Altocumulus Amount-When-Present (%) December, January, February (1954 - 1997) Day, Ship Observations Only Global Average: 45.2 Zonal Averages 17 zones Lat.N Average 85 52.3 75 52.0 65 51.5 55 45.1 45 42.1 35 43.7 25 38.1 15 35.1 5 43.2 -5 45.6 -15 40.9 -25 39.8 -35 43.3 -45 51.1 -55 58.9 -65 64.1 -75 56.1 Grid Box Averages 379 filled boxes Box # Lat.N Lon.E Average 1 85 60 50.5 2 85 180 57.6 3 85 300 49.0 4 75 20 54.4 5 75 60 56.3 7 75 140 39.8 8 75 180 52.7 9 75 220 50.9 12 75 340 58.4 13 65 10 50.9 14 65 30 49.5 15 65 50 49.2 21 65 170 47.3 22 65 190 50.5 23 65 210 49.4 29 65 330 54.0 30 65 350 51.1 31 55 10 52.8 32 55 30 67.6 38 55 150 44.1 39 55 170 37.0 40 55 190 37.1 41 55 210 40.2 42 55 230 39.8 46 55 310 53.7 47 55 330 51.7 48 55 350 49.0 49 45 5 45.2 50 45 15 50.3 51 45 25 54.6 52 45 35 55.4 53 45 45 46.8 54 45 55 46.2 62 45 135 44.1 63 45 145 38.8 64 45 155 33.9 65 45 165 31.6 66 45 175 31.8 67 45 185 32.8 68 45 195 33.6 69 45 205 36.0 70 45 215 37.7 71 45 225 42.3 72 45 235 44.5 77 45 285 53.0 78 45 295 56.1 79 45 305 54.9 80 45 315 55.4 81 45 325 47.8 82 45 335 47.5 83 45 345 48.4 84 45 355 47.9 85 35 5 45.2 86 35 15 44.8 87 35 25 45.1 88 35 35 42.4 96 35 115 38.6 97 35 125 49.8 98 35 135 44.1 99 35 145 38.5 100 35 155 36.2 101 35 165 38.2 102 35 175 37.5 103 35 185 38.5 104 35 195 40.8 105 35 205 42.8 106 35 215 42.9 107 35 225 46.0 108 35 235 42.7 109 35 245 43.5 112 35 275 51.2 113 35 285 53.9 114 35 295 52.0 115 35 305 47.7 116 35 315 47.8 117 35 325 45.1 118 35 335 45.4 119 35 345 43.8 120 35 355 43.3 124 25 35 35.8 125 25 45 49.9 126 25 55 38.2 127 25 65 30.3 129 25 85 33.0 131 25 105 61.0 132 25 115 50.4 133 25 125 45.5 134 25 135 35.7 135 25 145 34.8 136 25 155 35.6 137 25 165 33.8 138 25 175 33.4 139 25 185 33.7 140 25 195 34.3 141 25 205 35.9 142 25 215 39.5 143 25 225 40.6 144 25 235 39.4 145 25 245 41.9 146 25 255 44.7 147 25 265 52.3 148 25 275 42.7 149 25 285 38.8 150 25 295 36.3 151 25 305 35.2 152 25 315 35.9 153 25 325 37.5 154 25 335 39.0 155 25 345 40.2 160 15 35 41.2 161 15 45 37.4 162 15 55 30.3 163 15 65 30.1 164 15 75 32.8 165 15 85 33.0 166 15 95 33.4 167 15 105 48.3 168 15 115 37.5 169 15 125 34.1 170 15 135 32.1 171 15 145 27.9 172 15 155 30.9 173 15 165 30.4 174 15 175 31.7 175 15 185 30.6 176 15 195 32.9 177 15 205 34.1 178 15 215 36.2 179 15 225 40.2 180 15 235 44.1 181 15 245 41.2 182 15 255 34.9 183 15 265 27.1 184 15 275 31.5 185 15 285 30.0 186 15 295 30.4 187 15 305 31.4 188 15 315 35.1 189 15 325 41.4 190 15 335 48.0 191 15 345 50.3 193 5 5 52.7 197 5 45 33.6 198 5 55 33.7 199 5 65 35.6 200 5 75 40.2 201 5 85 46.6 202 5 95 48.7 203 5 105 51.3 204 5 115 49.2 205 5 125 41.2 206 5 135 46.5 207 5 145 38.4 208 5 155 40.1 209 5 165 48.4 210 5 175 44.8 211 5 185 40.0 212 5 195 44.3 213 5 205 42.2 214 5 215 41.5 215 5 225 35.5 216 5 235 39.1 217 5 245 37.7 218 5 255 38.4 219 5 265 39.6 220 5 275 40.0 221 5 285 43.6 223 5 305 39.9 224 5 315 46.9 225 5 325 50.0 226 5 335 53.0 227 5 345 52.3 228 5 355 51.0 229 -5 5 51.2 230 -5 15 52.5 232 -5 35 37.2 233 -5 45 38.5 234 -5 55 40.6 235 -5 65 42.8 236 -5 75 46.3 237 -5 85 47.7 238 -5 95 50.9 239 -5 105 61.1 240 -5 115 62.8 241 -5 125 54.0 242 -5 135 57.2 243 -5 