Total Cloud Cover Average Cloud Amount (%) March (1954 - 1997) Night, Ship Observations Only Global Average: 67.0 Zonal Averages 17 zones Lat.N Average 85 55.4 75 63.7 65 79.5 55 80.5 45 77.0 35 70.0 25 59.0 15 49.2 5 58.2 -5 59.8 -15 59.8 -25 62.3 -35 69.3 -45 79.3 -55 85.9 -65 88.1 -75 84.1 Grid Box Averages 369 filled boxes Box # Lat.N Lon.E Average 1 85 60 58.9 2 85 180 54.1 3 85 300 52.4 4 75 20 83.1 5 75 60 74.8 7 75 140 42.4 8 75 180 44.7 9 75 220 63.9 12 75 340 78.8 13 65 10 78.6 14 65 30 77.5 15 65 50 76.4 21 65 170 74.1 22 65 190 74.3 28 65 310 78.6 29 65 330 83.3 30 65 350 82.7 31 55 10 71.9 32 55 30 63.5 38 55 150 72.4 39 55 170 82.0 40 55 190 85.1 41 55 210 81.7 42 55 230 77.9 46 55 310 85.5 47 55 330 83.4 48 55 350 76.5 49 45 5 54.5 50 45 15 50.3 51 45 25 59.0 52 45 35 63.6 53 45 45 65.0 54 45 55 55.9 62 45 135 45.5 63 45 145 63.4 64 45 155 82.2 65 45 165 82.3 66 45 175 83.0 67 45 185 82.6 68 45 195 82.0 69 45 205 83.0 70 45 215 83.7 71 45 225 80.8 72 45 235 74.1 77 45 285 61.7 78 45 295 67.8 79 45 305 78.7 80 45 315 82.0 81 45 325 80.0 82 45 335 77.9 83 45 345 75.9 84 45 355 71.4 85 35 5 54.2 86 35 15 52.1 87 35 25 50.5 88 35 35 46.1 97 35 125 59.3 98 35 135 63.9 99 35 145 73.0 100 35 155 78.5 101 35 165 77.9 102 35 175 77.8 103 35 185 78.6 104 35 195 77.4 105 35 205 76.4 106 35 215 76.9 107 35 225 76.7 108 35 235 64.6 109 35 245 51.7 112 35 275 52.8 113 35 285 61.4 114 35 295 74.3 115 35 305 71.8 116 35 315 69.3 117 35 325 69.7 118 35 335 70.3 119 35 345 65.7 120 35 355 46.5 124 25 35 22.6 125 25 45 43.4 126 25 55 32.8 127 25 65 22.1 129 25 85 30.6 130 25 95 48.2 131 25 105 84.6 132 25 115 75.2 133 25 125 72.7 134 25 135 65.0 135 25 145 59.7 136 25 155 60.7 137 25 165 61.6 138 25 175 61.1 139 25 185 63.4 140 25 195 61.6 141 25 205 63.4 142 25 215 72.2 143 25 225 76.2 144 25 235 72.7 145 25 245 49.0 146 25 255 38.7 147 25 265 58.2 148 25 275 51.8 149 25 285 52.0 150 25 295 51.3 151 25 305 52.4 152 25 315 56.5 153 25 325 58.5 154 25 335 56.5 155 25 345 40.0 160 15 35 25.1 161 15 45 28.1 162 15 55 27.4 163 15 65 22.0 164 15 75 25.6 165 15 85 31.4 166 15 95 32.1 167 15 105 56.0 168 15 115 44.1 169 15 125 48.7 170 15 135 52.1 171 15 145 52.3 172 15 155 51.5 173 15 165 52.8 174 15 175 52.0 175 15 185 53.6 176 15 195 58.2 177 15 205 59.8 178 15 215 67.0 179 15 225 76.0 180 15 235 75.6 181 15 245 62.7 182 15 255 34.2 183 15 265 29.1 184 15 275 42.0 185 15 285 45.0 186 15 295 43.8 187 15 305 48.0 188 15 315 52.7 189 15 325 57.5 190 15 335 50.9 191 15 345 28.5 193 5 5 65.3 197 5 45 36.5 198 5 55 40.1 199 5 65 37.9 200 5 75 37.7 201 5 85 53.2 202 5 95 62.5 203 5 105 54.4 204 5 115 53.0 205 5 125 57.3 206 5 135 65.4 207 5 145 66.3 208 5 155 69.5 209 5 165 62.7 210 5 175 60.6 211 5 185 62.6 212 5 195 65.3 213 5 205 67.3 214 5 215 67.4 215 5 225 69.6 216 5 235 63.4 217 5 245 56.1 218 5 255 49.4 219 5 265 48.5 220 5 275 49.6 221 5 285 50.0 223 5 305 55.5 224 5 315 69.0 225 5 325 69.2 226 5 335 62.4 227 5 345 48.1 228 5 355 60.2 229 -5 5 66.3 230 -5 15 62.0 233 -5 45 45.9 234 -5 55 47.6 235 -5 65 51.4 236 -5 75 58.3 237 -5 85 61.4 238 -5 95 67.3 239 -5 