Cumulonimbus Amount-When-Present (%) June, July, August (1954 - 1997) , Ship Observations Only Global Average: 57.2 Zonal Averages 15 zones Lat.N Average 85 69.3 75 79.4 65 71.7 55 68.7 45 64.3 35 52.1 25 45.8 15 50.6 5 54.1 -5 50.5 -15 54.5 -25 54.3 -35 58.4 -45 65.8 -55 69.2 Grid Box Averages 340 filled boxes Box # Lat.N Lon.E Average 1 85 60 66.8 2 85 180 78.7 4 75 20 78.1 5 75 60 82.2 6 75 100 82.0 7 75 140 79.5 8 75 180 77.3 9 75 220 67.8 10 75 260 71.4 11 75 300 67.0 12 75 340 82.4 13 65 10 71.1 14 65 30 79.8 15 65 50 77.5 21 65 170 72.2 22 65 190 66.1 23 65 210 59.0 25 65 250 63.5 26 65 270 62.3 27 65 290 70.3 28 65 310 68.2 29 65 330 71.2 30 65 350 73.0 31 55 10 61.8 32 55 30 68.3 38 55 150 76.7 39 55 170 77.2 40 55 190 71.5 41 55 210 67.6 42 55 230 68.5 45 55 290 66.3 46 55 310 70.0 47 55 330 72.5 48 55 350 63.2 49 45 5 44.7 50 45 15 44.7 51 45 25 59.2 52 45 35 71.5 53 45 45 51.7 54 45 55 51.3 62 45 135 77.3 63 45 145 77.2 64 45 155 70.2 65 45 165 72.3 66 45 175 74.3 67 45 185 72.7 68 45 195 68.7 69 45 205 67.9 70 45 215 67.5 71 45 225 65.1 72 45 235 62.3 77 45 285 58.0 78 45 295 63.0 79 45 305 61.2 80 45 315 63.2 81 45 325 62.6 82 45 335 62.2 83 45 345 60.2 84 45 355 57.9 85 35 5 49.3 86 35 15 44.7 87 35 25 41.6 88 35 35 44.8 96 35 115 61.4 97 35 125 65.0 98 35 135 51.5 99 35 145 53.6 100 35 155 52.8 101 35 165 50.4 102 35 175 51.9 103 35 185 48.1 104 35 195 50.0 105 35 205 52.4 106 35 215 58.3 107 35 225 61.7 108 35 235 62.2 109 35 245 59.7 112 35 275 42.4 113 35 285 47.3 114 35 295 50.5 115 35 305 49.6 116 35 315 47.4 117 35 325 50.0 118 35 335 56.0 119 35 345 57.4 120 35 355 49.3 124 25 35 40.8 126 25 55 52.5 127 25 65 62.0 128 25 75 58.3 129 25 85 62.6 130 25 95 60.3 131 25 105 41.2 132 25 115 49.1 133 25 125 45.4 134 25 135 42.9 135 25 145 43.9 136 25 155 44.2 137 25 165 43.8 138 25 175 43.1 139 25 185 43.7 140 25 195 45.0 141 25 205 49.4 142 25 215 55.4 143 25 225 63.5 144 25 235 68.5 145 25 245 49.5 146 25 255 44.6 147 25 265 40.4 148 25 275 39.4 149 25 285 41.7 150 25 295 43.5 151 25 305 44.7 152 25 315 45.8 153 25 325 50.7 154 25 335 55.3 155 25 345 57.4 160 15 35 44.9 161 15 45 49.4 162 15 55 54.5 163 15 65 58.8 164 15 75 59.8 165 15 85 63.2 166 15 95 60.9 167 15 105 35.1 168 15 115 50.0 169 15 125 47.6 170 15 135 47.8 171 15 145 47.6 172 15 155 47.1 173 15 165 45.2 174 15 175 45.1 175 15 185 47.7 176 15 195 48.6 177 15 205 51.3 178 15 215 54.8 179 15 225 59.4 180 15 235 58.5 181 15 245 54.1 182 15 255 48.8 183 15 265 49.0 184 15 275 46.9 185 15 285 44.9 186 15 295 44.8 187 15 305 49.7 188 15 315 50.7 189 15 325 55.4 190 15 335 59.0 191 15 345 62.2 193 5 5 65.2 197 5 45 49.3 198 5 55 49.9 199 5 65 51.9 200 5 75 52.2 201 5 85 50.1 202 5 95 50.6 203 5 105 49.2 204 5 115 48.2 205 5 125 50.4 206 5 135 49.9 207 5 145 50.5 208 5 155 50.8 209 5 165 49.4 210 5 175 54.1 211 5 185 55.0 212 5 