Do you need to know, when is the best time to go to Normandy? Then you should take a look here, what weather you can expect there during the year.
Normandy is part of France. France is quite a large country, so the climate is diverse here. Most of the low-lying areas of France are in the oceanic climate zone, so you can generally expect cool winters and mild summers. But there are mild winters and hot summers along the Mediterranean. In most overseas regions of France you can expect a tropical climate.
When speaking about the usual weather in this area, the information is relevant for example for these popular places: Alençon, Argentan, Arromanches les Bains, Avranches, Bayeux, Caen, Cherbourg en Cotentin, Coutances, Deauville, Dieppe, Falaise, Giverny, Granville, Honfleur, Le Havre, Les Andelys, Lisieux, Lower Normandy, Mont Saint Michel, Ouistreham, Rouen, Saint Lô, Sainte Mère Église, Sallenelles, Trouville sur Mer, Upper Normandy, Vire, Étretat, Évreux.
Let's look now what weather you can expect in the area around Caen and in many other cities. The warmest month here is August, the average maximum temperature is 22.6 ℃ (72.68 ℉). The average minimum temperature in this month is 12.7 ℃ (54.86 ℉). The coldest month here is February, the average maximum temperature is 8.4 ℃ (47.12 ℉). The average minimum temperature in this month is 2.5 ℃ (36.5 ℉). 
When travelling around Normandy, always consider the altitude of the the place as well. We should remind you, that the highest point in France is Mont Blanc (4810 m) and the lowest point is Rhone River delta (-2 m). So there are huge differences in altitudes in this country and the weather is very different in them therefore. Keep in mind, that the temperature usually decreases by 1.2 - 1.9 ℃ (2.2 - 3.5 ℉) per 200 m (656 ft), depending on the other conditions. (And we should add, that in the very special condition named thermal inversion even the temperature may be higher in higher altitudes.)
Typical (usual) weather in Normandy in January is this: The average highest temperature in Normandy in January is 8.6 ℃ (47.48 ℉). The average lowest temperature is 2.9 ℃ (37.22 ℉). At the beginning of January you can expect higher temperatures, the average highest temperature is around 8.7 ℃ (47.66 ℉). At the end of January you can expect lower temperatures, the average highest temperature is around 8.5 ℃ (47.3 ℉). The average rainfall is 62.5 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 8:16 (hours and minutes), in the middle of the month 8:39 and at the end of the month 9:19.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Normandy in February is this: The average highest temperature in Normandy in February is 8.4 ℃ (47.12 ℉). The average lowest temperature is 2.5 ℃ (36.5 ℉). At the beginning of February you can expect higher temperatures, the average highest temperature is around 8.5 ℃ (47.3 ℉). At the end of February you can expect higher temperatures, the average highest temperature is around 9.75 ℃ (49.55 ℉). The average rainfall is 57.9 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 9:19 (hours and minutes), in the middle of the month 10:07 and at the end of the month 11:00.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Normandy in March is this: The average highest temperature in Normandy in March is 11.1 ℃ (51.98 ℉). The average lowest temperature is 3.7 ℃ (38.66 ℉). At the beginning of March you can expect lower temperatures, the average highest temperature is around 9.75 ℃ (49.55 ℉). At the end of March you can expect higher temperatures, the average highest temperature is around 12 ℃ (53.6 ℉). The average rainfall is 57.3 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 11:00 (hours and minutes), in the middle of the month 11:54 and at the end of the month 12:49.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Normandy in April is this: The average highest temperature in Normandy in April is 12.9 ℃ (55.22 ℉). The average lowest temperature is 5.4 ℃ (41.72 ℉). At the beginning of April you can expect lower temperatures, the average highest temperature is around 12 ℃ (53.6 ℉). At the end of April you can expect higher temperatures, the average highest temperature is around 14.55 ℃ (58.19 ℉). The average rainfall is 45.6 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 12:49 (hours and minutes), in the middle of the month 13:43 and at the end of the month 14:33.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.
