Total Cloud Cover Average Cloud Amount (%) March (1954 - 1997) , Ship Observations Only Global Average: 66.7 Zonal Averages 17 zones Lat.N Average 85 55.6 75 63.3 65 78.7 55 80.3 45 77.0 35 70.2 25 58.5 15 48.9 5 58.6 -5 59.7 -15 59.0 -25 61.3 -35 68.7 -45 79.1 -55 85.4 -65 88.2 -75 83.0 Grid Box Averages 389 filled boxes Box # Lat.N Lon.E Average 1 85 60 59.4 2 85 180 54.8 3 85 300 51.4 4 75 20 82.4 5 75 60 75.9 6 75 100 33.5 7 75 140 51.4 8 75 180 46.9 9 75 220 64.5 12 75 340 77.3 13 65 10 78.4 14 65 30 75.6 15 65 50 72.1 21 65 170 72.2 22 65 190 73.0 23 65 210 66.3 27 65 290 78.0 28 65 310 78.1 29 65 330 83.1 30 65 350 82.6 31 55 10 72.1 32 55 30 64.3 38 55 150 72.4 39 55 170 81.0 40 55 190 84.2 41 55 210 82.0 42 55 230 78.7 46 55 310 85.3 47 55 330 83.2 48 55 350 77.5 49 45 5 55.5 50 45 15 53.1 51 45 25 63.4 52 45 35 65.4 53 45 45 67.4 54 45 55 61.4 61 45 125 50.1 62 45 135 49.8 63 45 145 64.6 64 45 155 81.7 65 45 165 82.0 66 45 175 82.2 67 45 185 81.9 68 45 195 81.8 69 45 205 82.9 70 45 215 83.1 71 45 225 80.5 72 45 235 74.1 77 45 285 62.0 78 45 295 68.5 79 45 305 78.4 80 45 315 82.1 81 45 325 80.1 82 45 335 78.1 83 45 345 75.5 84 45 355 70.9 85 35 5 54.3 86 35 15 53.5 87 35 25 52.3 88 35 35 48.7 89 35 45 64.1 90 35 55 61.7 96 35 115 48.2 97 35 125 60.7 98 35 135 66.2 99 35 145 73.5 100 35 155 78.1 101 35 165 77.7 102 35 175 76.7 103 35 185 77.3 104 35 195 76.9 105 35 205 76.2 106 35 215 76.5 107 35 225 76.2 108 35 235 65.5 109 35 245 53.1 112 35 275 53.0 113 35 285 63.2 114 35 295 74.4 115 35 305 72.5 116 35 315 69.7 117 35 325 69.6 118 35 335 70.6 119 35 345 64.8 120 35 355 48.1 124 25 35 24.4 125 25 45 46.8 126 25 55 34.2 127 25 65 22.8 128 25 75 21.7 129 25 85 31.1 130 25 95 43.1 131 25 105 86.4 132 25 115 75.8 133 25 125 72.8 134 25 135 64.5 135 25 145 58.6 136 25 155 60.5 137 25 165 60.8 138 25 175 59.6 139 25 185 61.2 140 25 195 60.6 141 25 205 62.7 142 25 215 70.0 143 25 225 73.8 144 25 235 72.2 145 25 245 49.5 146 25 255 39.2 147 25 265 58.8 148 25 275 52.1 149 25 285 52.8 150 25 295 52.0 151 25 305 52.7 152 25 315 55.9 153 25 325 57.7 154 25 335 55.8 155 25 345 39.5 160 15 35 27.2 161 15 45 29.7 162 15 55 27.6 163 15 65 22.5 164 15 75 25.4 165 15 85 30.9 166 15 95 31.1 167 15 105 59.0 168 15 115 45.9 169 15 125 49.8 170 15 135 52.7 171 15 145 52.5 172 15 155 52.1 173 15 165 52.5 174 15 175 51.3 175 15 185 53.1 176 15 195 57.6 177 15 205 58.5 178 15 215 65.4 179 15 225 72.9 180 15 235 73.2 181 15 245 61.0 182 15 255 34.9 183 15 265 28.5 184 15 275 41.1 185 15 285 46.1 186 15 295 44.6 187 15 305 48.1 188 15 315 51.8 189 15 325 57.0 190 15 335 50.6 191 15 345 29.4 193 5 5 66.8 197 5 45 37.6 198 5 55 39.8 199 5 65 38.3 200 5 75 40.0 201 5 85 54.3 202 5 95 63.0 203 5 105 56.5 204 5 115 54.8 205 5 125 58.8 206 5 135 65.3 207 5 145 66.3 208 5 155 69.1 209 5 165 65.0 210 5 175 61.1 211 5 185 63.2 212 5 195 64.3 213 5 205 66.8 214 5 215 66.5 215 5 225 67.4 216 5 235 64.1 217 5 245 56.3 218 5 255 49.0 219 5 265 48.7 220 5 275 49.0 221 5 285 54.4 223 5 305 57.1 224 5 315 68.7 225 5 325 69.0 226 5 335 62.5 227 5 345 50.4 228 5 355 62.4 229 -5 5 64.7 230 -5 15 65.4 232 -5 35 56.6 233 -5 45 46.9 234 -5 55 49.6 235 -5 65 53.6 236 -5 75 58.8 237 -5 85 62.5 238 -5 95 67.5 239 -5 105 70.0 240 -5 115 68.7 241 -5 