Stratus Frequency of Occurrence (%) June (1954 - 1997) Night, Ship Observations Only Global Average: 13.5 Zonal Averages 15 zones Lat.N Average 85 37.3 75 26.7 65 23.4 55 27.2 45 24.9 35 17.5 25 7.9 15 8.8 5 10.5 -5 6.6 -15 8.4 -25 9.4 -35 15.7 -45 20.2 -55 14.2 Grid Box Averages 326 filled boxes Box # Lat.N Lon.E Average 1 85 60 37.1 2 85 180 34.0 3 85 300 42.3 4 75 20 19.7 5 75 60 16.9 6 75 100 23.6 7 75 140 40.9 8 75 180 29.5 9 75 220 29.7 10 75 260 18.8 11 75 300 27.1 12 75 340 30.9 13 65 10 21.8 14 65 30 15.7 15 65 50 16.1 20 65 150 15.1 21 65 170 16.1 22 65 190 19.9 23 65 210 32.6 27 65 290 18.2 28 65 310 32.9 29 65 330 30.1 30 65 350 23.1 31 55 10 16.7 32 55 30 8.7 37 55 130 6.9 38 55 150 18.8 39 55 170 30.8 40 55 190 34.2 41 55 210 32.3 42 55 230 30.4 45 55 290 21.3 46 55 310 28.6 47 55 330 27.9 48 55 350 21.6 49 45 5 7.4 50 45 15 4.5 51 45 25 6.2 52 45 35 6.8 53 45 45 13.2 54 45 55 9.1 62 45 135 12.4 63 45 145 15.6 64 45 155 27.9 65 45 165 36.1 66 45 175 36.8 67 45 185 35.7 68 45 195 31.3 69 45 205 29.7 70 45 215 29.6 71 45 225 26.0 72 45 235 18.6 77 45 285 12.3 78 45 295 12.8 79 45 305 18.0 80 45 315 21.0 81 45 325 25.6 82 45 335 27.1 83 45 345 22.2 84 45 355 17.5 85 35 5 7.8 86 35 15 4.0 87 35 25 3.0 88 35 35 2.5 96 35 115 14.0 97 35 125 19.6 98 35 135 23.2 99 35 145 26.8 100 35 155 30.7 101 35 165 28.1 102 35 175 25.3 103 35 185 25.8 104 35 195 22.1 105 35 205 19.4 106 35 215 17.7 107 35 225 13.6 108 35 235 17.1 109 35 245 23.4 112 35 275 8.1 113 35 285 11.7 114 35 295 13.6 115 35 305 14.6 116 35 315 9.3 117 35 325 12.7 118 35 335 14.1 119 35 345 14.0 120 35 355 9.5 124 25 35 0.6 125 25 45 0.7 126 25 55 2.1 127 25 65 7.8 128 25 75 9.7 129 25 85 14.6 131 25 105 10.0 132 25 115 15.5 133 25 125 16.4 134 25 135 15.7 135 25 145 7.4 136 25 155 7.8 137 25 165 8.9 138 25 175 7.3 139 25 185 5.3 140 25 195 3.4 141 25 205 5.0 142 25 215 9.5 143 25 225 11.9 144 25 235 13.0 145 25 245 12.9 146 25 255 6.7 147 25 265 4.4 148 25 275 5.3 149 25 285 7.9 150 25 295 6.5 151 25 305 3.5 152 25 315 3.8 153 25 325 4.5 154 25 335 6.4 155 25 345 8.2 160 15 35 1.2 161 15 45 2.7 162 15 55 7.7 163 15 65 15.6 164 15 75 23.0 165 15 85 16.9 166 15 95 14.7 167 15 105 5.8 168 15 115 12.1 169 15 125 9.4 170 15 135 8.1 171 15 145 4.3 172 15 155 4.6 173 15 165 4.5 174 15 175 6.0 175 15 185 5.2 176 15 195 5.1 177 15 205 4.2 178 15 215 9.6 179 15 225 12.0 180 15 235 10.2 181 15 245 8.1 182 15 255 10.8 183 15 265 13.1 184 15 275 10.0 185 15 285 8.0 186 15 295 5.3 187 15 305 7.3 188 15 315 10.1 189 15 325 10.8 190 15 335 7.8 191 15 345 6.3 193 5 5 14.6 197 5 45 4.3 198 5 55 4.6 199 5 65 7.2 200 5 75 13.4 201 5 85 11.5 202 5 95 10.8 203 5 