145 56.4 244 -5 155 49.3 245 -5 165 56.5 246 -5 175 57.4 247 -5 185 47.3 248 -5 195 40.4 249 -5 205 34.9 250 -5 215 24.7 251 -5 225 26.8 252 -5 235 30.0 253 -5 245 32.7 254 -5 255 38.9 255 -5 265 39.3 256 -5 275 44.4 257 -5 285 46.8 260 -5 315 42.8 261 -5 325 37.7 262 -5 335 36.9 263 -5 345 39.3 264 -5 355 41.9 265 -15 5 44.4 266 -15 15 62.2 268 -15 35 38.6 269 -15 45 46.1 270 -15 55 38.5 271 -15 65 36.9 272 -15 75 39.5 273 -15 85 38.1 274 -15 95 38.0 275 -15 105 40.0 276 -15 115 37.7 277 -15 125 48.1 278 -15 135 52.7 279 -15 145 46.3 280 -15 155 39.0 281 -15 165 43.0 282 -15 175 48.0 283 -15 185 50.2 284 -15 195 48.5 285 -15 205 45.7 286 -15 215 42.0 287 -15 225 36.2 288 -15 235 32.9 289 -15 245 36.3 290 -15 255 35.9 291 -15 265 33.7 292 -15 275 39.7 293 -15 285 46.3 297 -15 325 39.5 298 -15 335 33.1 299 -15 345 35.8 300 -15 355 41.1 301 -25 5 37.5 302 -25 15 50.0 304 -25 35 38.2 305 -25 45 36.1 306 -25 55 37.3 307 -25 65 36.4 308 -25 75 36.3 309 -25 85 33.7 310 -25 95 38.0 311 -25 105 41.5 312 -25 115 33.0 315 -25 145 39.9 316 -25 155 37.5 317 -25 165 37.5 318 -25 175 41.6 319 -25 185 44.4 320 -25 195 47.2 321 -25 205 50.3 322 -25 215 49.6 323 -25 225 43.4 324 -25 235 39.6 325 -25 245 32.8 326 -25 255 31.8 327 -25 265 31.8 328 -25 275 38.7 329 -25 285 49.4 332 -25 315 48.2 333 -25 325 46.1 334 -25 335 37.9 335 -25 345 31.9 336 -25 355 38.3 337 -35 5 38.9 338 -35 15 35.0 339 -35 25 38.1 340 -35 35 41.0 341 -35 45 40.5 342 -35 55 42.7 343 -35 65 41.3 344 -35 75 40.8 345 -35 85 45.2 346 -35 95 43.1 347 -35 105 45.2 348 -35 115 38.8 349 -35 125 44.0 350 -35 135 43.5 351 -35 145 42.4 352 -35 155 40.8 353 -35 165 42.4 354 -35 175 42.4 355 -35 185 44.3 356 -35 195 44.8 357 -35 205 45.1 358 -35 215 45.3 359 -35 225 46.9 360 -35 235 45.3 361 -35 245 44.2 362 -35 255 40.9 363 -35 265 40.7 364 -35 275 44.6 365 -35 285 45.1 367 -35 305 42.3 368 -35 315 45.8 369 -35 325 50.3 370 -35 335 50.9 371 -35 345 43.4 372 -35 355 41.2 373 -45 5 55.7 374 -45 15 54.9 375 -45 25 54.8 376 -45 35 55.5 377 -45 45 54.4 378 -45 55 50.6 379 -45 65 54.8 380 -45 75 60.6 381 -45 85 58.2 382 -45 95 50.6 383 -45 105 47.6 384 -45 115 52.3 385 -45 125 46.5 386 -45 135 52.7 387 -45 145 48.7 388 -45 155 45.8 389 -45 165 48.7 390 -45 175 46.8 391 -45 185 48.0 392 -45 195 47.4 393 -45 205 46.6 394 -45 215 47.1 395 -45 225 46.3 396 -45 235 45.3 397 -45 245 51.5 399 -45 265 54.0 400 -45 275 45.4 401 -45 285 47.9 402 -45 295 45.2 403 -45 305 48.6 404 -45 315 52.0 405 -45 325 58.0 406 -45 335 53.2 407 -45 345 54.3 408 -45 355 51.0 409 -55 10 65.9 410 -55 30 65.5 411 -55 50 73.9 412 -55 70 62.7 413 -55 90 63.0 414 -55 110 54.5 415 -55 130 55.0 416 -55 150 53.6 417 -55 170 62.6 418 -55 190 52.5 419 -55 210 53.8 420 -55 230 56.0 421 -55 250 45.0 422 -55 270 44.0 423 -55 290 53.3 424 -55 310 63.7 425 -55 330 67.8 426 -55 350 62.9 427 -65 10 60.9 428 -65 30 49.2 429 -65 50 57.8 430 -65 70 63.9 431 -65 90 64.4 432 -65 110 60.8 433 -65 130 67.8 434 -65 150 65.8 435 -65 170 63.0 436 -65 190 64.6 437 -65 210 69.0 438 -65 230 66.6 439 -65 250 71.7 440 -65 270 65.3 441 -65 290 57.8 442 -65 310 76.9 443 -65 330 69.1 444 -65 350 61.7 449 -75 180 49.5 450 -75 220 57.8 452 -75 300 63.8 453 -75 340 57.1