Cumulus Amount-When-Present (%) December, January, February (1954 - 1997) , Ship Observations Only Global Average: 40.0 Zonal Averages 16 zones Lat.N Average 75 50.3 65 48.5 55 52.3 45 48.0 35 43.4 25 37.5 15 35.3 5 36.7 -5 34.6 -15 35.3 -25 35.3 -35 36.7 -45 44.7 -55 49.2 -65 48.4 -75 29.7 Grid Box Averages 379 filled boxes Box # Lat.N Lon.E Average 4 75 20 51.0 5 75 60 59.1 12 75 340 41.7 13 65 10 46.5 14 65 30 51.6 15 65 50 55.6 21 65 170 48.7 22 65 190 52.9 23 65 210 48.3 27 65 290 46.8 29 65 330 45.6 30 65 350 49.9 31 55 10 41.9 32 55 30 48.9 38 55 150 52.4 39 55 170 50.6 40 55 190 50.0 41 55 210 49.6 42 55 230 51.1 46 55 310 67.1 47 55 330 50.7 48 55 350 44.7 49 45 5 38.1 50 45 15 39.0 51 45 25 47.3 52 45 35 50.1 53 45 45 52.7 54 45 55 54.8 61 45 125 42.4 62 45 135 50.3 63 45 145 50.7 64 45 155 53.9 65 45 165 49.4 66 45 175 47.3 67 45 185 47.3 68 45 195 44.7 69 45 205 45.5 70 45 215 45.6 71 45 225 47.9 72 45 235 46.6 77 45 285 44.9 78 45 295 50.9 79 45 305 53.3 80 45 315 57.0 81 45 325 49.6 82 45 335 44.9 83 45 345 43.3 84 45 355 44.3 85 35 5 37.8 86 35 15 39.3 87 35 25 39.6 88 35 35 37.7 90 35 55 51.7 96 35 115 42.7 97 35 125 50.4 98 35 135 47.2 99 35 145 46.7 100 35 155 47.8 101 35 165 46.0 102 35 175 43.4 103 35 185 42.6 104 35 195 42.4 105 35 205 42.9 106 35 215 43.4 107 35 225 44.9 108 35 235 42.2 109 35 245 39.6 112 35 275 38.8 113 35 285 44.7 114 35 295 48.3 115 35 305 43.8 116 35 315 41.0 117 35 325 40.2 118 35 335 41.6 119 35 345 41.9 120 35 355 36.3 124 25 35 30.2 125 25 45 37.6 126 25 55 30.4 127 25 65 28.9 128 25 75 35.3 129 25 85 30.7 130 25 95 32.0 131 25 105 48.3 132 25 115 44.9 133 25 125 44.1 134 25 135 39.2 135 25 145 37.4 136 25 155 37.7 137 25 165 36.9 138 25 175 37.1 139 25 185 37.4 140 25 195 37.1 141 25 205 38.1 142 25 215 40.5 143 25 225 42.7 144 25 235 42.3 145 25 245 35.1 146 25 255 32.5 147 25 265 38.2 148 25 275 37.0 149 25 285 37.6 150 25 295 35.6 151 25 305 35.1 152 25 315 35.8 153 25 325 37.6 154 25 335 38.3 155 25 345 35.1 160 15 35 33.0 161 15 45 30.5 162 15 55 32.0 163 15 65 32.3 164 15 75 29.0 165 15 85 34.0 166 15 95 31.6 167 15 105 42.5 168 15 115 37.7 169 15 125 35.6 170 15 135 36.9 171 15 145 35.5 172 15 155 35.7 173 15 165 35.3 174 15 175 36.3 175 15 185 36.2 176 15 195 35.5 177 15 205 35.0 178 15 215 37.5 179 15 225 40.9 180 15 235 43.2 181 15 245 39.5 182 15 255 30.0 183 15 265 25.5 184 15 275 33.6 185 15 285 34.5 186 15 295 33.7 187 15 305 34.5 188 15 315 35.3 189 15 325 37.9 190 15 335 36.3 191 15 345 32.2 193 5 5 38.7 197 5 45 32.8 198 5 55 34.4 199 5 65 33.2 200 5 75 31.6 201 5 85 35.8 202 5 95 36.8 203 5 105 38.1 204 5 115 37.9 205 5 125 35.7 206 5 135 34.9 207 5 145 36.9 208 5 155 36.7 209 5 165 38.2 210 5 175 39.8 211 5 185 38.2 212 5 195 35.5 213 5 205 37.1 214 5 215 38.1 215 5 225 38.0 216 5 235 38.4 217 5 245 37.4 218 5 255 37.9 219 5 265 35.2 220 5 275 31.9 221 5 285 35.0 222 5 295 37.0 223 5 305 35.7 224 5 315 39.8 225 5 325 39.9 226 5 335 40.0 227 5 345 36.4 228 5 355 38.9 229 -5 5 41.3 230 -5 15 42.0 232 -5 35 33.7 233 -5 45 33.2 234 -5 55 35.4 235 -5 65 33.5 236 -5 75 35.1 237 -5 85 34.4 238 -5 95 37.0 239 -5 105 39.3 240 -5 115 36.8 241 -5 125 35.1 242 -5 135 34.9 243 -5 145 