Middle Creek Wildlife Management Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Middle Creek Wildlife Management Area clear sky chart from 2005-11-06 to 2024-02-25.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.

Observation Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(no limit)	Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

By Month

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

		Occurrence of each Forecast	Data Points
Cloud Cover	Day	15% 7% 3 6% 5% 3 5% 5% 6% 7% 39%	78407
	Night	16% 6% 3 5% 5% 3 4 5% 5% 7% 41%	80875
Transparency	Day	43% 5% 12% 23% 14% 2	78119
	Night	42% 5% 12% 24% 15% 2	80697
Seeing	Day	22% 13% 28% 22% 12% 4	13906
	Night	20% 12% 28% 28% 11% 1	23411

By Month

Percentage Cloud Cover NE (2006-)
Color Meanings: Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	14% 8% 3 6% 5% 3 4 4 5% 6% 41%	2517
	11th to 20th	Day	15% 11% 5% 9% 7% 3 4 4 5% 6% 30%	2684
	21st to end	Day	19% 11% 4 8% 6% 4 4 3 4 5% 32%	3124
February	1st to 10th	Day	15% 8% 3 6% 6% 4 6% 5% 5% 6% 36%	1710
	11th to 20th	Day	15% 8% 3 7% 6% 3 4 4 6% 7% 38%	1744
	21st to end	Day	20% 9% 3 7% 5% 3 5% 4 4 5% 36%	1520
March	1st to 10th	Day	13% 5% 3 5% 6% 4 4 5% 6% 6% 44%	1859
	11th to 20th	Day	17% 6% 3 5% 6% 4 4 5% 6% 8% 36%	1980
	21st to end	Day	21% 7% 3 5% 5% 3 4 4 4 6% 38%	2259
April	1st to 10th	Day	16% 7% 3 6% 5% 3 4 5% 5% 7% 39%	2160
	11th to 20th	Day	16% 6% 3 5% 4 3 4 5% 5% 7% 42%	2134
	21st to end	Day	18% 5% 2 5% 6% 3 5% 5% 6% 8% 39%	2160
May	1st to 10th	Day	17% 7% 2 5% 6% 4 5% 5% 5% 7% 35%	2328
	11th to 20th	Day	20% 6% 3 5% 5% 3 5% 4 5% 7% 36%	2478
	21st to end	Day	14% 7% 3 5% 5% 3 6% 5% 6% 8% 39%	2725
June	1st to 10th	Day	13% 5% 3 6% 5% 3 5% 6% 6% 10% 38%	2520
	11th to 20th	Day	13% 7% 2 5% 5% 4 6% 5% 7% 8% 38%	2520
	21st to end	Day	11% 4 2 5% 5% 4 5% 5% 7% 12% 41%	2520
July	1st to 10th	Day	10% 5% 2 6% 7% 4 6% 6% 8% 10% 36%	2520
	11th to 20th	Day	7% 5% 2 5% 6% 4 6% 7% 7% 9% 43%	2520
	21st to end	Day	10% 6% 3 6% 7% 4 6% 5% 6% 9% 37%	2632
August	1st to 10th	Day	11% 5% 2 5% 7% 4 6% 6% 8% 9% 36%	2327
	11th to 20th	Day	12% 6% 3 5% 5% 4 5% 5% 7% 9% 39%	2188
	21st to end	Day	13% 4 3 5% 4 4 5% 5% 7% 9% 41%	2376
September	1st to 10th	Day	16% 6% 2 5% 4 3 4 5% 4 7% 43%	2160
	11th to 20th	Day	12% 4 2 4 4 3 4 4 6% 7% 49%	2160
	21st to end	Day	18% 7% 3 6% 4 3 5% 4 4 6% 40%	1922
October	1st to 10th	Day	18% 6% 3 4 4 3 4 4 6% 7% 43%	1800
	11th to 20th	Day	18% 5% 3 6% 4 3 5% 4 4 7% 44%	1800
