Why the ground water is hot in winter and cold in summer?
96783
The water itself isn’t any hotter or colder, it’s exactly the same temperature. It just feels hotter or colder because air is cooler or warmer.\nThe ground has a very stable temperature, and more than a few feet under in most places and the temperature varies by just a couple of degrees all year round. That’s; why wine and vegetables are commonly store din cellars, to protect them from the heat and cold. Water in the ground has an equally stable temperature.\n\nSo in summer the water is going to be several degree cooler than the air, and so it will feel cold. In winter despite being the same actual temperature it will be several degrees warmer than the air, and will fel warm.
115181
Heat from the sun that warms water in the Oceans, rivers,and lakes. The water evaporates goes up inot the clouds, evaporated watre dropplets cling to dust particles in the atmoshpere, These become clouds, and as soon as enough water is clinging to one drop it beginn, rivers to rain, as if the clouds are to heavy to hold anymore. If it is cold then it will snow. This falls to the ground and (if snow melts) runs into the ocean rivers and lakes. REpeat Process with heat from the sun. ^^
664364
There's actually a number of reasons why water does that. Yes, cooler or warmer water can come in and make water differ in temperature in different parts of the body of water. Another reason is that water takes a lot longer to cool or heat than many other things like the earth. The depth of the water makes an impact also. The sun's rays passing through the water faster at different depths heat water when it's not as deep.
804973
A fundamental axiom: cold air is heavier than warm air.\n\nThus, cold air sinks (like into a valley) and hot air rises.\n\nHowever, the temperature gradient (how temperature changes with increasing altitude) is negative.  This means air gets colder as altitude increases.  So what we have is cold air at altitude pushing down on warm air near ground level.\n\nThe warm air heat comes from the ground, which is heated by our Sun.  In summer, there is a lot more of that solar energy to heat the ground and lower air in the valley than in winter.  Thus, the valley air is warm.  In fact, the weight of the colder upper air contributes a little bit to the heat below because a gas under pressure does heat up.  But in winter, when there is far less solar energy and resulting heat, the naturally colder air above settles into the valley.  \n\nBoth the cold and warm air are more or less trapped in the valley because of the hills or mountains surrounding it.  Thus, the cold air stays colder because no warm air is blown from the surroundings into the valley.  And the warm air stays warmer because no cold air is blown into it.
17885
In Saratoga Springs, NY where it can get very cold (and Olmpic Speed Skaters have competed on an oval rink) the ground is sprayed with water and allowed to freeze in a natural shallow basin that was bulldozed into an oval track with land in the middle.  Water can then be sprayed on top of the original ice layer to thicken it without melting through.  When the ice layer is thick enough, the entire area can be slowly flooded.  The water used is at groundwater temperature from a hydrant using a fire hose.  I believe that groundwater is about 46F here but will vary from city to city as it is basically the average temperature of all the water that seeps into the ground during a typical year.  The lowest temperature of drain water is of course 32F.  Thus the water is only 14F warmer than the ice being layed down and it must be well below freezing to prepare the rink.  A hockey rink could be built the same way by omitting the land in the middle; but it would require more water.\n\nOf course, ice rinks can be located on a lake or pond if it freezes thick enough.  The NY State Park here has a special rectangular rink that merely requires flooding for figure skating and recreation.
1028154
heat in the winter shade in the summer
66544
Salt will lower the freezing point of water. That is why the use in on the roads in winter.
73207
A typical body of water absorbs and releases heat slower than the surface of the earth. That means that if it is hot for many days and then suddenly gets cold, the water will retain the heat longer then the land and the climate will be milder than if there was no water.\n\nThis effect can last for a long time around some bodies of water. For instance the water can retain some of the heat from the summer well into the fall. Of course the flip side is true as well, the water will be cool during the summer. \n\nThe result of all of this is to smooth over rapid ups and down in daily temperature when there is a large body of water near by - and therefore a generally milder climate.\n\n\nAlso important in some areas are ocean currents. Western Europe is kept relatively warm because of the Gulf Stream which brings warm water from near the equator to that region. If the Gulf Stream was ever disrupted, western Europe would generally be colder.
771221
Salt lowers the freezing point of water.  That is why the spread salt when it is cold and snow is falling.  The water will stay liquid at lower temperatures.
464226
Water mixes with water, rather than floating.  However, it is possible for warmer water to STRATIFY from colder - that is, the warmer water is on top while the colder is on the bottom.
141597
If there was no sunshine and no vertical air motion, cold air would settle to the surface, and temperature would increase going up in the atmosphere (and we'd all be dead soon ;) ). Because the ground is always radiating away heat (though often receiving more during daytime from the sun), there is a tendency for that to occur. Note the polar regions for example - during winter there is a semi-permanent temperature inversion (increase of temperature with altitude).\n\n2 things which counter the tendency for inversion are solar heating and vertical air motion.\n\nSunshine heats the ground, heat is conducted to air directly above the ground, and convection transports it up into the atmosphere. Cooling/heating of air by radiation is a slower process, so heat builds as spring and summer progress (at mid & high latitiudes) - especially in the lower atmosphere.\n\nAir moving vertically in the atmosphere (up or down) does so at the adiabatic lapse rate, which is 10 °C per km for dry air and less for saturated air (varies depending with temperature - averages about 6-7°C per km). Rising air cools at that rate, and subsiding air heats at the rate. Thus vertical air motions act to heat the lower atmosphere and cool the higher.\n\nThe combined effect of those, as a few people mentioned, is that temperature on the average decreases with altitude in the troposphere - at a rate of 6.5 °C per km (3.6 °F per 1000 ft.). Yet the lapse rate varies depending on conditions. Air during a clear night normally increases directly above the surface, strong inversions may occur during winter and ahead of warm fronts, and air can decrease at the dry adiabatic rate or briefly greater during a warm, sunny spring day. Etc.
456301
Air is more dense when cold.
311960
Cold tap water is about 50 degrees.  Hot is limited to about 120 to prevent scalding.  100 is what you might consider "warm" water.  There's more distance between cold water temperature and warm (100-50=50 degrees difference) than between hot water and warm (120-100=20 degrees difference)  Just looking at the numbers, you'd have to add 2.5 times as much hot to warm up the cold than the other way around.  (This is the basic idea - a more complicated description would require that I break out my heat transfer book...)
114884
Hot water does not freeze faster than cold, all conditions being the same, such as altitude, air pressure, and amount of cold applied to the water to make the water freeze.
291269
Cold water has more dissolved gases in it than hot water.  Any dissolved solutes cause the freezing point of water to be lower than pure water with nothing dissolved in it.\n\nThis means if your power goes out in the wintertime and it is about 32 degrees F outside, the water in your hot water pipes is more likely to freeze than the water in your cold water pipes.  This is because the freezing point of the water in your hot water pipes is higher than the freezing point of the water in your cold water pipes.\n\nSpeed isn't being considered here.  The cooling process is assumed to be slow so that the pipes are in thermal equilibrium with surroundings.\n\nAlso check out this link.  It is from the Alaska Science Forum.  They can explain the water pipes problem more correctly than me and they have more personal experience with the phenomenon.\nhttp://www.gi.alaska.edu/ScienceForum/ASF4/440.html
348314
warm air and cold air combine to make storms... in the winter there is less warm air
843524
Cold. It's easier for me to get warmer in cold weather than it is to get cool in hot weather. I can't stand hot days.