Cumulus Frequency of Occurrence (%) February (1954 - 1997) Night, Ship Observations Only Global Average: 32.1 Zonal Averages 17 zones Lat.N Average 85 0.5 75 5.6 65 12.7 55 14.7 45 17.2 35 26.1 25 37.2 15 48.0 5 46.0 -5 50.6 -15 46.7 -25 42.9 -35 28.7 -45 16.7 -55 11.7 -65 7.3 -75 6.4 Grid Box Averages 361 filled boxes Box # Lat.N Lon.E Average 2 85 180 0.5 4 75 20 11.1 5 75 60 5.3 8 75 180 0.0 12 75 340 7.4 13 65 10 12.4 14 65 30 8.8 21 65 170 8.3 22 65 190 7.0 29 65 330 12.3 30 65 350 18.3 31 55 10 14.6 32 55 30 10.9 38 55 150 12.4 39 55 170 12.9 40 55 190 12.6 41 55 210 13.4 42 55 230 13.4 46 55 310 20.3 47 55 330 16.8 48 55 350 14.4 49 45 5 21.4 50 45 15 16.8 51 45 25 13.7 52 45 35 14.1 54 45 55 11.8 62 45 135 20.2 63 45 145 22.7 64 45 155 15.9 65 45 165 15.0 66 45 175 15.4 67 45 185 16.1 68 45 195 17.9 69 45 205 16.7 70 45 215 15.7 71 45 225 13.8 72 45 235 13.9 77 45 285 16.0 78 45 295 17.0 79 45 305 13.5 80 45 315 17.3 81 45 325 18.9 82 45 335 21.4 83 45 345 20.3 84 45 355 19.6 85 35 5 24.2 86 35 15 29.2 87 35 25 33.1 88 35 35 37.7 97 35 125 19.4 98 35 135 34.8 99 35 145 27.7 100 35 155 23.1 101 35 165 27.1 102 35 175 24.4 103 35 185 21.8 104 35 195 23.9 105 35 205 21.8 106 35 215 21.7 107 35 225 23.9 108 35 235 21.3 109 35 245 16.2 112 35 275 20.4 113 35 285 25.8 114 35 295 26.1 115 35 305 28.6 116 35 315 32.2 117 35 325 29.4 118 35 335 28.3 119 35 345 29.1 120 35 355 22.8 124 25 35 19.8 125 25 45 15.3 126 25 55 16.1 127 25 65 19.4 132 25 115 17.6 133 25 125 26.8 134 25 135 34.7 135 25 145 41.1 136 25 155 40.6 137 25 165 39.6 138 25 175 38.8 139 25 185 39.5 140 25 195 45.2 141 25 205 44.9 142 25 215 36.5 143 25 225 29.7 144 25 235 25.0 145 25 245 22.9 146 25 255 27.6 147 25 265 25.2 148 25 275 39.5 149 25 285 44.1 150 25 295 49.9 151 25 305 49.8 152 25 315 45.3 153 25 325 44.3 154 25 335 42.0 155 25 345 23.2 160 15 35 25.4 161 15 45 33.2 162 15 55 48.3 163 15 65 48.1 164 15 75 37.5 165 15 85 49.1 166 15 95 28.5 167 15 105 28.5 168 15 115 50.9 169 15 125 44.8 170 15 135 52.3 171 15 145 51.5 172 15 155 58.0 173 15 165 58.4 174 15 175 55.9 175 15 185 53.9 176 15 195 60.4 177 15 205 54.1 178 15 215 44.2 179 15 225 35.7 180 15 235 29.7 181 15 245 46.2 182 15 255 41.2 183 15 265 35.2 184 15 275 48.2 185 15 285 54.5 186 15 295 61.3 187 15 305 61.3 188 15 315 56.4 189 15 325 50.1 190 15 335 34.6 191 15 345 8.9 193 5 5 46.4 197 5 45 65.5 198 5 55 64.5 199 5 65 69.8 200 5 75 47.9 201 5 85 53.7 202 5 95 49.1 203 5 105 48.3 204 5 115 45.7 205 5 125 41.4 206 5 135 50.3 207 5 145 40.3 208 5 155 45.0 209 5 165 58.5 210 5 175 43.5 211 5 185 49.6 212 5 195 47.8 213 5 205 42.7 214 5 215 44.0 215 5 225 39.6 216 5 235 28.2 217 5 245 45.6 218 5 255 50.0 219 5 265 44.0 220 5 275 38.3 221 5 285 29.5 223 5 305 53.6 224 5 315 38.0 225 5 325 43.4 226 5 335 41.6 227 5 345 28.3 228 5 355 41.7 229 -5 5 45.0 230 -5 15 38.5 233 -5 45 63.7 234 -5 55 57.3 235 -5 65 46.4 236 -5 75 45.9 237 -5 85 45.1 238 -5 95 39.2 239 -5 105 38.2 240 -5 115 32.1 241 -5 125 40.8 242 -5 135 40.2 243 -5 145 38.9 244 -5 155 