5 297.5 495 683 17.5 302.5 493 684 17.5 307.5 483 685 17.5 312.5 549 686 17.5 317.5 475 687 17.5 322.5 560 690 17.5 337.5 640 691 17.5 342.5 782 703 12.5 42.5 642 704 12.5 47.5 618 705 12.5 52.5 586 706 12.5 57.5 592 707 12.5 62.5 617 709 12.5 72.5 479 711 12.5 82.5 707 712 12.5 87.5 629 713 12.5 92.5 533 715 12.5 102.5 517 716 12.5 107.5 654 717 12.5 112.5 487 718 12.5 117.5 499 720 12.5 127.5 454 721 12.5 132.5 420 722 12.5 137.5 415 723 12.5 142.5 420 724 12.5 147.5 436 725 12.5 152.5 448 737 12.5 212.5 461 744 12.5 247.5 448 745 12.5 252.5 456 746 12.5 257.5 569 747 12.5 262.5 511 748 12.5 267.5 535 749 12.5 272.5 569 750 12.5 277.5 451 751 12.5 282.5 477 752 12.5 287.5 501 753 12.5 292.5 498 754 12.5 297.5 517 755 12.5 302.5 503 756 12.5 307.5 506 757 12.5 312.5 509 761 12.5 332.5 554 762 12.5 337.5 651 763 12.5 342.5 676 767 7.5 2.5 513 777 7.5 52.5 530 778 7.5 57.5 518 779 7.5 62.5 639 780 7.5 67.5 573 781 7.5 72.5 494 782 7.5 77.5 526 783 7.5 82.5 525 784 7.5 87.5 467 785 7.5 92.5 465 786 7.5 97.5 482 787 7.5 102.5 507 788 7.5 107.5 473 789 7.5 112.5 487 790 7.5 117.5 454 791 7.5 122.5 467 792 7.5 127.5 443 793 7.5 132.5 424 794 7.5 137.5 454 795 7.5 142.5 426 796 7.5 147.5 388 797 7.5 152.5 427 798 7.5 157.5 481 804 7.5 187.5 443 808 7.5 207.5 373 819 7.5 262.5 525 820 7.5 267.5 504 821 7.5 272.5 497 822 7.5 277.5 485 823 7.5 282.5 536 827 7.5 302.5 518 828 7.5 307.5 461 829 7.5 312.5 434 830 7.5 317.5 477 831 7.5 322.5 487 833 7.5 332.5 505 835 7.5 342.5 566 836 7.5 347.5 527 838 7.5 357.5 507 839 2.5 2.5 490 840 2.5 7.5 450 848 2.5 47.5 519 849 2.5 52.5 513 851 2.5 62.5 484 852 2.5 67.5 476 854 2.5 77.5 493 855 2.5 82.5 462 856 2.5 87.5 427 857 2.5 92.5 443 858 2.5 97.5 479 859 2.5 102.5 562 860 2.5 107.5 492 861 2.5 112.5 542 863 2.5 122.5 540 864 2.5 127.5 465 865 2.5 132.5 505 866 2.5 137.5 422 867 2.5 142.5 441 868 2.5 147.5 445 869 2.5 152.5 401 870 2.5 157.5 458 891 2.5 262.5 415 892 2.5 267.5 384 893 2.5 272.5 413 894 2.5 277.5 441 901 2.5 312.5 510 902 2.5 317.5 449 903 2.5 322.5 489 904 2.5 327.5 435 905 2.5 332.5 467 906 2.5 337.5 511 907 2.5 342.5 509 908 2.5 347.5 505 909 2.5 352.5 513 910 2.5 357.5 525 911 -2.5 2.5 519 912 -2.5 7.5 494 920 -2.5 47.5 489 921 -2.5 52.5 459 924 -2.5 67.5 434 925 -2.5 72.5 454 926 -2.5 77.5 500 927 -2.5 82.5 432 928 -2.5 87.5 446 929 -2.5 92.5 460 930 -2.5 97.5 470 932 -2.5 107.5 432 934 -2.5 117.5 471 936 -2.5 127.5 456 939 -2.5 142.5 413 940 -2.5 147.5 412 941 -2.5 152.5 442 944 -2.5 167.5 