Altocumulus Average Cloud Amount (%) February (1954 - 1997) Night, Ship Observations Only Global Average: 16.9 Zonal Averages 17 zones Lat.N Average 85 9.0 75 12.2 65 11.4 55 10.8 45 11.7 35 14.3 25 13.2 15 10.9 5 18.5 -5 20.5 -15 17.8 -25 17.7 -35 17.2 -45 19.0 -55 24.6 -65 21.2 -75 19.3 Grid Box Averages 348 filled boxes Box # Lat.N Lon.E Average 2 85 180 9.0 4 75 20 13.1 5 75 60 10.1 8 75 180 13.3 13 65 10 15.4 14 65 30 13.4 21 65 170 2.7 22 65 190 3.6 29 65 330 12.2 30 65 350 14.6 31 55 10 11.6 32 55 30 17.8 38 55 150 6.1 39 55 170 8.7 40 55 190 8.9 41 55 210 10.7 42 55 230 9.8 46 55 310 10.5 47 55 330 15.7 48 55 350 13.9 49 45 5 14.7 50 45 15 13.8 51 45 25 14.9 52 45 35 11.3 62 45 135 6.3 63 45 145 8.0 64 45 155 8.8 65 45 165 9.1 66 45 175 11.5 67 45 185 10.1 68 45 195 10.9 69 45 205 12.3 70 45 215 12.0 71 45 225 11.1 72 45 235 12.7 77 45 285 8.8 78 45 295 11.6 79 45 305 11.6 80 45 315 13.8 81 45 325 14.7 82 45 335 15.6 83 45 345 13.3 84 45 355 13.2 85 35 5 14.3 86 35 15 13.5 87 35 25 12.6 88 35 35 11.0 97 35 125 11.4 98 35 135 11.5 99 35 145 10.5 100 35 155 13.6 101 35 165 12.7 102 35 175 11.8 103 35 185 14.4 104 35 195 12.4 105 35 205 14.8 106 35 215 15.8 107 35 225 15.9 108 35 235 12.3 109 35 245 9.4 112 35 275 16.1 113 35 285 16.1 114 35 295 17.4 115 35 305 17.9 116 35 315 17.9 117 35 325 15.6 118 35 335 17.2 119 35 345 13.9 120 35 355 13.7 124 25 35 6.1 125 25 45 11.6 126 25 55 6.8 127 25 65 4.0 132 25 115 16.0 133 25 125 16.2 134 25 135 14.7 135 25 145 15.7 136 25 155 13.7 137 25 165 14.1 138 25 175 13.4 139 25 185 12.2 140 25 195 11.0 141 25 205 10.9 142 25 215 15.9 143 25 225 19.1 144 25 235 17.3 145 25 245 10.9 146 25 255 10.5 147 25 265 17.8 148 25 275 14.8 149 25 285 12.4 150 25 295 10.8 151 25 305 11.4 152 25 315 12.3 153 25 325 14.2 154 25 335 10.1 155 25 345 7.9 160 15 35 9.0 161 15 45 7.4 162 15 55 4.6 163 15 65 3.5 164 15 75 3.5 165 15 85 3.7 166 15 95 4.0 167 15 105 11.6 168 15 115 10.0 169 15 125 11.5 170 15 135 13.4 171 15 145 11.4 172 15 155 9.2 173 15 165 7.0 174 15 175 9.3 175 15 185 10.4 176 15 195 10.4 177 15 205 10.2 178 15 215 17.1 179 15 225 23.2 180 15 235 22.4 181 15 245 18.3 182 15 255 9.8 183 15 265 6.7 184 15 275 10.0 185 15 285 7.9 186 15 295 9.3 187 15 305 10.4 188 15 315 14.0 189 15 325 12.7 190 15 335 10.5 191 15 345 10.7 193 5 5 17.1 197 5 45 6.9 198 5 55 8.0 199 5 65 7.1 200 5 75 10.0 201 5 85 16.0 202 5 95 21.5 203 5 105 18.0 204 5 115 18.9 205 5 125 19.6 206 5 135 26.3 207 5 145 20.7 208 5 155 22.6 209 5 165 25.2 210 5 175 23.4 211 5 185 20.1 212 5 195 15.2 213 5 205 20.3 214 5 215 22.3 215 5 225 20.2 216 5 235 22.8 217 5 245 21.6 218 5 255 15.0 219 5 265 15.1 220 5 275 18.2 221 5 285 16.5 223 5 305 15.7 224 5 315 22.6 225 5 325 22.4 226 5 335 18.7 227 5 345 13.8 228 5 355 13.7 229 -5 5 24.6 230 -5 15 19.6 233 -5 45 10.6 234 -5 55 15.4 235 -5 65 23.9 236 -5 75 24.6 237 -5 85 24.0 238 -5 95 30.4 239 -5 105 34.8 240 -5 115 33.5 241 -5 125 27.7 242 -5 135 30.2 243 -5 145 32.4 244 -5 155 25.7 245 -5 165 33.6 246 -5 175 24.7 247 -5 185 20.0 248 -5 195 19.1 249 -5 205 18.1 250 -5 215 8.9 251 -5 225 5.8 252 -5 235 10.0 253 -5 245 16.7 254 -5 255 20.6 255 -5 265 20.1 256 -5 275 30.3 257 -5 285 20.9 260 -5 315 27.3 261 -5 325 15.6 262 -5 335 11.2 263 -5 345 11.6 264 -5 355 10.9 265 -15 5 22.5 266 -15 15 23.5 268 -15 35 15.2 269 -15 45 19.4 270 -15 55 20.3 271 -15 65 17.4 272 -15 75 15.6 273 -15 85 18.0 274 -15 95 21.7 275 -15 105 16.7 276 -15 115 14.6 277 -15 125 16.2 278 -15 135 24.8 279 -15 145 24.3 280 -15 155 18.4 281 -15 165 21.6 282 -15 175 23.4 283 -15 185 25.2 284 -15 195 27.3 285 -15 205 21.0 286 -15 215 12.4 287 -15 225 10.8 288 -15 235 9.7 289 -15 245 15.2 290 -15 255 17.7 291 -15 265 18.0 292 -15 275 18.4 293 -15 285 20.0 297 -15 325 13.2 298 -15 335 11.5 299 -15 345 9.0 300 -15 355 15.6 301 -25 5 19.3 302 -25 15 12.7 304 -25 35 10.4 305 -25 45 14.2 306 -25 55 17.6 307 -25 65 20.2 308 -25 75 21.1 309 -25 85 19.0 310 -25 95 22.1 311 -25 105 18.2 312 -25 115 12.6 316 -25 155 15.2 317 -25 165 16.8 318 -25 175 23.4 319 -25 185 22.5 320 -25 195 24.5 321 -25 205 25.0 322 -25 215 17.8 323 -25 225 9.6 324 -25 235 13.6 325 -25 245 9.6 326 -25 255 9.0 327 -25 265 24.4 328 -25 275 21.8 329 -25 285 17.6 332 -25 315 20.0 333 -25 325 15.9 334 -25 335 15.3 335 -25 345 15.2 336 -25 355 17.4 337 -35 5 18.2 338 -35 15 10.2 339 -35 25 14.1 340 -35 35 14.7 341 -35 45 14.0 342 -35 55 13.9 343 -35 65 15.6 344 -35 75 18.5 345 -35 85 22.8 346 -35 95 22.7 347 -35 105 17.5 348 -35 115 12.7 349 -35 125 21.7 350 -35 135 20.0 351 -35 145 13.6 352 -35 155 16.6 353 -35 165 16.8 354 -35 175 17.1 355 -35 185 22.2 356 -35 195 21.4 357 -35 205 19.7 358 -35 215 19.2 359 -35 225 19.3 363 -35 265 14.6 364 -35 275 12.5 365 -35 285 10.0 367 -35 305 13.5 368 -35 315 15.8 369 -35 325 22.3 370 -35 335 13.2 371 -35 345 18.5 372 -35 355 19.1 374 -45 15 19.2 375 -45 25 19.7 376 -45 35 19.8 377 -45 45 17.7 378 -45 55 18.7 379 -45 65 24.7 380 -45 75 22.5 381 -45 85 21.1 382 -45 95 25.1 383 -45 105 21.5 387 -45 145 17.8 388 -45 155 19.6 389 -45 165 18.6 390 -45 175 17.6 391 -45 185 20.9 392 -45 195 17.8 393 -45 205 20.0 400 -45 275 15.0 401 -45 285 14.4 402 -45 295 12.0 403 -45 305 16.5 404 -45 315 11.6 409 -55 10 27.9 410 -55 30 24.1 411 -55 50 33.8 412 -55 70 23.4 413 -55 90 26.2 414 -55 110 23.4 415 -55 130 26.6 416 -55 150 17.7 417 -55 170 25.5 418 -55 190 22.1 419 -55 210 37.6 422 -55 270 16.2 423 -55 290 21.9 424 -55 310 24.3 425 -55 330 16.7 426 -55 350 25.0 427 -65 10 18.7 428 -65 30 27.6 429 -65 50 20.1 430 -65 70 18.1 431 -65 90 17.6 432 -65 110 18.0 433 -65 130 18.1 434 -65 150 16.6 435 -65 170 19.6 436 -65 190 23.6 437 -65 210 28.1 438 -65 230 16.9 439 -65 250 21.2 440 -65 270 15.9 441 -65 290 24.2 442 -65 310 33.0 443 -65 330 12.8 444 -65 350 27.5 449 -75 180 18.9 450 -75 220 19.3 451 -75 260 24.3 452 -75 300 15.3 453 -75 340 19.5