Cumulus Amount-When-Present (%) June, July, August (1954 - 1997) Night, Ship Observations Only Global Average: 39.7 Zonal Averages 15 zones Lat.N Average 85 40.9 75 46.0 65 45.6 55 45.4 45 42.3 35 36.2 25 35.1 15 37.5 5 36.9 -5 34.8 -15 36.7 -25 36.6 -35 40.6 -45 47.1 -55 51.0 Grid Box Averages 316 filled boxes Box # Lat.N Lon.E Average 1 85 60 40.9 4 75 20 49.3 5 75 60 51.8 8 75 180 46.7 9 75 220 36.3 10 75 260 36.7 11 75 300 31.8 12 75 340 46.9 13 65 10 46.6 14 65 30 48.9 15 65 50 50.1 21 65 170 46.0 22 65 190 45.3 23 65 210 38.2 25 65 250 37.8 26 65 270 37.1 27 65 290 35.1 28 65 310 42.5 29 65 330 44.6 30 65 350 51.3 31 55 10 39.1 32 55 30 34.4 37 55 130 41.3 38 55 150 43.3 39 55 170 47.7 40 55 190 50.0 41 55 210 50.1 42 55 230 50.3 45 55 290 34.1 46 55 310 44.6 47 55 330 49.3 48 55 350 41.8 49 45 5 35.0 50 45 15 30.5 51 45 25 33.3 52 45 35 38.6 62 45 135 45.9 63 45 145 48.2 64 45 155 44.1 65 45 165 49.0 66 45 175 51.4 67 45 185 50.3 68 45 195 46.1 69 45 205 48.6 70 45 215 51.9 71 45 225 49.8 72 45 235 44.7 77 45 285 40.7 78 45 295 35.7 79 45 305 37.3 80 45 315 41.0 81 45 325 40.3 82 45 335 41.4 83 45 345 40.4 84 45 355 38.6 85 35 5 33.7 86 35 15 29.0 87 35 25 28.6 88 35 35 35.2 97 35 125 38.1 98 35 135 35.0 99 35 145 36.7 100 35 155 37.0 101 35 165 37.0 102 35 175 37.5 103 35 185 35.6 104 35 195 36.3 105 35 205 38.9 106 35 215 42.1 107 35 225 45.3 108 35 235 41.7 109 35 245 50.3 112 35 275 35.1 113 35 285 34.3 114 35 295 35.7 115 35 305 34.2 116 35 315 32.4 117 35 325 33.0 118 35 335 37.2 119 35 345 40.7 120 35 355 34.1 124 25 35 28.1 126 25 55 34.2 127 25 65 41.5 128 25 75 39.5 129 25 85 42.5 131 25 105 37.8 132 25 115 34.4 133 25 125 32.9 134 25 135 31.0 135 25 145 32.1 136 25 155 33.6 137 25 165 33.5 138 25 175 35.8 139 25 185 35.9 140 25 195 37.8 141 25 205 39.0 142 25 215 44.3 143 25 225 50.1 144 25 235 48.1 145 25 245 37.1 146 25 255 34.0 147 25 265 31.7 148 25 275 31.0 149 25 285 32.9 150 25 295 33.5 151 25 305 32.2 152 25 315 32.3 153 25 325 34.5 154 25 335 38.5 155 25 345 37.8 160 15 35 33.5 161 15 45 35.0 162 15 55 35.3 163 15 65 40.4 164 15 75 39.5 165 15 85 41.4 166 15 95 42.5 167 15 105 36.6 168 15 115 35.7 169 15 125 34.3 170 15 135 35.4 171 15 145 35.9 172 15 155 36.8 173 15 165 35.4 174 15 175 38.3 175 15 185 37.6 176 15 195 38.3 177 15 205 36.9 178 15 215 41.5 179 15 225 43.5 180 15 235 43.0 181 15 245 39.2 182 15 255 35.1 183 15 265 34.6 184 15 275 35.8 185 15 285 35.6 186 15 295 34.2 187 15 305 36.0 188 15 315 35.7 189 15 325 39.4 190 15 335 39.7 191 15 345 37.2 193 5 5 45.8 197 5 45 35.9 198 5 55 35.6 199 5 65 35.1 200 5 75 34.9 201 5 85 35.5 202 5 95 37.4 203 5 105 33.6 204 5 115 33.1 205 5 