451 964 -2.5 267.5 413 965 -2.5 272.5 449 966 -2.5 277.5 499 974 -2.5 317.5 570 975 -2.5 322.5 516 976 -2.5 327.5 464 977 -2.5 332.5 527 981 -2.5 352.5 499 982 -2.5 357.5 554 983 -7.5 2.5 570 984 -7.5 7.5 617 985 -7.5 12.5 633 991 -7.5 42.5 490 992 -7.5 47.5 484 993 -7.5 52.5 510 994 -7.5 57.5 445 995 -7.5 62.5 344 996 -7.5 67.5 444 997 -7.5 72.5 444 998 -7.5 77.5 426 999 -7.5 82.5 403 1000 -7.5 87.5 412 1001 -7.5 92.5 435 1002 -7.5 97.5 409 1003 -7.5 102.5 455 1004 -7.5 107.5 538 1005 -7.5 112.5 460 1006 -7.5 117.5 400 1007 -7.5 122.5 424 1008 -7.5 127.5 406 1009 -7.5 132.5 403 1010 -7.5 137.5 472 1012 -7.5 147.5 413 1013 -7.5 152.5 427 1014 -7.5 157.5 386 1020 -7.5 187.5 413 1021 -7.5 192.5 401 1035 -7.5 262.5 483 1036 -7.5 267.5 488 1038 -7.5 277.5 541 1048 -7.5 327.5 540 1049 -7.5 332.5 453 1053 -7.5 352.5 467 1054 -7.5 357.5 522 1055 -12.5 2.5 505 1056 -12.5 7.5 624 1063 -12.5 42.5 514 1064 -12.5 47.5 572 1065 -12.5 52.5 475 1067 -12.5 62.5 444 1068 -12.5 67.5 379 1069 -12.5 72.5 389 1071 -12.5 82.5 453 1072 -12.5 87.5 397 1073 -12.5 92.5 446 1074 -12.5 97.5 464 1076 -12.5 107.5 439 1079 -12.5 122.5 484 1080 -12.5 127.5 574 1082 -12.5 137.5 457 1083 -12.5 142.5 413 1084 -12.5 147.5 456 1085 -12.5 152.5 432 1086 -12.5 157.5 423 1087 -12.5 162.5 448 1088 -12.5 167.5 413 1089 -12.5 172.5 469 1090 -12.5 177.5 496 1091 -12.5 182.5 438 1092 -12.5 187.5 432 1093 -12.5 192.5 403 1094 -12.5 197.5 451 1097 -12.5 212.5 442 1098 -12.5 217.5 449 1099 -12.5 222.5 451 1106 -12.5 257.5 502 1111 -12.5 282.5 686 1119 -12.5 322.5 536 1120 -12.5 327.5 551 1122 -12.5 337.5 509 1123 -12.5 342.5 443 1125 -12.5 352.5 474 1126 -12.5 357.5 532 1127 -17.5 2.5 488 1128 -17.5 7.5 521 1129 -17.5 12.5 779 1134 -17.5 37.5 499 1135 -17.5 42.5 460 1137 -17.5 52.5 463 1138 -17.5 57.5 438 1139 -17.5 62.5 429 1142 -17.5 77.5 358 1143 -17.5 82.5 388 1144 -17.5 87.5 402 1145 -17.5 92.5 437 1146 -17.5 97.5 457 1147 -17.5 102.5 538 1148 -17.5 107.5 482 1156 -17.5 147.5 495 1157 -17.5 152.5 443 1158 -17.5 157.5 375 1159 -17.5 162.5 489 1160 -17.5 167.5 417 1161 -17.5 172.5 406 1162 -17.5 177.5 396 1163 -17.5 182.5 451 1164 -17.5 187.5 413 1165 -17.5 192.5 430 1166 -17.5 197.5 463 1167 -17.5 202.5 440 1168 -17.5 207.5 481 1169 -17.5 212.5 486 1170 -17.5 217.5 483 1175 -17.5 242.5 470 1176 -17.5 247.5 475 1183 -17.5 282.5 543 1191 -17.5 322.5 557 1195 -17.5 342.5 462 1196 -17.5 347.5 402 1197 -17.5 352.5 445 1198 -17.5 357.5 486 1199 -22.5 2.5 488 1200 -22.5 7.5 556 1201 -22.5 12.5 