Cumulus Amount-When-Present (%) December, January, February (1954 - 1997) Night, Ship Observations Only Global Average: 40.5 Zonal Averages 16 zones Lat.N Average 75 52.2 65 47.6 55 51.7 45 47.7 35 43.4 25 37.8 15 35.7 5 36.1 -5 34.1 -15 35.4 -25 35.9 -35 37.4 -45 45.9 -55 51.3 -65 50.9 -75 30.5 Grid Box Averages 351 filled boxes Box # Lat.N Lon.E Average 4 75 20 49.7 5 75 60 57.4 13 65 10 47.0 14 65 30 48.3 21 65 170 51.0 22 65 190 53.4 29 65 330 42.4 30 65 350 49.3 31 55 10 42.4 32 55 30 49.4 38 55 150 50.8 39 55 170 49.8 40 55 190 49.0 41 55 210 47.9 42 55 230 49.5 46 55 310 68.4 47 55 330 49.7 48 55 350 44.0 49 45 5 39.8 50 45 15 41.2 51 45 25 48.1 52 45 35 49.2 62 45 135 50.9 63 45 145 50.9 64 45 155 53.0 65 45 165 47.5 66 45 175 46.8 67 45 185 46.4 68 45 195 43.3 69 45 205 43.5 70 45 215 44.3 71 45 225 47.0 72 45 235 46.5 77 45 285 47.9 78 45 295 53.6 79 45 305 54.9 80 45 315 57.8 81 45 325 49.6 82 45 335 44.3 83 45 345 42.5 84 45 355 43.8 85 35 5 38.3 86 35 15 39.5 87 35 25 39.4 88 35 35 37.4 97 35 125 51.1 98 35 135 46.5 99 35 145 46.7 100 35 155 47.5 101 35 165 45.8 102 35 175 43.4 103 35 185 42.8 104 35 195 42.5 105 35 205 42.8 106 35 215 42.9 107 35 225 44.9 108 35 235 43.0 109 35 245 41.2 112 35 275 38.7 113 35 285 45.0 114 35 295 48.1 115 35 305 43.4 116 35 315 40.8 117 35 325 40.0 118 35 335 41.7 119 35 345 42.3 120 35 355 37.0 124 25 35 30.7 125 25 45 38.6 126 25 55 31.7 127 25 65 28.7 132 25 115 43.7 133 25 125 43.5 134 25 135 39.3 135 25 145 37.3 136 25 155 37.7 137 25 165 37.9 138 25 175 38.0 139 25 185 38.2 140 25 195 37.5 141 25 205 38.0 142 25 215 40.6 143 25 225 43.4 144 25 235 43.4 145 25 245 36.6 146 25 255 34.1 147 25 265 38.2 148 25 275 36.5 149 25 285 37.5 150 25 295 35.5 151 25 305 34.8 152 25 315 35.7 153 25 325 37.6 154 25 335 38.6 155 25 345 36.1 160 15 35 33.3 161 15 45 31.8 162 15 55 33.0 163 15 65 33.3 164 15 75 29.8 165 15 85 34.4 166 15 95 32.1 167 15 105 42.8 168 15 115 37.6 169 15 125 35.9 170 15 135 36.6 171 15 145 35.6 172 15 155 36.3 173 15 165 35.9 174 15 175 37.6 175 15 185 37.1 176 15 195 35.7 177 15 205 35.3 178 15 215 37.0 179 15 225 42.1 180 15 235 44.2 181 15 245 39.3 182 15 255 30.9 183 15 265 26.4 184 15 275 33.5 185 15 285 34.4 186 15 295 33.5 187 15 305 34.7 188 15 315 35.4 189 15 325 38.0 190 15 335 35.8 191 15 345 32.8 193 5 5 38.1 197 5 45 33.4 198 5 55 34.9 199 5 65 33.3 200 5 75 31.5 201 5 85 35.3 202 5 95 36.6 203 5 105 37.2 204 5 115 37.3 205 5 125 35.3 206 5 135 33.7 207 5 145 36.1 208 5 155 36.0 209 5 165 37.7 210 5 175 39.4 211 5 185 38.1 212 5 195 34.0 213 5 205 35.6 214 5 215 36.4 215 5 225 37.3 216 5 235 37.4 217 5 245 36.8 218 5 255 37.2 219 5 265 33.9 220 5 275 32.5 221 5 285 34.4 223 5 305 35.4 224 5 315 39.2 225 5 325 39.9 226 5 335 39.0 227 5 345 35.9 228 5 355 38.4 229 -5 5 41.4 230 -5 15 40.1 232 -5 35 35.5 233 -5 45 32.8 234 -5 55 34.0 235 -5 65 31.6 236 -5 75 33.8 237 -5 85 33.6 238 -5 95 36.6 239 -5 105 37.6 240 -5 115 36.0 241 -5 125 33.2 242 -5 135 