Altocumulus Average Cloud Amount (%) June (1954 - 1997) Night, Ship Observations Only Global Average: 16.3 Zonal Averages 15 zones Lat.N Average 85 11.6 75 16.3 65 20.2 55 18.1 45 17.6 35 17.4 25 14.0 15 17.5 5 23.8 -5 15.3 -15 15.6 -25 15.4 -35 14.6 -45 13.2 -55 13.7 Grid Box Averages 312 filled boxes Box # Lat.N Lon.E Average 1 85 60 15.4 2 85 180 10.8 3 85 300 7.6 4 75 20 22.4 5 75 60 17.4 8 75 180 15.4 9 75 220 6.1 10 75 260 17.7 11 75 300 19.9 12 75 340 20.3 13 65 10 21.8 14 65 30 16.7 15 65 50 15.9 20 65 150 11.4 21 65 170 11.8 22 65 190 17.0 23 65 210 18.9 28 65 310 19.8 29 65 330 22.9 30 65 350 22.5 31 55 10 18.7 32 55 30 15.2 37 55 130 7.3 38 55 150 13.3 39 55 170 14.8 40 55 190 18.9 41 55 210 19.3 42 55 230 20.1 46 55 310 17.0 47 55 330 21.2 48 55 350 21.2 49 45 5 12.0 50 45 15 11.4 51 45 25 11.2 52 45 35 8.8 53 45 45 12.7 54 45 55 9.9 62 45 135 12.6 63 45 145 11.4 64 45 155 13.2 65 45 165 13.9 66 45 175 17.2 67 45 185 18.9 68 45 195 19.8 69 45 205 22.5 70 45 215 21.6 71 45 225 20.4 72 45 235 13.3 77 45 285 15.4 78 45 295 16.4 79 45 305 18.0 80 45 315 19.1 81 45 325 18.8 82 45 335 21.9 83 45 345 19.3 84 45 355 17.8 85 35 5 11.4 86 35 15 7.5 87 35 25 4.2 88 35 35 3.1 96 35 115 13.5 97 35 125 22.6 98 35 135 22.4 99 35 145 18.4 100 35 155 17.5 101 35 165 21.8 102 35 175 21.1 103 35 185 24.4 104 35 195 23.0 105 35 205 21.8 106 35 215 21.3 107 35 225 15.6 108 35 235 8.5 109 35 245 5.2 112 35 275 16.0 113 35 285 17.9 114 35 295 18.3 115 35 305 16.0 116 35 315 16.2 117 35 325 16.8 118 35 335 17.6 119 35 345 14.0 120 35 355 10.6 124 25 35 2.6 125 25 45 5.4 126 25 55 4.3 127 25 65 9.1 131 25 105 11.2 132 25 115 20.4 133 25 125 19.4 134 25 135 21.8 135 25 145 13.6 136 25 155 13.5 137 25 165 14.3 138 25 175 14.0 139 25 185 11.2 140 25 195 10.2 141 25 205 11.6 142 25 215 16.7 143 25 225 21.0 144 25 235 15.4 145 25 245 10.6 146 25 255 15.3 147 25 265 11.9 148 25 275 14.8 149 25 285 18.6 150 25 295 16.0 151 25 305 11.8 152 25 315 10.8 153 25 325 13.0 154 25 335 10.4 155 25 345 9.3 160 15 35 8.2 161 15 45 11.0 162 15 55 11.1 163 15 65 13.6 164 15 75 24.6 165 15 85 26.3 166 15 95 33.6 167 15 105 25.4 168 15 115 19.5 169 15 125 15.6 170 15 135 13.6 171 15 145 11.4 172 15 155 10.9 173 15 165 9.9 174 15 175 13.0 175 15 185 14.6 176 15 195 13.6 177 15 205 15.2 178 15 215 16.0 179 15 225 20.3 180 15 235 27.2 181 15 245 22.7 182 15 255 25.6 183 15 265 32.6 184 15 275 25.7 185 15 285 17.6 186 15 295 12.1 187 15 305 11.1 188 15 315 14.5 189 15 325 20.0 190 15 335 17.4 191 15 345 13.8 193 5 5 31.8 197 5 45 10.4 198 5 55 9.9 199 5 65 16.3 200 5 75 24.1 201 5 85 25.5 202 5 95 