125 35.1 206 5 135 35.5 207 5 145 36.2 208 5 155 37.2 209 5 165 37.0 210 5 175 37.6 211 5 185 35.6 212 5 195 36.7 213 5 205 35.6 214 5 215 36.8 215 5 225 35.7 216 5 235 35.8 217 5 245 40.5 218 5 255 42.9 219 5 265 43.0 220 5 275 45.0 221 5 285 43.1 223 5 305 35.1 224 5 315 35.9 225 5 325 35.2 226 5 335 36.9 227 5 345 42.4 228 5 355 44.1 229 -5 5 43.4 230 -5 15 49.8 232 -5 35 35.8 233 -5 45 36.3 234 -5 55 37.6 235 -5 65 36.0 236 -5 75 37.3 237 -5 85 33.4 238 -5 95 37.1 239 -5 105 33.9 240 -5 115 29.0 241 -5 125 29.9 242 -5 135 34.0 243 -5 145 33.9 244 -5 155 35.8 245 -5 165 36.8 246 -5 175 35.0 247 -5 185 33.4 248 -5 195 33.9 249 -5 205 34.0 250 -5 215 32.9 251 -5 225 32.6 252 -5 235 31.8 253 -5 245 31.9 254 -5 255 36.9 255 -5 265 38.7 256 -5 275 56.4 260 -5 315 34.3 261 -5 325 35.0 262 -5 335 35.1 263 -5 345 33.4 264 -5 355 35.0 265 -15 5 47.4 266 -15 15 45.9 268 -15 35 32.5 269 -15 45 30.7 270 -15 55 38.0 271 -15 65 37.9 272 -15 75 38.1 273 -15 85 40.9 274 -15 95 39.2 275 -15 105 36.4 276 -15 115 31.3 277 -15 125 28.2 278 -15 135 32.5 279 -15 145 34.4 280 -15 155 36.7 281 -15 165 37.5 282 -15 175 39.3 283 -15 185 36.8 284 -15 195 34.1 285 -15 205 33.2 286 -15 215 36.8 287 -15 225 32.9 288 -15 235 32.5 289 -15 245 34.7 290 -15 255 38.0 291 -15 265 45.9 292 -15 275 67.9 293 -15 285 53.6 297 -15 325 35.1 298 -15 335 37.6 299 -15 345 38.3 300 -15 355 44.7 301 -25 5 42.1 302 -25 15 35.7 304 -25 35 32.8 305 -25 45 34.5 306 -25 55 34.4 307 -25 65 35.2 308 -25 75 36.3 309 -25 85 37.7 310 -25 95 38.2 311 -25 105 36.4 312 -25 115 36.3 315 -25 145 29.4 316 -25 155 33.8 317 -25 165 35.4 318 -25 175 35.2 319 -25 185 36.6 320 -25 195 34.9 321 -25 205 37.1 322 -25 215 39.0 323 -25 225 38.1 324 -25 235 34.3 325 -25 245 35.3 326 -25 255 39.7 327 -25 265 37.5 328 -25 275 47.1 329 -25 285 38.0 332 -25 315 34.3 333 -25 325 34.9 334 -25 335 36.9 335 -25 345 35.1 336 -25 355 40.7 337 -35 5 43.0 338 -35 15 36.6 339 -35 25 35.0 340 -35 35 35.8 341 -35 45 38.5 342 -35 55 38.2 343 -35 65 42.0 344 -35 75 41.9 345 -35 85 40.9 346 -35 95 41.1 347 -35 105 40.6 348 -35 115 42.0 349 -35 125 38.8 350 -35 135 40.1 351 -35 145 41.1 352 -35 155 36.5 353 -35 165 38.9 354 -35 175 36.2 355 -35 185 37.8 356 -35 195 38.7 357 -35 205 39.8 358 -35 215 40.9 359 -35 225 42.5 360 -35 235 41.1 364 -35 275 59.0 365 -35 285 46.6 367 -35 305 41.0 368 -35 315 42.8 369 -35 325 38.5 370 -35 335 40.9 371 -35 345 40.0 372 -35 355 44.8 387 -45 145 39.6 388 -45 155 42.8 389 -45 165 41.5 390 -45 175 37.1 391 -45 185 47.4 398 -45 255 55.7 400 -45 275 59.9 401 -45 285 51.3 402 -45 295 44.5 403 -45 305 49.2 404 -45 315 50.1 423 -55 290 44.8 424 -55 310 51.2 425 -55 330 56.5