	21st to end	Day	18% 6% 3 5% 4 2 3 5% 5% 7% 42%	1970
November	1st to 10th	Day	14% 6% 2 4 3 2 3 4 4 8% 49%	1671
	11th to 20th	Day	17% 4 2 5% 5% 3 4 4 5% 7% 45%	1701
	21st to end	Day	16% 5% 2 5% 5% 3 5% 5% 5% 8% 42%	1520
December	1st to 10th	Day	19% 9% 2 6% 6% 3 4 4 6% 6% 35%	1520
	11th to 20th	Day	20% 7% 3 5% 4 3 4 4 5% 7% 38%	1906
	21st to end	Day	18% 7% 3 8% 6% 4 5% 5% 6% 7% 31%	2772
January	1st to 10th	Night	15% 7% 3 6% 5% 3 4 5% 5% 8% 39%	4429
	11th to 20th	Night	18% 8% 3 5% 4 3 4 4 5% 7% 38%	4271
	21st to end	Night	22% 9% 3 7% 5% 2 3 3 4 6% 35%	4532
February	1st to 10th	Night	16% 8% 3 5% 5% 3 5% 5% 5% 7% 38%	2470
	11th to 20th	Night	17% 7% 3 6% 5% 4 5% 4 4 6% 39%	2320
	21st to end	Night	18% 7% 4 5% 6% 2 5% 4 4 6% 39%	1831
March	1st to 10th	Night	14% 5% 2 4 5% 3 4 4 5% 8% 45%	2083
	11th to 20th	Night	17% 8% 2 5% 5% 3 4 5% 4 5% 43%	1979
	21st to end	Night	18% 7% 4 4 4 3 4 4 5% 7% 41%	2096
April	1st to 10th	Night	18% 6% 3 4 6% 3 4 4 6% 7% 38%	1800
	11th to 20th	Night	15% 5% 3 5% 5% 3 4 4 5% 8% 43%	1775
	21st to end	Night	19% 6% 2 5% 4 2 3 5% 5% 6% 43%	1800
May	1st to 10th	Night	19% 7% 3 5% 4 3 5% 5% 4 7% 37%	1647
	11th to 20th	Night	18% 6% 2 7% 5% 3 4 5% 5% 7% 37%	1415
	21st to end	Night	14% 6% 3 5% 5% 3 5% 5% 6% 8% 40%	1550
June	1st to 10th	Night	14% 5% 3 6% 4 3 4 4 6% 8% 42%	1440
	11th to 20th	Night	13% 5% 3 5% 4 4 5% 5% 7% 9% 40%	1440
	21st to end	Night	11% 4 2 4 5% 3 5% 5% 6% 10% 44%	1440
July	1st to 10th	Night	9% 6% 3 6% 7% 4 6% 6% 7% 9% 37%	1440
	11th to 20th	Night	7% 4 2 5% 5% 3 6% 5% 8% 10% 45%	1440
	21st to end	Night	9% 5% 2 5% 5% 3 6% 7% 6% 10% 40%	1682
August	1st to 10th	Night	9% 6% 2 5% 6% 3 5% 6% 8% 9% 42%	1611
	11th to 20th	Night	12% 5% 2 6% 6% 4 6% 5% 6% 7% 40%	1695
	21st to end	Night	12% 6% 2 4 4 3 5% 6% 6% 9% 43%	1980
September	1st to 10th	Night	14% 6% 3 5% 5% 4 3 3 4 7% 46%	1800
	11th to 20th	Night	13% 5% 2 4 3 2 4 5% 5% 7% 51%	1800
	21st to end	Night	17% 6% 2 5% 5% 3 5% 4 5% 5% 43%	2032
October	1st to 10th	Night	20% 6% 2 5% 4 3 4 3 4 6% 44%	2160
	11th to 20th	Night	16% 5% 2 5% 4 2 4 3 5% 6% 46%	2160
	21st to end	Night	19% 5% 2 4 4 3 3 4 5% 8% 45%	2384
November	1st to 10th	Night	12% 5% 2 3 4 2 4 4 4 6% 52%	2407
	11th to 20th	Night	15% 6% 3 5% 4 2 4 4 4 6% 45%	2474
	21st to end	Night	15% 4 2 5% 5% 3 4 5% 5% 8% 44%	2660
December	1st to 10th	Night	19% 7% 3 6% 5% 3 5% 4 5% 6% 36%	2660
	11th to 20th	Night	17% 6% 3 6% 5% 3 5% 5% 5% 7% 39%	3288
	21st to end	Night	18% 8% 3 5% 5% 3 5% 5% 7% 7% 33%	4884

