Nimbostratus Frequency of Occurrence (%) September, October, November (1954 - 1997) Night, Ship Observations Only Global Average: 5.7 Zonal Averages 34 zones Lat.N Average 87.5 23.4 82.5 19.9 77.5 17.7 72.5 13.9 67.5 11.8 62.5 12.6 57.5 11.5 52.5 9.5 47.5 8.1 42.5 6.1 37.5 4.1 32.5 2.7 27.5 1.7 22.5 1.5 17.5 1.8 12.5 2.7 7.5 4.5 2.5 2.3 -2.5 1.6 -7.5 1.8 -12.5 1.7 -17.5 1.7 -22.5 2.2 -27.5 2.8 -32.5 4.3 -37.5 5.5 -42.5 8.1 -47.5 7.1 -52.5 9.8 -57.5 14.4 -62.5 21.6 -67.5 19.6 -72.5 19.1 -77.5 10.5 Grid Box Averages 1216 filled boxes Box # Lat.N Lon.E Average 1 87.5 0.0 23.4 2 82.5 20.0 10.5 3 82.5 60.0 10.8 4 82.5 100.0 24.5 5 82.5 140.0 23.7 6 82.5 180.0 23.3 7 82.5 220.0 23.1 8 82.5 260.0 24.3 9 82.5 300.0 26.0 10 82.5 340.0 14.0 11 77.5 10.0 10.4 12 77.5 30.0 10.2 13 77.5 50.0 12.8 14 77.5 70.0 10.9 15 77.5 90.0 13.1 16 77.5 110.0 14.0 17 77.5 130.0 16.4 18 77.5 150.0 27.3 19 77.5 170.0 21.4 20 77.5 190.0 28.2 21 77.5 210.0 20.0 22 77.5 230.0 26.5 23 77.5 250.0 17.6 24 77.5 270.0 19.0 25 77.5 290.0 10.4 28 77.5 350.0 17.0 29 72.5 10.0 8.4 30 72.5 30.0 10.7 31 72.5 50.0 12.9 32 72.5 70.0 11.8 33 72.5 90.0 13.3 35 72.5 130.0 15.8 36 72.5 150.0 16.6 37 72.5 170.0 17.7 38 72.5 190.0 18.3 39 72.5 210.0 19.0 41 72.5 250.0 13.3 42 72.5 270.0 18.4 43 72.5 290.0 14.3 44 72.5 310.0 6.2 45 72.5 330.0 9.2 46 72.5 350.0 10.1 47 67.5 5.0 12.1 48 67.5 15.0 9.6 50 67.5 35.0 10.6 51 67.5 45.0 10.9 52 67.5 55.0 11.5 53 67.5 65.0 16.1 65 67.5 185.0 13.4 66 67.5 195.0 14.7 71 67.5 245.0 9.9 72 67.5 255.0 10.3 73 67.5 265.0 12.8 74 67.5 275.0 14.3 75 67.5 285.0 17.1 76 67.5 295.0 14.4 77 67.5 305.0 11.4 79 67.5 325.0 12.8 81 67.5 345.0 8.8 82 67.5 355.0 9.1 83 62.5 5.0 11.6 98 62.5 155.0 11.1 99 62.5 165.0 15.6 100 62.5 175.0 11.6 101 62.5 185.0 14.6 102 62.5 195.0 10.4 104 62.5 215.0 15.1 109 62.5 265.0 10.2 110 62.5 275.0 11.4 111 62.5 285.0 15.5 112 62.5 295.0 17.6 113 62.5 305.0 12.7 114 62.5 315.0 14.0 115 62.5 325.0 15.4 116 62.5 335.0 12.2 117 62.5 345.0 9.9 118 62.5 355.0 9.6 119 57.5 5.0 8.4 120 57.5 15.0 4.3 121 57.5 25.0 5.6 133 57.5 145.0 15.7 134 57.5 155.0 16.9 135 57.5 165.0 9.9 136 57.5 175.0 9.9 137 57.5 185.0 13.6 138 57.5 195.0 12.0 139 57.5 205.0 11.9 140 57.5 215.0 10.9 141 57.5 225.0 14.4 145 57.5 265.0 13.0 146 57.5 275.0 9.8 147 57.5 285.0 18.1 148 57.5 295.0 15.7 149 57.5 305.0 15.0 150 57.5 315.0 9.9 151 57.5 325.0 9.4 152 57.5 335.0 10.3 153 57.5 345.0 11.3 