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London Marathon weather forecast
High pressure will influence the UK’s weather this weekend, but what does that mean for the thousands of people running the TCS London Marathon?
Read moreLlannerch-y-Medd (Isle of Anglesey) weather
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Forecast days
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Today. Maximum daytime temperature: 12 degrees Celsius; Minimum nighttime temperature: 4 degrees Celsius. Clear. Sunrise: ; Sunset: . UV: Moderate; Pollution: Low; Pollen: Low.Today. Maximum daytime temperature: 12 degrees Celsius; Minimum nighttime temperature: 4 degrees Celsius. Clear. Sunrise: ; Sunset: . UV: Moderate; Pollution: Low; Pollen: Low.
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Saturday 20 April. Maximum daytime temperature: 11 degrees Celsius; Minimum nighttime temperature: 3 degrees Celsius. Sunny intervals. Sunrise: ; Sunset: . UV: Moderate; Pollution: Low; Pollen: Low.Saturday 20 April. Maximum daytime temperature: 11 degrees Celsius; Minimum nighttime temperature: 3 degrees Celsius. Sunny intervals. Sunrise: ; Sunset: . UV: Moderate; Pollution: Low; Pollen: Low.
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Sunday 21 April. Maximum daytime temperature: 12 degrees Celsius; Minimum nighttime temperature: 5 degrees Celsius. Cloudy. Sunrise: ; Sunset: . UV: Moderate; Pollution: Low; Pollen: Moderate.Sunday 21 April. Maximum daytime temperature: 12 degrees Celsius; Minimum nighttime temperature: 5 degrees Celsius. Cloudy. Sunrise: ; Sunset: . UV: Moderate; Pollution: Low; Pollen: Moderate.
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Monday 22 April. Maximum daytime temperature: 11 degrees Celsius; Minimum nighttime temperature: 7 degrees Celsius. Cloudy changing to sunny intervals in the afternoon. Sunrise: ; Sunset: . UV: Moderate; Pollution: Low; Pollen: Low.Monday 22 April. Maximum daytime temperature: 11 degrees Celsius; Minimum nighttime temperature: 7 degrees Celsius. Cloudy changing to sunny intervals in the afternoon. Sunrise: ; Sunset: . UV: Moderate; Pollution: Low; Pollen: Low.
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Tuesday 23 April. Maximum daytime temperature: 11 degrees Celsius; Minimum nighttime temperature: 5 degrees Celsius. Cloudy changing to sunny intervals by late morning. Sunrise: ; Sunset: . UV: Moderate; Pollution: Low; Pollen: Low.Tuesday 23 April. Maximum daytime temperature: 11 degrees Celsius; Minimum nighttime temperature: 5 degrees Celsius. Cloudy changing to sunny intervals by late morning. Sunrise: ; Sunset: . UV: Moderate; Pollution: Low; Pollen: Low.
