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 2025-04-26.

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% 2 6% 4 4 4 4 6% 7% 39%	113673
	Night	16% 7% 2 6% 4 4 4 4 5% 7% 41%	114922
Transparency	Day	42% 5% 11% 24% 16% 3	117295
	Night	41% 4 11% 24% 17% 3	119463
Seeing	Day	22% 13% 28% 22% 11% 4	15446
	Night	20% 12% 28% 28% 11% 1	24934

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	12% 7% 3 9% 5% 5% 4 3 5% 6% 42%	3597
	11th to 20th	Day	13% 10% 4 11% 6% 4 4 3 5% 6% 34%	3815
	21st to end	Day	16% 8% 3 9% 5% 5% 4 3 4 5% 37%	4466
February	1st to 10th	Day	15% 9% 3 7% 6% 5% 6% 4 5% 6% 35%	1800
	11th to 20th	Day	16% 9% 3 8% 5% 4 4 3 6% 6% 37%	1839
	21st to end	Day	19% 9% 3 7% 4 4 5% 3 4 6% 36%	1650
March	1st to 10th	Day	20% 4 2 5% 4 4 4 3 5% 5% 43%	4650
	11th to 20th	Day	11% 6% 2 7% 5% 5% 5% 4 5% 7% 42%	4980
	21st to end	Day	18% 7% 2 5% 4 4 4 3 5% 6% 42%	5685
April	1st to 10th	Day	17% 8% 2 7% 5% 4 4 4 6% 7% 37%	2400
	11th to 20th	Day	16% 7% 2 5% 5% 4 4 4 5% 7% 41%	2374
	21st to end	Day	17% 6% 2 7% 4 4 4 4 6% 7% 40%	2340
May	1st to 10th	Day	27% 7% 2 6% 4 4 5% 3 5% 7% 30%	4096
	11th to 20th	Day	24% 9% 3 7% 5% 5% 4 3 6% 7% 28%	4398
	21st to end	Day	12% 5% 2 5% 4 4 4 4 6% 9% 44%	4837
June	1st to 10th	Day	12% 6% 2 6% 5% 4 5% 5% 7% 10% 38%	2660
	11th to 20th	Day	12% 7% 2 6% 5% 5% 6% 4 7% 8% 39%	2660
	21st to end	Day	11% 5% 2 5% 5% 5% 5% 4 7% 11% 41%	2660
July	1st to 10th	Day	6% 5% 2 7% 6% 7% 7% 6% 9% 10% 36%	4440
	11th to 20th	Day	9% 6% 2 7% 4 5% 5% 6% 7% 9% 40%	4440
	21st to end	Day	11% 8% 3 7% 6% 6% 6% 5% 7% 8% 35%	4607
August	1st to 10th	Day	19% 7% 2 6% 5% 5% 5% 4 7% 8% 32%	4104
	11th to 20th	Day	14% 6% 2 5% 4 4 5% 4 7% 9% 41%	3831
	21st to end	Day	13% 5% 2 5% 3 3 4 3 5% 8% 48%	4180
September	1st to 10th	Day	16% 6% 2 5% 4 4 4 4 4 6% 45%	2280
	11th to 20th	Day	12% 4 2 5% 4 4 3 3 6% 7% 50%	2280
	21st to end	Day	20% 8% 3 7% 4 4 5% 3 4 5% 38%	2028
October	1st to 10th	Day	18% 7% 2 4 3 4 4 3 6% 6% 43%	1900
	11th to 20th	Day	17% 5% 2 6% 3 3 4 3 4 7% 46%	1900
	21st to end	Day	17% 6% 2 5% 4 3 3 4 5% 7% 43%	2079
November	1st to 10th	Day	13% 6% 2 5% 3 3 3 2 5% 7% 50%	1761
	11th to 20th	Day	16% 5% 1 5% 5% 3 4 3 5% 7% 45%	1790
	21st to end	Day	16% 6% 2 6% 4 4 5% 3 5% 8% 42%	1600
December	1st to 10th	Day	14% 8% 2 6% 4 4 4 4 6% 6% 41%	2600
	11th to 20th	Day	21% 10% 2 4 3 3 4 3 5% 7% 39%	2986
	21st to end	Day	18% 7% 2 7% 5% 4 5% 4 6% 8% 34%	3960
January	1st to 10th	Night	12% 7% 2 6% 4 4 5% 4 5% 8% 43%	6349
	11th to 20th	Night	14% 7% 2 5% 4 4 4 3 5% 7% 43%	6065
	21st to end	Night	17% 8% 2 7% 4 3 3 3 5% 7% 41%	6490
February	1st to 10th	Night	16% 8% 3 6% 5% 4 5% 4 5% 7% 38%	2600
	11th to 20th	Night	17% 8% 3 7% 4 5% 5% 3 4 6% 39%	2445
	21st to end	Night	18% 7% 3 6% 5% 4 4 3 5% 7% 38%	1980
March	1st to 10th	Night	17% 8% 2 6% 4 4 3 3 4 6% 42%	5185
