Secret Garden Musk Climber. It blooms like crazy for months and months and will handle damp weather without balling (when the petals stick together and do not open up). Excellent disease resistance and not fussy at all. 'Sally Holmes' is similar but SGMC blooms 10 times as much.

The big drawback is you may get tired of deadheading it because it blooms so much.

I would normally say 'Sombreuil', but I think it would have trouble opening the flowers in your wet spring weather.

On the right hand side in this photo, on the arch:

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Here is a link that might be useful: SGMC blog post

It's lovely, hoovb. Thanks. It looks like a single, is it? The only single I have right now is a groundcover and I love the simple look.

Secret Garden will also give you copious orange, elongated small hips with a tremendous, sweet, soapy scent which can carry for yards in the garden on warm, moist air. Don't worry about pruning, because you can shear this sucker with hedge clippers and it will laugh at your attempts to control it! Here, it flowers twelve months of the year and just keeps growing...and growing...and...! Kim

Martine Guillot can get pretty big. I got mine from Roses Unlimited.

Here is a link that might be useful: Martine Guillot

Sombreuil is now classed as a LF Climber. (Previously, it was mistakenly classed as an OGR, but it often won prizes as an OGR.) It offers beautiful white blooms.

Most whites don't do well for me, they brown too easily. We have damp springs and hot,dry summers, too. But my Madame de Sombreuilli does well for me. I spray it about every 4-6 weeks but it's far from a prima donna. It gets large for me (I do minimal pruning). I have the clematis Polish Spirit growing thru it and they seem happy together.

Another white that looks promising for me is Sally Holmes, it's not a climber, though.

Dennis, in a milder climate, Sally Holmes is very much a climbing shrub. I've grown it freestanding where it created a huge shrub. I also have had it on a patio cover where it covered nearly the entire patio, and four are currently covering block walls and wrought iron fences in two friends' gardens. She regularly throws out eight foot canes, terminated with huge flower clusters. She's completely suited for pegging and horizontal training as you would any climber. It all depends upon length of growing season, available resources and how sharp your pruning shears are. Kim

Secret Garden Musk Climber is one of our best climbers. I should caution, however, that it can be troubled by blackspot, where that is a problem. Also, it was not cold-hardy for Paul Barden in Oregon. Paul recommended for his area Darlow's Enigma. These issues might not be of concern to you, in which case, ignore. :-)

Take a look at an older Austin rose, Windrush. Here in my PNW garden it is lovely through much of the summer. IT has a heavy June bloom then a smattering of big single flowers with a soft fragrance.Mine is along a fence and grows about 6-7' tall. I thought I had lost many of my older Austins after this past winter but most are making a nice comeback from their roots. I am not sure about Windrush but I sure hope it is! The flowers have a wonderful delicacy like white butterflies fluttering in the wind. Mine is probably7-8' tall, not as tall as Teasing Georgia or Graham Thomas. Its more like a small tree.

Thanks, RoseSeek, I did not know that, thanks. I have it in a large tomato cage (5'h, 3'wide) so it doesn't get trampled but maybe I'll just leave it there.

Another well liked white is Alba Semiplena. Mine is still small so it's hard for me to judge. Even though it is a once bloomer I've come to appreciate it's vigor and the blue-green, disease-free foliage. It also is supposed to have a good display of hips but mine's too small yet.

Ilse Krohn Superior, for a large winter hardy climber and repeat bloom.

Prosperity, which is a Hybrid Musk for a shorter climber that repeats well.

Ideally, I'd suggest you wait until this spring and see if you can pick yourself up a new Kordes white climber called 'Hella'. It is not available here yet, but I'm hoping either Pickering or Palatine nurseries carries it this spring with their new introductions. I have a friend i England who has been growing this rose since its introduction in Europe and she tells me this rose blooms and repeats heavily, but the best part is, never suffers from disease in what is a high BS and mildew pressure situation. Rainy climate and wall/foundation planting. Makes sense, given it is already ADR certified.

Here is a link to it:
http://www.gartenrosen.de/gartenrose-hella