Cumulonimbus Amount-When-Present (%) December, January, February (1971 - 1996) Night, Land Areas Only Global Average: 61.7 Zonal Averages 28 zones Lat.N Average 77.5 82.2 72.5 77.6 67.5 78.7 62.5 79.3 57.5 74.6 52.5 76.1 47.5 80.5 42.5 81.2 37.5 72.0 32.5 68.4 27.5 62.4 22.5 57.9 17.5 43.9 12.5 46.8 7.5 48.2 2.5 41.5 -2.5 43.5 -7.5 47.0 -12.5 46.0 -17.5 44.4 -22.5 43.3 -27.5 45.7 -32.5 46.9 -37.5 39.8 -42.5 47.6 -47.5 63.9 -52.5 72.9 -62.5 63.3 Grid Box Averages 530 boxes filled with min 30 obs. Box # Lat.N Lon.E Average N.Obs. 11 77.5 10.0 82.8 469 12 77.5 30.0 81.4 264 14 77.5 70.0 75.6 44 29 72.5 10.0 78.8 884 30 72.5 30.0 76.1 3965 31 72.5 50.0 84.8 486 32 72.5 70.0 82.5 91 34 72.5 110.0 55.4 44 46 72.5 -10.0 80.8 426 48 67.5 15.0 73.1 6719 49 67.5 25.0 75.9 844 50 67.5 35.0 77.9 11532 51 67.5 45.0 80.1 3640 52 67.5 55.0 86.4 1529 53 67.5 65.0 85.9 1235 54 67.5 75.0 81.5 174 55 67.5 85.0 82.5 701 56 67.5 95.0 80.4 165 65 67.5 -175.0 63.6 33 66 67.5 -165.0 82.1 49 77 67.5 -55.0 43.9 88 80 67.5 -25.0 75.5 753 81 67.5 -15.0 79.7 1026 83 62.5 5.0 70.9 5746 84 62.5 15.0 76.9 2684 85 62.5 25.0 70.2 351 86 62.5 35.0 87.4 2681 87 62.5 45.0 86.2 3095 88 62.5 55.0 83.1 1219 89 62.5 65.0 70.0 347 90 62.5 75.0 81.6 668 91 62.5 85.0 86.9 905 92 62.5 95.0 72.5 1301 93 62.5 105.0 66.8 212 94 62.5 115.0 63.7 294 95 62.5 125.0 48.4 170 96 62.5 135.0 39.3 35 97 62.5 145.0 71.4 59 98 62.5 155.0 80.7 165 99 62.5 165.0 82.4 2533 100 62.5 175.0 83.3 442 101 62.5 -175.0 85.7 176 113 62.5 -55.0 79.0 41 114 62.5 -45.0 85.8 36 116 62.5 -25.0 66.4 1298 117 62.5 -15.0 49.0 51 118 62.5 -5.0 71.8 2321 119 57.5 5.0 62.8 3250 120 57.5 15.0 77.1 2984 121 57.5 25.0 89.9 5261 122 57.5 35.0 91.5 2754 123 57.5 45.0 86.4 1712 124 57.5 55.0 87.1 3072 125 57.5 65.0 73.0 570 126 57.5 75.0 78.6 1403 127 57.5 85.0 73.8 6822 128 57.5 95.0 70.4 4939 129 57.5 105.0 60.7 4393 130 57.5 115.0 56.5 2386 131 57.5 125.0 57.4 485 132 57.5 135.0 62.9 156 133 57.5 145.0 70.2 485 134 57.5 155.0 72.4 3354 135 57.5 165.0 80.9 4222 154 57.5 -5.0 58.1 4874 155 52.5 5.0 70.2 2791 156 52.5 15.0 84.4 5046 157 52.5 25.0 90.5 3571 158 52.5 35.0 88.9 2445 159 52.5 45.0 90.6 1929 160 52.5 55.0 88.7 890 161 52.5 65.0 68.6 231 162 