	11th to 20th	Night	11% 6% 2 6% 4 4 4 3 5% 6% 49%	4979
	21st to end	Night	14% 8% 3 6% 4 4 4 3 5% 6% 43%	5246
April	1st to 10th	Night	18% 7% 3 6% 6% 4 4 4 6% 7% 37%	2000
	11th to 20th	Night	15% 7% 2 6% 4 3 4 4 5% 8% 41%	1975
	21st to end	Night	18% 6% 2 5% 4 3 4 4 5% 7% 44%	1957
May	1st to 10th	Night	25% 8% 2 6% 3 4 4 3 5% 7% 31%	2860
	11th to 20th	Night	24% 9% 3 8% 4 4 3 3 6% 6% 28%	2495
	21st to end	Night	13% 5% 3 6% 4 4 5% 4 6% 10% 41%	2738
June	1st to 10th	Night	14% 6% 3 6% 4 4 4 3 7% 8% 42%	1520
	11th to 20th	Night	12% 5% 2 5% 4 5% 5% 4 8% 10% 41%	1520
	21st to end	Night	11% 5% 2 5% 4 4 5% 4 7% 10% 43%	1520
July	1st to 10th	Night	7% 6% 2 7% 5% 5% 6% 5% 7% 9% 39%	2520
	11th to 20th	Night	8% 6% 2 7% 6% 5% 5% 5% 9% 11% 38%	2520
	21st to end	Night	14% 8% 2 6% 5% 5% 5% 4 6% 8% 37%	2942
August	1st to 10th	Night	20% 7% 2 6% 4 4 4 4 7% 8% 34%	2825
	11th to 20th	Night	14% 6% 2 6% 5% 5% 5% 4 5% 6% 41%	2966
	21st to end	Night	12% 6% 1 4 3 4 4 4 6% 8% 47%	3476
September	1st to 10th	Night	14% 7% 2 5% 5% 4 3 3 4 6% 47%	1900
	11th to 20th	Night	12% 6% 2 5% 3 3 4 4 5% 6% 51%	1900
	21st to end	Night	19% 7% 2 6% 4 4 5% 3 5% 5% 40%	2146
October	1st to 10th	Night	20% 6% 2 5% 3 4 3 3 3 6% 44%	2280
	11th to 20th	Night	15% 5% 2 6% 3 3 3 3 5% 6% 48%	2280
	21st to end	Night	18% 5% 1 4 3 3 2 3 5% 7% 46%	2517
November	1st to 10th	Night	11% 5% 1 4 4 3 4 3 5% 6% 53%	2537
	11th to 20th	Night	15% 7% 2 6% 4 3 4 3 5% 6% 45%	2605
	21st to end	Night	15% 5% 2 6% 5% 4 4 4 5% 8% 43%	2800
December	1st to 10th	Night	12% 8% 3 7% 4 4 4 3 5% 7% 42%	4580
	11th to 20th	Night	22% 7% 2 5% 3 3 4 3 4 6% 39%	5208
	21st to end	Night	19% 8% 3 6% 5% 4 5% 4 5% 6% 35%	6996

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% 3 10% 25% 17% 2	3598
	11th to 20th	Day	49% 5% 8% 19% 15% 4	3848
	21st to end	Day	49% 4 11% 22% 14% 1	4466
February	1st to 10th	Day	48% 6% 12% 23% 11% 1	1800
	11th to 20th	Day	47% 4 9% 24% 13% 2	1848
	21st to end	Day	50% 4 9% 22% 11% 3	1650
March	1st to 10th	Day	42% 4 8% 24% 15% 6%	4653
	11th to 20th	Day	40% 5% 11% 28% 12% 5%	4980
	21st to end	Day	44% 3 9% 18% 21% 4	5685
April	1st to 10th	Day	45% 4 10% 21% 15% 5%	2400
	11th to 20th	Day	41% 5% 11% 22% 16% 4	2374
	21st to end	Day	42% 5% 10% 22% 16% 4	2340
May	1st to 10th	Day	53% 5% 9% 20% 10% 2	4108
	11th to 20th	Day	55% 5% 12% 18% 8% 1	4402
	21st to end	Day	35% 6% 13% 27% 16% 2	4837
June	1st to 10th	Day	39% 7% 12% 25% 15% 1	2660
	11th to 20th	Day	40% 7% 14% 25% 12% 3	2660
	21st to end	Day	35% 7% 15% 26% 16% 1	2660
July	1st to 10th	Day	40% 8% 15% 22% 14% 2	4370
	11th to 20th	Day	38% 6% 15% 26% 13% 1	4365
	21st to end	Day	46% 6% 10% 20% 17% 1	4460
August	1st to 10th	Day	49% 5% 11% 24% 10%	4091
	11th to 20th	Day	39% 4 10% 32% 14% 1	3870
	21st to end	Day	35% 4 10% 29% 20% 2	4180
