Total Cloud Cover Average Cloud Amount (%) February (1954 - 1997) Night, Ship Observations Only Global Average: 67.5 Zonal Averages 17 zones Lat.N Average 85 50.6 75 68.7 65 79.5 55 81.1 45 78.4 35 70.8 25 58.2 15 49.5 5 60.4 -5 60.4 -15 61.6 -25 62.4 -35 68.6 -45 78.5 -55 86.3 -65 87.7 -75 83.8 Grid Box Averages 366 filled boxes Box # Lat.N Lon.E Average 2 85 180 50.6 4 75 20 82.7 5 75 60 76.0 8 75 180 51.4 12 75 340 65.9 13 65 10 78.5 14 65 30 79.0 21 65 170 82.3 22 65 190 78.9 28 65 310 74.3 29 65 330 81.3 30 65 350 81.3 31 55 10 72.2 32 55 30 71.7 38 55 150 75.9 39 55 170 83.3 40 55 190 83.0 41 55 210 81.8 42 55 230 81.0 46 55 310 86.7 47 55 330 82.7 48 55 350 77.5 49 45 5 56.2 50 45 15 52.4 51 45 25 69.0 52 45 35 70.7 53 45 45 70.1 54 45 55 62.0 62 45 135 56.6 63 45 145 68.2 64 45 155 82.6 65 45 165 81.6 66 45 175 81.5 67 45 185 81.0 68 45 195 80.5 69 45 205 82.4 70 45 215 81.7 71 45 225 82.6 72 45 235 75.4 77 45 285 63.7 78 45 295 74.8 79 45 305 82.5 80 45 315 85.2 81 45 325 82.0 82 45 335 79.1 83 45 345 76.2 84 45 355 73.3 85 35 5 55.4 86 35 15 53.9 87 35 25 54.6 88 35 35 48.0 97 35 125 62.9 98 35 135 67.3 99 35 145 71.4 100 35 155 78.5 101 35 165 76.2 102 35 175 74.5 103 35 185 76.9 104 35 195 75.0 105 35 205 75.7 106 35 215 76.5 107 35 225 77.0 108 35 235 67.7 109 35 245 48.2 112 35 275 57.8 113 35 285 67.0 114 35 295 78.3 115 35 305 74.6 116 35 315 71.5 117 35 325 70.8 118 35 335 71.0 119 35 345 66.9 120 35 355 50.9 124 25 35 22.0 125 25 45 42.2 126 25 55 24.8 127 25 65 17.5 129 25 85 21.8 132 25 115 75.3 133 25 125 75.1 134 25 135 66.6 135 25 145 63.0 136 25 155 63.2 137 25 165 62.0 138 25 175 60.3 139 25 185 59.5 140 25 195 54.9 141 25 205 58.1 142 25 215 67.2 143 25 225 73.9 144 25 235 74.4 145 25 245 44.2 146 25 255 37.9 147 25 265 59.4 148 25 275 54.7 149 25 285 53.0 150 25 295 52.0 151 25 305 53.0 152 25 315 56.7 153 25 325 59.3 154 25 335 54.2 155 25 345 40.1 160 15 35 31.1 161 15 45 31.0 162 15 55 30.3 163 15 65 28.6 164 15 75 24.1 165 15 85 29.1 166 15 95 25.5 167 15 105 65.5 168 15 115 49.5 169 15 125 56.9 170 15 135 58.3 171 15 145 57.7 172 15 155 53.2 173 15 165 54.0 174 15 175 53.8 175 15 185 52.8 176 15 195 50.5 177 15 205 51.3 178 15 215 61.3 179 15 225 70.6 180 15 235 74.9 181 15 245 63.2 182 15 255 37.2 183 15 265 25.7 184 15 275 42.0 185 15 285 43.5 186 15 295 44.5 187 15 305 49.6 188 15 315 54.0 189 15 325 60.3 190 15 335 46.1 191 15 345 31.7 193 5 5 62.3 197 5 45 42.2 198 5 55 47.6 199 5 65 42.0 200 5 75 41.9 201 5 85 56.5 202 5 95 61.4 203 5 105 59.9 204 5 115 62.6 205 5 125 65.9 206 5 135 66.5 207 5 145 69.2 208 5 155 71.8 209 5 165 68.4 210 5 175 69.2 211 5 185 65.8 212 5 195 60.0 213 5 205 62.3 214 5 215 65.3 215 5 225 64.3 216 5 235 73.1 217 5 245 64.3 218 5 255 55.2 219 5 265 49.2 220 5 275 47.8 221 5 285 48.1 223 5 305 57.3 224 5 315 71.7 225 5 325 68.7 226 5 335 62.4 227 5 345 45.5 228 5 355 55.2 229 -5 5 64.9 230 -5 15 62.8 233 -5 45 48.3 234 -5 55 56.7 235 -5 65 64.6 236 -5 75 65.0 237 -5 85 64.2 238 -5 95 70.7 239 -5 105 74.4 240 -5 115 73.8 241 -5 125 72.7 242 -5 135 73.9 243 -5 145 76.7 244 -5 155 