52.5 75.0 84.9 1317 163 52.5 85.0 80.3 5791 164 52.5 95.0 62.0 2660 165 52.5 105.0 61.2 8137 166 52.5 115.0 43.7 1598 167 52.5 125.0 53.7 67 168 52.5 135.0 60.9 1682 169 52.5 145.0 71.3 7555 170 52.5 155.0 80.2 7250 177 52.5 -135.0 61.7 337 178 52.5 -125.0 73.7 209 179 52.5 -115.0 78.9 32 185 52.5 -55.0 93.9 70 189 52.5 -15.0 69.5 340 190 52.5 -5.0 60.4 4747 191 47.5 2.5 64.3 265 192 47.5 7.5 83.5 443 193 47.5 12.5 74.9 212 194 47.5 17.5 84.2 367 195 47.5 22.5 83.5 1838 196 47.5 27.5 79.3 2116 197 47.5 32.5 89.5 2557 198 47.5 37.5 91.4 2720 199 47.5 42.5 85.0 2777 200 47.5 47.5 67.1 103 201 47.5 52.5 70.4 52 202 47.5 57.5 70.2 75 203 47.5 62.5 77.4 138 204 47.5 67.5 84.1 110 205 47.5 72.5 75.9 142 206 47.5 77.5 74.5 533 207 47.5 82.5 84.6 650 208 47.5 87.5 68.7 470 211 47.5 102.5 39.5 31 212 47.5 107.5 37.5 42 217 47.5 132.5 70.7 487 218 47.5 137.5 78.0 3559 219 47.5 142.5 81.8 12591 220 47.5 147.5 85.2 1318 221 47.5 152.5 79.1 5127 238 47.5 -122.5 71.9 49 246 47.5 -82.5 98.9 58 251 47.5 -57.5 96.0 128 252 47.5 -52.5 97.3 47 261 47.5 -7.5 58.3 356 262 47.5 -2.5 60.8 1964 263 42.5 2.5 63.8 164 264 42.5 7.5 59.1 588 265 42.5 12.5 67.3 475 266 42.5 17.5 64.0 469 267 42.5 22.5 80.2 485 268 42.5 27.5 65.6 422 269 42.5 32.5 84.6 759 270 42.5 37.5 88.3 2380 271 42.5 42.5 88.3 4394 272 42.5 47.5 79.6 478 273 42.5 52.5 81.2 472 274 42.5 57.5 88.8 428 275 42.5 62.5 61.1 165 276 42.5 67.5 76.2 805 277 42.5 72.5 77.0 554 278 42.5 77.5 72.2 1564 279 42.5 82.5 55.0 114 288 42.5 127.5 80.0 98 289 42.5 132.5 67.9 1496 290 42.5 137.5 93.5 678 291 42.5 142.5 86.3 11989 292 42.5 147.5 73.1 2211 318 42.5 -82.5 98.2 141 319 42.5 -77.5 98.5 81 320 42.5 -72.5 91.5 44 322 42.5 -62.5 97.2 31 333 42.5 -7.5 69.4 1407 334 42.5 -2.5 70.7 621 335 37.5 2.5 69.8 429 336 37.5 7.5 79.8 1938 337 37.5 12.5 65.8 983 338 37.5 17.5 61.9 451 339 37.5 22.5 54.5 567 340 37.5 27.5 58.8 599 341 37.5 32.5 59.1 286 342 37.5 37.5 62.3 504 343 37.5 42.5 52.9 43 344 37.5 47.5 61.9 798 345 37.5 52.5 54.9 612 346 37.5 57.5 74.2 592 347 37.5 62.5 77.2 740 348 37.5 67.5 78.0 2940 349 37.5 72.5 76.8 3423 350 37.5 77.5 58.1 34 353 37.5 92.5 59.2 91 354 37.5 97.5 49.7 399 355 37.5 102.5 54.5 320 360 37.5 127.5 72.0 159 361 37.5 