The best time to go to Namibia is during the dry season, between April and November: it's warm and sunny throughout the country. Those readers with allergies would be better off, however, putting off their trip until the first few weeks of November or the month of April: there may be showers here and there, but they won't stop you enjoying the trip and you'll run into fewer tourists. Do make sure, however, to avoid the rainy season.
We travelled for 3 weeks through the country, encountered animals everywhere. The whole country of Namibia is a big 'zoo'!
Nice, friendly people and staff everywhere. Lodges were well chosen and beautiful. Food delicious.