154 57.5 355.0 9.7 155 52.5 5.0 5.8 156 52.5 15.0 4.3 169 52.5 145.0 10.7 170 52.5 155.0 11.9 171 52.5 165.0 8.0 172 52.5 175.0 10.0 173 52.5 185.0 9.7 174 52.5 195.0 8.9 175 52.5 205.0 10.0 176 52.5 215.0 11.1 177 52.5 225.0 9.9 178 52.5 235.0 12.9 185 52.5 305.0 10.3 186 52.5 315.0 10.1 187 52.5 325.0 9.8 188 52.5 335.0 8.6 189 52.5 345.0 7.8 190 52.5 355.0 6.2 191 47.5 2.5 2.9 193 47.5 12.5 3.5 197 47.5 32.5 4.2 218 47.5 137.5 4.7 219 47.5 142.5 9.9 220 47.5 147.5 10.3 221 47.5 152.5 10.6 222 47.5 157.5 9.6 223 47.5 162.5 8.9 224 47.5 167.5 9.6 225 47.5 172.5 9.6 226 47.5 177.5 8.3 227 47.5 182.5 9.6 228 47.5 187.5 8.4 229 47.5 192.5 8.6 230 47.5 197.5 9.4 231 47.5 202.5 8.6 232 47.5 207.5 8.4 233 47.5 212.5 8.7 234 47.5 217.5 11.3 235 47.5 222.5 8.5 236 47.5 227.5 7.9 237 47.5 232.5 7.7 238 47.5 237.5 7.5 251 47.5 302.5 7.1 252 47.5 307.5 8.3 253 47.5 312.5 10.0 254 47.5 317.5 7.4 255 47.5 322.5 6.8 256 47.5 327.5 5.8 257 47.5 332.5 6.4 258 47.5 337.5 6.0 259 47.5 342.5 6.4 260 47.5 347.5 5.1 261 47.5 352.5 4.8 262 47.5 357.5 4.9 263 42.5 2.5 1.7 264 42.5 7.5 2.0 265 42.5 12.5 2.0 266 42.5 17.5 2.3 267 42.5 22.5 2.4 268 42.5 27.5 2.2 269 42.5 32.5 2.1 270 42.5 37.5 2.4 272 42.5 47.5 2.3 273 42.5 52.5 1.1 289 42.5 132.5 5.4 290 42.5 137.5 4.2 291 42.5 142.5 7.0 292 42.5 147.5 10.9 293 42.5 152.5 9.2 294 42.5 157.5 8.9 295 42.5 162.5 9.4 296 42.5 167.5 8.6 297 42.5 172.5 7.8 298 42.5 177.5 7.8 299 42.5 182.5 8.6 300 42.5 187.5 8.9 301 42.5 192.5 9.3 302 42.5 197.5 7.5 303 42.5 202.5 8.3 304 42.5 207.5 7.8 305 42.5 212.5 7.6 306 42.5 217.5 6.6 307 42.5 222.5 5.8 308 42.5 227.5 5.1 309 42.5 232.5 4.8 310 42.5 237.5 4.3 320 42.5 287.5 4.8 321 42.5 292.5 5.0 322 42.5 297.5 5.4 323 42.5 302.5 6.1 324 42.5 307.5 5.3 325 42.5 312.5 4.9 326 42.5 317.5 6.4 327 42.5 322.5 4.8 328 42.5 327.5 4.5 329 42.5 332.5 4.3 330 42.5 337.5 4.4 331 42.5 342.5 4.2 332 42.5 347.5 3.0 333 42.5 352.5 3.4 334 42.5 357.5 3.3 335 37.5 2.5 1.5 336 37.5 7.5 1.8 337 37.5 12.5 1.2 338 37.5 17.5 1.4 339 37.5 22.5 1.2 340 37.5 27.5 0.7 341 37.5 32.5 0.7 345 37.5 52.5 1.3 358 37.5 117.5 3.3 359 37.5 122.5 2.8 360 37.5 127.5 3.8 361 37.5 132.5 4.5 362 37.5 137.5 6.3 363 37.5 142.5 7.7 364 37.5 147.5 7.6 365 37.5 152.5 8.0 366 37.5 157.5 7.0 367 37.5 162.5 7.7 368 37.5 167.5 6.8 369 37.5 172.5 6.7 370 37.5 177.5 5.8 371 37.5 182.5 6.3 372 37.5 187.5 7.1 373 37.5 192.5 6.8 374 37.5 197.5 6.7 375 37.5 202.5 