Altocumulus Amount-When-Present (%) December, January, February (1954 - 1997) Night, Ship Observations Only Global Average: 50.1 Zonal Averages 17 zones Lat.N Average 85 55.6 75 57.8 65 51.7 55 49.1 45 46.8 35 48.8 25 45.2 15 41.9 5 48.4 -5 51.7 -15 47.1 -25 45.9 -35 47.5 -45 54.1 -55 62.1 -65 65.4 -75 57.7 Grid Box Averages 358 filled boxes Box # Lat.N Lon.E Average 1 85 60 52.2 2 85 180 61.3 4 75 20 53.2 5 75 60 51.9 8 75 180 57.9 9 75 220 66.0 13 65 10 52.2 14 65 30 49.8 21 65 170 50.0 22 65 190 54.8 29 65 330 53.5 30 65 350 50.0 31 55 10 52.7 32 55 30 72.5 38 55 150 48.5 39 55 170 42.1 40 55 190 41.1 41 55 210 44.2 42 55 230 45.1 46 55 310 59.4 47 55 330 56.8 48 55 350 50.7 49 45 5 46.9 50 45 15 55.9 51 45 25 59.0 52 45 35 60.9 62 45 135 48.9 63 45 145 43.3 64 45 155 39.9 65 45 165 36.5 66 45 175 37.2 67 45 185 37.5 68 45 195 38.1 69 45 205 42.3 70 45 215 42.8 71 45 225 45.7 72 45 235 49.6 77 45 285 61.7 78 45 295 60.1 79 45 305 60.2 80 45 315 61.2 81 45 325 53.8 82 45 335 52.1 83 45 345 53.8 84 45 355 51.6 85 35 5 46.4 86 35 15 49.0 87 35 25 50.5 88 35 35 46.5 97 35 125 54.5 98 35 135 49.3 99 35 145 42.6 100 35 155 41.1 101 35 165 44.6 102 35 175 42.5 103 35 185 43.9 104 35 195 45.7 105 35 205 47.3 106 35 215 48.9 107 35 225 51.1 108 35 235 48.8 109 35 245 49.6 112 35 275 47.7 113 35 285 57.4 114 35 295 56.2 115 35 305 52.6 116 35 315 52.6 117 35 325 49.2 118 35 335 50.9 119 35 345 51.0 120 35 355 49.4 124 25 35 45.3 125 25 45 47.2 126 25 55 44.6 127 25 65 38.5 132 25 115 55.3 133 25 125 52.5 134 25 135 42.8 135 25 145 41.0 136 25 155 44.4 137 25 165 42.3 138 25 175 42.6 139 25 185 41.5 140 25 195 40.6 141 25 205 40.9 142 25 215 48.2 143 25 225 49.6 144 25 235 50.5 145 25 245 46.7 146 25 255 49.4 147 25 265 53.7 148 25 275 44.3 149 25 285 45.3 150 25 295 43.4 151 25 305 42.2 152 25 315 43.4 153 25 325 44.1 154 25 335 46.9 155 25 345 48.3 160 15 35 48.9 161 15 45 46.5 162 15 55 39.5 163 15 65 37.1 164 15 75 37.6 165 15 85 38.9 166 15 95 33.6 167 15 105 53.5 168 15 115 43.9 169 15 125 39.0 170 15 135 39.1 171 15 145 34.2 172 15 155 34.7 173 15 165 36.8 174 15 175 38.3 175 15 185 35.5 176 15 195 37.5 177 15 205 41.7 178 15 215 47.1 179 15 225 47.8 180 15 235 51.7 181 15 245 46.6 182 15 255 42.2 183 15 265 33.7 184 15 275 35.0 185 15 285 36.5 186 15 295 36.8 187 15 305 39.9 188 15 315 43.4 189 15 325 49.3 190 15 335 56.6 191 15 345 55.9 193 5 5 51.8 197 5 45 46.1 198 5 55 43.6 199 5 65 40.7 200 5 75 45.5 201 5 85 47.5 202 5 95 50.4 203 5 105 52.9 204 5 115 52.8 205 5 125 43.7 206 5 135 50.3 207 5 145 40.5 208 5 155 42.1 209 5 165 54.6 210 5 175 48.3 211 5 185 44.2 212 5 195 48.0 213 5 205 51.8 214 5 215 45.6 215 5 225 46.1 216 5 235 48.3 217 5 245 51.7 218 5 255 46.4 219 5 265 46.4 220 5 275 45.5 221 5 285 46.8 223 5 305 46.8 224 5 315 50.5 225 5 325 56.5 226 5 335 56.2 227 5 345 54.2 228 5 355 52.3 229 -5 5 59.6 230 -5 15 49.6 233 -5 45 46.2 234 -5 55 43.6 235 -5 65 53.3 236 -5 75 49.4 237 -5 85 51.1 238 -5 95 52.5 239 -5 105 62.7 240 -5 115 63.8 241 -5 125 54.5 242 -5 135 57.3 