Because weather, in the sense of clouds and sunshine, is quite variable in Duluth and many other parts of Minnesota, many people joke about it with the title phrase.
On a larger scale, one can see this with the five-day forecasts. Three days out might be sunny and four days out might be snow. Then later three days out has rain and four days out is sunny. This happens because weather systems are chaotic; an upper wind can change direction pushing a weather system further north or further south, or speed it up or slow it down.
Even within a day's forecast, the weather can vary. The forecast may call for rain and the day starts sunny; carry your umbrella, the clouds haven't arrived yet. Conversely, the forecast may call for sunny and the day starts out overcast. Don't cancel your picnic; the skies will probably clear.
We had a sample of this for the last two days. Yesterday, Friday, was predicted to be sunny, and today was predicted to be rainy. When we stopped at Bixby's yesterday for coffee and our lunch for our cabin stay, the sky was gray, gray, gray. One of our friends kidded about the non-sunny day we had ahead of us. I retorted that it would change.
Sure enough, by noon it was sunny in Brimson. I was hauling some stuff down a trail and looked at the blue, blue sky through the notch in the trees. I almost stopped to take a picture to show our friend.
Today was predicted to be rainy, and it was. But not all day and when it did rain it wasn't heavy. We had many times with no rain or just a light mist. We wore rain jackets outside most of the time, but often they remained dry. On the other hand, we didn't notice the rain much until we looked at our jackets.
Surprisingly, we accomplished more today than we did yesterday, even recognizing we worked outside only in the afternoon yesterday, and both morning and afternoon today.
BTW, we do lots of work in brush and tree cutting, but we also take walks and just stand still enjoying being outdoors.
Or listening to or watching critters. I heard scratching on one of our sheds. Oh boy, has something gotten inside; I thought I had it squirrel-proofed. I walked over to the shed and a red squirrel was splayed out on the vertical service. As I approached, he spun around to face one way looking for escape. Then he spun around the other way. I clucked at him and he dashed down to the ground and ran around the shed. When I got back to the cabin, I heard him making his territorial chatter. So there, big guy!