Climate in Bourne
Like the rest of the UK, Bourne is influenced by a number of different air masses, these being the maritime polar air mass (from the north), continental polar air mass (from the east), continental tropical air mass (from the south) and the maritime tropical air mass (from the west). This results in a varied and often unpredictable climate. Usually, however, Bourne is most influenced by the maritime tropical air mass from the Atlantic, driven by a fast ribbon of air high up in the atmosphere known as the jet-stream, which drives warmer air from the Gulf of Mexico to the UK across the Atlantic Ocean, along with weather fronts. This means Bourne is sometimes susceptible to fast moving low pressure systems, contributing to wet and overcast conditions, and keeping temperatures mild in the winter - much more so than what would normally be expected considering the latitude, which is on par with southern Canada. Due to its southeasterly position, during the summer when the jet-stream often moves further north (the jet stream tends to follow the sun, hence why it moves north in the summer), Bourne is more susceptible to the tropical air masses from the near continent, often resulting in warm, dry conditions for the town. The dominating air mass can greatly affect the range of temperatures and general weather conditions, and this is why it is so difficult to predict the general pattern of weather for any particular time of year.
Spring in Bourne (March - June)
The official start of spring in Bourne is 20th March, and it's at this time of year that as the daylight increases and temperatures begin to rise, the trees and flowers begin to bug and the lush green countryside that Bourne and the rest of Lincolnshire is renowned for, comes back to life.
Early spring tends to begin on the rather cool side, with an average high temperature of just 10℃ in March - although as the sun becomes stronger and the number of daylight hours increases day-by-day, sunny days can feel rather pleasant after what can seem like a long, bleak winter. Night time temperatures during early spring can, however, still drop well into single figures and this can result in some overnight frosts. Some minimal snowfall has also been known during early spring, but it is very unlikely that the snow will settle.
As the season progresses, temperatures really start to warm up nicely, with an average high of around 16℃ during late spring. At this time of year, the days become much longer than the nights, with the sun not setting until well into the evening and rising in the early hours of the morning. The sun is also very strong, so any sunny days can feel rather warm, even hot on occasions.
The most common weather trend during spring is sunshine and showers, especially during April - hence why the weather in April is often referred to as April showers. As the season progresses, however, the showery conditions do tend to subside and sunshine becomes more of a prominent feature - the month of May, for example, can see long periods of dry, settled conditions.
Summer in Bourne (June - September)
The warmest mouths tend to be June, July and August were the average high temperature typically ranges between 18℃ to 22℃. The warmest period will generally be experienced in late July and early August were the town is likely to see average high temperatures of a very pleasant 22 to 23℃. On occasions temperatures do peek into the upper twenties, but rarely reach above 30℃ (a temperature of 30℃ or more is likely to be recorded on around two days each summer). Bourne tends to experience the highest temperatures during settled spells when the wind direction is from a southerly direction as this pulls up warm or hot air from places such as Spain, Africa and the Azores. As a general rule, Bourne has a pleasant climate during summer, with temperatures rarely reaching levels that would be considered too hot. It can, however, be humid in the summer and so at times even relatively low temperatures can seem sticky and uncomfortable - this makes it particularly difficult to sleep at night as the majority of homes in Bourne do not have the benefit of air conditioning. The highest temperature ever recorded in Bourne was 36.0℃ in July 2015.
There are usually plenty of warm and sunny days to be had during the summer months, and certainly during dry, settled periods, it's not uncommon for temperatures to hover into the mid to late twenties for concurrent days, feeling more like you're in the Mediterranean than England. Good weather during summer can never be guaranteed, however, with rain and general overcast conditions sometimes being a prominent feature of the weather, which can lead to some disappointing summers.
The sun reaches its highest point in the sky during the end of June (the Summer Solstice is on the 21st June) and so at this time of year the days are at their longest in Bourne. In late June, for example, it doesn't get completely dark until gone 10.00pm and is light again by 5.00am. The long days during summer make this the time of year when many outdoor events take place in Bourne and the surrounding villages. On a warm sunny day, you'll see many people out and about enjoying the many green spaces around the town, and cooling off in the large outdoor swimming pool.
Autumn in Bourne (September - December)
September the 22nd marks the first day of Autumn in Bourne and as we head into this stage of the year the days become shorter. As the days are shorter, the sun has less time to heat the land and temperatures tend to become cooler. This said, September still sees an average high of around 18℃, and certainly in early Autumn the weather can still remain pleasant. There is often, however, a distant chill in the air during early mornings and nights, and it's at this time of year that a jacket may become necessary when venturing out.
