Altocumulus Average Cloud Amount (%) February (1954 - 1997) , Ship Observations Only Global Average: 17.2 Zonal Averages 17 zones Lat.N Average 85 13.1 75 13.8 65 13.5 55 12.1 45 12.8 35 15.6 25 13.6 15 11.0 5 18.4 -5 20.2 -15 17.9 -25 17.4 -35 17.3 -45 18.9 -55 24.2 -65 21.5 -75 18.3 Grid Box Averages 380 filled boxes Box # Lat.N Lon.E Average 1 85 60 13.8 2 85 180 10.6 3 85 300 15.7 4 75 20 15.3 5 75 60 13.3 7 75 140 10.7 8 75 180 13.2 9 75 220 14.5 12 75 340 16.7 13 65 10 18.2 14 65 30 14.0 15 65 50 14.6 21 65 170 4.0 22 65 190 3.8 23 65 210 11.0 29 65 330 15.0 30 65 350 17.4 31 55 10 14.0 32 55 30 18.9 38 55 150 7.6 39 55 170 9.7 40 55 190 9.7 41 55 210 12.0 42 55 230 12.1 46 55 310 11.4 47 55 330 16.7 48 55 350 16.3 49 45 5 15.6 50 45 15 14.9 51 45 25 14.0 52 45 35 11.5 53 45 45 9.7 54 45 55 8.3 62 45 135 6.9 63 45 145 8.3 64 45 155 8.9 65 45 165 9.8 66 45 175 11.6 67 45 185 10.8 68 45 195 11.6 69 45 205 12.9 70 45 215 13.6 71 45 225 14.2 72 45 235 14.5 77 45 285 9.9 78 45 295 12.2 79 45 305 13.0 80 45 315 15.4 81 45 325 15.8 82 45 335 17.2 83 45 345 15.6 84 45 355 15.0 85 35 5 15.7 86 35 15 15.0 87 35 25 14.2 88 35 35 12.6 90 35 55 12.6 96 35 115 5.0 97 35 125 13.1 98 35 135 12.7 99 35 145 11.5 100 35 155 14.1 101 35 165 13.3 102 35 175 13.2 103 35 185 14.7 104 35 195 14.1 105 35 205 16.7 106 35 215 17.4 107 35 225 17.4 108 35 235 13.9 109 35 245 10.3 112 35 275 15.7 113 35 285 17.6 114 35 295 19.1 115 35 305 19.1 116 35 315 19.1 117 35 325 17.6 118 35 335 18.5 119 35 345 14.7 120 35 355 14.8 124 25 35 6.2 125 25 45 12.2 126 25 55 7.5 127 25 65 4.2 128 25 75 1.7 129 25 85 4.9 130 25 95 5.4 132 25 115 17.7 133 25 125 16.6 134 25 135 14.6 135 25 145 15.3 136 25 155 14.0 137 25 165 13.9 138 25 175 13.2 139 25 185 12.1 140 25 195 11.7 141 25 205 12.2 142 25 215 16.4 143 25 225 19.3 144 25 235 17.2 145 25 245 12.4 146 25 255 11.5 147 25 265 18.3 148 25 275 14.9 149 25 285 13.1 150 25 295 11.7 151 25 305 12.2 152 25 315 13.2 153 25 325 14.6 154 25 335 10.5 155 25 345 8.2 160 15 35 9.7 161 15 45 7.9 162 15 55 4.7 163 15 65 3.5 164 15 75 3.4 165 15 85 3.8 166 15 95 4.7 167 15 105 12.1 168 15 115 10.6 169 15 125 12.0 170 15 135 12.9 171 15 145 11.3 172 15 155 9.6 173 15 165 8.1 174 15 175 9.7 175 15 185 10.5 176 15 195 11.0 177 15 205 11.7 178 15 215 16.5 179 15 225 21.5 180 15 235 22.6 181 15 245 17.2 182 15 255 9.2 183 15 265 5.8 184 15 275 9.3 185 15 285 8.3 186 15 295 9.9 187 15 305 10.8 188 15 315 13.2 189 15 325 12.8 190 15 335 10.8 191 15 345 9.8 193 5 5 17.4 197 5 45 6.1 198 5 55 7.7 199 5 65 7.0 200 5 75 9.9 201 5 85 16.6 202 5 95 21.5 203 5 105 19.1 204 5 115 21.1 205 5 125 21.5 206 5 135 25.4 207 5 145 21.6 208 5 155 22.8 209 5 165 25.5 210 5 175 22.2 211 5 185 18.0 212 5 195 16.2 213 5 205 20.0 214 5 215 21.4 215 5 225 19.9 216 5 235 21.3 217 5 245 19.6 218 5 255 14.7 219 5 265 15.2 220 5 275 16.4 221 5 285 16.9 223 5 305 16.5 224 5 315 23.2 225 5 325 23.4 226 5 335 18.4 227 5 345 13.8 228 5 355 14.6 229 -5 5 21.7 230 -5 15 21.7 232 -5 35 9.8 233 -5 45 11.4 234 -5 55 14.4 235 -5 65 21.3 236 -5 75 24.9 237 -5 85 24.3 238 -5 95 28.8 239 -5 105 35.1 240 -5 115 35.8 241 -5 125 29.6 242 -5 135 32.3 243 -5 145 34.0 