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	43% 4 14% 26% 11% 3	2518
	11th to 20th	Day	51% 7% 10% 17% 13% 2	2684
	21st to end	Day	54% 5% 11% 21% 8% 1	3124
February	1st to 10th	Day	47% 6% 12% 23% 11% 1	1710
	11th to 20th	Day	46% 5% 9% 24% 14% 2	1753
	21st to end	Day	51% 4 8% 22% 11% 4	1520
March	1st to 10th	Day	41% 4 12% 27% 14% 2	1862
	11th to 20th	Day	46% 5% 10% 20% 15% 4	1980
	21st to end	Day	48% 4 8% 20% 17% 3	2259
April	1st to 10th	Day	43% 4 10% 22% 16% 5%	2160
	11th to 20th	Day	40% 6% 11% 23% 16% 5%	2134
	21st to end	Day	43% 5% 11% 21% 16% 5%	2160
May	1st to 10th	Day	46% 6% 9% 21% 15% 3	2328
	11th to 20th	Day	47% 6% 11% 21% 13% 3	2482
	21st to end	Day	42% 7% 14% 23% 12% 2	2725
June	1st to 10th	Day	40% 7% 12% 24% 15% 1	2520
	11th to 20th	Day	41% 7% 14% 24% 11% 3	2520
	21st to end	Day	35% 7% 15% 26% 15% 1	2520
July	1st to 10th	Day	40% 7% 12% 23% 15% 2	2450
	11th to 20th	Day	35% 7% 14% 27% 16% 2	2445
	21st to end	Day	41% 8% 11% 22% 16% 2	2485
August	1st to 10th	Day	41% 7% 12% 24% 15% 1	2314
	11th to 20th	Day	40% 6% 14% 22% 16% 2	2188
	21st to end	Day	39% 6% 12% 24% 16% 3	2376
September	1st to 10th	Day	41% 5% 11% 20% 18% 4	2160
	11th to 20th	Day	33% 4 10% 27% 22% 4	2160
	21st to end	Day	46% 5% 7% 19% 21% 2	1922
October	1st to 10th	Day	41% 4 12% 25% 17% 1	1800
	11th to 20th	Day	41% 4 10% 24% 19% 2	1800
	21st to end	Day	41% 5% 10% 25% 17% 2	1970
November	1st to 10th	Day	36% 3 13% 25% 19% 4	1671
	11th to 20th	Day	40% 4 10% 24% 20% 2	1701
	21st to end	Day	41% 5% 12% 31% 10% 2	1520
December	1st to 10th	Day	49% 4 15% 19% 11% 1	1520
	11th to 20th	Day	44% 5% 13% 29% 8% 1	1906
	21st to end	Day	50% 5% 13% 21% 9% 1	2772