132.5 91.8 665 362 37.5 137.5 90.3 3626 363 37.5 142.5 78.7 4703 388 37.5 -92.5 76.6 40 390 37.5 -82.5 79.9 43 391 37.5 -77.5 77.3 33 400 37.5 -32.5 57.5 98 401 37.5 -27.5 66.1 481 405 37.5 -7.5 71.8 921 406 37.5 -2.5 65.5 382 408 32.5 7.5 42.9 79 409 32.5 12.5 63.7 285 410 32.5 17.5 64.1 138 411 32.5 22.5 58.7 266 412 32.5 27.5 66.2 173 413 32.5 32.5 57.4 791 414 32.5 37.5 66.4 467 416 32.5 47.5 63.6 618 418 32.5 57.5 59.4 129 420 32.5 67.5 46.9 32 421 32.5 72.5 49.8 221 422 32.5 77.5 56.8 55 423 32.5 82.5 69.0 263 424 32.5 87.5 76.8 145 425 32.5 92.5 80.6 1216 426 32.5 97.5 74.7 3829 427 32.5 102.5 75.7 1691 428 32.5 107.5 74.1 68 429 32.5 112.5 73.4 77 430 32.5 117.5 69.4 47 432 32.5 127.5 80.9 513 433 32.5 132.5 82.1 167 434 32.5 137.5 76.3 161 460 32.5 -92.5 87.1 57 461 32.5 -87.5 91.8 55 462 32.5 -82.5 77.0 80 475 32.5 -17.5 69.0 216 477 32.5 -7.5 78.6 850 478 32.5 -2.5 73.2 256 486 27.5 37.5 49.1 44 487 27.5 42.5 66.2 54 489 27.5 52.5 56.9 273 490 27.5 57.5 51.7 89 491 27.5 62.5 53.5 75 493 27.5 72.5 48.8 43 494 27.5 77.5 50.9 238 495 27.5 82.5 53.6 126 496 27.5 87.5 72.2 478 497 27.5 92.5 74.5 655 498 27.5 97.5 62.0 716 499 27.5 102.5 79.7 415 500 27.5 107.5 92.7 381 501 27.5 112.5 95.6 717 502 27.5 117.5 86.9 274 503 27.5 122.5 81.7 105 527 27.5 -117.5 61.2 49 531 27.5 -97.5 74.6 32 534 27.5 -82.5 50.0 58 535 27.5 -77.5 59.7 174 558 22.5 37.5 44.9 37 559 22.5 42.5 41.4 42 560 22.5 47.5 47.9 35 562 22.5 57.5 56.4 51 566 22.5 77.5 50.8 206 567 22.5 82.5 52.7 125 568 22.5 87.5 50.8 150 569 22.5 92.5 54.1 307 570 22.5 97.5 58.0 357 571 22.5 102.5 81.8 361 572 22.5 107.5 92.8 275 573 22.5 112.5 94.8 379 574 22.5 117.5 77.6 109 575 22.5 122.5 68.1 213 581 22.5 152.5 68.0 34 602 22.5 -102.5 71.2 89 605 22.5 -87.5 46.1 45 606 22.5 -82.5 41.7 498 607 22.5 -77.5 52.0 259 608 22.5 -72.5 55.6 161 631 17.5 42.5 48.6 53 637 17.5 72.5 40.3 36 638 17.5 77.5 43.5 73 641 17.5 92.5 35.7 76 642 17.5 97.5 39.6 260 643 17.5 102.5 46.6 244 645 17.5 112.5 87.5 46 646 17.5 117.5 26.6 32 647 17.5 122.5 33.1 54 674 17.5 -102.5 51.1 35 675 17.5 -97.5 56.2 133 676 17.5 -92.5 58.0 55 677 17.5 -87.5 47.0 404 678 17.5 -82.5 42.5 151 679 17.5 -77.5 39.8 359 680 17.5 -72.5 33.9 100 681 17.5 -67.5 45.7 166 682 17.5 -62.5 50.9 43 691 17.5 -17.5 27.4 42 695 12.5 2.5 20.1 56 702 12.5 37.5 61.2 156 710 12.5 77.5 41.8 175 711 12.5 82.5 52.4 41 713 12.5 92.5 53.0 152 714 12.5 97.5 29.5 562 715 12.5 102.5 42.1 395 716 12.5 107.5 51.2 74 719 12.5 122.5 38.1 922 720 12.5 127.5 43.6 488 723 12.5 142.5 48.6 65 748 12.5 -92.5 26.2 43 749 12.5 -87.5 37.6 201 750 12.5 -82.5 42.5 118 751 12.5 -77.5 24.3 36 752 12.5 -72.5 31.1 116 753 12.5 -67.5 49.3 206 754 12.5 -62.5 56.3 277 766 12.5 -2.5 21.8 91 767 7.5 2.5 40.0 398 768 7.5 7.5 60.0 117 769 7.5 12.5 40.4 146 774 7.5 37.5 52.3 222 781 7.5 72.5 45.7 61 782 7.5 77.5 46.1 420 783 7.5 82.5 44.7 194 786 7.5 97.5 41.5 1915 787 7.5 102.5 33.7 1307 788 7.5 107.5 49.5 49 790 7.5 117.5 45.3 383 791 7.5 122.5 34.8 660 792 7.5 127.5 28.6 335 793 7.5 132.5 46.1 162 794 7.5 137.5 46.7 202 797 7.5 152.5 49.4 82 798 7.5 157.5 73.6 52 800 7.5 167.5 42.0 50 801 7.5 172.5 54.4 31 824 7.5 -72.5 43.3 443 826 7.5 -62.5 55.4 140 827 7.5 -57.5 43.2 202 828 7.5 -52.5 58.2 32 836 7.5 -12.5 45.1 61 837 7.5 -7.5 54.1 291 838 7.5 -2.5 50.1 414 840 2.5 7.5 61.4 2155 841 2.5 12.5 50.6 858 842 2.5 17.5 17.2 64 843 2.5 22.5 25.0 47 845 2.5 32.5 27.6 647 846 2.5 37.5 31.5 785 847 2.5 42.5 37.9 67 853 2.5 72.5 44.3 105 858 2.5 97.5 44.5 3573 859 2.5 102.5 35.9 4389 861 2.5 112.5 42.2 1172 862 2.5 117.5 49.0 66 863 2.5 122.5 47.2 423 864 2.5 127.5 52.2 523 873 2.5 172.5 41.5 779 879 2.5 -157.5 34.8 163 895 2.5 -77.5 22.5 66 898 2.5 -62.5 60.3 87 899 2.5 -57.5 46.4 178 900 2.5 -52.5 62.4 81 909 2.5 -7.5 49.5 510 910 2.5 -2.5 37.8 81 912 -2.5 7.5 56.6 389 913 -2.5 12.5 53.5 3948 914 -2.5 17.5 32.1 696 916 -2.5 27.5 31.8 334 917 -2.5 32.5 28.7 1110 918 -2.5 37.5 38.5 1234 919 -2.5 42.5 35.6 105 922 -2.5 57.5 52.4 563 931 -2.5 102.5 51.6 2621 932 -2.5 107.5 49.4 918 933 -2.5 112.5 44.6 177 934 -2.5 117.5 42.5 771 935 -2.5 122.5 44.3 382 936 -2.5 127.5 40.9 221 937 -2.5 132.5 50.1 471 938 -2.5 137.5 43.5 495 939 -2.5 142.5 46.9 133 940 -2.5 147.5 44.6 49 941 -2.5 152.5 51.2 41 946 -2.5 177.5 39.2 455 966 -2.5 -82.5 40.1 38 969 -2.5 -67.5 86.5 163 970 -2.5 -62.5 64.3 154 972 -2.5 -52.5 60.3 62 985 -7.5 12.5 35.3 110 989 -7.5 32.5 43.9 202 990 -7.5 37.5 38.8 945 