September	1st to 10th	Day	40% 5% 11% 21% 20% 4	2280
	11th to 20th	Day	33% 4 10% 27% 23% 4	2280
	21st to end	Day	48% 4 7% 18% 20% 2	2028
October	1st to 10th	Day	38% 3 8% 21% 27% 4	3160
	11th to 20th	Day	29% 3 11% 28% 23% 7%	3140
	21st to end	Day	26% 3 12% 27% 28% 3	3405
November	1st to 10th	Day	35% 3 13% 25% 20% 4	1761
	11th to 20th	Day	39% 4 10% 25% 19% 2	1790
	21st to end	Day	41% 5% 12% 30% 10% 2	1600
December	1st to 10th	Day	43% 3 16% 24% 11% 2	2600
	11th to 20th	Day	46% 3 12% 30% 8% 1	2986
	21st to end	Day	47% 5% 13% 21% 13% 1	3960
January	1st to 10th	Night	39% 4 10% 25% 18% 4	6349
	11th to 20th	Night	39% 4 13% 23% 16% 5%	6107
	21st to end	Night	43% 3 11% 25% 16% 2	6490
February	1st to 10th	Night	46% 4 13% 25% 10% 2	2600
	11th to 20th	Night	46% 4 8% 21% 18% 3	2447
	21st to end	Night	46% 4 9% 21% 16% 4	1980
March	1st to 10th	Night	44% 4 9% 23% 13% 8%	5195
	11th to 20th	Night	33% 6% 14% 28% 13% 5%	4980
	21st to end	Night	42% 3 7% 18% 25% 4	5246
April	1st to 10th	Night	46% 4 9% 21% 16% 4	2000
	11th to 20th	Night	41% 6% 11% 20% 20% 3	1975
	21st to end	Night	40% 5% 10% 23% 17% 5%	1957
May	1st to 10th	Night	53% 5% 9% 20% 11% 2	2867
	11th to 20th	Night	55% 6% 13% 14% 10% 1	2496
	21st to end	Night	38% 6% 13% 24% 14% 4	2739
June	1st to 10th	Night	40% 6% 10% 23% 20% 1	1520
	11th to 20th	Night	36% 7% 15% 26% 14% 2	1520
	21st to end	Night	35% 6% 14% 27% 15% 2	1520
July	1st to 10th	Night	40% 7% 16% 18% 14% 5%	2480
	11th to 20th	Night	39% 6% 15% 25% 13% 1	2472
	21st to end	Night	43% 7% 12% 18% 19% 1	2848
August	1st to 10th	Night	47% 5% 17% 20% 9% 1	2814
	11th to 20th	Night	42% 4 11% 25% 16% 1	2993
	21st to end	Night	35% 4 11% 31% 18% 1	3476
September	1st to 10th	Night	39% 5% 10% 23% 20% 4	1900
	11th to 20th	Night	32% 5% 9% 25% 25% 4	1900
	21st to end	Night	45% 5% 8% 19% 21% 3	2146
October	1st to 10th	Night	45% 3 9% 22% 21% 2	3800
	11th to 20th	Night	27% 3 10% 29% 26% 5%	3779
	21st to end	Night	27% 2 11% 33% 24% 3	4141
November	1st to 10th	Night	32% 5% 12% 27% 21% 4	2537
	11th to 20th	Night	40% 3 9% 25% 18% 5%	2605
	21st to end	Night	39% 4 13% 28% 15% 1	2800
December	1st to 10th	Night	42% 3 13% 30% 12% 1	4580
	11th to 20th	Night	46% 4 12% 24% 12% 2	5208
	21st to end	Night	48% 5% 11% 20% 16% 1	6996

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	33% 24% 25% 13% 5%	200
	11th to 20th	Day	34% 23% 31% 9% 2	253
	21st to end	Day	27% 27% 30% 13% 2 1	330
February	1st to 10th	Day	29% 24% 31% 13% 3	300
	11th to 20th	Day	34% 22% 35% 8% 1	386
	21st to end	Day	34% 17% 31% 16% 2	414
March	1st to 10th	Day	26% 22% 31% 17% 4	500
	11th to 20th	Day	26% 25% 30% 13% 4 1	500
	21st to end	Day	27% 21% 32% 13% 5% 2	550
April	1st to 10th	Day	30% 20% 28% 16% 6% 1	500
	11th to 20th	Day	27% 19% 28% 17% 6% 3	492
	21st to end	Day	27% 14% 32% 19% 5% 3	480