672 1206 -22.5 37.5 443 1208 -22.5 47.5 437 1209 -22.5 52.5 450 1210 -22.5 57.5 475 1215 -22.5 82.5 464 1217 -22.5 92.5 529 1218 -22.5 97.5 494 1219 -22.5 102.5 519 1220 -22.5 107.5 538 1221 -22.5 112.5 517 1229 -22.5 152.5 471 1231 -22.5 162.5 479 1232 -22.5 167.5 500 1233 -22.5 172.5 453 1234 -22.5 177.5 430 1235 -22.5 182.5 430 1236 -22.5 187.5 445 1237 -22.5 192.5 438 1238 -22.5 197.5 420 1243 -22.5 222.5 592 1245 -22.5 232.5 451 1246 -22.5 237.5 511 1262 -22.5 317.5 648 1263 -22.5 322.5 526 1269 -22.5 352.5 448 1270 -22.5 357.5 501 1271 -27.5 2.5 500 1272 -27.5 7.5 544 1273 -27.5 12.5 541 1277 -27.5 32.5 485 1278 -27.5 37.5 457 1279 -27.5 42.5 501 1280 -27.5 47.5 461 1284 -27.5 67.5 478 1285 -27.5 72.5 508 1287 -27.5 82.5 475 1291 -27.5 102.5 540 1292 -27.5 107.5 499 1293 -27.5 112.5 616 1301 -27.5 152.5 473 1302 -27.5 157.5 449 1303 -27.5 162.5 459 1304 -27.5 167.5 464 1305 -27.5 172.5 431 1306 -27.5 177.5 415 1307 -27.5 182.5 380 1308 -27.5 187.5 429 1309 -27.5 192.5 453 1333 -27.5 312.5 563 1334 -27.5 317.5 603 1342 -27.5 357.5 448 1343 -32.5 2.5 571 1344 -32.5 7.5 475 1345 -32.5 12.5 508 1346 -32.5 17.5 534 1347 -32.5 22.5 541 1348 -32.5 27.5 502 1349 -32.5 32.5 487 1350 -32.5 37.5 495 1360 -32.5 87.5 452 1364 -32.5 107.5 479 1365 -32.5 112.5 554 1373 -32.5 152.5 511 1374 -32.5 157.5 514 1375 -32.5 162.5 517 1376 -32.5 167.5 439 1377 -32.5 172.5 470 1378 -32.5 177.5 412 1379 -32.5 182.5 478 1380 -32.5 187.5 450 1381 -32.5 192.5 477 1382 -32.5 197.5 516 1383 -32.5 202.5 426 1404 -32.5 307.5 576 1414 -32.5 357.5 505 1418 -37.5 17.5 606 1419 -37.5 22.5 625 1438 -37.5 117.5 455 1439 -37.5 122.5 528 1440 -37.5 127.5 532 1441 -37.5 132.5 533 1442 -37.5 137.5 556 1444 -37.5 147.5 519 1445 -37.5 152.5 482 1446 -37.5 157.5 503 1447 -37.5 162.5 434 1448 -37.5 167.5 497 1449 -37.5 172.5 504 1450 -37.5 177.5 507 1451 -37.5 182.5 438 1452 -37.5 187.5 476 1453 -37.5 192.5 451 1469 -37.5 272.5 682 1470 -37.5 277.5 701 1471 -37.5 282.5 696 1475 -37.5 302.5 756 1520 -42.5 167.5 534 1521 -42.5 172.5 535 1522 -42.5 177.5 525 1542 -42.5 277.5 601 1546 -42.5 297.5 771 1592 -47.5 167.5 492 1618 -47.5 297.5 714 1647 -52.5 165.0 601 1660 -52.5 295.0 642 1661 -52.5 305.0 536 1662 -52.5 315.0 676 1663 -52.5 325.0 548 1696 -57.5 295.0 528 1714 -62.5 115.0 820 1732 -62.5 295.0 491 1733 -62.5 305.0 512 1734 -62.5 315.0 549 1742 -67.5 35.0 425 1743 -67.5 45.0 479 1745 -67.5 65.0 520 1746 -67.5 75.0 554 1757 -67.5 185.0 594 1758 -67.5 195.0 676 1783 -72.5 170.0 598