Total Cloud Cover Average Cloud Amount (%) March (1954 - 1997) Day, Ship Observations Only Global Average: 66.4 Zonal Averages 17 zones Lat.N Average 85 55.8 75 64.5 65 78.1 55 80.2 45 77.1 35 70.4 25 58.0 15 48.7 5 59.0 -5 59.6 -15 58.2 -25 60.3 -35 67.9 -45 78.5 -55 84.9 -65 88.1 -75 82.3 Grid Box Averages 387 filled boxes Box # Lat.N Lon.E Average 1 85 60 60.0 2 85 180 55.5 3 85 300 50.4 4 75 20 81.7 5 75 60 77.0 6 75 100 36.6 7 75 140 55.6 8 75 180 49.1 9 75 220 65.0 12 75 340 75.9 13 65 10 78.2 14 65 30 73.7 15 65 50 67.9 21 65 170 70.2 22 65 190 71.7 23 65 210 67.8 28 65 310 77.5 29 65 330 82.9 30 65 350 82.6 31 55 10 72.2 32 55 30 65.2 38 55 150 72.4 39 55 170 80.0 40 55 190 83.2 41 55 210 82.2 42 55 230 79.5 46 55 310 85.2 47 55 330 82.9 48 55 350 78.4 49 45 5 56.6 50 45 15 56.0 51 45 25 67.8 52 45 35 67.2 53 45 45 69.9 54 45 55 66.8 62 45 135 54.1 63 45 145 65.8 64 45 155 81.2 65 45 165 81.8 66 45 175 81.3 67 45 185 81.2 68 45 195 81.7 69 45 205 82.7 70 45 215 82.5 71 45 225 80.2 72 45 235 74.1 77 45 285 62.4 78 45 295 69.2 79 45 305 78.0 80 45 315 82.1 81 45 325 80.1 82 45 335 78.3 83 45 345 75.0 84 45 355 70.4 85 35 5 54.4 86 35 15 55.0 87 35 25 54.1 88 35 35 51.4 89 35 45 63.3 90 35 55 65.2 96 35 115 51.2 97 35 125 62.1 98 35 135 68.4 99 35 145 74.0 100 35 155 77.8 101 35 165 77.4 102 35 175 75.7 103 35 185 76.1 104 35 195 76.4 105 35 205 76.1 106 35 215 76.0 107 35 225 75.7 108 35 235 66.5 109 35 245 54.5 112 35 275 53.3 113 35 285 65.0 114 35 295 74.4 115 35 305 73.2 116 35 315 70.1 117 35 325 69.5 118 35 335 70.8 119 35 345 63.9 120 35 355 49.7 124 25 35 26.1 125 25 45 50.1 126 25 55 35.5 127 25 65 23.4 128 25 75 21.7 129 25 85 31.6 130 25 95 40.9 131 25 105 86.8 132 25 115 76.4 133 25 125 72.9 134 25 135 64.0 135 25 145 57.6 136 25 155 60.3 137 25 165 60.0 138 25 175 58.1 139 25 185 58.9 140 25 195 59.5 141 25 205 62.1 142 25 215 67.9 143 25 225 71.4 144 25 235 71.7 145 25 245 50.1 146 25 255 39.6 147 25 265 59.5 148 25 275 52.4 149 25 285 53.5 150 25 295 52.7 151 25 305 53.0 152 25 315 55.3 153 25 325 57.0 154 25 335 55.2 155 25 345 39.0 160 15 35 29.3 161 15 45 31.3 162 15 55 27.8 163 15 65 23.0 164 15 75 25.3 165 15 85 30.4 166 15 95 30.1 167 15 105 61.9 168 15 115 47.8 169 15 125 50.9 170 15 135 53.3 171 15 145 52.7 172 15 155 52.6 173 15 165 52.1 174 15 175 50.6 175 15 185 52.6 176 15 195 57.0 177 15 205 57.2 178 15 215 63.7 179 15 225 69.8 180 15 235 70.8 181 15 245 59.2 182 15 255 35.5 183 15 265 27.8 184 15 275 40.3 185 15 285 47.2 186 15 295 45.4 187 15 305 48.3 188 15 315 50.9 189 15 325 56.5 190 15 335 50.4 191 15 345 30.4 193 5 5 68.1 197 5 45 38.7 198 5 55 39.5 199 5 65 38.8 200 5 75 42.3 201 5 85 55.5 202 5 95 63.6 203 5 105 58.6 204 5 115 56.5 205 5 125 60.3 206 5 135 65.3 207 5 145 66.3 208 5 155 68.7 209 5 165 67.3 210 5 175 61.7 211 5 185 63.8 212 5 195 63.4 213 5 205 66.2 214 5 215 65.7 215 5 225 65.1 216 5 235 64.8 217 5 245 56.5 218 5 255 48.5 219 5 265 48.9 220 5 275 48.5 221 5 285 58.9 223 5 305 58.7 224 5 315 68.5 225 5 325 68.8 226 5 335 62.6 227 5 345 52.7 228 5 355 64.7 229 -5 5 63.1 230 -5 15 68.9 232 -5 35 57.0 233 -5 45 47.9 234 -5 55 51.5 235 -5 65 55.9 236 -5 75 59.3 237 -5 85 63.6 238 -5 95 67.7 239 -5 105 71.0 240 -5 115 68.8 241 -5 125 64.7 242 -5 135 72.5 243 -5 145 73.9 244 -5 155 70.5 245 -5 165 71.0 246 -5 175 67.3 247 -5 185 64.2 248 -5 195 58.5 249 -5 205 55.2 250 -5 215 52.6 251 -5 225 50.5 252 -5 235 51.4 253 -5 245 56.6 254 -5 255 56.6 255 -5 265 59.5 256 -5 275 51.8 257 -5 285 56.5 260 -5 315 72.3 261 -5 325 61.5 262 -5 335 56.1 263 -5 345 50.4 264 -5 355 51.3 265 -15 5 67.9 266 -15 15 69.2 268 -15 35 53.2 269 -15 45 59.2 270 -15 55 57.9 271 -15 65 56.2 272 -15 75 58.1 273 -15 85 59.6 274 -15 95 62.9 275 -15 105 56.9 276 -15 115 47.3 277 -15 125 57.6 278 -15 135 69.6 279 -15 145 67.7 280 -15 155 65.1 281 -15 165 66.2 282 -15 175 69.7 283 -15 185 69.0 284 -15 195 64.0 285 -15 205 61.3 286 -15 215 58.1 287 -15 225 51.0 288 -15 235 48.9 289 -15 245 50.0 290 -15 255 51.7 291 -15 265 53.9 292 -15 275 62.6 293 -15 285 59.8 297 -15 325 55.1 298 -15 335 47.3 299 -15 345 45.7 300 -15 355 55.8 301 -25 5 65.0 302 -25 15 57.4 304 -25 35 52.4 305 -25 45 54.0 306 -25 55 58.9 307 -25 65 57.7 308 -25 75 59.4 309 -25 85 59.5 310 -25 95 63.6 311 -25 105 63.5 312 -25 115 41.8 315 -25 145 61.5 316 -25 155 58.9 317 -25 165 60.6 318 -25 175 64.8 319 -25 185 68.0 320 -25 195 67.3 321 -25 205 64.7 322 -25 215 66.3 323 -25 225 62.3 324 -25 235 56.9 325 -25 245 54.7 326 -25 255 50.0 327 -25 265 56.0 328 -25 275 65.2 329 -25 285 75.5 332 -25 315 59.6 333 -25 325 59.0 334 -25 335 58.6 335 -25 345 53.0 336 -25 355 58.0 337 -35 5 68.1 338 -35 15 50.4 339 -35 25 57.1 340 -35 35 59.2 341 -35 45 65.0 342 -35 55 67.6 343 -35 65 70.7 344 -35 75 70.3 345 -35 85 71.6 346 -35 95 74.4 347 -35 105 74.0 348 -35 115 59.6 349 -35 125 71.5 350 -35 135 69.1 351 -35 145 61.6 352 -35 155 60.1 353 -35 165 66.2 354 -35 175 60.7 355 -35 185 68.5 356 -35 195 72.1 357 -35 205 73.9 358 -35 215 74.3 359 -35 225 74.5 360 -35 235 69.8 361 -35 245 72.6 362 -35 255 70.4 363 -35 265 75.4 364 -35 275 74.8 365 -35 285 69.6 367 -35 305 55.0 368 -35 315 62.0 369 -35 325 66.8 370 -35 335 68.6 371 -35 345 67.6 372 -35 355 65.6 373 -45 5 81.7 374 -45 15 81.9 375 -45 25 81.0 376 -45 35 83.6 377 -45 45 80.1 378 -45 55 80.5 379 -45 65 79.3 380 -45 75 81.0 381 -45 85 82.4 382 -45 95 79.0 383 -45 105 85.8 384 -45 115 83.3 385 -45 125 81.3 386 -45 135 77.2 387 -45 145 69.9 388 -45 155 73.0 389 -45 165 78.9 390 -45 175 63.0 391 -45 185 73.8 392 -45 195 78.8 393 -45 205 81.7 394 -45 215 78.9 395 -45 225 81.6 396 -45 235 82.1 397 -45 245 84.2 398 -45 255 87.4 399 -45 265 81.6 400 -45 275 80.6 401 -45 285 81.2 402 -45 295 57.0 403 -45 305 62.4 404 -45 315 72.0 405 -45 325 74.2 406 -45 335 74.4 407 -45 345 81.9 408 -45 355 78.4 409 -55 10 86.6 410 -55 30 86.0 411 -55 50 84.9 412 -55 70 85.3 413 -55 90 84.9 414 -55 110 87.0 415 -55 130 84.6 416 -55 150 84.0 417 -55 170 82.4 418 -55 190 85.3 419 -55 210 86.3 420 -55 230 86.5 421 -55 250 88.8 422 -55 270 85.0 423 -55 290 76.9 424 -55 310 79.9 425 -55 330 83.5 426 -55 350 88.9 427 -65 10 83.9 428 -65 30 87.2 429 -65 50 83.7 430 -65 70 85.7 431 -65 90 89.7 432 -65 110 88.2 433 -65 130 83.8 434 -65 150 88.1 435 -65 170 88.7 436 -65 190 89.7 437 -65 210 92.4 438 -65 230 86.6 439 -65 250 88.1 440 -65 270 90.6 441 -65 290 84.5 442 -65 310 89.6 443 -65 330 93.2 444 -65 350 89.1 449 -75 180 86.6 450 -75 220 87.4 451 -75 260 81.3 452 -75 300 77.1 453 -75 340 74.4