105 9.0 204 5 115 12.4 205 5 125 8.8 206 5 135 7.4 207 5 145 8.0 208 5 155 8.9 209 5 165 8.5 210 5 175 10.1 211 5 185 8.8 212 5 195 10.4 213 5 205 11.2 214 5 215 6.3 215 5 225 8.7 216 5 235 15.1 217 5 245 11.5 218 5 255 8.8 219 5 265 14.8 220 5 275 17.4 221 5 285 15.3 223 5 305 14.3 224 5 315 13.6 225 5 325 9.7 226 5 335 11.7 227 5 345 11.9 228 5 355 12.3 229 -5 5 6.5 230 -5 15 2.1 233 -5 45 5.0 234 -5 55 6.6 235 -5 65 9.5 236 -5 75 9.1 237 -5 85 10.1 238 -5 95 11.4 239 -5 105 6.6 240 -5 115 3.1 241 -5 125 6.0 242 -5 135 9.1 243 -5 145 10.3 244 -5 155 11.6 245 -5 165 7.3 246 -5 175 8.2 247 -5 185 4.8 248 -5 195 5.9 249 -5 205 0.9 250 -5 215 2.0 251 -5 225 2.6 252 -5 235 2.5 253 -5 245 2.8 254 -5 255 3.4 255 -5 265 8.7 256 -5 275 18.1 257 -5 285 18.7 260 -5 315 7.7 261 -5 325 9.1 262 -5 335 4.8 263 -5 345 4.0 264 -5 355 3.9 265 -15 5 7.3 266 -15 15 11.1 268 -15 35 1.1 269 -15 45 2.5 270 -15 55 7.5 271 -15 65 7.9 272 -15 75 10.9 273 -15 85 14.4 274 -15 95 15.8 275 -15 105 9.2 276 -15 115 3.9 277 -15 125 1.9 278 -15 135 4.8 279 -15 145 9.1 280 -15 155 12.2 281 -15 165 14.6 282 -15 175 12.1 283 -15 185 9.9 284 -15 195 9.8 285 -15 205 6.4 286 -15 215 4.6 287 -15 225 4.0 288 -15 235 6.4 289 -15 245 6.5 290 -15 255 5.1 291 -15 265 6.5 292 -15 275 12.8 293 -15 285 16.6 297 -15 325 8.4 298 -15 335 3.8 299 -15 345 8.2 300 -15 355 7.3 301 -25 5 9.7 302 -25 15 6.3 304 -25 35 4.8 305 -25 45 5.4 306 -25 55 7.2 307 -25 65 8.2 308 -25 75 9.3 309 -25 85 8.7 310 -25 95 12.1 311 -25 105 8.6 312 -25 115 8.5 316 -25 155 9.1 317 -25 165 10.0 318 -25 175 16.9 319 -25 185 15.5 320 -25 195 9.4 321 -25 205 13.6 322 -25 215 12.2 323 -25 225 10.3 324 -25 235 8.9 325 -25 245 8.5 326 -25 255 6.1 327 -25 265 12.2 328 -25 275 7.0 329 -25 285 13.8 332 -25 315 12.7 333 -25 325 6.8 334 -25 335 3.5 335 -25 345 6.7 336 -25 355 8.0 337 -35 5 19.1 338 -35 15 11.8 339 -35 25 8.6 340 -35 35 8.2 341 -35 45 11.1 342 -35 55 9.2 343 -35 65 16.1 344 -35 75 14.5 345 -35 85 16.6 346 -35 95 16.8 347 -35 105 11.3 348 -35 115 14.6 349 -35 125 15.2 350 -35 135 15.1 351 -35 145 15.6 352 -35 155 13.7 353 -35 165 13.0 354 -35 175 15.5 355 -35 185 18.1 356 -35 195 21.9 357 -35 205 19.9 358 -35 215 18.7 359 -35 225 20.2 360 -35 235 25.3 364 -35 275 13.0 365 -35 285 17.4 367 -35 305 14.3 368 -35 315 14.2 369 -35 325 16.4 370 -35 335 11.1 371 -35 345 22.3 372 -35 355 19.9 387 -45 145 8.7 388 -45 155 19.8 389 -45 165 24.9 390 -45 175 16.1 391 -45 185 31.2 392 -45 195 34.3 394 -45 215 24.6 397 -45 245 22.9 398 -45 255 18.6 400 -45 275 13.5 401 -45 285 16.3 402 -45 295 15.7 403 -45 305 11.1 404 -45 315 20.4 417 -55 170 5.2 423 -55 290 15.6 424 -55 310 20.9 425 -55 330 15.5