January	1st to 10th	Night	43% 4 12% 27% 11% 3	4429
	11th to 20th	Night	44% 5% 13% 24% 11% 2	4271
	21st to end	Night	51% 4 9% 26% 9% 1	4532
February	1st to 10th	Night	46% 4 13% 25% 11% 2	2470
	11th to 20th	Night	46% 4 9% 20% 18% 2	2322
	21st to end	Night	46% 4 9% 21% 15% 4	1831
March	1st to 10th	Night	38% 4 12% 26% 18% 3	2093
	11th to 20th	Night	44% 4 10% 22% 16% 4	1980
	21st to end	Night	43% 4 9% 20% 19% 4	2096
April	1st to 10th	Night	45% 4 10% 21% 16% 4	1800
	11th to 20th	Night	39% 6% 10% 21% 20% 3	1775
	21st to end	Night	42% 5% 10% 22% 17% 6%	1800
May	1st to 10th	Night	45% 6% 10% 21% 15% 3	1647
	11th to 20th	Night	46% 7% 11% 15% 18% 2	1416
	21st to end	Night	41% 7% 15% 20% 15% 2	1551
June	1st to 10th	Night	40% 6% 10% 22% 20% 1	1440
	11th to 20th	Night	38% 7% 15% 24% 14% 2	1440
	21st to end	Night	34% 7% 15% 28% 15% 2	1440
July	1st to 10th	Night	43% 7% 14% 19% 14% 3	1400
	11th to 20th	Night	33% 7% 15% 27% 16% 2	1392
	21st to end	Night	35% 9% 15% 23% 16% 2	1588
August	1st to 10th	Night	36% 7% 15% 25% 16% 1	1600
	11th to 20th	Night	42% 7% 14% 19% 17% 2	1695
	21st to end	Night	37% 5% 14% 23% 18% 3	1980
September	1st to 10th	Night	39% 5% 11% 23% 18% 4	1800
	11th to 20th	Night	32% 5% 9% 25% 25% 4	1800
	21st to end	Night	42% 5% 8% 20% 22% 3	2032
October	1st to 10th	Night	44% 3 10% 25% 16% 2	2160
	11th to 20th	Night	37% 5% 11% 29% 17% 2	2160
	21st to end	Night	39% 4 9% 28% 18% 2	2384
November	1st to 10th	Night	32% 5% 12% 27% 20% 4	2407
	11th to 20th	Night	40% 3 9% 25% 18% 5%	2474
	21st to end	Night	38% 4 13% 28% 15% 2	2660
December	1st to 10th	Night	48% 4 12% 22% 13% 1	2660
	11th to 20th	Night	44% 5% 12% 22% 14% 3	3288
	21st to end	Night	47% 6% 14% 23% 9%	4884