5.2 376 37.5 207.5 5.1 377 37.5 212.5 4.5 378 37.5 217.5 3.3 379 37.5 222.5 3.1 380 37.5 227.5 2.8 381 37.5 232.5 2.1 382 37.5 237.5 1.6 391 37.5 282.5 2.4 392 37.5 287.5 2.9 393 37.5 292.5 3.4 394 37.5 297.5 3.7 395 37.5 302.5 3.5 396 37.5 307.5 3.1 397 37.5 312.5 2.6 398 37.5 317.5 3.2 399 37.5 322.5 3.4 400 37.5 327.5 2.8 401 37.5 332.5 2.2 402 37.5 337.5 2.5 403 37.5 342.5 2.2 404 37.5 347.5 1.6 405 37.5 352.5 1.5 406 37.5 357.5 1.3 409 32.5 12.5 1.1 410 32.5 17.5 0.8 411 32.5 22.5 0.7 412 32.5 27.5 0.4 413 32.5 32.5 0.4 414 32.5 37.5 0.9 431 32.5 122.5 6.0 432 32.5 127.5 4.4 433 32.5 132.5 4.6 434 32.5 137.5 6.4 435 32.5 142.5 5.6 436 32.5 147.5 5.5 437 32.5 152.5 5.1 438 32.5 157.5 5.0 439 32.5 162.5 4.4 440 32.5 167.5 3.7 441 32.5 172.5 3.9 442 32.5 177.5 3.2 443 32.5 182.5 4.1 444 32.5 187.5 4.2 445 32.5 192.5 3.2 446 32.5 197.5 3.4 447 32.5 202.5 3.1 448 32.5 207.5 3.4 449 32.5 212.5 1.9 450 32.5 217.5 2.4 451 32.5 222.5 1.6 452 32.5 227.5 1.8 453 32.5 232.5 1.1 454 32.5 237.5 0.6 455 32.5 242.5 0.8 461 32.5 272.5 1.2 462 32.5 277.5 1.5 463 32.5 282.5 1.7 464 32.5 287.5 2.2 465 32.5 292.5 1.8 466 32.5 297.5 1.8 467 32.5 302.5 2.3 468 32.5 307.5 2.1 469 32.5 312.5 2.0 470 32.5 317.5 2.1 471 32.5 322.5 1.7 472 32.5 327.5 2.3 473 32.5 332.5 1.8 474 32.5 337.5 1.3 475 32.5 342.5 1.5 476 32.5 347.5 0.9 477 32.5 352.5 0.8 485 27.5 32.5 0.0 486 27.5 37.5 0.1 488 27.5 47.5 0.0 489 27.5 52.5 0.2 490 27.5 57.5 0.0 503 27.5 122.5 5.0 504 27.5 127.5 4.2 505 27.5 132.5 3.8 506 27.5 137.5 3.4 507 27.5 142.5 3.4 508 27.5 147.5 2.5 509 27.5 152.5 2.5 510 27.5 157.5 2.2 511 27.5 162.5 1.5 512 27.5 167.5 1.0 513 27.5 172.5 1.6 514 27.5 177.5 2.1 515 27.5 182.5 1.9 516 27.5 187.5 2.1 517 27.5 192.5 2.0 518 27.5 197.5 2.9 519 27.5 202.5 1.9 520 27.5 207.5 1.3 521 27.5 212.5 1.5 522 27.5 217.5 1.1 523 27.5 222.5 1.2 524 27.5 227.5 1.2 525 27.5 232.5 0.8 526 27.5 237.5 0.4 527 27.5 242.5 0.4 528 27.5 247.5 0.5 531 27.5 262.5 1.0 532 27.5 267.5 1.4 533 27.5 272.5 1.2 534 27.5 277.5 1.0 535 27.5 282.5 1.3 536 27.5 287.5 1.4 537 27.5 292.5 1.7 538 27.5 297.5 1.6 539 27.5 302.5 1.5 540 27.5 307.5 1.8 541 27.5 312.5 1.6 542 27.5 317.5 1.3 543 27.5 322.5 0.8 544 27.5 327.5 1.5 545 27.5 332.5 0.8 546 27.5 337.5 0.9 547 27.5 342.5 0.5 548 27.5 347.5 0.8 558 22.5 37.5 0.1 561 22.5 52.5 0.0 562 22.5 57.5 0.1 563 22.5 62.5 0.1 564 22.5 67.5 0.1 565 22.5 72.5 0.8 568 22.5 87.5 5.3 569 22.5 