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Wednesday 24 April. Maximum daytime temperature: 11 degrees Celsius; Minimum nighttime temperature: 5 degrees Celsius. Sunny intervals changing to cloudy by late morning. Sunrise: ; Sunset: . UV: Moderate;Wednesday 24 April. Maximum daytime temperature: 11 degrees Celsius; Minimum nighttime temperature: 5 degrees Celsius. Sunny intervals changing to cloudy by late morning. Sunrise: ; Sunset: . UV: Moderate;
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Thursday 25 April. Maximum daytime temperature: 10 degrees Celsius; Minimum nighttime temperature: 5 degrees Celsius. Cloudy changing to sunny intervals by early evening. Sunrise: ; Sunset: . UV: Moderate;Thursday 25 April. Maximum daytime temperature: 10 degrees Celsius; Minimum nighttime temperature: 5 degrees Celsius. Cloudy changing to sunny intervals by early evening. Sunrise: ; Sunset: . UV: Moderate;
Seven day forecast for Llannerch-y-Medd
| Time | 22:00 | 23:00 |
|---|---|---|
| Weather symbols |
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Chance of precipitation
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<5% | <5% |
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8°
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7°
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6° | 5° |
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N
8
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N
7
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23 | 21 |
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G | G |
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Humidity
|
82% | 84% |
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UV
|
- | - |
| Time | 00:00 | 01:00 | 02:00 | 03:00 | 04:00 | 05:00 | 06:00 | 07:00 | 08:00 | 09:00 | 10:00 | 11:00 | 12:00 | 13:00 | 14:00 | 15:00 | 16:00 | 17:00 | 18:00 | 19:00 | 20:00 | 21:00 | 22:00 | 23:00 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Weather symbols |
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Chance of precipitation
|
<5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% |
|
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7°
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6°
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4°
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4°
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5°
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5°
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5°
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6°
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7°
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8°
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9°
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10°
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10°
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11°
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11°
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11°
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10°
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10°
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10°
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9°
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7°
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5°
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4°
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4°
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5° | 4° | 3° | 3° | 3° | 3° | 3° | 4° | 6° | 7° | 8° | 8° | 9° | 9° | 9° | 9° | 9° | 8° | 8° | 8° | 6° | 4° | 3° | 3° |
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NNE
7
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NE
5
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E
4
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SE
4
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SSE
6
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SSE
6
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SE
5
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ESE
5
|
ESE
5
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NW
7
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NNW
6
|
NNW
6
|
N
6
|
N
8
|
N
8
|
N
8
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NNE
8
|
NNE
8
|
NE
7
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NE
6
|
NE
4
|
NE
4
|
NE
4
|
ENE
4
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18 | 13 | 10 | 7 | 9 | 9 | 9 | 10 | 11 | 10 | 9 | 9 | 9 | 11 | 12 | 12 | 12 | 11 | 10 | 9 | 8 | 8 | 7 | 7 |
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G | G | VG | VG | G | VG | VG | VG | VG | VG | VG | VG | VG | VG | VG | VG | VG | VG | VG | VG | VG | VG | VG | VG |
|
Humidity
|
86% | 83% | 80% | 82% | 83% | 80% | 81% | 83% | 82% | 75% | 71% | 69% | 61% | 59% | 59% | 60% | 59% | 60% | 62% | 64% | 74% | 78% | 81% | 79% |
|
UV
|
- | - | - | - | - | - | - | 1 | 1 | 2 | 3 | 3 | 4 | 5 | 4 | 3 | 3 | 2 | 1 | 1 | 1 | - | - | - |
| Time | 00:00 | 01:00 | 04:00 | 07:00 | 10:00 | 13:00 | 16:00 | 19:00 | 22:00 |
|---|---|---|---|---|---|---|---|---|---|