71.4 245 -5 165 75.0 246 -5 175 67.4 247 -5 185 62.3 248 -5 195 61.8 249 -5 205 51.5 250 -5 215 47.5 251 -5 225 43.7 252 -5 235 44.5 253 -5 245 53.8 254 -5 255 53.9 255 -5 265 62.9 256 -5 275 67.5 257 -5 285 53.3 260 -5 315 71.1 261 -5 325 55.7 262 -5 335 52.4 263 -5 345 46.7 264 -5 355 51.3 265 -15 5 76.5 266 -15 15 66.3 268 -15 35 56.0 269 -15 45 60.7 270 -15 55 63.8 271 -15 65 61.6 272 -15 75 64.1 273 -15 85 61.5 274 -15 95 64.2 275 -15 105 60.7 276 -15 115 52.8 277 -15 125 67.3 278 -15 135 72.9 279 -15 145 72.2 280 -15 155 65.3 281 -15 165 62.7 282 -15 175 67.8 283 -15 185 68.7 284 -15 195 71.2 285 -15 205 65.2 286 -15 215 59.4 287 -15 225 53.6 288 -15 235 50.7 289 -15 245 48.9 290 -15 255 57.3 291 -15 265 65.8 292 -15 275 71.5 293 -15 285 60.0 297 -15 325 51.1 298 -15 335 47.2 299 -15 345 51.1 300 -15 355 64.2 301 -25 5 78.4 302 -25 15 57.2 304 -25 35 54.3 305 -25 45 59.2 306 -25 55 61.7 307 -25 65 62.4 308 -25 75 61.1 309 -25 85 64.7 310 -25 95 72.8 311 -25 105 68.8 312 -25 115 45.4 315 -25 145 66.1 316 -25 155 62.4 317 -25 165 62.6 318 -25 175 67.8 319 -25 185 67.1 320 -25 195 69.4 321 -25 205 71.1 322 -25 215 62.4 323 -25 225 59.0 324 -25 235 54.1 325 -25 245 49.0 326 -25 255 50.4 327 -25 265 67.4 328 -25 275 75.9 329 -25 285 68.6 332 -25 315 56.5 333 -25 325 53.3 334 -25 335 51.2 335 -25 345 53.8 336 -25 355 64.8 337 -35 5 73.4 338 -35 15 50.5 339 -35 25 56.8 340 -35 35 66.9 341 -35 45 61.8 342 -35 55 67.4 343 -35 65 71.7 344 -35 75 74.4 345 -35 85 77.0 346 -35 95 78.0 347 -35 105 72.6 348 -35 115 55.3 349 -35 125 72.9 350 -35 135 65.3 351 -35 145 54.1 352 -35 155 61.6 353 -35 165 69.0 354 -35 175 61.6 355 -35 185 70.2 356 -35 195 72.8 357 -35 205 74.3 358 -35 215 76.9 359 -35 225 76.0 360 -35 235 69.9 363 -35 265 76.2 364 -35 275 74.7 365 -35 285 64.6 367 -35 305 51.0 368 -35 315 62.4 369 -35 325 70.1 370 -35 335 65.8 371 -35 345 67.7 372 -35 355 67.5 373 -45 5 85.2 374 -45 15 81.9 375 -45 25 80.3 376 -45 35 86.4 377 -45 45 85.3 378 -45 55 82.0 379 -45 65 81.6 380 -45 75 81.8 381 -45 85 85.4 382 -45 95 84.4 383 -45 105 78.6 384 -45 115 76.0 385 -45 125 82.7 386 -45 135 80.1 387 -45 145 66.8 388 -45 155 72.4 389 -45 165 77.5 390 -45 175 64.0 391 -45 185 77.6 392 -45 195 76.6 393 -45 205 80.9 394 -45 215 84.8 399 -45 265 85.0 400 -45 275 79.5 401 -45 285 76.0 402 -45 295 55.2 403 -45 305 57.6 404 -45 315 74.2 405 -45 325 74.3 406 -45 335 84.3 407 -45 345 78.0 408 -45 355 81.0 409 -55 10 91.2 410 -55 30 90.3 411 -55 50 87.9 412 -55 70 87.2 413 -55 90 88.3 414 -55 110 87.4 415 -55 130 86.3 416 -55 150 87.3 417 -55 170 85.1 418 -55 190 82.9 419 -55 210 87.3 421 -55 250 88.8 422 -55 270 82.4 423 -55 290 74.9 424 -55 310 78.5 425 -55 330 89.3 426 -55 350 90.6 427 -65 10 84.2 428 -65 30 79.4 429 -65 50 78.6 430 -65 70 80.4 431 -65 90 85.0 432 -65 110 80.5 433 -65 130 87.3 434 -65 150 90.0 435 -65 170 91.5 436 -65 190 91.2 437 -65 210 93.2 438 -65 230 93.6 439 -65 250 92.2 440 -65 270 88.3 441 -65 290 83.6 442 -65 310 90.5 443 -65 330 94.0 444 -65 350 87.5 449 -75 180 82.0 450 -75 220 86.6 451 -75 260 91.2 452 -75 300 83.6 453 -75 340 77.2