Seeing (when cloud cover <= 80%)
Color Meanings: Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	32% 22% 26% 14% 6%	180
	11th to 20th	Day	33% 24% 31% 10% 3	227
	21st to end	Day	27% 27% 29% 13% 2 1	297
February	1st to 10th	Day	27% 25% 31% 13% 3	270
	11th to 20th	Day	32% 22% 37% 8% 1	351
	21st to end	Day	35% 17% 31% 15% 1	362
March	1st to 10th	Day	24% 23% 32% 18% 3	420
	11th to 20th	Day	26% 25% 30% 13% 4 1	420
	21st to end	Day	27% 22% 29% 15% 5% 2	462
April	1st to 10th	Day	26% 21% 28% 17% 7% 1	420
	11th to 20th	Day	25% 19% 27% 18% 7% 3	412
	21st to end	Day	28% 14% 33% 17% 5% 2	420
May	1st to 10th	Day	27% 16% 27% 19% 7% 3	423
	11th to 20th	Day	22% 16% 31% 21% 8% 2	447
	21st to end	Day	19% 7% 27% 24% 19% 5%	485
June	1st to 10th	Day	17% 12% 28% 24% 16% 4	450
	11th to 20th	Day	21% 9% 27% 25% 14% 3	450
	21st to end	Day	14% 10% 30% 28% 13% 5%	450
July	1st to 10th	Day	13% 4 21% 29% 23% 9%	445
	11th to 20th	Day	8% 3 22% 34% 24% 8%	444
	21st to end	Day	13% 3 29% 31% 17% 6%	488
August	1st to 10th	Day	14% 3 24% 28% 21% 10%	446
	11th to 20th	Day	16% 4 20% 30% 21% 10%	439
	21st to end	Day	13% 4 22% 34% 16% 11%	495
September	1st to 10th	Day	21% 6% 19% 25% 19% 9%	450
	11th to 20th	Day	14% 4 22% 29% 17% 13%	450
	21st to end	Day	22% 11% 23% 23% 16% 5%	450
October	1st to 10th	Day	24% 6% 25% 22% 18% 6%	450
	11th to 20th	Day	19% 14% 28% 22% 14% 2	450
	21st to end	Day	22% 15% 33% 21% 9% 1	489
November	1st to 10th	Day	19% 12% 28% 26% 12% 3	365
	11th to 20th	Day	21% 19% 30% 21% 8% 1	361
	21st to end	Day	24% 18% 36% 14% 7% 1	180
December	1st to 10th	Day	26% 22% 33% 12% 6% 1	180
	11th to 20th	Day	29% 22% 31% 14% 4 1	180
	21st to end	Day	31% 18% 26% 17% 8% 1	198
January	1st to 10th	Night	21% 20% 36% 19% 4	760
	11th to 20th	Night	26% 18% 30% 23% 4	760
	21st to end	Night	19% 20% 36% 23% 3	836
February	1st to 10th	Night	22% 19% 31% 26% 2	760
	11th to 20th	Night	24% 23% 35% 16% 2	743
	21st to end	Night	25% 22% 33% 18% 3	611
March	1st to 10th	Night	20% 18% 35% 22% 4	720
	11th to 20th	Night	25% 19% 30% 20% 5% 1	720
	21st to end	Night	21% 16% 36% 21% 6%	792
April	1st to 10th	Night	23% 19% 33% 20% 5%	720
	11th to 20th	Night	19% 14% 34% 25% 8%	711
	21st to end	Night	22% 13% 31% 26% 7%	720
May	1st to 10th	Night	23% 9% 29% 29% 9%	567
	11th to 20th	Night	19% 8% 30% 32% 10% 1	354
	21st to end	Night	17% 4 24% 36% 16% 2	389
June	1st to 10th	Night	16% 4 25% 36% 18%	360
	11th to 20th	Night	15% 4 26% 41% 14%	360
	21st to end	Night	11% 3 23% 47% 14% 1	360
July	1st to 10th	Night	12% 2 20% 41% 23% 2	350
	11th to 20th	Night	10% 2 16% 43% 27% 2	348
	21st to end	Night	11% 2 19% 41% 25% 1	502
August	1st to 10th	Night	14% 1 12% 44% 26% 3	537
	11th to 20th	Night	15% 4 13% 36% 29% 3	631
	21st to end	Night	16% 2 17% 36% 27% 3	792
September	1st to 10th	Night	16% 3 21% 33% 23% 3	720
	11th to 20th	Night	16% 4 17% 33% 26% 4	720
	21st to end	Night	21% 5% 20% 31% 21% 2	720
October	1st to 10th	Night	23% 6% 20% 28% 18% 4	720
	11th to 20th	Night	20% 9% 26% 31% 14%	720
	21st to end	Night	23% 11% 28% 27% 10% 1	792
November	1st to 10th	Night	15% 11% 29% 31% 13% 1	740
	11th to 20th	Night	18% 18% 27% 27% 8% 1	760
	21st to end	Night	18% 17% 32% 26% 8%	760
December	1st to 10th	Night	26% 17% 30% 21% 6%	760
	11th to 20th	Night	20% 16% 35% 25% 5%	760
	21st to end	Night	23% 17% 30% 29% 2	836

Page generated at 2024-02-22 06:05:47. Version ac07

Copyright 2024 Attilla Danko