This report describes the historical weather record at the Newport News/Williamsburg International Airport (Newport News, Virginia, United States) during 1977. This station has records back to December 1972.
Newport News, Virginia has a warm humid temperate climate with hot summers and no dry season. The area within 25 mi of this station is covered by forests (42%), oceans and seas (34%), croplands (10%), built-up areas (8%), and lakes and rivers (6%)
Daylight saving time (DST) was observed at Newport News, Virginia during 1977. There were two time changes during 1977:
1977 was not a leap year, so it has 365 days and no February 29th. The first leap year before 1977 was 1976 and the first after was 1980.
The summer and winter solstices and the spring and fall equinoxes mark the passing of the seasons. They fall on nearly the same day each year, with differences of a day or two depending on the year. In 1977 they occurred on:
|Spring Equinox||Sunday, 20 March 1977.|
|Summer Solstice||Tuesday, 21 June 1977.|
|Fall Equinox||Friday, 23 September 1977.|
|Winter Solstice||Wednesday, 21 December 1977.|
The hottest day of 1977 was August 7, with a high temperature of 99°F. For reference, on that day the average high temperature is 87°F and the high temperature exceeds 94°F only one day in ten. The hottest month of 1977 was July with an average daily high temperature of 89°F.
Relative to the average, the hottest day was February 26. The high temperature that day was 79°F, compared to the average of 54°F, a difference of 25°F. In relative terms the warmest month was March, with an average high temperature of 64°F, compared to an typical value of 59°F.
The longest warm spell was from August 5 to August 18, constituting 14 consecutive days with warmer than average high temperatures. The month of August had the largest fraction of warmer than average days with 74% days with higher than average high temperatures.
The coldest day of 1977 was January 17, with a low temperature of 5°F. For reference, on that day the average low temperature is 30°F and the low temperature drops below 18°F only one day in ten. The coldest month of 1977 was January with an average daily low temperature of 21°F.
Relative to the average, the coldest day was January 17. The low temperature that day was 5°F, compared to the average of 30°F, a difference of 25°F. In relative terms the coldest month was January, with an average low temperature of 21°F, compared to an typical value of 31°F.
The longest cold spell was from January 1 to January 25, constituting 25 consecutive days with cooler than average low temperatures. The month of January had the largest fraction of cooler than average days with 94% days with lower than average low temperatures.
The clearest month of 1977 was February, with 50% of days being more clear than cloudy. The longest spell of clear weather was from February 6 to February 12, constituting 7 consecutive days that were clearer than they were cloudy.
The cloudiest month of 1977 was November, with 60% of days being more cloudy than clear. The longest spell of cloudy weather was from November 21 to December 3, constituting 13 consecutive days that were cloudier than they were clear.
This station provides hourly reports of significant weather events at and around the station, but does not report the quantity of precipitation at the station itself. This is common for weather stations located outside of the United States, and for a small subset of stations in the United States that are located at lesser used and smaller airports.
This station reports when significant weather events (including precipitation) are visually observed at or near the station. Such events do not always correspond to measured quantities of liquid equivalent precipitation, such as when the event is near by not at the station, or in the case of solid precipitation that does not melt in the collection basin.
The day in 1977 with the most precipitation observations was October 26. There were 19 hourly weather reports that day (out of a maximum of 24) in which some form of precipitation was observated at or near the station. The month with the most precipitation observations was October, with 103 hourly present weather reports involving some form of precipitation.
As determined by the present weather reports, the longest dry spell was from April 6 to April 24, constituting 19 consecutive days with no observed precipitation. The month with the largest fraction of days without observed precipitation was September, with 80% of days reporting no observed precipitation at all.
The month with the largest fraction of days with at least some observed precipitation was November, with 63% of days reporting some observed precipitation.
In this section we consider only those weather reports that indicate liquid precipitation. For the purposes of this analysis, we include thunderstorms even though some thunderstorms are not accompanied by liquid precipitation.
The month of 1977 with the largest number of those reports was October, with a total of 103 reports. The day with the largest number of those reports was October 26, with a total of 19 reports.
This station reports when snow is observed falling but does not report the quantity of snow that has fallen or the depth of snow on the ground.
In this section we consider hourly weather reports that contain an observation of falling snow. These reports do not necessarily correspond to accumulation.
The first reported snow fall in 1977 was on December 28; the last was on February 18. The month of 1977 with the largest number of those reports was January, with a total of 43 reports. The day with the largest number of those reports was January 5, with a total of 11 reports.
Humidity is an important factor in determining how weather conditions feel to a person experiencing them. Hot and humid days feel even hotter than hot and dry days because the high level of water content in humid air discourages the evaporation of sweat from a person's skin.
When reading the graph below, keep in mind that the hottest part of the day tends to be the least humid, so the daily low (brown) traces are more relevant for understanding daytime comfort than the daily high (blue) traces, which typically occur during the night. Applying that observation, the least humid month of 1977 was February with an average daily low humidity of 33%, and the most humid month was November with an average daily low humidity of 61%.
But it is important to keep in mind that humidity does not tell the whole picture and the dew point is often a better measure of how comfortable a person will find a given set of weather conditions. Please see the next section for continued discussion of this point.
Dew point is the temperature below which water vapor will condense into liquid water. It is therefore also related to the rate of evaporation of liquid water. Since the evaporation of sweat is an important cooling mechanism for the human body, the dew point is an important measurement for understanding how dry, comfortable, or humid a given set of weather conditions will feel.
Generally speaking, dew points below 50°F will feel a bit dry to some people, but comfortable to people accustomed to dry conditions; dew points from 50°F to 68°F are fairly comfortable to most people, and dew points above 68°F are increasingly uncomfortable, becoming oppressive around 77°F.
To take some examples, and basing our categorization on the daily high dew point in 1977, January had 27 dry days, no comfortable days, and no humid days; April had 11 dry days, 17 comfortable days, and 2 humid days; July had no dry days, 2 comfortable days, and 29 humid days; and October had 5 dry days, 22 comfortable days, and 4 humid days.
The highest sustained wind speed was 34 mph, occurring on July 21; the highest daily mean wind speed was 17 mph (April 5); and the highest wind gust speed was 52 mph (January 28).
The windiest month was March, with an average wind speed of 10 mph. The least windy month was September, with an average wind speed of 6 mph.
Visibility is the maximum distance at which a given reference object or light can be clearly discerned. In the United States, visibilities that are greater than or equal to 10 miles are typically reported as 10 miles.
The day of 1977 with the lowest average visibility was November 30, with an average visibility of 1.1 mi. The month with the lowest average visibility was July, with an average visibility of 6.6 mi. With an average visibility of 9.5 mi, the month of January had the highest average visibility.
The cloud ceiling is the altitude of the lowest layer of clouds that are at categorized as broken (mostly cloudy) or overcast (cloudy). If no such cloud layer exists then the ceiling is unlimited and no value is reported.
The day of 1977 with the lowest average cloud ceiling was May 18, with an average cloud ceiling of 49'. The month with the lowest average cloud ceiling was November, with an average cloud ceiling of 7125'. The month of September has the highest average cloud ceiling, with an average cloud ceiling of 14656'.