Autumn is generally a wet and windy time in Bourne as the town tends to see more weather fronts being introduced from the Atlantic Ocean due to a strong jet stream that tends to position itself over the UK at this time of year. Gale force winds and heavy rain become a common feature in Autumn, and it is likely that the town will see the odd storm during this period.
As we head into late autumn temperatures really start to drop and it can feel chilly during the day and cold overnight. Late autumn sees an average high of just 8℃, with overnight frosts becoming a more common feature. It's also not unheard of for there to be a minimal amount of snow at the end of the season, although this is quite rare.
Winter in Bourne (December - March)
The coldest months tend to be December, January and February, were temperatures typically peak at around 5 - 8℃ during the day and frosts become common overnight. Despite the northerly latitude of Bourne, winters are generally quite mild, with temperatures rarely dropping below 0℃ during the day, and snow fall normally minimal - usually Bourne gets no more than a light covering of snow and this is most likely to occur from mid January to the beginning of March. There in fact palm trees that are able to grow and survive in Bourne due to the mild winter climate. On occasions, however, when the predominate southwesterly maritime air mass becomes blocked, Bourne does experience periods of very cold weather during winter, were more substantial snow fall and freezing temperatures may be experienced. This was apparent in the winters of 2010/2011 and 2011/2012, were several weeks of sustained freezing temperatures, significant snow fall, and widespread ice were experienced in Bourne due to much colder air being imported in from the east.
The number of rainy days during winter tends to be more than the rest of the year and there can be concurrent days of grey days to contend with, however, the sun does still make an appearance at this time of year and there can be some lovely crisp sunny days. Sunny days, however, tend to give-way to clear nights and this is when the temperature can drop well into single figures, sometimes leading to freezing temperatures.
Daylight hours during winter months are minimal and as a result days can seem short and dull - on average Bourne sees just eight hours of daylight in the winter months with darkness setting in as early as 3.30pm in December.
Rain in Bourne is generally distributed evenly through-out the year, with a slight increase during the autumn and winter months (peaking in October) - it will generally rain on average for half the days in each month - although this may be in the form of showers and it will generally not rain all day (although this cannot be ruled out!). Due to Bourne's location in the south east of the country, however, rainfall tends to be less than that of other parts of the UK as it further away from the influences of the low pressure systems that are brought in from the Atlantic Ocean - most of these tend to have fizzled out or at least lost a lot of their moisture by the time they reach Bourne. In fact, it is not uncommon, certainly in the summer months, for Bourne to experience dry periods with little rainfall. The south east of the country is also thought to receive the most amount of sunshine and this is reflected in Bourne, with periods of sunny conditions not uncommon.
Extreme weather such as tornados, hurricanes, floods and droughts are virtually unheard of in Bourne, but there have been a few occasions in history were such events have been recorded. Due to the flat terrain around Bourne, the town is sometimes subject to strong winds, especially during the autumn.
If you're planning on visiting Bourne, the advice is to prepare for all kinds of weather - no matter what time of year you're here. Due to the instability of the weather here, it is very rare that one type of weather pattern will prevail for more than a week at a time and some weeks it's possible to experience several different types of weather and variation of temperatures - one day it can be sunny and warm and the next it can be raining and chilly. High pressure does sometimes dominate our weather but even then a subtle shift in the position of this can lead to a considerable drop or increase in the temperature and cloud cover.
As a general rule, if you're visiting Bourne in the summer, it should be warm enough to wear a t-shirt most days (maybe even shorts!) - but it's also recommended to keep a jacket to hand as rain is still fairly common at this time of the year. It's also recommended to keep a jumper handy for the evenings and overnight as even in the height of summer, it can still feel a little chilly in the evening and overnight. In winter, warm clothing and a thick coat is recommended to protect against the cold and wet - although there may be some days during sunnier and settled spells were a jumper should suffice. In spring and autumn, you may need clothing to suit all weathers - some days it may be warm and dry enough to wear just a t-shirt, whereas other days you may find yourself wanting to wrap up warm in a nice thick coat. Obviously though this will depend somewhat on what stage of the season we are at - early spring, for example, is almost certain to still be on the chilly side!