125 65.2 242 -5 135 72.4 243 -5 145 73.7 244 -5 155 71.1 245 -5 165 71.5 246 -5 175 67.7 247 -5 185 63.9 248 -5 195 59.6 249 -5 205 54.4 250 -5 215 50.1 251 -5 225 49.2 252 -5 235 51.4 253 -5 245 58.3 254 -5 255 59.5 255 -5 265 60.7 256 -5 275 58.2 257 -5 285 54.5 260 -5 315 73.9 261 -5 325 61.5 262 -5 335 56.2 263 -5 345 50.6 264 -5 355 51.6 265 -15 5 73.9 266 -15 15 68.9 268 -15 35 52.3 269 -15 45 56.6 270 -15 55 56.7 271 -15 65 56.1 272 -15 75 58.6 273 -15 85 59.8 274 -15 95 62.7 275 -15 105 56.6 276 -15 115 48.1 277 -15 125 56.2 278 -15 135 67.1 279 -15 145 67.4 280 -15 155 64.9 281 -15 165 66.6 282 -15 175 68.5 283 -15 185 67.9 284 -15 195 65.0 285 -15 205 58.7 286 -15 215 56.3 287 -15 225 50.8 288 -15 235 49.2 289 -15 245 51.5 290 -15 255 55.0 291 -15 265 60.6 292 -15 275 66.7 293 -15 285 61.2 297 -15 325 54.4 298 -15 335 49.3 299 -15 345 49.0 300 -15 355 60.9 301 -25 5 71.2 302 -25 15 57.0 304 -25 35 51.5 305 -25 45 54.6 306 -25 55 59.2 307 -25 65 59.4 308 -25 75 60.9 309 -25 85 63.4 310 -25 95 65.7 311 -25 105 64.4 312 -25 115 42.1 315 -25 145 63.4 316 -25 155 58.1 317 -25 165 61.6 318 -25 175 65.4 319 -25 185 68.5 320 -25 195 68.2 321 -25 205 65.7 322 -25 215 64.9 323 -25 225 61.9 324 -25 235 56.0 325 -25 245 55.2 326 -25 255 49.1 327 -25 265 58.8 328 -25 275 70.2 329 -25 285 77.0 332 -25 315 60.6 333 -25 325 59.4 334 -25 335 57.6 335 -25 345 51.6 336 -25 355 62.5 337 -35 5 71.0 338 -35 15 50.7 339 -35 25 55.6 340 -35 35 59.0 341 -35 45 62.7 342 -35 55 68.5 343 -35 65 72.5 344 -35 75 72.2 345 -35 85 74.7 346 -35 95 76.6 347 -35 105 73.9 348 -35 115 58.4 349 -35 125 71.9 350 -35 135 69.0 351 -35 145 60.5 352 -35 155 59.4 353 -35 165 67.4 354 -35 175 61.8 355 -35 185 69.6 356 -35 195 73.4 357 -35 205 75.7 358 -35 215 76.0 359 -35 225 75.3 360 -35 235 68.7 361 -35 245 71.7 362 -35 255 71.9 363 -35 265 73.8 364 -35 275 76.2 365 -35 285 69.2 367 -35 305 52.3 368 -35 315 61.9 369 -35 325 67.6 370 -35 335 72.8 371 -35 345 69.4 372 -35 355 68.8 373 -45 5 83.8 374 -45 15 82.0 375 -45 25 84.3 376 -45 35 85.4 377 -45 45 81.2 378 -45 55 81.0 379 -45 65 82.3 380 -45 75 82.7 381 -45 85 84.8 382 -45 95 81.1 383 -45 105 82.3 384 -45 115 82.9 385 -45 125 81.9 386 -45 135 77.4 387 -45 145 67.5 388 -45 155 74.2 389 -45 165 78.7 390 -45 175 62.1 391 -45 185 76.7 392 -45 195 79.3 393 -45 205 81.6 394 -45 215 80.4 395 -45 225 82.1 396 -45 235 82.0 397 -45 245 84.6 398 -45 255 87.3 399 -45 265 83.3 400 -45 275 81.1 401 -45 285 79.5 402 -45 295 55.0 403 -45 305 61.0 404 -45 315 72.2 405 -45 325 74.5 406 -45 335 74.9 407 -45 345 81.6 408 -45 355 79.3 409 -55 10 87.7 410 -55 30 87.3 411 -55 50 85.0 412 -55 70 85.0 413 -55 90 85.5 414 -55 110 87.3 415 -55 130 84.7 416 -55 150 85.3 417 -55 170 82.3 418 -55 190 86.4 419 -55 210 86.3 420 -55 230 86.3 421 -55 250 89.9 422 -55 270 85.9 423 -55 290 77.8 424 -55 310 78.0 425 -55 330 84.9 426 -55 350 89.4 427 -65 10 84.6 428 -65 30 86.0 429 -65 50 83.6 430 -65 70 86.3 431 -65 90 89.7 432 -65 110 88.0 433 -65 130 87.4 434 -65 150 87.4 435 -65 170 88.0 436 -65 190 90.1 437 -65 210 92.6 438 -65 230 86.5 439 -65 250 90.1 440 -65 270 90.0 441 -65 290 84.8 442 -65 310 89.3 443 -65 330 92.3 444 -65 350 88.9 449 -75 180 88.1 450 -75 220 88.2 451 -75 260 81.9 452 -75 300 78.3 453 -75 340 73.5