Typical (usual) weather in Normandy in May is this: The average highest temperature in Normandy in May is 16.2 ℃ (61.16 ℉). The average lowest temperature is 8.3 ℃ (46.94 ℉). At the beginning of May you can expect lower temperatures, the average highest temperature is around 14.55 ℃ (58.19 ℉). At the end of May you can expect higher temperatures, the average highest temperature is around 17.95 ℃ (64.31 ℉). The average rainfall is 57.9 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 14:33 (hours and minutes), in the middle of the month 15:18 and at the end of the month 15:53.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Normandy in June is this: The average highest temperature in Normandy in June is 19.7 ℃ (67.46 ℉). The average lowest temperature is 11 ℃ (51.8 ℉). At the beginning of June you can expect lower temperatures, the average highest temperature is around 17.95 ℃ (64.31 ℉). At the end of June you can expect higher temperatures, the average highest temperature is around 20.95 ℃ (69.71 ℉). The average rainfall is 52.3 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 15:53 (hours and minutes), in the middle of the month 16:11 and at the end of the month 16:11.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.
Typical (usual) weather in Normandy in July is this: The average highest temperature in Normandy in July is 22.2 ℃ (71.96 ℉). The average lowest temperature is 12.9 ℃ (55.22 ℉). At the beginning of July you can expect lower temperatures, the average highest temperature is around 20.95 ℃ (69.71 ℉). At the end of July you can expect higher temperatures, the average highest temperature is around 22.4 ℃ (72.32 ℉). The average rainfall is 47.2 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 16:11 (hours and minutes), in the middle of the month 15:51 and at the end of the month 15:16.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Normandy in August is this: The average highest temperature in Normandy in August is 22.6 ℃ (72.68 ℉). The average lowest temperature is 12.7 ℃ (54.86 ℉). At the beginning of August you can expect lower temperatures, the average highest temperature is around 22.4 ℃ (72.32 ℉). At the end of August you can expect lower temperatures, the average highest temperature is around 21.65 ℃ (70.97 ℉). The average rainfall is 47.6 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 15:16 (hours and minutes), in the middle of the month 14:31 and at the end of the month 13:41.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Normandy in September is this: The average highest temperature in Normandy in September is 20.7 ℃ (69.26 ℉). The average lowest temperature is 11.1 ℃ (51.98 ℉). At the beginning of September you can expect higher temperatures, the average highest temperature is around 21.65 ℃ (70.97 ℉). At the end of September you can expect lower temperatures, the average highest temperature is around 18.8 ℃ (65.84 ℉). The average rainfall is 60.4 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 13:41 (hours and minutes), in the middle of the month 12:48 and at the end of the month 11:54.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Normandy in October is this: The average highest temperature in Normandy in October is 16.9 ℃ (62.42 ℉). The average lowest temperature is 8.7 ℃ (47.66 ℉). At the beginning of October you can expect higher temperatures, the average highest temperature is around 18.8 ℃ (65.84 ℉). At the end of October you can expect lower temperatures, the average highest temperature is around 14.15 ℃ (57.47 ℉). The average rainfall is 69.3 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 11:54 (hours and minutes), in the middle of the month 11:00 and at the end of the month 10:08.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Normandy in November is this: The average highest temperature in Normandy in November is 11.4 ℃ (52.52 ℉). The average lowest temperature is 5.3 ℃ (41.54 ℉). At the beginning of November you can expect higher temperatures, the average highest temperature is around 14.15 ℃ (57.47 ℉). At the end of November you can expect lower temperatures, the average highest temperature is around 10.1 ℃ (50.18 ℉). The average rainfall is 85.2 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 10:08 (hours and minutes), in the middle of the month 9:20 and at the end of the month 8:41.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Normandy in December is this: The average highest temperature in Normandy in December is 8.8 ℃ (47.84 ℉). The average lowest temperature is 3.6 ℃ (38.48 ℉). At the beginning of December you can expect higher temperatures, the average highest temperature is around 10.1 ℃ (50.18 ℉). At the end of December you can expect lower temperatures, the average highest temperature is around 8.7 ℃ (47.66 ℉). The average rainfall is 70.7 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 8:41 (hours and minutes), in the middle of the month 8:16 and at the end of the month 8:12.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.