Cumulonimbus Amount-When-Present (%) September, October, November (1954 - 1997) Night, Ship Observations Only Global Average: 59.0 Zonal Averages 16 zones Lat.N Average 85 86.3 75 84.5 65 71.7 55 67.2 45 64.5 35 57.4 25 49.6 15 50.8 5 54.7 -5 52.0 -15 55.6 -25 56.6 -35 59.3 -45 61.2 -55 67.7 -65 75.0 Grid Box Averages 293 filled boxes Box # Lat.N Lon.E Average 1 85 60 86.3 4 75 20 80.3 5 75 60 86.4 6 75 100 94.2 11 75 300 74.7 12 75 340 88.6 13 65 10 68.9 14 65 30 82.7 15 65 50 78.8 21 65 170 78.0 22 65 190 75.1 27 65 290 83.1 28 65 310 68.3 29 65 330 68.7 30 65 350 74.0 31 55 10 64.6 32 55 30 73.8 38 55 150 80.1 39 55 170 69.7 40 55 190 65.1 41 55 210 61.4 42 55 230 63.1 46 55 310 73.8 47 55 330 67.8 48 55 350 62.6 49 45 5 55.4 50 45 15 60.5 51 45 25 72.9 52 45 35 83.0 62 45 135 76.2 63 45 145 76.5 64 45 155 68.2 65 45 165 64.0 66 45 175 65.9 67 45 185 60.4 68 45 195 59.2 69 45 205 59.4 70 45 215 60.6 71 45 225 59.6 72 45 235 60.6 77 45 285 65.8 78 45 295 74.5 79 45 305 70.7 80 45 315 69.7 81 45 325 65.5 82 45 335 63.5 83 45 345 61.8 84 45 355 61.9 85 35 5 56.0 86 35 15 55.0 87 35 25 54.9 88 35 35 51.2 97 35 125 71.0 98 35 135 60.5 99 35 145 60.4 100 35 155 60.2 101 35 165 57.0 102 35 175 57.4 103 35 185 57.0 104 35 195 56.7 105 35 205 58.7 106 35 215 56.9 107 35 225 58.1 108 35 235 58.6 109 35 245 63.5 112 35 275 50.6 113 35 285 53.2 114 35 295 57.5 115 35 305 55.7 116 35 315 54.0 117 35 325 55.6 118 35 335 59.2 119 35 345 58.4 120 35 355 53.7 124 25 35 48.5 126 25 55 48.3 127 25 65 51.7 132 25 115 61.6 133 25 125 53.5 134 25 135 46.9 135 25 145 46.1 136 25 155 48.5 137 25 165 49.1 138 25 175 49.2 139 25 185 48.4 140 25 195 49.0 141 25 205 50.5 142 25 215 53.8 143 25 225 56.4 144 25 235 59.1 145 25 245 51.7 146 25 255 45.8 147 25 265 45.8 148 25 275 44.2 149 25 285 47.1 150 25 295 48.1 151 25 305 50.8 152 25 315 51.4 153 25 325 51.2 154 25 335 55.7 155 25 345 54.2 161 15 45 43.9 162 15 55 52.2 163 15 65 50.7 164 15 75 54.3 165 15 85 56.8 166 15 95 54.4 167 15 105 47.9 168 15 115 52.0 169 15 125 48.4 170 15 135 48.0 171 15 145 47.7 172 15 155 52.0 173 15 165 49.6 174 15 175 49.9 175 15 185 48.3 176 15 195 51.6 177 15 205 55.0 178 15 215 56.0 179 15 225 59.4 180 15 235 57.1 181 15 245 53.1 182 15 255 50.1 183 15 265 47.9 184 15 275 47.1 185 15 285 46.2 186 15 295 45.1 187 15 305 48.5 188 15 315 49.7 189 15 325 52.5 190 15 335 57.0 191 15 345 55.3 193 5 5 58.5 197 5 45 46.6 198 5 55 49.0 199 5 65 51.0 200 5 75 53.0 201 5 85 52.3 202 5 95 54.5 203 5 