Stratus Amount-When-Present (%) June, July, August (1954 - 1997) , Ship Observations Only Global Average: 83.7 Zonal Averages 16 zones Lat.N Average 85 88.8 75 88.3 65 87.0 55 92.0 45 91.4 35 83.8 25 78.8 15 78.3 5 80.3 -5 79.2 -15 81.6 -25 81.7 -35 84.4 -45 87.3 -55 89.6 -65 90.5 Grid Box Averages 361 filled boxes Box # Lat.N Lon.E Average 1 85 60 87.3 2 85 180 91.3 3 85 300 87.7 4 75 20 90.3 5 75 60 92.0 6 75 100 94.0 7 75 140 91.3 8 75 180 88.5 9 75 220 83.2 10 75 260 77.2 11 75 300 83.7 12 75 340 90.5 13 65 10 86.4 14 65 30 89.2 15 65 50 89.1 16 65 70 90.4 20 65 150 83.6 21 65 170 95.3 22 65 190 92.6 23 65 210 90.3 24 65 230 84.6 25 65 250 79.8 26 65 270 81.2 27 65 290 82.3 28 65 310 87.9 29 65 330 84.8 30 65 350 88.0 31 55 10 82.0 32 55 30 80.9 37 55 130 90.4 38 55 150 91.7 39 55 170 94.9 40 55 190 94.6 41 55 210 93.8 42 55 230 92.6 44 55 270 86.2 45 55 290 81.7 46 55 310 90.6 47 55 330 91.9 48 55 350 88.0 49 45 5 65.0 50 45 15 59.6 51 45 25 75.6 52 45 35 74.6 53 45 45 75.8 54 45 55 65.8 62 45 135 88.9 63 45 145 90.5 64 45 155 93.2 65 45 165 94.6 66 45 175 95.1 67 45 185 94.8 68 45 195 93.6 69 45 205 93.2 70 45 215 93.1 71 45 225 92.5 72 45 235 88.3 77 45 285 78.8 78 45 295 82.6 79 45 305 85.5 80 45 315 88.6 81 45 325 89.4 82 45 335 89.1 83 45 345 88.0 84 45 355 84.0 85 35 5 66.1 86 35 15 56.6 87 35 25 51.9 88 35 35 55.4 96 35 115 80.2 97 35 125 77.3 98 35 135 79.3 99 35 145 84.8 100 35 155 88.0 101 35 165 86.7 102 35 175 86.6 103 35 185 86.8 104 35 195 86.4 105 35 205 85.7 106 35 215 86.8 107 35 225 87.9 108 35 235 89.8 109 35 245 86.5 112 35 275 66.4 113 35 285 74.5 114 35 295 77.7 115 35 305 78.0 116 35 315 77.7 117 35 325 79.7 118 35 335 82.4 119 35 345 83.6 120 35 355 72.1 124 25 35 52.0 126 25 55 71.5 127 25 65 79.9 128 25 75 79.1 129 25 85 74.7 130 25 95 77.0 131 25 105 72.8 132 25 115 78.4 133 25 125 78.5 134 25 135 76.1 135 25 145 79.9 136 25 155 77.8 137 25 165 78.6 138 25 175 76.8 139 25 185 76.9 140 25 195 73.4 141 25 205 75.2 142 25 215 82.2 143 25 225 86.9 144 25 235 89.2 145 25 245 82.0 146 25 255 70.0 147 25 265 69.8 148 25 275 70.0 149 25 285 70.0 150 25 295 70.9 151 25 305 70.5 152 25 315 72.8 153 25 325 75.6 154 25 335 77.5 155 25 345 79.0 160 15 35 63.9 161 15 45 68.7 162 15 55 69.4 163 15 65 79.6 164 15 75 78.5 165 15 85 73.0 166 15 95 78.0 167 15 105 73.3 168 15 115 79.2 169 15 125 80.5 170 15 135 84.3 171 15 145 82.6 172 15 155 81.0 173 15 165 78.7 174 15 175 76.9 175 15 185 74.8 176 15 195 73.4 177 15 205 77.4 178 15 215 79.8 179 15 225 85.6 180 15 235 84.6 181 15 245 81.9 182 15 255 77.3 183 15 265 76.9 184 15 275 73.1 185 15 285 67.3 186 15 295 68.5 187 15 305 73.1 188 15 315 77.0 189 15 325 80.5 190 15 335 78.5 191 15 345 76.0 193 5 5 81.4 197 5 45 67.7 198 5 55 62.4 199 5 65 71.3 200 5 75 74.0 201 5 85 70.0 202 5 95 75.5 203 5 105 75.6 204 5 115 78.3 205 5 125 79.2 206 5 135 81.8 207 5 145 83.3 208 5 155 82.5 209 5 165 79.9 210 5 175 79.7 211 5 185 78.7 212 5 195 81.9 213 5 205 83.1 214 5 215 83.5 215 5 225 86.3 216 5 235 80.2 217 5 245 84.8 