195 51.7 213 5 205 54.4 214 5 215 57.8 215 5 225 52.7 216 5 235 55.6 217 5 245 58.2 218 5 255 60.6 219 5 265 60.7 220 5 275 58.7 221 5 285 57.7 222 5 295 43.6 223 5 305 51.6 224 5 315 51.3 225 5 325 55.0 226 5 335 62.3 227 5 345 66.9 228 5 355 67.0 229 -5 5 59.4 230 -5 15 68.0 232 -5 35 55.2 233 -5 45 49.6 234 -5 55 53.3 235 -5 65 54.0 236 -5 75 54.4 237 -5 85 51.0 238 -5 95 51.4 239 -5 105 49.5 240 -5 115 43.0 241 -5 125 45.3 242 -5 135 52.0 243 -5 145 50.3 244 -5 155 52.9 245 -5 165 53.5 246 -5 175 47.2 247 -5 185 47.6 248 -5 195 47.8 249 -5 205 47.5 250 -5 215 44.5 251 -5 225 47.8 252 -5 235 45.5 253 -5 245 45.4 254 -5 255 52.1 255 -5 265 56.3 256 -5 275 68.5 260 -5 315 44.8 261 -5 325 54.0 262 -5 335 51.5 263 -5 345 47.0 264 -5 355 53.9 265 -15 5 68.2 266 -15 15 64.0 268 -15 35 51.5 269 -15 45 46.1 270 -15 55 54.0 271 -15 65 55.4 272 -15 75 54.9 273 -15 85 57.8 274 -15 95 57.2 275 -15 105 56.2 276 -15 115 50.1 277 -15 125 42.6 278 -15 135 54.8 279 -15 145 55.5 280 -15 155 54.3 281 -15 165 56.5 282 -15 175 56.0 283 -15 185 52.8 284 -15 195 54.0 285 -15 205 53.1 286 -15 215 53.1 287 -15 225 50.1 288 -15 235 50.0 289 -15 245 52.3 290 -15 255 55.0 291 -15 265 57.3 292 -15 275 67.5 293 -15 285 66.1 297 -15 325 52.5 298 -15 335 52.5 299 -15 345 52.4 300 -15 355 61.1 301 -25 5 59.4 302 -25 15 53.9 304 -25 35 52.1 305 -25 45 51.5 306 -25 55 51.5 307 -25 65 53.7 308 -25 75 50.3 309 -25 85 57.1 310 -25 95 54.2 311 -25 105 55.5 312 -25 115 57.7 315 -25 145 55.1 316 -25 155 54.3 317 -25 165 51.0 318 -25 175 53.1 319 -25 185 54.2 320 -25 195 54.8 321 -25 205 54.8 322 -25 215 59.4 323 -25 225 55.5 324 -25 235 50.4 325 -25 245 51.3 326 -25 255 54.7 327 -25 265 52.9 328 -25 275 60.9 329 -25 285 57.2 332 -25 315 56.4 333 -25 325 54.0 334 -25 335 55.0 335 -25 345 57.1 336 -25 355 54.5 337 -35 5 59.0 338 -35 15 54.4 339 -35 25 54.7 340 -35 35 55.8 341 -35 45 57.7 342 -35 55 56.5 343 -35 65 59.1 344 -35 75 62.6 345 -35 85 63.7 346 -35 95 58.3 347 -35 105 58.5 348 -35 115 60.4 349 -35 125 57.1 350 -35 135 59.2 351 -35 145 61.4 352 -35 155 55.9 353 -35 165 54.8 354 -35 175 53.0 355 -35 185 54.3 356 -35 195 54.8 357 -35 205 54.5 358 -35 215 53.4 359 -35 225 51.8 360 -35 235 60.5 362 -35 255 67.8 363 -35 265 65.3 364 -35 275 68.0 365 -35 285 62.6 367 -35 305 71.5 368 -35 315 66.0 369 -35 325 62.1 370 -35 335 57.2 371 -35 345 58.6 372 -35 355 59.3 377 -45 45 72.5 378 -45 55 68.3 379 -45 65 73.3 380 -45 75 76.8 386 -45 135 58.7 387 -45 145 61.9 388 -45 155 59.5 389 -45 165 61.4 390 -45 175 57.3 391 -45 185 62.5 392 -45 195 60.4 393 -45 205 62.5 394 -45 215 63.4 397 -45 245 76.3 398 -45 255 72.5 400 -45 275 70.7 401 -45 285 71.4 402 -45 295 65.0 403 -45 305 65.0 404 -45 315 61.4 405 -45 325 71.0 411 -55 50 73.0 412 -55 70 70.7 417 -55 170 74.7 421 -55 250 74.3 422 -55 270 61.9 423 -55 290 63.6 424 -55 310 67.0 425 -55 330 69.1