92.5 7.1 572 22.5 107.5 4.5 573 22.5 112.5 2.6 574 22.5 117.5 3.2 575 22.5 122.5 4.1 576 22.5 127.5 3.6 577 22.5 132.5 3.1 578 22.5 137.5 2.4 579 22.5 142.5 2.1 580 22.5 147.5 2.7 581 22.5 152.5 1.5 582 22.5 157.5 0.8 583 22.5 162.5 0.8 584 22.5 167.5 2.0 585 22.5 172.5 1.4 586 22.5 177.5 2.3 587 22.5 182.5 1.7 588 22.5 187.5 1.5 589 22.5 192.5 1.5 590 22.5 197.5 1.1 591 22.5 202.5 0.7 592 22.5 207.5 1.0 593 22.5 212.5 1.0 594 22.5 217.5 1.3 595 22.5 222.5 1.7 596 22.5 227.5 1.5 597 22.5 232.5 1.6 598 22.5 237.5 1.0 599 22.5 242.5 0.9 600 22.5 247.5 0.3 601 22.5 252.5 0.9 603 22.5 262.5 3.1 604 22.5 267.5 1.6 605 22.5 272.5 1.1 606 22.5 277.5 1.4 607 22.5 282.5 0.6 608 22.5 287.5 0.9 609 22.5 292.5 1.0 610 22.5 297.5 1.4 611 22.5 302.5 1.3 612 22.5 307.5 1.1 613 22.5 312.5 1.3 614 22.5 317.5 0.8 615 22.5 322.5 1.6 616 22.5 327.5 0.6 617 22.5 332.5 0.5 618 22.5 337.5 0.7 619 22.5 342.5 0.2 630 17.5 37.5 0.1 631 17.5 42.5 0.0 633 17.5 52.5 0.1 634 17.5 57.5 0.1 635 17.5 62.5 0.2 636 17.5 67.5 0.8 637 17.5 72.5 0.7 639 17.5 82.5 3.3 640 17.5 87.5 3.2 641 17.5 92.5 4.0 644 17.5 107.5 4.5 645 17.5 112.5 4.2 646 17.5 117.5 3.2 647 17.5 122.5 4.3 648 17.5 127.5 3.7 649 17.5 132.5 2.9 650 17.5 137.5 3.0 651 17.5 142.5 2.4 652 17.5 147.5 2.4 653 17.5 152.5 2.3 654 17.5 157.5 2.0 655 17.5 162.5 1.1 656 17.5 167.5 1.6 657 17.5 172.5 1.5 658 17.5 177.5 1.9 659 17.5 182.5 1.2 660 17.5 187.5 2.5 661 17.5 192.5 0.7 662 17.5 197.5 2.0 663 17.5 202.5 2.0 664 17.5 207.5 2.0 665 17.5 212.5 2.2 666 17.5 217.5 1.7 667 17.5 222.5 1.8 668 17.5 227.5 2.4 669 17.5 232.5 1.6 670 17.5 237.5 1.6 671 17.5 242.5 0.8 672 17.5 247.5 1.6 673 17.5 252.5 1.8 674 17.5 257.5 3.1 675 17.5 262.5 3.6 676 17.5 267.5 2.7 677 17.5 272.5 2.3 678 17.5 277.5 1.4 679 17.5 282.5 1.1 680 17.5 287.5 0.9 681 17.5 292.5 0.9 682 17.5 297.5 0.8 683 17.5 302.5 1.8 684 17.5 307.5 1.6 685 17.5 312.5 1.1 686 17.5 317.5 0.9 687 17.5 322.5 2.2 688 17.5 327.5 1.3 689 17.5 332.5 0.4 690 17.5 337.5 0.5 691 17.5 342.5 0.2 703 12.5 42.5 0.1 704 12.5 47.5 0.1 705 12.5 52.5 0.3 706 12.5 57.5 0.3 707 12.5 62.5 0.9 708 12.5 67.5 1.4 709 12.5 72.5 2.0 710 12.5 77.5 3.7 711 12.5 82.5 3.3 712 12.5 87.5 3.2 713 12.5 92.5 4.4 714 12.5 97.5 3.2 715 12.5 102.5 3.7 716 12.5 107.5 3.8 717 12.5 112.5 3.7 718 12.5 117.5 4.3 719 12.5 122.5 5.0 720 12.5 127.5 4.2 721 12.5 132.5 4.1 722 12.5 137.5 3.1 723 12.5 142.5 3.4 724 12.5 147.5 4.0 725 