36.4 203 5 105 27.8 204 5 115 23.9 205 5 125 26.7 206 5 135 40.9 207 5 145 21.3 208 5 155 21.0 209 5 165 17.9 210 5 175 26.3 211 5 185 24.9 212 5 195 25.1 213 5 205 20.9 214 5 215 18.8 215 5 225 15.5 216 5 235 18.0 217 5 245 18.8 218 5 255 25.0 219 5 265 30.1 220 5 275 38.0 221 5 285 36.0 223 5 305 21.1 224 5 315 23.8 225 5 325 20.1 226 5 335 24.1 227 5 345 24.6 228 5 355 26.5 229 -5 5 17.2 230 -5 15 9.5 233 -5 45 12.4 234 -5 55 14.3 235 -5 65 19.7 236 -5 75 20.8 237 -5 85 23.9 238 -5 95 23.1 239 -5 105 23.8 240 -5 115 18.6 241 -5 125 17.4 242 -5 135 23.7 243 -5 145 24.2 244 -5 155 19.9 245 -5 165 14.9 246 -5 175 12.9 247 -5 185 17.1 248 -5 195 12.2 249 -5 205 5.0 250 -5 215 5.3 251 -5 225 7.0 252 -5 235 7.4 253 -5 245 9.3 254 -5 255 14.1 255 -5 265 20.1 256 -5 275 26.7 260 -5 315 17.0 261 -5 325 14.1 262 -5 335 10.9 263 -5 345 9.2 264 -5 355 11.3 265 -15 5 13.0 266 -15 15 19.2 268 -15 35 10.2 269 -15 45 11.6 270 -15 55 13.3 271 -15 65 17.4 272 -15 75 17.1 273 -15 85 16.9 274 -15 95 20.1 275 -15 105 16.4 276 -15 115 10.9 277 -15 125 6.6 278 -15 135 11.1 279 -15 145 14.2 280 -15 155 17.8 281 -15 165 22.6 282 -15 175 22.1 283 -15 185 17.0 284 -15 195 14.0 285 -15 205 14.3 286 -15 215 13.0 287 -15 225 13.0 288 -15 235 11.9 289 -15 245 10.9 290 -15 255 11.9 291 -15 265 17.9 292 -15 275 24.1 293 -15 285 29.9 297 -15 325 14.2 298 -15 335 11.0 299 -15 345 15.1 300 -15 355 15.9 301 -25 5 12.2 302 -25 15 7.1 304 -25 35 7.4 305 -25 45 11.1 306 -25 55 12.9 307 -25 65 18.2 308 -25 75 17.0 309 -25 85 13.8 310 -25 95 15.1 311 -25 105 15.6 312 -25 115 13.3 316 -25 155 12.6 317 -25 165 18.7 318 -25 175 21.1 319 -25 185 20.8 320 -25 195 15.9 321 -25 205 26.1 322 -25 215 17.0 323 -25 225 14.2 324 -25 235 10.8 325 -25 245 11.3 326 -25 255 15.5 327 -25 265 17.3 328 -25 275 13.3 329 -25 285 15.0 332 -25 315 18.1 333 -25 325 14.0 334 -25 335 14.6 335 -25 345 15.9 336 -25 355 17.5 337 -35 5 17.9 338 -35 15 12.3 339 -35 25 11.6 340 -35 35 9.2 341 -35 45 13.6 342 -35 55 14.7 343 -35 65 12.7 344 -35 75 13.2 345 -35 85 13.5 346 -35 95 11.3 347 -35 105 14.6 348 -35 115 13.2 349 -35 125 15.7 350 -35 135 16.4 351 -35 145 18.9 352 -35 155 13.6 353 -35 165 13.9 354 -35 175 12.7 355 -35 185 14.3 356 -35 195 15.4 357 -35 205 18.1 358 -35 215 15.8 364 -35 275 11.4 365 -35 285 16.2 367 -35 305 12.1 368 -35 315 13.3 369 -35 325 16.1 370 -35 335 13.3 371 -35 345 20.5 372 -35 355 23.5 387 -45 145 15.3 388 -45 155 19.5 389 -45 165 15.3 390 -45 175 13.6 398 -45 255 3.9 400 -45 275 11.9 401 -45 285 19.3 402 -45 295 10.4 403 -45 305 12.7 404 -45 315 12.0 423 -55 290 9.9 424 -55 310 14.9 425 -55 330 15.7