Altocumulus Average Cloud Amount (%) October (1954 - 1997) Night, Ship Observations Only Global Average: 16.3 Zonal Averages 16 zones Lat.N Average 85 16.8 75 12.8 65 13.2 55 13.6 45 14.5 35 15.3 25 12.5 15 14.0 5 20.6 -5 16.2 -15 16.9 -25 18.2 -35 17.9 -45 17.5 -55 19.6 -65 10.2 Grid Box Averages 317 filled boxes Box # Lat.N Lon.E Average 1 85 60 22.5 2 85 180 14.0 3 85 300 13.2 4 75 20 15.3 5 75 60 10.5 6 75 100 9.6 8 75 180 15.1 9 75 220 11.4 10 75 260 14.7 11 75 300 15.2 12 75 340 9.8 13 65 10 15.9 14 65 30 10.9 15 65 50 11.4 21 65 170 6.9 22 65 190 7.1 26 65 270 15.8 27 65 290 12.8 28 65 310 12.3 29 65 330 16.9 30 65 350 14.1 31 55 10 15.6 32 55 30 13.9 38 55 150 9.9 39 55 170 12.4 40 55 190 12.9 41 55 210 12.1 42 55 230 12.6 45 55 290 22.8 46 55 310 14.0 47 55 330 16.3 48 55 350 14.9 49 45 5 15.9 50 45 15 14.2 51 45 25 14.2 52 45 35 4.9 54 45 55 5.9 62 45 135 7.9 63 45 145 8.5 64 45 155 11.6 65 45 165 13.4 66 45 175 14.6 67 45 185 15.5 68 45 195 14.8 69 45 205 13.8 70 45 215 16.8 71 45 225 15.7 72 45 235 12.3 77 45 285 12.6 78 45 295 12.6 79 45 305 16.0 80 45 315 16.6 81 45 325 19.1 82 45 335 17.6 83 45 345 15.9 84 45 355 15.8 85 35 5 15.0 86 35 15 11.4 87 35 25 8.6 88 35 35 4.8 97 35 125 16.6 98 35 135 18.8 99 35 145 19.1 100 35 155 16.5 101 35 165 17.5 102 35 175 17.2 103 35 185 18.2 104 35 195 16.6 105 35 205 15.3 106 35 215 17.1 107 35 225 14.3 108 35 235 10.3 109 35 245 9.1 112 35 275 14.5 113 35 285 14.9 114 35 295 15.9 115 35 305 15.6 116 35 315 15.2 117 35 325 14.6 118 35 335 16.2 119 35 345 12.4 120 35 355 11.4 124 25 35 3.6 125 25 45 2.6 126 25 55 1.3 127 25 65 1.2 129 25 85 14.9 132 25 115 15.1 133 25 125 14.3 134 25 135 15.5 135 25 145 11.4 136 25 155 10.2 137 25 165 10.1 138 25 175 10.2 139 25 185 13.2 140 25 195 13.0 141 25 205 13.0 142 25 215 14.2 143 25 225 19.5 144 25 235 18.9 145 25 245 9.7 146 25 255 10.8 147 25 265 13.4 148 25 275 14.8 149 25 285 14.4 150 25 295 11.8 151 25 305 11.4 152 25 315 12.4 153 25 325 10.9 154 25 335 10.9 155 25 345 9.9 160 15 35 2.6 161 15 45 4.3 162 15 55 4.5 163 15 65 6.0 164 15 75 14.4 165 15 85 13.2 166 15 95 18.0 167 15 105 20.0 168 15 115 13.9 169 15 125 13.9 170 15 135 15.9 171 15 145 12.6 172 15 155 11.6 173 15 165 13.4 174 15 175 12.4 175 15 185 11.0 176 15 195 15.3 177 15 205 14.2 178 15 215 15.7 179 15 225 18.7 180 15 235 19.3 181 15 245 14.9 182 15 255 16.3 183 15 265 21.9 184 15 275 21.8 185 15 285 14.7 186 15 295 11.8 187 15 305 11.6 188 15 315 15.1 189 15 325 13.3 190 15 335 12.9 191 15 345 12.6 193 5 5 29.2 197 5 45 6.9 198 5 55 7.1 199 5 65 13.2 200 5 75 20.7 201 5 85 25.9 202 5 95 36.4 203 5 105 25.8 204 5 115 24.3 205 5 125 19.5 206 