105 51.0 204 5 115 52.5 205 5 125 50.9 206 5 135 48.2 207 5 145 50.5 208 5 155 50.8 209 5 165 54.4 210 5 175 54.5 211 5 185 55.2 212 5 195 52.4 213 5 205 56.2 214 5 215 60.0 215 5 225 55.3 216 5 235 61.7 217 5 245 63.1 218 5 255 61.1 219 5 265 61.3 220 5 275 59.8 221 5 285 53.8 223 5 305 47.7 224 5 315 49.4 225 5 325 56.1 226 5 335 62.2 227 5 345 61.0 228 5 355 60.9 229 -5 5 67.2 233 -5 45 49.7 234 -5 55 52.9 235 -5 65 51.3 236 -5 75 52.7 237 -5 85 51.0 238 -5 95 54.4 239 -5 105 54.1 240 -5 115 48.9 241 -5 125 45.8 242 -5 135 51.0 243 -5 145 50.6 244 -5 155 52.6 245 -5 165 51.3 246 -5 175 48.4 247 -5 185 47.8 248 -5 195 47.4 249 -5 205 40.5 251 -5 225 48.4 252 -5 235 49.9 253 -5 245 50.8 254 -5 255 58.1 255 -5 265 65.8 256 -5 275 73.5 260 -5 315 46.8 261 -5 325 49.0 262 -5 335 48.9 263 -5 345 59.2 264 -5 355 67.0 265 -15 5 79.2 266 -15 15 63.6 268 -15 35 52.0 269 -15 45 48.0 270 -15 55 53.7 271 -15 65 54.4 272 -15 75 54.7 273 -15 85 54.8 274 -15 95 53.8 275 -15 105 54.2 277 -15 125 39.1 278 -15 135 41.4 279 -15 145 47.1 280 -15 155 52.1 281 -15 165 54.5 282 -15 175 57.4 283 -15 185 52.7 284 -15 195 56.9 285 -15 205 54.2 286 -15 215 55.6 287 -15 225 53.1 288 -15 235 52.0 289 -15 245 50.1 290 -15 255 62.3 291 -15 265 67.6 292 -15 275 74.8 293 -15 285 67.2 297 -15 325 54.0 298 -15 335 53.2 299 -15 345 65.4 300 -15 355 73.3 301 -25 5 62.3 302 -25 15 51.9 304 -25 35 61.5 305 -25 45 57.7 306 -25 55 52.8 307 -25 65 51.1 308 -25 75 55.4 309 -25 85 54.0 310 -25 95 58.3 311 -25 105 60.5 312 -25 115 56.0 316 -25 155 51.5 317 -25 165 54.6 318 -25 175 51.5 319 -25 185 53.6 320 -25 195 57.2 321 -25 205 55.5 322 -25 215 60.0 323 -25 225 58.6 324 -25 235 46.8 325 -25 245 56.9 328 -25 275 73.9 329 -25 285 63.1 332 -25 315 60.4 333 -25 325 61.0 334 -25 335 56.8 335 -25 345 58.3 336 -25 355 62.6 337 -35 5 61.6 338 -35 15 54.4 339 -35 25 60.6 340 -35 35 67.6 341 -35 45 54.9 342 -35 55 55.7 343 -35 65 66.5 344 -35 75 58.5 345 -35 85 58.0 346 -35 95 59.8 347 -35 105 66.1 348 -35 115 63.5 349 -35 125 62.8 350 -35 135 61.2 351 -35 145 63.5 352 -35 155 57.4 353 -35 165 55.8 354 -35 175 53.9 355 -35 185 53.8 356 -35 195 55.7 357 -35 205 55.4 364 -35 275 66.2 365 -35 285 56.4 367 -35 305 64.0 368 -35 315 65.8 371 -35 345 57.8 372 -35 355 57.8 387 -45 145 56.4 388 -45 155 60.9 389 -45 165 65.4 390 -45 175 58.5 391 -45 185 60.8 401 -45 285 63.6 402 -45 295 64.8 417 -55 170 76.0 422 -55 270 62.9 423 -55 290 68.5 424 -55 310 70.9 425 -55 330 71.5 432 -65 110 83.1 433 -65 130 68.6