| Weather symbols |
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Chance of precipitation
|
<5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% |
|
|
5°
|
5°
|
4°
|
7°
|
10°
|
11°
|
11°
|
10°
|
7°
|
|
|
3° | 3° | 3° | 6° | 9° | 10° | 9° | 8° | 5° |
|
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ENE
4
|
ENE
4
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E
3
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NE
3
|
N
4
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NNE
7
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NE
8
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NE
7
|
NE
5
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7 | 6 | 7 | 5 | 8 | 12 | 13 | 10 | 8 |
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VG | VG | VG | VG | VG | VG | VG | VG | VG |
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Humidity
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78% | 77% | 83% | 84% | 70% | 68% | 71% | 74% | 86% |
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UV
|
- | - | - | 1 | 3 | 5 | 3 | 1 | - |
| Time | 01:00 | 04:00 | 07:00 | 10:00 | 13:00 | 16:00 | 19:00 | 22:00 |
|---|---|---|---|---|---|---|---|---|
| Weather symbols |
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Chance of precipitation
|
<5% | 10% | 10% | 10% | 10% | <5% | 10% | 10% |
|
|
6°
|
6°
|
8°
|
10°
|
10°
|
11°
|
10°
|
9°
|
|
|
5° | 5° | 6° | 8° | 8° | 8° | 7° | 6° |
|
|
NE
4
|
NNE
3
|
W
4
|
NW
9
|
NNW
13
|
NNW
15
|
N
15
|
N
14
|
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|
7 | 5 | 7 | 16 | 24 | 27 | 25 | 23 |
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G | G | G | VG | G | VG | VG | VG |
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Humidity
|
90% | 92% | 89% | 82% | 81% | 79% | 83% | 90% |
|
UV
|
- | - | 1 | 2 | 3 | 2 | 1 | - |
| Time | 01:00 | 04:00 | 07:00 | 10:00 | 13:00 | 16:00 | 19:00 | 22:00 |
|---|---|---|---|---|---|---|---|---|
| Weather symbols |
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Chance of precipitation
|
10% | 10% | 10% | <5% | <5% | <5% | <5% | <5% |
|
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9°
|
8°
|
8°
|
9°
|
10°
|
10°
|
9°
|
7°
|
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6° | 6° | 6° | 6° | 7° | 7° | 7° | 5° |
|
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N
12
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NNE
11
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NNE
10
|
NE
12
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NNE
13
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NNE
12
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N
10
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N
9
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20 | 18 | 16 | 20 | 24 | 23 | 17 | 14 |
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G | G | VG | VG | VG | VG | VG | VG |
|
Humidity
|
93% | 92% | 83% | 74% | 68% | 64% | 69% | 82% |
|
UV
|
- | - | 1 | 3 | 5 | 3 | 1 | - |
| Time | 01:00 | 04:00 | 07:00 | 10:00 | 13:00 | 16:00 | 19:00 | 22:00 |
|---|---|---|---|---|---|---|---|---|
| Weather symbols |
|
|
|
|
|
|
|
|
|
Chance of precipitation
|
<5% | <5% | <5% | 10% | <5% | <5% | <5% | <5% |
|
|
7°
|
6°
|
7°
|
9°
|
10°
|
10°
|
10°
|
8°
|
|
|
4° | 3° | 4° | 6° | 7° | 7° | 7° | 5° |
|
|
N
9
|
N
9
|
N
10
|
N
13
|
N
14
|
NNW
13
|
NNW
11
|
NNW
11
|
|
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14 | 14 | 16 | 23 | 25 | 23 | 19 | 17 |
|
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VG | VG | VG | VG | VG | VG | VG | VG |
|
Humidity
|
83% | 84% | 82% | 70% | 64% | 63% | 68% | 81% |
|
UV
|
- | - | 1 | 2 | 5 | 2 | 1 | - |
| Time | 01:00 | 04:00 | 07:00 | 10:00 | 13:00 | 16:00 | 19:00 | 22:00 |
|---|---|---|---|---|---|---|---|---|
| Weather symbols |
|
|
|
|
|
|
|
|
|
Chance of precipitation
|
<5% | <5% | 10% | 10% | 10% | 10% | <5% | 10% |
|
|
7°
|
7°
|
7°
|
9°
|
10°
|
10°
|
9°
|
8°
|
|
|
4° | 4° | 4° | 6° | 7° | 7° | 7° | 5° |
|
|
NNW
11
|
N
10
|
N
10
|
NNW
12
|
NW
12
|
NW
11
|
NW
10
|
WNW
10
|
|
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16 | 15 | 15 | 20 | 23 | 20 | 17 | 15 |
|
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VG | G | G | VG | G | VG | VG | G |
|
Humidity
|
82% | 84% | 83% | 73% | 68% | 68% | 72% | 84% |
|
UV
|
- | - | 1 | 2 | 4 | 2 | 1 | - |
Our weather symbols tell you the weather conditions for any given hour in the day or night. This means that the symbol for 9am shows you what you will see from 9am to 10am.
Chance of precipitation represents how likely it is that rain (or other types of precipitation, such as sleet, snow, hail or drizzle) will fall from the sky at a certain time.
This number shows the air temperature for the time period. You can see the temperature in Celsius or Fahrenheit by using the dropdown menu.
Feels like temperature considers other factors, such as wind speed and humidity. This gives you a better idea of how the temperature will actually feel at the time.
Wind gust shows the highest wind speed that you should encounter at that time, as winds peak and lull.
Strong winds are shown in bold for speeds of 29 mph or more.