33.1 243 -5 145 35.1 244 -5 155 33.5 245 -5 165 35.4 246 -5 175 35.4 247 -5 185 35.9 248 -5 195 34.7 249 -5 205 34.7 250 -5 215 31.2 251 -5 225 31.5 252 -5 235 30.7 253 -5 245 32.5 254 -5 255 31.1 255 -5 265 33.6 256 -5 275 38.1 257 -5 285 34.5 260 -5 315 37.5 261 -5 325 34.3 262 -5 335 35.3 263 -5 345 34.9 264 -5 355 37.0 265 -15 5 44.5 266 -15 15 45.8 268 -15 35 32.6 269 -15 45 31.9 270 -15 55 35.4 271 -15 65 33.5 272 -15 75 35.0 273 -15 85 35.8 274 -15 95 36.2 275 -15 105 38.2 276 -15 115 33.6 277 -15 125 33.5 278 -15 135 33.6 279 -15 145 34.1 280 -15 155 33.8 281 -15 165 33.5 282 -15 175 35.6 283 -15 185 35.1 284 -15 195 39.0 285 -15 205 35.2 286 -15 215 36.4 287 -15 225 34.0 288 -15 235 32.7 289 -15 245 34.4 290 -15 255 34.9 291 -15 265 38.3 292 -15 275 44.8 293 -15 285 36.2 297 -15 325 33.6 298 -15 335 35.6 299 -15 345 36.1 300 -15 355 38.5 301 -25 5 44.1 302 -25 15 36.4 304 -25 35 34.6 305 -25 45 34.4 306 -25 55 34.0 307 -25 65 34.7 308 -25 75 34.3 309 -25 85 35.6 310 -25 95 37.1 311 -25 105 41.3 312 -25 115 34.4 315 -25 145 35.5 316 -25 155 34.7 317 -25 165 34.7 318 -25 175 36.6 319 -25 185 36.3 320 -25 195 36.9 321 -25 205 36.9 322 -25 215 36.0 323 -25 225 33.4 324 -25 235 32.9 325 -25 245 34.0 326 -25 255 34.2 327 -25 265 38.9 328 -25 275 51.8 329 -25 285 39.0 332 -25 315 34.5 333 -25 325 35.7 334 -25 335 33.9 335 -25 345 34.4 336 -25 355 37.0 337 -35 5 40.0 338 -35 15 33.1 339 -35 25 34.2 340 -35 35 37.0 341 -35 45 36.1 342 -35 55 36.0 343 -35 65 37.8 344 -35 75 37.3 345 -35 85 37.9 346 -35 95 36.0 347 -35 105 40.2 348 -35 115 37.0 349 -35 125 37.0 350 -35 135 39.2 351 -35 145 34.3 352 -35 155 36.4 353 -35 165 36.4 354 -35 175 31.9 355 -35 185 34.8 356 -35 195 35.9 357 -35 205 36.7 358 -35 215 35.2 359 -35 225 38.4 360 -35 235 31.9 361 -35 245 34.8 362 -35 255 37.7 363 -35 265 47.1 364 -35 275 54.5 365 -35 285 45.2 367 -35 305 34.8 368 -35 315 36.7 369 -35 325 38.9 370 -35 335 37.0 371 -35 345 35.8 372 -35 355 37.9 373 -45 5 50.4 374 -45 15 50.9 375 -45 25 53.4 376 -45 35 52.4 378 -45 55 52.4 379 -45 65 55.8 380 -45 75 49.2 381 -45 85 55.7 382 -45 95 51.7 383 -45 105 48.2 384 -45 115 43.9 385 -45 125 40.5 386 -45 135 37.9 387 -45 145 35.9 388 -45 155 37.9 389 -45 165 44.8 390 -45 175 36.1 391 -45 185 39.4 392 -45 195 35.3 393 -45 205 41.3 399 -45 265 50.9 400 -45 275 55.6 401 -45 285 47.6 402 -45 295 41.9 403 -45 305 43.4 404 -45 315 47.6 405 -45 325 47.5 409 -55 10 52.5 410 -55 30 52.2 411 -55 50 54.8 412 -55 70 55.9 413 -55 90 51.4 414 -55 110 50.2 415 -55 130 46.5 416 -55 150 50.6 417 -55 170 53.1 422 -55 270 49.8 423 -55 290 44.3 424 -55 310 51.2 425 -55 330 53.7 426 -55 350 53.4 427 -65 10 50.7 428 -65 30 40.0 429 -65 50 43.8 430 -65 70 45.6 431 -65 90 52.8 432 -65 110 44.9 433 -65 130 45.6 434 -65 150 48.0 435 -65 170 53.8 436 -65 190 57.5 437 -65 210 50.4 438 -65 230 58.1 439 -65 250 69.5 440 -65 270 51.8 441 -65 290 39.2 442 -65 310 50.3 444 -65 350 41.0 449 -75 180 29.8 452 -75 300 31.4 453 -75 340 31.3