May	1st to 10th	Day	28% 16% 26% 19% 8% 3	463
	11th to 20th	Day	22% 15% 30% 21% 9% 2	487
	21st to end	Day	18% 7% 28% 24% 19% 4	529
June	1st to 10th	Day	17% 12% 28% 23% 16% 3	490
	11th to 20th	Day	19% 8% 27% 27% 15% 3	490
	21st to end	Day	14% 9% 31% 28% 12% 5%	490
July	1st to 10th	Day	13% 5% 21% 31% 22% 8%	485
	11th to 20th	Day	8% 4 23% 34% 23% 8%	484
	21st to end	Day	13% 4 30% 31% 17% 6%	532
August	1st to 10th	Day	15% 4 23% 28% 20% 9%	486
	11th to 20th	Day	16% 4 20% 30% 20% 10%	479
	21st to end	Day	13% 4 22% 34% 17% 11%	539
September	1st to 10th	Day	20% 7% 20% 25% 19% 9%	490
	11th to 20th	Day	14% 4 21% 30% 18% 13%	490
	21st to end	Day	26% 11% 22% 22% 15% 4	490
October	1st to 10th	Day	23% 7% 25% 22% 17% 6%	490
	11th to 20th	Day	18% 15% 29% 21% 14% 3	490
	21st to end	Day	20% 14% 32% 22% 10% 2	532
November	1st to 10th	Day	18% 12% 30% 26% 11% 3	395
	11th to 20th	Day	20% 19% 31% 22% 7% 1	390
	21st to end	Day	28% 18% 34% 13% 7% 1	200
December	1st to 10th	Day	27% 22% 34% 12% 6% 1	200
	11th to 20th	Day	31% 20% 32% 13% 4 1	200
	21st to end	Day	29% 18% 26% 18% 8%	220
January	1st to 10th	Night	22% 21% 36% 18% 4	800
	11th to 20th	Night	25% 18% 30% 23% 4	800
	21st to end	Night	18% 20% 37% 22% 2	880
February	1st to 10th	Night	22% 19% 33% 25% 2	800
	11th to 20th	Night	26% 23% 34% 16% 2	783
	21st to end	Night	24% 21% 33% 19% 3	660
March	1st to 10th	Night	22% 19% 34% 21% 4	800
	11th to 20th	Night	24% 20% 30% 21% 5% 1	800
	21st to end	Night	21% 17% 36% 21% 5%	880
April	1st to 10th	Night	24% 19% 33% 19% 5%	800
	11th to 20th	Night	20% 14% 34% 24% 7%	791
	21st to end	Night	21% 13% 32% 26% 8%	783
May	1st to 10th	Night	25% 9% 29% 28% 9%	597
	11th to 20th	Night	20% 8% 30% 32% 9% 1	374
	21st to end	Night	17% 4 25% 37% 16% 2	411
June	1st to 10th	Night	16% 5% 25% 36% 19%	380
	11th to 20th	Night	14% 4 26% 42% 13%	380
	21st to end	Night	12% 3 24% 46% 14% 1	380
July	1st to 10th	Night	11% 2 21% 42% 22% 2	370
	11th to 20th	Night	10% 2 18% 42% 27% 2	368
	21st to end	Night	11% 3 19% 41% 25% 1	531
August	1st to 10th	Night	14% 1 12% 43% 26% 3	567
	11th to 20th	Night	14% 4 13% 37% 28% 3	667
	21st to end	Night	16% 2 17% 36% 27% 2	836
September	1st to 10th	Night	16% 4 21% 33% 22% 3	760
	11th to 20th	Night	15% 4 17% 33% 27% 4	760
	21st to end	Night	23% 5% 20% 30% 20% 2	760
October	1st to 10th	Night	23% 7% 20% 28% 18% 4	760
	11th to 20th	Night	19% 9% 26% 32% 14% 1	760
	21st to end	Night	22% 11% 27% 29% 11%	836
November	1st to 10th	Night	15% 11% 30% 31% 12% 1	780
	11th to 20th	Night	18% 18% 28% 27% 8% 1	800
	21st to end	Night	18% 18% 33% 25% 7%	800
December	1st to 10th	Night	25% 16% 31% 21% 6%	800
	11th to 20th	Night	21% 16% 34% 25% 5%	800
	21st to end	Night	23% 16% 29% 29% 2	880

Page generated at 2025-04-23 09:25:03. Version ac07

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