12.5 152.5 3.4 726 12.5 157.5 2.2 727 12.5 162.5 1.5 728 12.5 167.5 3.3 729 12.5 172.5 2.5 730 12.5 177.5 3.2 731 12.5 182.5 1.5 732 12.5 187.5 1.6 733 12.5 192.5 0.5 734 12.5 197.5 2.7 735 12.5 202.5 2.9 736 12.5 207.5 4.5 737 12.5 212.5 3.3 738 12.5 217.5 3.6 739 12.5 222.5 7.7 740 12.5 227.5 2.9 741 12.5 232.5 3.7 742 12.5 237.5 7.1 743 12.5 242.5 4.8 744 12.5 247.5 2.8 745 12.5 252.5 3.5 746 12.5 257.5 3.7 747 12.5 262.5 3.4 748 12.5 267.5 3.0 749 12.5 272.5 3.3 750 12.5 277.5 2.3 751 12.5 282.5 0.8 752 12.5 287.5 0.6 753 12.5 292.5 0.7 754 12.5 297.5 0.8 755 12.5 302.5 1.1 756 12.5 307.5 1.6 757 12.5 312.5 2.2 758 12.5 317.5 3.2 759 12.5 322.5 1.5 760 12.5 327.5 2.3 761 12.5 332.5 1.3 762 12.5 337.5 1.1 763 12.5 342.5 1.1 767 7.5 2.5 2.0 768 7.5 7.5 7.2 776 7.5 47.5 0.0 777 7.5 52.5 0.5 778 7.5 57.5 0.8 779 7.5 62.5 0.6 780 7.5 67.5 1.5 781 7.5 72.5 2.1 782 7.5 77.5 3.4 783 7.5 82.5 3.1 784 7.5 87.5 4.2 785 7.5 92.5 5.7 786 7.5 97.5 5.1 787 7.5 102.5 4.4 788 7.5 107.5 3.7 789 7.5 112.5 4.3 790 7.5 117.5 3.7 791 7.5 122.5 3.3 792 7.5 127.5 2.7 793 7.5 132.5 3.2 794 7.5 137.5 4.2 795 7.5 142.5 5.1 796 7.5 147.5 3.8 797 7.5 152.5 5.9 798 7.5 157.5 2.8 799 7.5 162.5 2.5 800 7.5 167.5 1.3 801 7.5 172.5 5.7 802 7.5 177.5 4.0 803 7.5 182.5 5.5 804 7.5 187.5 4.7 805 7.5 192.5 3.4 806 7.5 197.5 4.0 807 7.5 202.5 6.0 808 7.5 207.5 5.3 809 7.5 212.5 7.3 810 7.5 217.5 7.8 811 7.5 222.5 8.3 812 7.5 227.5 5.8 813 7.5 232.5 9.8 814 7.5 237.5 9.0 815 7.5 242.5 6.9 816 7.5 247.5 7.5 817 7.5 252.5 9.8 818 7.5 257.5 6.4 819 7.5 262.5 6.6 820 7.5 267.5 4.9 821 7.5 272.5 5.3 822 7.5 277.5 7.9 823 7.5 282.5 3.0 827 7.5 302.5 1.3 828 7.5 307.5 0.8 829 7.5 312.5 2.4 830 7.5 317.5 2.5 831 7.5 322.5 2.8 832 7.5 327.5 4.9 833 7.5 332.5 4.8 834 7.5 337.5 3.5 835 7.5 342.5 2.7 836 7.5 347.5 4.0 837 7.5 352.5 6.4 838 7.5 357.5 2.6 839 2.5 2.5 3.2 840 2.5 7.5 5.4 847 2.5 42.5 0.0 848 2.5 47.5 0.5 849 2.5 52.5 0.7 850 2.5 57.5 1.2 851 2.5 62.5 2.1 852 2.5 67.5 2.4 853 2.5 72.5 2.5 854 2.5 77.5 3.9 855 2.5 82.5 5.3 856 2.5 87.5 5.4 857 2.5 92.5 5.4 858 2.5 97.5 8.3 859 2.5 102.5 2.5 860 2.5 107.5 2.6 861 2.5 112.5 2.6 862 2.5 117.5 2.2 863 2.5 122.5 1.8 864 2.5 127.5 2.6 865 2.5 132.5 0.8 866 2.5 137.5 2.6 867 2.5 142.5 3.1 868 2.5 147.5 5.0 869 2.5 152.5 4.6 870 2.5 157.5 1.1 871 2.5 162.5 4.9 872 2.5 167.5 0.7 873 2.5 172.5 1.4 874 2.5 177.5 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