105 69.0 240 -5 115 68.7 241 -5 125 65.7 242 -5 135 72.3 243 -5 145 73.6 244 -5 155 71.7 245 -5 165 72.1 246 -5 175 68.1 247 -5 185 63.6 248 -5 195 60.7 249 -5 205 53.5 250 -5 215 47.6 251 -5 225 48.0 252 -5 235 51.4 253 -5 245 59.9 254 -5 255 62.3 255 -5 265 62.0 256 -5 275 64.6 257 -5 285 52.6 260 -5 315 75.4 261 -5 325 61.6 262 -5 335 56.3 263 -5 345 50.7 264 -5 355 52.0 265 -15 5 80.0 266 -15 15 68.6 268 -15 35 51.4 269 -15 45 54.1 270 -15 55 55.6 271 -15 65 56.0 272 -15 75 59.1 273 -15 85 60.0 274 -15 95 62.4 275 -15 105 56.4 276 -15 115 49.0 277 -15 125 54.8 278 -15 135 64.6 279 -15 145 67.2 280 -15 155 64.7 281 -15 165 67.0 282 -15 175 67.4 283 -15 185 66.7 284 -15 195 66.0 285 -15 205 56.1 286 -15 215 54.5 287 -15 225 50.6 288 -15 235 49.6 289 -15 245 52.9 290 -15 255 58.2 291 -15 265 67.4 292 -15 275 70.8 293 -15 285 62.5 297 -15 325 53.6 298 -15 335 51.3 299 -15 345 52.2 300 -15 355 65.9 301 -25 5 77.4 302 -25 15 56.5 304 -25 35 50.5 305 -25 45 55.3 306 -25 55 59.4 307 -25 65 61.0 308 -25 75 62.5 309 -25 85 67.3 310 -25 95 67.7 311 -25 105 65.3 312 -25 115 42.5 315 -25 145 71.7 316 -25 155 57.2 317 -25 165 62.5 318 -25 175 66.0 319 -25 185 68.9 320 -25 195 69.0 321 -25 205 66.6 322 -25 215 63.5 323 -25 225 61.5 324 -25 235 55.1 325 -25 245 55.8 326 -25 255 45.8 327 -25 265 61.6 328 -25 275 75.2 329 -25 285 78.4 332 -25 315 61.5 333 -25 325 59.8 334 -25 335 56.7 335 -25 345 50.1 336 -25 355 67.0 337 -35 5 74.0 338 -35 15 51.1 339 -35 25 54.0 340 -35 35 58.8 341 -35 45 60.3 342 -35 55 69.3 343 -35 65 74.4 344 -35 75 74.2 345 -35 85 77.7 346 -35 95 78.8 347 -35 105 73.7 348 -35 115 57.3 349 -35 125 72.3 350 -35 135 68.9 351 -35 145 59.4 352 -35 155 58.7 353 -35 165 68.5 354 -35 175 62.9 355 -35 185 70.7 356 -35 195 74.8 357 -35 205 77.6 358 -35 215 77.8 359 -35 225 76.1 360 -35 235 67.6 363 -35 265 72.1 364 -35 275 77.5 365 -35 285 68.8 367 -35 305 49.6 368 -35 315 61.9 369 -35 325 68.4 370 -35 335 76.9 371 -35 345 71.1 372 -35 355 72.0 373 -45 5 85.8 374 -45 15 82.1 375 -45 25 87.7 376 -45 35 87.3 377 -45 45 82.3 378 -45 55 81.5 379 -45 65 85.2 380 -45 75 84.4 381 -45 85 87.2 382 -45 95 83.2 383 -45 105 78.7 384 -45 115 81.2 385 -45 125 84.3 386 -45 135 77.5 387 -45 145 65.0 388 -45 155 75.4 389 -45 165 78.4 390 -45 175 61.1 391 -45 185 79.7 392 -45 195 79.8 393 -45 205 81.5 394 -45 215 86.5 399 -45 265 85.1 400 -45 275 81.6 401 -45 285 77.9 402 -45 295 53.1 403 -45 305 59.6 404 -45 315 72.5 405 -45 325 74.7 408 -45 355 81.3 409 -55 10 88.8 410 -55 30 88.6 411 -55 50 85.1 412 -55 70 84.7 413 -55 90 86.2 414 -55 110 87.6 415 -55 130 84.7 416 -55 150 86.7 417 -55 170 82.3 418 -55 190 87.5 419 -55 210 86.2 421 -55 250 93.2 422 -55 270 86.8 423 -55 290 78.7 424 -55 310 76.1 425 -55 330 86.3 426 -55 350 89.8 427 -65 10 85.4 428 -65 30 84.8 429 -65 50 83.5 430 -65 70 86.8 431 -65 90 89.6 432 -65 110 87.9 433 -65 130 91.1 434 -65 150 86.7 435 -65 170 87.4 436 -65 190 90.5 437 -65 210 92.9 438 -65 230 86.3 440 -65 270 89.4 441 -65 290 85.2 442 -65 310 89.0 443 -65 330 91.5 444 -65 350 88.7 449 -75 180 89.5 450 -75 220 88.9 452 -75 300 80.2 453 -75 340 72.7