218 5 255 85.9 219 5 265 84.1 220 5 275 82.2 221 5 285 79.3 223 5 305 77.3 224 5 315 77.8 225 5 325 79.7 226 5 335 81.3 227 5 345 82.6 228 5 355 80.7 229 -5 5 79.4 230 -5 15 76.9 233 -5 45 73.5 234 -5 55 78.5 235 -5 65 77.6 236 -5 75 78.6 237 -5 85 77.8 238 -5 95 79.7 239 -5 105 75.3 240 -5 115 72.6 241 -5 125 76.0 242 -5 135 77.9 243 -5 145 79.3 244 -5 155 82.6 245 -5 165 81.8 246 -5 175 76.4 247 -5 185 74.5 248 -5 195 77.6 249 -5 205 71.4 250 -5 215 76.1 251 -5 225 76.9 252 -5 235 69.3 253 -5 245 69.6 254 -5 255 80.5 255 -5 265 85.2 256 -5 275 89.7 257 -5 285 94.6 260 -5 315 65.0 261 -5 325 75.8 262 -5 335 76.3 263 -5 345 76.5 264 -5 355 80.4 265 -15 5 88.8 266 -15 15 85.5 268 -15 35 73.3 269 -15 45 71.8 270 -15 55 77.6 271 -15 65 80.1 272 -15 75 81.2 273 -15 85 80.9 274 -15 95 81.7 275 -15 105 80.3 276 -15 115 74.5 277 -15 125 71.5 278 -15 135 75.0 279 -15 145 76.7 280 -15 155 82.0 281 -15 165 83.5 282 -15 175 82.0 283 -15 185 82.5 284 -15 195 79.0 285 -15 205 79.7 286 -15 215 80.0 287 -15 225 79.7 288 -15 235 76.8 289 -15 245 81.7 290 -15 255 80.2 291 -15 265 79.5 292 -15 275 88.3 293 -15 285 92.6 297 -15 325 73.7 298 -15 335 74.7 299 -15 345 80.9 300 -15 355 86.4 301 -25 5 83.3 302 -25 15 81.9 304 -25 35 76.6 305 -25 45 75.6 306 -25 55 78.0 307 -25 65 78.7 308 -25 75 82.6 309 -25 85 82.7 310 -25 95 81.8 311 -25 105 78.9 312 -25 115 79.8 315 -25 145 80.7 316 -25 155 80.4 317 -25 165 80.4 318 -25 175 83.7 319 -25 185 82.0 320 -25 195 84.6 321 -25 205 84.3 322 -25 215 85.7 323 -25 225 85.0 324 -25 235 83.6 325 -25 245 80.5 326 -25 255 79.0 327 -25 265 82.3 328 -25 275 81.2 329 -25 285 87.9 332 -25 315 74.9 333 -25 325 76.5 334 -25 335 81.5 335 -25 345 79.7 336 -25 355 80.4 337 -35 5 82.9 338 -35 15 79.8 339 -35 25 80.4 340 -35 35 77.9 341 -35 45 81.2 342 -35 55 80.9 343 -35 65 83.1 344 -35 75 85.6 345 -35 85 83.9 346 -35 95 85.0 347 -35 105 84.6 348 -35 115 80.8 349 -35 125 78.9 350 -35 135 80.1 351 -35 145 81.6 352 -35 155 82.2 353 -35 165 83.2 354 -35 175 85.5 355 -35 185 85.2 356 -35 195 85.6 357 -35 205 87.2 358 -35 215 86.9 359 -35 225 86.8 360 -35 235 87.5 361 -35 245 89.9 362 -35 255 85.6 363 -35 265 85.5 364 -35 275 88.7 365 -35 285 84.1 367 -35 305 85.6 368 -35 315 83.2 369 -35 325 84.5 370 -35 335 84.1 371 -35 345 83.3 372 -35 355 82.7 376 -45 35 82.6 377 -45 45 89.3 378 -45 55 88.1 379 -45 65 86.4 380 -45 75 86.3 381 -45 85 86.3 383 -45 105 89.6 384 -45 115 87.3 385 -45 125 88.5 386 -45 135 84.9 387 -45 145 83.7 388 -45 155 83.9 389 -45 165 85.8 390 -45 175 86.7 391 -45 185 88.5 392 -45 195 88.0 393 -45 205 89.4 394 -45 215 90.5 395 -45 225 84.7 396 -45 235 92.0 397 -45 245 92.4 398 -45 255 89.0 399 -45 265 86.8 400 -45 275 88.7 401 -45 285 91.1 402 -45 295 81.4 403 -45 305 85.5 404 -45 315 84.8 405 -45 325 83.2 406 -45 335 89.2 407 -45 345 89.9 408 -45 355 85.8 411 -55 50 94.7 412 -55 70 84.2 417 -55 170 87.2 418 -55 190 88.2 419 -55 210 88.7 420 -55 230 93.1 421 -55 250 91.6 422 -55 270 92.6 423 -55 290 86.7 424 -55 310 87.3 425 -55 330 87.2 427 -65 10 90.5