244 -5 155 28.6 245 -5 165 34.5 246 -5 175 28.5 247 -5 185 18.7 248 -5 195 17.9 249 -5 205 15.7 250 -5 215 10.3 251 -5 225 7.3 252 -5 235 10.1 253 -5 245 14.0 254 -5 255 17.7 255 -5 265 18.6 256 -5 275 25.1 257 -5 285 19.5 260 -5 315 28.0 261 -5 325 16.2 262 -5 335 11.6 263 -5 345 9.5 264 -5 355 10.4 265 -15 5 19.2 266 -15 15 24.3 268 -15 35 16.3 269 -15 45 22.0 270 -15 55 19.3 271 -15 65 17.5 272 -15 75 17.4 273 -15 85 18.2 274 -15 95 20.2 275 -15 105 17.0 276 -15 115 15.4 277 -15 125 21.0 278 -15 135 27.4 279 -15 145 25.8 280 -15 155 20.2 281 -15 165 21.9 282 -15 175 23.8 283 -15 185 26.5 284 -15 195 25.6 285 -15 205 21.5 286 -15 215 14.4 287 -15 225 13.3 288 -15 235 11.2 289 -15 245 14.4 290 -15 255 16.2 291 -15 265 16.1 292 -15 275 16.5 293 -15 285 19.5 297 -15 325 13.7 298 -15 335 10.2 299 -15 345 9.0 300 -15 355 13.9 301 -25 5 15.8 302 -25 15 14.5 304 -25 35 11.9 305 -25 45 14.1 306 -25 55 17.2 307 -25 65 18.2 308 -25 75 18.9 309 -25 85 16.8 310 -25 95 19.6 311 -25 105 17.8 312 -25 115 12.1 315 -25 145 12.7 316 -25 155 16.0 317 -25 165 17.8 318 -25 175 21.8 319 -25 185 23.2 320 -25 195 23.1 321 -25 205 24.8 322 -25 215 18.8 323 -25 225 13.1 324 -25 235 15.9 325 -25 245 11.8 326 -25 255 11.8 327 -25 265 19.8 328 -25 275 18.4 329 -25 285 19.7 332 -25 315 20.4 333 -25 325 16.1 334 -25 335 14.8 335 -25 345 13.8 336 -25 355 16.4 337 -35 5 17.3 338 -35 15 10.3 339 -35 25 14.3 340 -35 35 15.3 341 -35 45 16.1 342 -35 55 16.1 343 -35 65 17.3 344 -35 75 19.2 345 -35 85 22.1 346 -35 95 21.2 347 -35 105 18.4 348 -35 115 13.2 349 -35 125 20.7 350 -35 135 19.1 351 -35 145 14.2 352 -35 155 16.2 353 -35 165 17.6 354 -35 175 18.4 355 -35 185 20.9 356 -35 195 21.9 357 -35 205 20.3 358 -35 215 20.9 359 -35 225 21.6 360 -35 235 17.2 361 -35 245 13.3 362 -35 255 13.2 363 -35 265 13.2 364 -35 275 12.5 365 -35 285 10.8 367 -35 305 13.3 368 -35 315 16.2 369 -35 325 22.4 370 -35 335 17.0 371 -35 345 17.9 372 -35 355 18.8 373 -45 5 23.0 374 -45 15 21.4 375 -45 25 20.1 376 -45 35 21.2 377 -45 45 18.8 378 -45 55 20.4 379 -45 65 22.5 380 -45 75 22.7 381 -45 85 22.2 382 -45 95 19.9 383 -45 105 20.5 384 -45 115 17.7 385 -45 125 20.9 386 -45 135 28.7 387 -45 145 18.9 388 -45 155 18.6 389 -45 165 17.5 390 -45 175 18.1 391 -45 185 20.8 392 -45 195 18.5 393 -45 205 18.5 394 -45 215 17.4 395 -45 225 14.9 396 -45 235 14.5 399 -45 265 18.5 400 -45 275 13.2 401 -45 285 15.1 402 -45 295 12.9 403 -45 305 15.6 404 -45 315 15.1 405 -45 325 17.5 406 -45 335 14.1 407 -45 345 20.0 408 -45 355 17.9 409 -55 10 29.4 410 -55 30 23.9 411 -55 50 39.3 412 -55 70 22.9 413 -55 90 25.5 414 -55 110 21.7 415 -55 130 24.4 416 -55 150 18.6 417 -55 170 23.3 418 -55 190 20.9 419 -55 210 32.1 421 -55 250 14.8 422 -55 270 17.3 423 -55 290 23.1 424 -55 310 25.3 425 -55 330 20.7 426 -55 350 27.7 427 -65 10 20.3 428 -65 30 26.9 429 -65 50 20.7 430 -65 70 18.5 431 -65 90 17.3 432 -65 110 16.7 433 -65 130 19.8 434 -65 150 18.7 435 -65 170 18.8 436 -65 190 21.4 437 -65 210 25.3 438 -65 230 17.6 439 -65 250 23.3 440 -65 270 18.3 441 -65 290 23.6 442 -65 310 33.3 443 -65 330 16.2 444 -65 350 26.3 449 -75 180 18.6 450 -75 220 15.8 451 -75 260 21.7 452 -75 300 17.3 453 -75 340 19.3