997 -7.5 72.5 54.8 96 1004 -7.5 107.5 53.1 1977 1005 -7.5 112.5 50.9 1409 1006 -7.5 117.5 49.4 1398 1007 -7.5 122.5 43.3 484 1008 -7.5 127.5 45.3 151 1009 -7.5 132.5 49.2 244 1011 -7.5 142.5 46.5 161 1012 -7.5 147.5 56.6 579 1014 -7.5 157.5 32.8 692 1015 -7.5 162.5 34.6 465 1018 -7.5 177.5 37.4 3361 1020 -7.5 -172.5 45.1 1197 1023 -7.5 -157.5 71.5 53 1027 -7.5 -137.5 64.4 80 1039 -7.5 -77.5 51.6 111 1041 -7.5 -67.5 49.5 109 1042 -7.5 -62.5 57.5 124 1045 -7.5 -47.5 68.0 217 1048 -7.5 -32.5 73.8 73 1057 -12.5 12.5 38.0 164 1058 -12.5 17.5 40.2 174 1059 -12.5 22.5 15.8 83 1060 -12.5 27.5 18.5 265 1061 -12.5 32.5 23.3 510 1062 -12.5 37.5 62.4 462 1063 -12.5 42.5 45.3 545 1064 -12.5 47.5 48.5 2182 1065 -12.5 52.5 55.9 647 1066 -12.5 57.5 59.4 401 1074 -12.5 97.5 43.9 99 1079 -12.5 122.5 51.6 237 1081 -12.5 132.5 49.1 330 1082 -12.5 137.5 48.4 166 1083 -12.5 142.5 52.3 433 1087 -12.5 162.5 41.2 355 1088 -12.5 167.5 57.4 249 1090 -12.5 177.5 43.2 1180 1091 -12.5 -177.5 56.3 1203 1092 -12.5 -172.5 56.0 540 1093 -12.5 -167.5 65.9 227 1094 -12.5 -162.5 51.9 53 1097 -12.5 -147.5 59.4 170 1113 -12.5 -67.5 58.3 33 1114 -12.5 -62.5 51.2 436 1115 -12.5 -57.5 78.6 282 1117 -12.5 -47.5 57.2 78 1129 -17.5 12.5 23.1 66 1130 -17.5 17.5 41.4 1757 1131 -17.5 22.5 31.4 635 1132 -17.5 27.5 15.7 747 1133 -17.5 32.5 46.6 1157 1134 -17.5 37.5 52.2 849 1135 -17.5 42.5 41.7 1827 1136 -17.5 47.5 48.0 2407 1137 -17.5 52.5 49.8 394 1138 -17.5 57.5 57.7 260 1139 -17.5 62.5 54.9 92 1151 -17.5 122.5 29.9 230 1152 -17.5 127.5 65.5 250 1153 -17.5 132.5 43.0 126 1154 -17.5 137.5 46.9 220 1155 -17.5 142.5 63.3 1001 1156 -17.5 147.5 48.5 338 1160 -17.5 167.5 59.6 719 1162 -17.5 177.5 52.7 2821 1163 -17.5 -177.5 60.3 909 1164 -17.5 -172.5 57.1 704 1165 -17.5 -167.5 66.0 634 1166 -17.5 -162.5 56.1 94 1167 -17.5 -157.5 61.1 183 1168 -17.5 -152.5 52.3 206 1169 -17.5 -147.5 52.0 354 1170 -17.5 -142.5 49.9 462 1185 -17.5 -67.5 42.8 561 1186 -17.5 -62.5 48.9 622 1187 -17.5 -57.5 48.0 32 1188 -17.5 -52.5 53.8 70 1189 -17.5 -47.5 51.7 187 1190 -17.5 -42.5 52.5 35 1201 -22.5 12.5 38.5 39 1202 -22.5 17.5 46.5 1711 1203 -22.5 22.5 34.4 915 1204 -22.5 27.5 29.5 636 1205 -22.5 32.5 15.6 450 1206 -22.5 37.5 66.3 39 1207 -22.5 