High Level (Cirriform) Average Cloud Amount (%) September, October, November (1954 - 1997) Day, Ship Observations Only Global Average: 13.1 Zonal Averages 17 zones Lat.N Average 85 18.6 75 18.4 65 15.3 55 14.3 45 13.1 35 12.4 25 10.5 15 14.7 5 16.2 -5 12.4 -15 9.1 -25 9.8 -35 12.0 -45 13.3 -55 14.6 -65 18.1 -75 19.0 Grid Box Averages 385 filled boxes Box # Lat.N Lon.E Average 1 85 60 12.0 2 85 180 27.6 3 85 300 14.5 4 75 20 11.9 5 75 60 12.3 6 75 100 12.6 7 75 140 20.1 8 75 180 26.1 9 75 220 24.7 10 75 260 20.6 11 75 300 17.6 12 75 340 14.5 13 65 10 12.9 14 65 30 11.7 15 65 50 11.8 16 65 70 13.9 20 65 150 11.7 21 65 170 10.7 22 65 190 13.4 23 65 210 18.6 25 65 250 24.4 26 65 270 21.2 27 65 290 22.3 28 65 310 14.3 29 65 330 14.7 30 65 350 14.7 31 55 10 15.4 32 55 30 15.0 37 55 130 9.5 38 55 150 11.5 39 55 170 12.6 40 55 190 12.8 41 55 210 14.5 42 55 230 15.2 44 55 270 20.1 45 55 290 20.2 46 55 310 14.4 47 55 330 14.7 48 55 350 16.2 49 45 5 15.0 50 45 15 13.6 51 45 25 10.0 52 45 35 8.0 53 45 45 8.8 54 45 55 8.6 61 45 125 8.9 62 45 135 10.2 63 45 145 11.2 64 45 155 12.2 65 45 165 11.5 66 45 175 11.6 67 45 185 12.7 68 45 195 12.7 69 45 205 12.7 70 45 215 14.0 71 45 225 14.4 72 45 235 13.4 77 45 285 14.4 78 45 295 14.5 79 45 305 15.0 80 45 315 16.1 81 45 325 14.0 82 45 335 13.4 83 45 345 13.2 84 45 355 13.9 85 35 5 12.7 86 35 15 10.5 87 35 25 7.7 88 35 35 6.9 89 35 45 7.6 90 35 55 10.0 96 35 115 10.1 97 35 125 10.5 98 35 135 13.4 99 35 145 13.1 100 35 155 13.0 101 35 165 15.2 102 35 175 12.9 103 35 185 13.3 104 35 195 13.6 105 35 205 12.8 106 35 215 11.5 107 35 225 11.7 108 35 235 9.8 109 35 245 10.3 112 35 275 15.7 113 35 285 14.3 114 35 295 14.0 115 35 305 13.1 116 35 315 14.0 117 35 325 12.1 118 35 335 12.1 119 35 345 10.8 120 35 355 12.6 124 25 35 5.8 125 25 45 7.8 126 25 55 5.0 127 25 65 5.3 128 25 75 9.9 129 25 85 14.5 130 25 95 15.2 131 25 105 15.2 132 25 115 12.6 133 25 125 11.7 134 25 135 11.3 135 25 145 10.7 136 25 155 10.1 137 25 165 9.8 138 25 175 10.1 139 25 185 10.5 140 25 195 10.2 141 25 205 9.8 142 25 215 9.0 143 25 225 10.1 144 25 235 8.7 145 25 245 9.5 146 25 255 12.5 147 25 265 12.8 148 25 275 13.4 149 25 285 12.9 150 25 295 12.2 151 25 305 11.6 152 25 315 10.7 153 25 325 10.1 154 25 335 10.5 155 25 345 11.4 156 25 355 13.8 160 15 35 6.7 161 15 45 5.8 162 15 55 6.1 163 15 65 9.8 164 15 75 17.7 165 15 85 17.4 166 15 95 19.1 167 15 105 21.1 168 15 115 17.5 169 15 125 17.3 170 15 135 16.6 171 15 145 15.1 172 15 155 15.4 173 15 165 13.6 174 15 175 13.2 175 15 185 14.3 176 15 195 14.9 177 15 205 14.0 178 15 215 12.3 179 15 225 13.9 180 15 235 12.4 181 15 245 13.5 182 15 255 15.9 183 15 265 17.7 184 15 275 18.2 185 15 285 17.0 186 15 295 13.3 187 15 305 12.7 188 15 315 13.4 189 15 325 15.9 190 15 335 16.6 191 15 345 19.2 193 5 5 14.8 197 5 45 6.7 198 5 55 8.1 199 5 65 14.3 200 5 75 20.4 201 5 85 22.8 202 5 95 28.0 203 5 105 26.3 204 5 115 26.3 205 5 125 22.8 206 5 135 23.2 207 5 145 18.6 208 5 155 18.7 209 5 165 21.7 210 5 175 19.7 211 5 185 15.7 212 5 195 14.9 213 5 205 13.1 214 5 215 14.1 215 5 225 9.6 216 5 235 8.4 217 5 245 11.0 218 5 255 13.1 219 5 265 13.0 220 5 275 20.9 221 5 285 25.7 222 5 295 10.2 223 5 305 13.0 224 5 