5 135 22.7 207 5 145 21.4 208 5 155 19.7 209 5 165 18.7 210 5 175 17.7 211 5 185 15.5 212 5 195 17.7 213 5 205 16.2 214 5 215 14.8 215 5 225 20.2 216 5 235 19.1 217 5 245 21.6 218 5 255 16.2 219 5 265 28.5 220 5 275 35.7 221 5 285 32.1 223 5 305 13.9 224 5 315 15.4 225 5 325 20.3 226 5 335 24.6 227 5 345 21.7 228 5 355 25.3 229 -5 5 33.5 230 -5 15 17.6 233 -5 45 8.1 234 -5 55 14.5 235 -5 65 21.0 236 -5 75 22.4 237 -5 85 27.8 238 -5 95 29.5 239 -5 105 22.1 240 -5 115 15.2 241 -5 125 10.8 242 -5 135 11.9 243 -5 145 27.8 244 -5 155 20.6 245 -5 165 23.0 246 -5 175 16.2 247 -5 185 11.8 248 -5 195 8.0 249 -5 205 4.3 250 -5 215 3.6 251 -5 225 2.7 252 -5 235 7.5 253 -5 245 9.8 254 -5 255 15.8 255 -5 265 22.3 256 -5 275 28.2 260 -5 315 8.1 261 -5 325 8.0 262 -5 335 10.4 263 -5 345 16.8 264 -5 355 20.6 265 -15 5 30.2 266 -15 15 31.6 268 -15 35 7.6 269 -15 45 6.3 270 -15 55 16.7 271 -15 65 18.4 272 -15 75 20.9 273 -15 85 21.4 274 -15 95 20.3 275 -15 105 10.8 276 -15 115 6.2 277 -15 125 6.5 278 -15 135 6.8 279 -15 145 11.6 280 -15 155 14.1 281 -15 165 18.3 282 -15 175 21.7 283 -15 185 23.3 284 -15 195 16.4 285 -15 205 14.7 286 -15 215 14.2 287 -15 225 10.3 288 -15 235 14.5 289 -15 245 15.3 290 -15 255 18.8 291 -15 265 18.4 292 -15 275 17.0 293 -15 285 13.5 297 -15 325 15.0 298 -15 335 15.1 299 -15 345 23.0 300 -15 355 26.0 301 -25 5 18.0 302 -25 15 11.8 304 -25 35 12.0 305 -25 45 13.7 306 -25 55 13.7 307 -25 65 17.8 308 -25 75 18.6 309 -25 85 22.0 310 -25 95 20.4 311 -25 105 17.5 312 -25 115 7.5 316 -25 155 10.1 317 -25 165 15.3 318 -25 175 20.9 319 -25 185 21.3 320 -25 195 25.0 321 -25 205 17.5 322 -25 215 24.6 323 -25 225 20.2 324 -25 235 19.5 325 -25 245 10.9 327 -25 265 14.2 328 -25 275 17.0 329 -25 285 10.6 332 -25 315 28.7 333 -25 325 21.8 334 -25 335 22.4 335 -25 345 23.9 336 -25 355 20.6 337 -35 5 22.7 338 -35 15 14.4 339 -35 25 14.6 340 -35 35 15.9 341 -35 45 18.0 342 -35 55 18.6 343 -35 65 18.9 344 -35 75 17.6 345 -35 85 19.5 346 -35 95 20.6 347 -35 105 20.4 348 -35 115 11.9 349 -35 125 12.8 350 -35 135 14.8 351 -35 145 15.2 352 -35 155 15.8 353 -35 165 16.5 354 -35 175 19.3 355 -35 185 18.9 356 -35 195 19.5 357 -35 205 18.2 358 -35 215 18.6 359 -35 225 17.4 364 -35 275 16.0 365 -35 285 12.2 367 -35 305 14.4 368 -35 315 16.3 369 -35 325 17.3 370 -35 335 23.4 371 -35 345 20.8 372 -35 355 22.5 379 -45 65 19.4 380 -45 75 17.4 387 -45 145 14.3 388 -45 155 15.9 389 -45 165 15.3 390 -45 175 18.4 391 -45 185 23.0 392 -45 195 19.0 400 -45 275 12.2 401 -45 285 11.4 402 -45 295 16.3 403 -45 305 23.7 416 -55 150 10.7 417 -55 170 24.6 422 -55 270 9.8 423 -55 290 19.4 424 -55 310 27.3 425 -55 330 26.0 432 -65 110 10.2