243 -5 145 55.6 244 -5 155 48.3 245 -5 165 59.9 246 -5 175 57.8 247 -5 185 49.2 248 -5 195 45.1 249 -5 205 41.7 250 -5 215 36.2 251 -5 225 32.7 252 -5 235 43.0 253 -5 245 47.9 254 -5 255 53.9 255 -5 265 51.1 256 -5 275 58.6 257 -5 285 46.1 260 -5 315 48.3 261 -5 325 42.1 262 -5 335 44.1 263 -5 345 54.2 264 -5 355 52.1 265 -15 5 57.5 266 -15 15 62.9 268 -15 35 48.3 269 -15 45 48.3 270 -15 55 47.4 271 -15 65 44.3 272 -15 75 42.2 273 -15 85 42.0 274 -15 95 44.5 275 -15 105 47.4 276 -15 115 43.0 277 -15 125 50.4 278 -15 135 54.8 279 -15 145 52.3 280 -15 155 43.5 281 -15 165 43.0 282 -15 175 47.2 283 -15 185 50.1 284 -15 195 54.3 285 -15 205 49.5 286 -15 215 37.9 287 -15 225 39.0 288 -15 235 43.2 289 -15 245 46.8 290 -15 255 49.2 291 -15 265 46.2 292 -15 275 53.8 293 -15 285 47.9 297 -15 325 44.2 298 -15 335 39.9 299 -15 345 46.9 300 -15 355 51.8 301 -25 5 50.3 302 -25 15 48.5 304 -25 35 46.5 305 -25 45 43.9 306 -25 55 45.6 307 -25 65 43.3 308 -25 75 44.7 309 -25 85 43.7 310 -25 95 46.0 311 -25 105 44.0 312 -25 115 35.7 316 -25 155 46.2 317 -25 165 40.8 318 -25 175 44.8 319 -25 185 46.9 320 -25 195 52.6 321 -25 205 55.7 322 -25 215 52.6 323 -25 225 46.1 324 -25 235 42.6 325 -25 245 41.1 326 -25 255 36.7 327 -25 265 49.7 328 -25 275 50.3 329 -25 285 50.5 332 -25 315 51.8 333 -25 325 44.2 334 -25 335 41.0 335 -25 345 42.2 336 -25 355 44.5 337 -35 5 45.8 338 -35 15 36.8 339 -35 25 41.2 340 -35 35 46.7 341 -35 45 47.7 342 -35 55 49.7 343 -35 65 49.2 344 -35 75 46.2 345 -35 85 52.8 346 -35 95 50.2 347 -35 105 45.0 348 -35 115 41.9 349 -35 125 51.3 350 -35 135 49.7 351 -35 145 44.0 352 -35 155 44.5 353 -35 165 46.9 354 -35 175 43.2 355 -35 185 46.7 356 -35 195 48.5 357 -35 205 48.8 358 -35 215 49.8 359 -35 225 57.1 360 -35 235 39.9 363 -35 265 54.5 364 -35 275 48.3 365 -35 285 41.8 367 -35 305 44.0 368 -35 315 49.9 369 -35 325 50.8 370 -35 335 49.9 371 -35 345 48.0 372 -35 355 46.1 373 -45 5 52.3 374 -45 15 57.1 375 -45 25 55.4 376 -45 35 57.5 377 -45 45 55.9 378 -45 55 54.9 379 -45 65 63.3 380 -45 75 66.5 381 -45 85 59.1 382 -45 95 56.7 383 -45 105 50.6 384 -45 115 52.2 385 -45 125 48.6 386 -45 135 58.1 387 -45 145 49.5 388 -45 155 46.6 389 -45 165 55.5 390 -45 175 48.8 391 -45 185 51.5 392 -45 195 51.2 393 -45 205 53.3 400 -45 275 52.1 401 -45 285 44.7 402 -45 295 42.5 403 -45 305 48.1 404 -45 315 49.8 405 -45 325 58.5 406 -45 335 61.3 407 -45 345 56.5 408 -45 355 53.7 409 -55 10 65.7 410 -55 30 68.8 411 -55 50 75.0 412 -55 70 64.4 413 -55 90 69.2 414 -55 110 59.0 415 -55 130 53.5 416 -55 150 52.4 417 -55 170 67.7 418 -55 190 52.4 419 -55 210 64.1 422 -55 270 45.8 423 -55 290 50.1 424 -55 310 66.2 425 -55 330 72.5 426 -55 350 64.5 427 -65 10 62.2 428 -65 30 48.2 429 -65 50 58.6 430 -65 70 67.5 431 -65 90 68.6 432 -65 110 55.9 433 -65 130 70.6 434 -65 150 68.3 435 -65 170 66.5 436 -65 190 68.4 437 -65 210 73.1 438 -65 230 70.8 439 -65 250 75.4 440 -65 270 64.3 441 -65 290 58.0 442 -65 310 79.3 443 -65 330 66.7 444 -65 350 61.6 449 -75 180 51.9 450 -75 220 60.4 452 -75 300 63.2 453 -75 340 59.1