Cumulus Frequency of Occurrence (%) February (1954 - 1997) Day, Ship Observations Only Global Average: 36.0 Zonal Averages 17 zones Lat.N Average 85 1.8 75 4.9 65 12.3 55 15.2 45 18.1 35 28.1 25 41.4 15 51.4 5 50.0 -5 56.0 -15 52.4 -25 49.4 -35 34.6 -45 19.8 -55 15.3 -65 9.1 -75 7.7 Grid Box Averages 383 filled boxes Box # Lat.N Lon.E Average 1 85 60 3.7 2 85 180 0.1 3 85 300 1.5 4 75 20 10.6 5 75 60 4.6 7 75 140 3.4 8 75 180 0.5 9 75 220 0.0 12 75 340 15.1 13 65 10 13.2 14 65 30 12.1 15 65 50 5.0 21 65 170 9.2 22 65 190 7.5 23 65 210 11.1 29 65 330 14.4 30 65 350 15.2 31 55 10 14.5 32 55 30 10.3 38 55 150 15.3 39 55 170 13.7 40 55 190 13.3 41 55 210 12.2 42 55 230 14.3 46 55 310 20.2 47 55 330 17.1 48 55 350 15.1 49 45 5 26.8 50 45 15 24.3 51 45 25 14.6 52 45 35 14.5 53 45 45 11.0 54 45 55 14.2 62 45 135 22.0 63 45 145 25.0 64 45 155 17.1 65 45 165 16.6 66 45 175 16.8 67 45 185 17.6 68 45 195 15.7 69 45 205 14.4 70 45 215 14.1 71 45 225 15.3 72 45 235 16.5 77 45 285 19.6 78 45 295 20.1 79 45 305 15.4 80 45 315 17.9 81 45 325 21.2 82 45 335 22.2 83 45 345 20.4 84 45 355 20.7 85 35 5 28.9 86 35 15 33.1 87 35 25 37.0 88 35 35 38.4 90 35 55 22.2 96 35 115 9.2 97 35 125 21.5 98 35 135 34.9 99 35 145 29.2 100 35 155 24.4 101 35 165 29.0 102 35 175 26.8 103 35 185 26.3 104 35 195 24.1 105 35 205 23.5 106 35 215 23.0 107 35 225 23.7 108 35 235 22.4 109 35 245 20.5 112 35 275 23.6 113 35 285 27.5 114 35 295 27.0 115 35 305 31.0 116 35 315 34.3 117 35 325 31.8 118 35 335 30.8 119 35 345 33.7 120 35 355 27.8 124 25 35 33.7 125 25 45 15.9 126 25 55 24.8 127 25 65 31.1 128 25 75 13.3 129 25 85 31.7 131 25 105 7.9 132 25 115 18.5 133 25 125 28.7 134 25 135 38.4 135 25 145 47.0 136 25 155 44.8 137 25 165 45.8 138 25 175 44.7 139 25 185 45.8 140 25 195 47.0 141 25 205 46.0 142 25 215 38.6 143 25 225 32.1 144 25 235 31.0 145 25 245 29.1 146 25 255 32.1 147 25 265 27.3 148 25 275 41.3 149 25 285 48.4 150 25 295 53.1 151 25 305 53.9 152 25 315 51.4 153 25 325 48.1 154 25 335 46.9 155 25 345 29.4 160 15 35 38.0 161 15 45 40.9 162 15 55 56.5 163 15 65 50.3 164 15 75 38.6 165 15 85 48.9 166 15 95 32.7 167 15 105 33.6 168 15 115 55.1 169 15 125 49.8 170 15 135 53.6 171 15 145 56.0 172 15 155 60.4 173 15 165 61.8 174 15 175 57.0 175 15 185 56.5 176 15 195 56.4 177 15 205 55.4 178 15 215 48.7 179 15 225 43.2 180 15 235 39.3 181 15 245 49.8 182 15 255 51.0 183 15 265 41.1 184 15 275 47.7 185 15 285 60.3 186 15 295 64.6 187 15 305 61.3 188 15 315 59.1 189 15 325 52.7 190 15 335 39.9 191 15 345 10.0 193 5 5 43.7 197 5 45 71.1 198 5 55 69.5 199 5 65 73.8 200 5 75 57.1 201 5 85 58.7 202 5 95 53.0 203 5 105 52.5 204 5 115 50.8 205 5 125 46.4 206 5 135 47.1 207 5 145 46.1 208 5 155 45.8 209 5 165 52.2 210 5 175 51.5 211 5 185 48.1 212 5 195 52.4 213 5 205 47.4 214 5 215 44.5 215 5 225 40.1 216 5 235 43.1 217 5 245 54.7 218 5 255 54.8 219 5 265 52.7 220 5 275 44.6 221 5 285 34.9 223 5 305 55.2 224 5 315 42.3 225 5 325 44.6 226 5 335 45.6 227 5 345 32.3 228 5 355 45.7 229 -5 5 56.0 230 -5 15 41.0 232 -5 35 58.0 233 -5 45 68.2 234 -5 55 62.7 235 -5 65 57.0 236 -5 75 50.2 237 -5 85 52.8 238 -5 95 47.1 239 -5 105 42.4 240 -5 115 37.5 241 -5 125 45.6 242 -5 135 44.3 243 -5 145 40.3 244 -5 155 41.4 245 -5 165 47.2 246 -5 175 46.1 247 -5 185 54.7 248 -5 195 61.6 249 -5 205 67.2 250 -5 215 67.3 251 -5 225 67.6 252 -5 235 69.7 253 -5 245 64.0 254 -5 255 58.2 255 -5 265 53.8 256 -5 275 38.1 257 -5 285 24.5 260 -5 315 39.9 261 -5 325 60.4 262 -5 335 62.5 263 -5 345 68.8 264 -5 355 69.1 265 -15 5 39.9 266 -15 15 19.5 268 -15 35 52.9 269 -15 45 47.6 270 -15 55 55.0 271 -15 65 50.6 272 -15 75 47.7 273 -15 85 54.6 274 -15 95 52.0 275 -15 105 49.7 276 -15 115 47.4 277 -15 125 48.3 278 -15 135 41.8 279 -15 145 41.3 280 -15 155 46.9 281 -15 165 45.6 282 -15 175 44.2 283 -15 185 43.6 284 -15 195 47.8 285 -15 205 50.3 286 -15 215 54.6 287 -15 225 65.4 288 -15 235 72.3 289 -15 245 65.7 290 -15 255 62.8 291 -15 265 52.0 292 -15 275 49.5 293 -15 285 33.4 297 -15 325 63.5 298 -15 335 66.7 299 -15 345 62.3 300 -15 355 54.5 301 -25 5 38.7 302 -25 15 24.8 304 -25 35 53.9 305 -25 45 53.1 306 -25 55 54.4 307 -25 65 52.9 308 -25 75 57.5 309 -25 85 51.4 310 -25 95 44.5 311 -25 105 33.9 312 -25 115 32.7 315 -25 145 48.5 316 -25 155 51.6 317 -25 165 51.7 318 -25 175 47.0 319 -25 185 44.6 320 -25 195 45.5 321 -25 205 43.4 322 -25 215 53.3 323 -25 225 57.8 324 -25 235 59.6 325 -25 245 61.9 326 -25 255 62.4 327 -25 265 55.0 328 -25 275 39.8 329 -25 285 22.4 332 -25 315 45.2 333 -25 325 58.6 334 -25 335 56.4 335 -25 345 55.4 336 -25 355 49.7 337 -35 5 36.2 338 -35 15 31.9 339 -35 25 32.1 340 -35 35 42.0 341 -35 45 37.4 342 -35 55 31.5 343 -35 65 34.3 344 -35 75 33.9 345 -35 85 32.2 346 -35 95 27.4 347 -35 105 25.1 348 -35 115 30.4 349 -35 125 26.1 350 -35 135 27.3 351 -35 145 29.9 352 -35 155 40.5 353 -35 165 40.7 354 -35 175 40.7 355 -35 185 42.2 356 -35 195 31.6 357 -35 205 32.1 358 -35 215 31.9 359 -35 225 33.8 360 -35 235 38.0 361 -35 245 46.9 362 -35 255 36.4 363 -35 265 30.1 364 -35 275 28.5 365 -35 285 24.5 367 -35 305 34.6 368 -35 315 41.9 369 -35 325 32.4 370 -35 335 34.8 371 -35 345 38.6 372 -35 355 40.7 373 -45 5 13.7 374 -45 15 14.3 375 -45 25 14.7 376 -45 35 16.7 377 -45 45 16.4 378 -45 55 20.6 379 -45 65 19.4 380 -45 75 20.5 381 -45 85 21.0 382 -45 95 18.2 383 -45 105 13.5 384 -45 115 20.6 385 -45 125 17.4 386 -45 135 21.4 387 -45 145 25.6 388 -45 155 25.9 389 -45 165 25.6 390 -45 175 26.2 391 -45 185 25.2 392 -45 195 25.1 393 -45 205 16.8 394 -45 215 18.6 395 -45 225 22.9 396 -45 235 20.3 397 -45 245 16.6 398 -45 255 19.9 399 -45 265 17.3 400 -45 275 24.0 401 -45 285 22.5 402 -45 295 20.3 403 -45 305 19.4 404 -45 315 22.1 405 -45 325 17.0 406 -45 335 15.7 407 -45 345 22.4 408 -45 355 17.3 409 -55 10 13.0 410 -55 30 13.0 411 -55 50 12.8 412 -55 70 16.2 413 -55 90 13.4 414 -55 110 15.4 415 -55 130 15.0 416 -55 150 14.1 417 -55 170 18.6 418 -55 190 12.9 419 -55 210 19.3 420 -55 230 10.8 421 -55 250 15.8 422 -55 270 20.8 423 -55 290 18.1 424 -55 310 16.0 425 -55 330 11.8 426 -55 350 18.2 427 -65 10 9.7 428 -65 30 8.5 429 -65 50 10.9 430 -65 70 13.2 431 -65 90 8.1 432 -65 110 10.6 433 -65 130 7.8 434 -65 150 6.7 435 -65 170 9.0 436 -65 190 7.8 437 -65 210 10.0 438 -65 230 11.7 439 -65 250 14.1 440 -65 270 7.8 441 -65 290 6.3 442 -65 310 7.4 443 -65 330 5.5 444 -65 350 9.2 449 -75 180 13.0 450 -75 220 2.1 451 -75 260 3.8 452 -75 300 8.2 453 -75 340 8.9