42.5 32.9 1832 1208 -22.5 47.5 53.1 1233 1210 -22.5 57.5 61.6 511 1221 -22.5 112.5 20.0 110 1222 -22.5 117.5 24.3 122 1225 -22.5 132.5 37.8 37 1226 -22.5 137.5 66.7 42 1227 -22.5 142.5 61.5 460 1228 -22.5 147.5 57.6 429 1229 -22.5 152.5 47.5 234 1232 -22.5 167.5 47.1 567 1235 -22.5 -177.5 55.9 143 1239 -22.5 -157.5 55.2 193 1241 -22.5 -147.5 60.6 47 1243 -22.5 -137.5 57.5 292 1244 -22.5 -132.5 50.8 278 1257 -22.5 -67.5 60.4 594 1258 -22.5 -62.5 58.7 101 1259 -22.5 -57.5 42.1 62 1260 -22.5 -52.5 59.8 124 1261 -22.5 -47.5 57.1 167 1262 -22.5 -42.5 59.3 101 1274 -27.5 17.5 34.8 874 1275 -27.5 22.5 38.8 2670 1276 -27.5 27.5 28.4 1442 1277 -27.5 32.5 55.3 487 1280 -27.5 47.5 46.1 213 1293 -27.5 112.5 20.3 167 1294 -27.5 117.5 46.4 79 1296 -27.5 127.5 38.1 168 1297 -27.5 132.5 64.7 78 1298 -27.5 137.5 53.0 76 1299 -27.5 142.5 58.1 318 1300 -27.5 147.5 50.4 365 1301 -27.5 152.5 40.7 35 1307 -27.5 -177.5 61.0 49 1314 -27.5 -142.5 57.9 46 1329 -27.5 -67.5 61.6 952 1330 -27.5 -62.5 54.1 881 1331 -27.5 -57.5 47.1 2179 1332 -27.5 -52.5 52.8 186 1333 -27.5 -47.5 60.6 103 1346 -32.5 17.5 38.5 193 1347 -32.5 22.5 48.1 1519 1348 -32.5 27.5 52.8 993 1349 -32.5 32.5 66.3 40 1366 -32.5 117.5 58.6 302 1367 -32.5 122.5 37.0 81 1368 -32.5 127.5 32.3 80 1370 -32.5 137.5 42.5 75 1371 -32.5 142.5 41.5 71 1372 -32.5 147.5 47.8 262 1373 -32.5 152.5 40.4 127 1377 -32.5 172.5 49.4 125 1401 -32.5 -67.5 47.7 7006 1402 -32.5 -62.5 49.5 3324 1403 -32.5 -57.5 40.8 2571 1404 -32.5 -52.5 36.1 208 1442 -37.5 137.5 66.5 71 1443 -37.5 142.5 40.3 110 1444 -37.5 147.5 46.5 315 1445 -37.5 152.5 65.2 103 1449 -37.5 172.5 59.1 115 1450 -37.5 177.5 50.6 79 1472 -37.5 -72.5 46.6 33 1473 -37.5 -67.5 36.1 1476 1474 -37.5 -62.5 41.8 2371 1475 -37.5 -57.5 38.7 713 1516 -42.5 147.5 64.3 217 1521 -42.5 172.5 55.6 445 1522 -42.5 177.5 47.9 36 1523 -42.5 -177.5 56.5 58 1544 -42.5 -72.5 43.8 109 1545 -42.5 -67.5 41.7 469 1546 -42.5 -62.5 42.5 480 1566 -47.5 37.5 48.3 36 1569 -47.5 52.5 58.1 34 1592 -47.5 167.5 64.0 364 1616 -47.5 -72.5 75.2 139 1617 -47.5 -67.5 53.6 263 1646 -52.5 155.0 60.3 57 1647 -52.5 165.0 69.6 129 1659 -52.5 -75.0 80.5 364 1660 -52.5 -65.0 52.6 166 1661 -52.5 -55.0 53.7 148 1733 -62.5 -55.0 63.3 104