40.4 245 -5 165 41.3 246 -5 175 44.7 247 -5 185 53.9 248 -5 195 54.4 249 -5 205 64.8 250 -5 215 65.6 251 -5 225 68.2 252 -5 235 68.8 253 -5 245 57.7 254 -5 255 52.6 255 -5 265 38.9 256 -5 275 29.3 257 -5 285 19.2 260 -5 315 33.1 261 -5 325 58.7 262 -5 335 57.1 263 -5 345 60.9 264 -5 355 58.9 265 -15 5 24.7 266 -15 15 19.2 268 -15 35 45.3 269 -15 45 46.4 270 -15 55 47.1 271 -15 65 47.0 272 -15 75 38.2 273 -15 85 47.3 274 -15 95 45.8 275 -15 105 47.3 276 -15 115 46.1 277 -15 125 42.5 278 -15 135 46.8 279 -15 145 38.3 280 -15 155 44.1 281 -15 165 46.0 282 -15 175 41.8 283 -15 185 42.9 284 -15 195 39.9 285 -15 205 45.4 286 -15 215 56.1 287 -15 225 62.4 288 -15 235 60.9 289 -15 245 65.4 290 -15 255 52.7 291 -15 265 37.1 292 -15 275 37.3 293 -15 285 32.4 297 -15 325 61.6 298 -15 335 59.7 299 -15 345 55.8 300 -15 355 38.7 301 -25 5 21.0 302 -25 15 24.2 304 -25 35 51.8 305 -25 45 45.9 306 -25 55 49.2 307 -25 65 45.6 308 -25 75 47.6 309 -25 85 41.2 310 -25 95 30.0 311 -25 105 31.0 312 -25 115 26.8 316 -25 155 48.2 317 -25 165 45.5 318 -25 175 40.8 319 -25 185 43.2 320 -25 195 42.5 321 -25 205 40.0 322 -25 215 51.7 323 -25 225 52.5 324 -25 235 58.5 325 -25 245 56.3 326 -25 255 48.5 327 -25 265 38.1 328 -25 275 30.5 329 -25 285 24.5 332 -25 315 37.9 333 -25 325 55.7 334 -25 335 54.5 335 -25 345 50.4 336 -25 355 35.7 337 -35 5 26.5 338 -35 15 30.4 339 -35 25 27.8 340 -35 35 33.0 341 -35 45 35.0 342 -35 55 28.3 343 -35 65 31.2 344 -35 75 22.3 345 -35 85 22.6 346 -35 95 19.7 347 -35 105 23.5 348 -35 115 28.4 349 -35 125 22.9 350 -35 135 23.5 351 -35 145 27.4 352 -35 155 36.2 353 -35 165 31.4 354 -35 175 32.0 355 -35 185 31.8 356 -35 195 32.1 357 -35 205 28.1 358 -35 215 25.0 359 -35 225 27.8 360 -35 235 32.7 363 -35 265 23.0 364 -35 275 24.6 365 -35 285 27.7 367 -35 305 31.5 368 -35 315 38.6 369 -35 325 26.0 370 -35 335 32.3 371 -35 345 32.8 372 -35 355 27.9 373 -45 5 13.5 374 -45 15 10.7 375 -45 25 21.8 376 -45 35 9.0 377 -45 45 14.4 378 -45 55 20.8 379 -45 65 17.1 380 -45 75 14.8 381 -45 85 12.6 382 -45 95 14.7 383 -45 105 16.5 384 -45 115 14.9 385 -45 125 12.6 386 -45 135 24.0 387 -45 145 19.2 388 -45 155 24.4 389 -45 165 19.2 390 -45 175 18.1 391 -45 185 20.4 392 -45 195 23.9 393 -45 205 16.7 399 -45 265 18.3 400 -45 275 22.3 401 -45 285 21.5 402 -45 295 18.8 403 -45 305 16.4 404 -45 315 19.0 405 -45 325 15.4 406 -45 335 7.2 407 -45 345 15.1 408 -45 355 7.0 409 -55 10 10.7 410 -55 30 12.5 411 -55 50 7.2 412 -55 70 12.7 413 -55 90 13.3 414 -55 110 9.0 415 -55 130 13.5 416 -55 150 12.1 417 -55 170 14.4 418 -55 190 14.3 419 -55 210 11.4 421 -55 250 3.7 422 -55 270 13.7 423 -55 290 14.0 424 -55 310 13.5 425 -55 330 8.4 426 -55 350 15.2 427 -65 10 8.1 428 -65 30 5.6 429 -65 50 7.7 430 -65 70 10.9 431 -65 90 7.0 432 -65 110 6.7 433 -65 130 3.2 434 -65 150 5.4 435 -65 170 8.5 436 -65 190 4.8 437 -65 210 10.1 438 -65 230 9.6 439 -65 250 12.1 440 -65 270 6.7 441 -65 290 6.5 442 -65 310 5.9 443 -65 330 4.6 444 -65 350 6.9 449 -75 180 10.1 450 -75 220 2.9 451 -75 260 1.9 452 -75 300 8.8 453 -75 340 6.6