37.0 244 -5 155 35.7 245 -5 165 36.5 246 -5 175 37.1 247 -5 185 36.0 248 -5 195 34.9 249 -5 205 34.6 250 -5 215 32.0 251 -5 225 31.7 252 -5 235 30.6 253 -5 245 31.5 254 -5 255 31.2 255 -5 265 32.4 256 -5 275 35.9 257 -5 285 36.2 260 -5 315 37.1 261 -5 325 34.7 262 -5 335 35.5 263 -5 345 34.9 264 -5 355 36.6 265 -15 5 38.8 266 -15 15 45.5 268 -15 35 32.6 269 -15 45 32.7 270 -15 55 35.6 271 -15 65 34.0 272 -15 75 35.6 273 -15 85 35.9 274 -15 95 36.4 275 -15 105 37.8 276 -15 115 34.0 277 -15 125 34.7 278 -15 135 36.1 279 -15 145 34.7 280 -15 155 34.3 281 -15 165 34.4 282 -15 175 36.4 283 -15 185 36.1 284 -15 195 38.4 285 -15 205 36.4 286 -15 215 37.5 287 -15 225 34.2 288 -15 235 33.0 289 -15 245 33.4 290 -15 255 33.0 291 -15 265 33.6 292 -15 275 41.3 293 -15 285 35.7 297 -15 325 33.8 298 -15 335 34.8 299 -15 345 33.8 300 -15 355 34.9 301 -25 5 38.9 302 -25 15 36.7 304 -25 35 33.4 305 -25 45 33.7 306 -25 55 33.9 307 -25 65 34.5 308 -25 75 33.8 309 -25 85 34.7 310 -25 95 36.4 311 -25 105 40.2 312 -25 115 33.6 315 -25 145 34.3 316 -25 155 34.7 317 -25 165 34.4 318 -25 175 36.3 319 -25 185 36.4 320 -25 195 36.4 321 -25 205 36.3 322 -25 215 36.0 323 -25 225 34.0 324 -25 235 33.6 325 -25 245 33.6 326 -25 255 32.9 327 -25 265 35.4 328 -25 275 46.8 329 -25 285 38.1 332 -25 315 33.9 333 -25 325 35.2 334 -25 335 34.6 335 -25 345 33.7 336 -25 355 34.4 337 -35 5 37.2 338 -35 15 32.7 339 -35 25 32.8 340 -35 35 35.0 341 -35 45 35.7 342 -35 55 36.5 343 -35 65 36.5 344 -35 75 35.8 345 -35 85 36.4 346 -35 95 35.3 347 -35 105 39.4 348 -35 115 36.7 349 -35 125 37.6 350 -35 135 38.2 351 -35 145 33.9 352 -35 155 34.9 353 -35 165 35.5 354 -35 175 31.1 355 -35 185 34.7 356 -35 195 35.7 357 -35 205 36.4 358 -35 215 35.0 359 -35 225 36.3 360 -35 235 32.8 361 -35 245 36.1 362 -35 255 37.1 363 -35 265 45.9 364 -35 275 52.9 365 -35 285 45.8 367 -35 305 34.3 368 -35 315 36.6 369 -35 325 38.6 370 -35 335 37.0 371 -35 345 35.8 372 -35 355 36.9 373 -45 5 50.0 374 -45 15 48.6 375 -45 25 50.1 376 -45 35 46.8 377 -45 45 46.1 378 -45 55 50.9 379 -45 65 53.5 380 -45 75 46.8 381 -45 85 51.2 382 -45 95 47.9 383 -45 105 46.7 384 -45 115 42.6 385 -45 125 42.7 386 -45 135 39.1 387 -45 145 36.7 388 -45 155 38.5 389 -45 165 43.9 390 -45 175 32.9 391 -45 185 38.9 392 -45 195 36.8 393 -45 205 40.6 394 -45 215 41.0 395 -45 225 42.8 396 -45 235 43.3 397 -45 245 41.0 398 -45 255 45.2 399 -45 265 49.6 400 -45 275 54.2 401 -45 285 48.6 402 -45 295 41.5 403 -45 305 42.3 404 -45 315 45.6 405 -45 325 47.9 406 -45 335 45.4 407 -45 345 46.7 408 -45 355 47.3 409 -55 10 50.0 410 -55 30 51.2 411 -55 50 51.2 412 -55 70 51.5 413 -55 90 48.6 414 -55 110 49.0 415 -55 130 45.1 416 -55 150 49.9 417 -55 170 52.1 418 -55 190 50.0 419 -55 210 47.7 420 -55 230 56.5 421 -55 250 40.6 422 -55 270 46.6 423 -55 290 42.8 424 -55 310 49.5 425 -55 330 53.1 426 -55 350 52.9 427 -65 10 48.3 428 -65 30 35.3 429 -65 50 41.5 430 -65 70 45.4 431 -65 90 48.9 432 -65 110 44.6 433 -65 130 45.0 434 -65 150 46.0 435 -65 170 50.9 436 -65 190 52.0 437 -65 210 49.5 438 -65 230 55.2 439 -65 250 63.1 440 -65 270 51.0 441 -65 290 38.4 442 -65 310 50.7 443 -65 330 51.1 444 -65 350 41.4 449 -75 180 29.7 452 -75 300 29.1 453 -75 340 30.4