315 10.7 225 5 325 10.2 226 5 335 13.5 227 5 345 15.6 228 5 355 10.9 229 -5 5 9.7 230 -5 15 11.6 232 -5 35 9.2 233 -5 45 5.9 234 -5 55 10.4 235 -5 65 17.5 236 -5 75 19.3 237 -5 85 24.9 238 -5 95 25.3 239 -5 105 27.3 240 -5 115 21.3 241 -5 125 17.3 242 -5 135 17.7 243 -5 145 22.7 244 -5 155 21.4 245 -5 165 18.9 246 -5 175 18.4 247 -5 185 15.0 248 -5 195 12.6 249 -5 205 11.5 250 -5 215 7.3 251 -5 225 3.3 252 -5 235 2.7 253 -5 245 3.5 254 -5 255 4.0 255 -5 265 4.6 256 -5 275 11.9 257 -5 285 19.9 260 -5 315 8.6 261 -5 325 6.6 262 -5 335 5.6 263 -5 345 4.5 264 -5 355 4.9 265 -15 5 5.5 266 -15 15 7.6 268 -15 35 6.8 269 -15 45 6.0 270 -15 55 6.9 271 -15 65 9.2 272 -15 75 12.2 273 -15 85 12.6 274 -15 95 12.6 275 -15 105 9.3 276 -15 115 6.8 277 -15 125 8.9 278 -15 135 15.2 279 -15 145 10.5 280 -15 155 10.1 281 -15 165 12.8 282 -15 175 12.9 283 -15 185 15.0 284 -15 195 14.2 285 -15 205 11.8 286 -15 215 8.5 287 -15 225 6.2 288 -15 235 5.9 289 -15 245 5.4 290 -15 255 4.5 291 -15 265 5.2 292 -15 275 7.6 293 -15 285 12.6 297 -15 325 10.2 298 -15 335 7.8 299 -15 345 7.5 300 -15 355 6.5 301 -25 5 6.6 302 -25 15 7.2 304 -25 35 8.5 305 -25 45 7.7 306 -25 55 7.1 307 -25 65 7.0 308 -25 75 5.5 309 -25 85 6.0 310 -25 95 6.1 311 -25 105 6.0 312 -25 115 4.8 315 -25 145 4.5 316 -25 155 6.7 317 -25 165 8.2 318 -25 175 9.9 319 -25 185 12.7 320 -25 195 13.2 321 -25 205 14.9 322 -25 215 14.5 323 -25 225 15.5 324 -25 235 14.3 325 -25 245 11.2 326 -25 255 11.3 327 -25 265 9.2 328 -25 275 6.9 329 -25 285 6.7 332 -25 315 16.5 333 -25 325 14.3 334 -25 335 12.3 335 -25 345 11.2 336 -25 355 9.7 337 -35 5 12.9 338 -35 15 9.9 339 -35 25 12.3 340 -35 35 10.8 341 -35 45 9.7 342 -35 55 9.8 343 -35 65 11.0 344 -35 75 10.6 345 -35 85 9.6 346 -35 95 8.6 347 -35 105 8.8 348 -35 115 10.3 349 -35 125 12.2 350 -35 135 13.3 351 -35 145 13.9 352 -35 155 12.0 353 -35 165 11.0 354 -35 175 11.6 355 -35 185 12.2 356 -35 195 12.9 357 -35 205 13.0 358 -35 215 14.4 359 -35 225 14.4 360 -35 235 16.0 361 -35 245 10.4 362 -35 255 16.8 363 -35 265 15.5 364 -35 275 9.3 365 -35 285 8.7 366 -35 295 17.6 367 -35 305 14.2 368 -35 315 12.7 369 -35 325 11.3 370 -35 335 13.0 371 -35 345 14.0 372 -35 355 14.7 373 -45 5 13.9 374 -45 15 11.0 375 -45 25 12.7 376 -45 35 11.3 377 -45 45 11.3 378 -45 55 11.1 379 -45 65 11.4 380 -45 75 10.1 381 -45 85 11.1 382 -45 95 10.8 383 -45 105 10.0 384 -45 115 11.7 385 -45 125 10.5 386 -45 135 18.1 387 -45 145 18.1 388 -45 155 14.7 389 -45 165 12.7 390 -45 175 13.9 391 -45 185 14.9 392 -45 195 13.8 393 -45 205 11.4 394 -45 215 12.8 395 -45 225 15.6 396 -45 235 12.6 397 -45 245 27.7 400 -45 275 10.3 401 -45 285 11.7 402 -45 295 17.0 403 -45 305 17.3 404 -45 315 14.7 405 -45 325 12.1 406 -45 335 6.5 407 -45 345 15.2 408 -45 355 15.8 409 -55 10 9.9 410 -55 30 6.7 411 -55 50 10.8 412 -55 70 14.1 413 -55 90 19.0 414 -55 110 20.6 415 -55 130 20.4 416 -55 150 17.0 417 -55 170 13.6 418 -55 190 12.6 419 -55 210 20.0 420 -55 230 12.8 421 -55 250 16.1 422 -55 270 11.6 423 -55 290 20.0 424 -55 310 15.9 425 -55 330 10.7 426 -55 350 12.4 429 -65 50 16.8 430 -65 70 18.3 432 -65 110 14.8 433 -65 130 19.9 435 -65 170 18.2 441 -65 290 20.9 442 -65 310 17.0 449 -75 180 20.1 453 -75 340 17.3