The arrow shows the direction the wind is blowing. The letters show the direction the wind is blowing from (on a standard 16-point compass).
The number represents the average wind speed expected at that time.
The arrow shows the direction of the wind (up is north). If the arrow points from land to sea, the wind will be blowing out to sea (‘offshore’). The number is the average wind speed.
Beware of offshore winds if you are using inflatables, paddle boards or kayaks. These winds can blow you out to sea. Read more about how wind will affect you at the beach.
Visibility measures the distance at which an object can be clearly seen.
| VP (Very Poor) | Less than 1 km |
| P (Poor) | 1.1 km to 4 km |
| M (Moderate) | 4.1 km to 10 km |
| G (Good) | 10.1 km to 20 km |
| VG (Very Good) | 20.1 km to 40 km |
| E (Excellent) | Greater than 40 km |
Humidity is the amount of water vapor in the air. If there is a lot of water vapour, the humidity will be high. The higher the percentage of humidity, the wetter it will feel outside.
UV exposure index and the protection required to help keep you safe:
No risk of UV - It’s safe to stay outside. Low - You can safely stay outside. Consider sunscreen in direct sunlight. Moderate - Take care during midday hours and do not spend too much time in the sun unprotected. Sunscreen advised. High - Seek shade during midday hours, cover up and wear sunscreen. Very high - Spend time in the shade between 11am and 3pm. Shirt, sunscreen and hat are essential. Extreme - Avoid being outside during midday hours. Shirt, sunscreen and hat essential.
This is the average height of the waves, 1-2 miles out to sea. The height of the waves can vary. The individual waves out to sea or at the beach can be higher than this number. If you are close to the water, keep an eye on the waves to stop you or your belongings being swept away.
Read more about calculating the expected height of the waves at the beach.
This is the average number of seconds between one wave and the next, 1-2 miles out to sea. A long wave period (more than 10 seconds) means the waves at the beach may be more powerful. Lifeguards can give you advice on waves if you’re planning to go into the water.
Read more about the period of waves.
The arrow shows the average direction of the waves 1-2 miles out to sea. It indicates how sheltered the beach will be from these waves. If the arrow points towards land, most of the waves’ power will reach the beach. If the arrow is parallel to or pointing away from land, the wave height is likely to be lower on the beach than it is offshore.
Lifeguards can give you advice on waves if you’re planning to go into the water.
Forecast row information
Llannerch-y-Medd weather map
View the weather with our interactive map
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Wales weather forecast
Headline:
Dry this evening. Clear spells overnight and turning colder.
This Evening and Tonight:
Any showers dying out to leave a dry and largely clear night. Turning colder under the clear skies and lighter winds, with a grass frost likely in places as well as some mist and fog patches. Minimum temperature 0 °C.
Saturday:
A cold but bright start, with a touch of frost. A dry day to follow with cloud gradually building through the afternoon. Feeling pleasant in the sunshine with light winds. Maximum temperature 14 °C.
Outlook for Sunday to Tuesday:
Cloudier on Sunday with patchy rain or showers possible, this continuing into the new week with sunny breaks at times. Generally light winds and temperatures around average.
Updated:
UK long range weather forecast
This period will be dominated by high pressure to the northwest of the UK and lower pressure to the southeast over the near continent, and the extent to which either of these systems dominates at any particular time. The wind will probably therefore predominantly come from a northerly direction, so temperatures overall are likely to remain around or a little below average, with any warmer conditions will generally be further west - and near some eastern coasts it could feel quite cold at times. There should be a reasonable amount of dry weather around, especially in the north and west, but some rain or showers are likely at times, most-likely in the south and east at first, but with an increasing risk elsewhere towards early May.
Updated:
In this period, the chances of unsettled weather are slightly less than usual in the north and about the same as usual further south. Therefore, some spells of wetter weather are likely for all, but perhaps especially southern areas at first with the driest conditions probably further north. Temperatures will probably near or a little below average at first, but likely to recover to around or a little above average through early-mid May. Also worth noting that average temperatures themselves rise by around 1C per week at this time of year.
Updated:
