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 2026-08-30.

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 5% 4 6% 8% 39%	144217
	Night	15% 7% 2 6% 4 4 4 4 5% 7% 41%	137969
Transparency	Day	43% 4 11% 24% 16% 2	147795
	Night	42% 4 11% 24% 16% 3	142479
Seeing	Day	22% 14% 28% 22% 11% 4	17245
	Night	20% 13% 28% 28% 11% 1	26533

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	13% 6% 2 8% 6% 6% 5% 4 5% 6% 39%	4661
	11th to 20th	Day	13% 10% 4 10% 5% 4 4 3 5% 6% 37%	4965
	21st to end	Day	14% 6% 3 8% 5% 6% 5% 4 6% 6% 36%	5780
February	1st to 10th	Day	14% 9% 3 7% 5% 5% 5% 4 6% 6% 36%	1890
	11th to 20th	Day	16% 9% 4 7% 5% 4 4 3 6% 6% 36%	1934
	21st to end	Day	18% 9% 3 7% 4 4 5% 3 4 6% 36%	1730
March	1st to 10th	Day	20% 5% 2 5% 4 4 4 3 5% 5% 42%	4754
	11th to 20th	Day	11% 6% 2 7% 5% 5% 5% 4 5% 7% 42%	5090
	21st to end	Day	17% 7% 2 5% 4 4 4 3 5% 6% 42%	5811
April	1st to 10th	Day	17% 8% 2 7% 5% 4 4 4 6% 7% 38%	2520
	11th to 20th	Day	15% 7% 2 5% 5% 4 4 4 6% 7% 41%	2494
	21st to end	Day	17% 6% 2 7% 4 4 4 4 6% 7% 40%	2520
May	1st to 10th	Day	22% 7% 2 6% 4 4 5% 4 6% 8% 33%	7614
	11th to 20th	Day	20% 7% 2 5% 4 4 4 4 6% 8% 35%	8221
	21st to end	Day	23% 6% 2 5% 4 4 4 3 6% 7% 35%	9060
June	1st to 10th	Day	11% 6% 2 6% 5% 4 5% 5% 6% 9% 39%	2940
	11th to 20th	Day	13% 6% 2 6% 5% 5% 6% 4 7% 9% 39%	2940
	21st to end	Day	11% 5% 2 6% 4 5% 5% 4 7% 11% 41%	2940
July	1st to 10th	Day	10% 7% 2 7% 5% 5% 5% 4 7% 9% 38%	8280
	11th to 20th	Day	9% 7% 2 7% 5% 6% 5% 6% 7% 11% 36%	8280
	21st to end	Day	11% 7% 3 6% 5% 5% 5% 4 7% 9% 40%	8604
August	1st to 10th	Day	19% 7% 2 6% 5% 5% 5% 4 6% 8% 32%	4364
	11th to 20th	Day	14% 6% 2 6% 4 4 5% 4 7% 9% 40%	4078
	21st to end	Day	13% 5% 2 5% 3 4 4 3 5% 8% 49%	4420
September	1st to 10th	Day	15% 6% 2 5% 4 4 4 4 4 6% 46%	2400
	11th to 20th	Day	12% 5% 2 5% 4 4 3 4 6% 7% 49%	2400
	21st to end	Day	19% 8% 3 7% 4 4 4 3 4 5% 37%	2135
October	1st to 10th	Day	17% 6% 2 4 3 4 4 3 6% 6% 45%	2000
	11th to 20th	Day	16% 5% 2 6% 3 3 4 3 4 7% 45%	2000
	21st to end	Day	16% 6% 2 5% 4 3 3 4 5% 7% 44%	2188
November	1st to 10th	Day	13% 6% 2 5% 3 3 3 3 5% 8% 50%	1851
	11th to 20th	Day	16% 5% 1 6% 5% 3 4 3 5% 7% 44%	1879
	21st to end	Day	16% 7% 2 6% 4 4 4 3 5% 8% 41%	1680
December	1st to 10th	Day	14% 8% 2 6% 4 4 4 4 6% 6% 41%	2680
	11th to 20th	Day	20% 10% 2 4 3 3 4 3 5% 7% 39%	3066
	21st to end	Day	18% 7% 2 7% 5% 4 5% 4 6% 8% 34%	4048
January	1st to 10th	Night	11% 8% 3 7% 5% 4 5% 4 6% 8% 40%	8234
	11th to 20th	Night	14% 8% 3 6% 4 4 4 3 5% 7% 42%	7901
	21st to end	Night	14% 7% 2 6% 4 3 3 3 6% 7% 44%	8401
February	1st to 10th	Night	16% 8% 3 6% 5% 4 5% 4 5% 7% 38%	2730
	11th to 20th	Night	17% 8% 3 7% 4 4 5% 3 4 6% 38%	2570
	21st to end	Night	17% 7% 3 6% 5% 4 4 3 5% 7% 39%	2076
March	1st to 10th	Night	18% 8% 2 6% 4 4 3 3 4 5% 42%	5301
	11th to 20th	Night	11% 6% 2 6% 4 4 4 3 5% 6% 49%	5089
	21st to end	Night	14% 7% 3 6% 4 4 4 3 5% 6% 43%	5362
April	1st to 10th	Night	18% 7% 3 6% 6% 4 4 4 6% 7% 37%	2100
	11th to 20th	Night	14% 7% 3 7% 4 4 4 4 5% 8% 41%	2075
	21st to end	Night	18% 6% 2 5% 4 3 3 4 5% 7% 44%	2100
May	1st to 10th	Night	22% 8% 3 6% 4 4 5% 4 5% 7% 32%	5314
	11th to 20th	Night	20% 7% 3 7% 4 4 3 3 6% 8% 35%	4639
	21st to end	Night	25% 7% 3 6% 4 4 4 3 5% 7% 34%	5114
June	1st to 10th	Night	13% 6% 3 6% 4 5% 4 3 6% 8% 43%	1680
	11th to 20th	Night	13% 6% 2 5% 4 5% 5% 4 7% 10% 39%	1680
	21st to end	Night	11% 6% 2 5% 4 4 5% 4 7% 10% 43%	1680
July	1st to 10th	Night	11% 6% 2 8% 4 5% 6% 4 6% 9% 38%	4680
	11th to 20th	Night	9% 7% 3 8% 6% 6% 6% 5% 8% 10% 32%	4680
	21st to end	Night	11% 7% 2 7% 5% 5% 5% 4 6% 9% 40%	5455
August	1st to 10th	Night	20% 7% 2 6% 4 4 4 4 7% 8% 34%	3005
	11th to 20th	Night	14% 6% 2 6% 5% 5% 5% 4 5% 7% 40%	3157
	21st to end	Night	12% 6% 1 5% 3 4 4 4 6% 8% 47%	3677
September	1st to 10th	Night	14% 7% 2 5% 5% 4 4 3 4 6% 48%	2000
	11th to 20th	Night	12% 6% 2 5% 3 3 4 4 5% 6% 50%	2000
	21st to end	Night	19% 7% 2 6% 4 4 5% 3 5% 5% 39%	2259
October	1st to 10th	Night	19% 6% 2 5% 3 4 3 3 3 6% 46%	2400
	11th to 20th	Night	16% 6% 2 6% 3 3 3 3 5% 6% 48%	2400
	21st to end	Night	18% 5% 1 4 3 3 2 3 5% 7% 47%	2650
November	1st to 10th	Night	11% 5% 1 4 4 3 4 3 5% 6% 52%	2667
	11th to 20th	Night	15% 7% 3 6% 4 3 4 3 5% 6% 45%	2735
	21st to end	Night	15% 6% 2 6% 4 4 4 4 5% 8% 42%	2940
December	1st to 10th	Night	12% 8% 3 7% 4 4 4 3 5% 7% 42%	4720
	11th to 20th	Night	22% 7% 2 5% 3 3 4 3 4 6% 39%	5348
	21st to end	Night	19% 8% 3 6% 5% 4 5% 4 5% 6% 35%	7150

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	46% 3 10% 25% 14% 2	4662
	11th to 20th	Day	47% 4 8% 19% 16% 6%	4998
	21st to end	Day	48% 3 12% 23% 13% 1	5780
February	1st to 10th	Day	46% 6% 11% 24% 12% 2	1890
	11th to 20th	Day	48% 4 9% 24% 13% 2	1943
	21st to end	Day	50% 4 9% 23% 11% 3	1730
March	1st to 10th	Day	42% 4 8% 24% 15% 6%	4757
	11th to 20th	Day	40% 5% 11% 27% 12% 5%	5090
	21st to end	Day	44% 3 9% 18% 21% 4	5811
April	1st to 10th	Day	45% 4 10% 21% 15% 5%	2520
	11th to 20th	Day	41% 5% 12% 22% 16% 4	2494
	21st to end	Day	43% 5% 10% 23% 16% 4	2520
May	1st to 10th	Day	49% 4 11% 22% 12% 1	7623
	11th to 20th	Day	46% 4 10% 26% 12% 1	8225
	21st to end	Day	48% 4 9% 23% 14% 1	9061
June	1st to 10th	Day	39% 7% 12% 24% 17% 1	2940
	11th to 20th	Day	40% 6% 14% 25% 12% 3	2940
	21st to end	Day	36% 7% 15% 26% 16% 1	2940
July	1st to 10th	Day	42% 7% 12% 22% 16% 1	8210
	11th to 20th	Day	42% 5% 14% 28% 11% 1	8205
	21st to end	Day	39% 5% 10% 24% 21% 1	8415
August	1st to 10th	Day	49% 5% 11% 24% 10%	4351
	11th to 20th	Day	40% 4 11% 31% 13% 1	4117
	21st to end	Day	34% 4 10% 30% 20% 2	4420
September	1st to 10th	Day	39% 4 11% 21% 20% 4	2400
	11th to 20th	Day	33% 4 9% 27% 23% 3	2400
	21st to end	Day	49% 5% 8% 18% 19% 2	2135
October	1st to 10th	Day	37% 3 8% 21% 27% 5%	3260
	11th to 20th	Day	29% 3 11% 28% 22% 7%	3240
	21st to end	Day	26% 3 12% 28% 28% 3	3514
November	1st to 10th	Day	35% 3 14% 25% 20% 4	1851
	11th to 20th	Day	39% 4 10% 25% 19% 2	1879
	21st to end	Day	42% 5% 11% 30% 10% 2	1680
December	1st to 10th	Day	44% 3 16% 24% 11% 2	2680
	11th to 20th	Day	45% 4 12% 30% 8% 1	3066
	21st to end	Day	47% 4 13% 21% 13% 1	4048
January	1st to 10th	Night	42% 4 12% 24% 14% 3	8234
	11th to 20th	Night	40% 4 11% 21% 18% 6%	7943
	21st to end	Night	40% 3 9% 28% 19% 2	8401
February	1st to 10th	Night	45% 4 13% 25% 12% 2	2730
	11th to 20th	Night	47% 4 9% 20% 18% 2	2572
	21st to end	Night	45% 4 9% 22% 15% 4	2076
March	1st to 10th	Night	44% 4 9% 23% 13% 8%	5311
	11th to 20th	Night	34% 6% 14% 28% 13% 6%	5090
	21st to end	Night	43% 3 8% 18% 25% 4	5362
April	1st to 10th	Night	46% 3 10% 21% 16% 4	2100
	11th to 20th	Night	40% 6% 11% 20% 20% 3	2075
	21st to end	Night	41% 4 10% 23% 17% 5%	2100
May	1st to 10th	Night	51% 4 11% 20% 13% 2	5321
	11th to 20th	Night	48% 4 13% 24% 11% 1	4640
	21st to end	Night	51% 4 8% 21% 13% 2	5115
June	1st to 10th	Night	40% 6% 9% 23% 21% 1	1680
	11th to 20th	Night	39% 7% 14% 25% 15% 2	1680
	21st to end	Night	36% 6% 14% 26% 16% 2	1680
July	1st to 10th	Night	43% 6% 13% 20% 15% 3	4640
	11th to 20th	Night	45% 5% 14% 24% 11% 1	4632
	21st to end	Night	40% 5% 12% 22% 19% 1	5330
August	1st to 10th	Night	47% 5% 17% 20% 10% 1	2994
	11th to 20th	Night	43% 4 11% 26% 15% 1	3184
	21st to end	Night	35% 4 10% 31% 18% 1	3677
September	1st to 10th	Night	38% 5% 10% 23% 20% 4	2000
	11th to 20th	Night	33% 5% 9% 25% 25% 4	2000
	21st to end	Night	46% 5% 8% 19% 20% 3	2259
October	1st to 10th	Night	44% 2 9% 22% 21% 2	3920
	11th to 20th	Night	28% 3 10% 29% 25% 5%	3899
	21st to end	Night	27% 2 11% 33% 25% 3	4274
November	1st to 10th	Night	32% 4 12% 27% 21% 4	2667
	11th to 20th	Night	40% 3 9% 25% 18% 5%	2735
	21st to end	Night	40% 4 12% 28% 15% 1	2940
December	1st to 10th	Night	42% 3 13% 30% 12% 1	4720
	11th to 20th	Night	46% 4 12% 24% 12% 3	5348
	21st to end	Night	48% 4 11% 20% 16% 1	7150

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% 25% 25% 14% 5%	220
	11th to 20th	Day	36% 24% 29% 8% 3	278
	21st to end	Day	28% 29% 28% 12% 2 1	363
February	1st to 10th	Day	28% 24% 33% 13% 3	330
	11th to 20th	Day	34% 21% 36% 8% 1	421
	21st to end	Day	33% 18% 32% 15% 2	446
March	1st to 10th	Day	28% 21% 31% 16% 4	540
	11th to 20th	Day	29% 24% 30% 13% 4 1	540
	21st to end	Day	27% 22% 32% 13% 4 2	594
April	1st to 10th	Day	29% 19% 28% 16% 6% 1	540
	11th to 20th	Day	26% 20% 29% 17% 6% 3	532
	21st to end	Day	26% 15% 32% 19% 6% 2	540
May	1st to 10th	Day	28% 17% 28% 18% 7% 2	543
	11th to 20th	Day	22% 15% 30% 21% 9% 2	567
	21st to end	Day	23% 8% 26% 22% 17% 4	617
June	1st to 10th	Day	17% 12% 28% 24% 16% 3	570
	11th to 20th	Day	21% 10% 27% 26% 14% 3	570
	21st to end	Day	15% 10% 29% 28% 13% 5%	570
July	1st to 10th	Day	13% 5% 21% 31% 23% 8%	565
	11th to 20th	Day	9% 5% 24% 33% 22% 8%	564
	21st to end	Day	12% 4 30% 33% 17% 5%	620
August	1st to 10th	Day	14% 5% 23% 30% 19% 9%	566
	11th to 20th	Day	16% 4 21% 30% 20% 9%	559
	21st to end	Day	12% 5% 24% 33% 16% 10%	619
September	1st to 10th	Day	19% 8% 20% 25% 19% 8%	530
	11th to 20th	Day	13% 4 21% 31% 19% 12%	530
	21st to end	Day	25% 11% 23% 22% 15% 4	530
October	1st to 10th	Day	22% 7% 24% 24% 17% 6%	530
	11th to 20th	Day	19% 16% 29% 20% 13% 3	530
	21st to end	Day	20% 15% 32% 21% 10% 2	575
November	1st to 10th	Day	18% 14% 29% 25% 11% 2	425
	11th to 20th	Day	22% 20% 30% 21% 7%	419
	21st to end	Day	30% 17% 35% 12% 6% 1	220
December	1st to 10th	Day	27% 22% 33% 11% 5% 1	220
	11th to 20th	Day	30% 20% 33% 13% 4	220
	21st to end	Day	31% 18% 26% 17% 7%	242
January	1st to 10th	Night	21% 20% 36% 19% 3	840
	11th to 20th	Night	26% 19% 30% 22% 3	840
	21st to end	Night	18% 21% 37% 22% 2	924
February	1st to 10th	Night	21% 19% 33% 25% 2	840
	11th to 20th	Night	26% 22% 34% 17% 2	823
	21st to end	Night	24% 21% 33% 19% 3	692
March	1st to 10th	Night	23% 18% 33% 21% 5%	840
	11th to 20th	Night	24% 20% 30% 21% 5% 1	840
	21st to end	Night	22% 17% 36% 20% 5%	924
April	1st to 10th	Night	24% 19% 33% 19% 5%	840
	11th to 20th	Night	20% 14% 35% 24% 7%	831
	21st to end	Night	21% 13% 32% 27% 7%	840
May	1st to 10th	Night	25% 10% 30% 28% 8%	659
	11th to 20th	Night	18% 9% 31% 32% 9%	414
	21st to end	Night	19% 5% 25% 36% 14% 2	455
June	1st to 10th	Night	15% 5% 26% 36% 18%	420
	11th to 20th	Night	15% 6% 25% 42% 12%	420
	21st to end	Night	13% 4 24% 44% 15% 1	420
July	1st to 10th	Night	12% 2 19% 42% 23% 2	410
	11th to 20th	Night	10% 2 18% 43% 25% 2	408
	21st to end	Night	11% 3 18% 42% 25% 1	587
August	1st to 10th	Night	14% 2 12% 42% 27% 2	627
	11th to 20th	Night	14% 4 14% 38% 27% 3	738
	21st to end	Night	15% 2 17% 37% 26% 2	917
September	1st to 10th	Night	16% 4 21% 34% 23% 3	800
	11th to 20th	Night	15% 4 17% 35% 26% 4	800
	21st to end	Night	23% 5% 20% 31% 20% 2	800
October	1st to 10th	Night	23% 7% 20% 28% 19% 4	800
	11th to 20th	Night	19% 10% 26% 31% 13% 1	800
	21st to end	Night	21% 12% 28% 29% 10%	880
November	1st to 10th	Night	16% 11% 29% 31% 12% 1	820
	11th to 20th	Night	18% 19% 27% 27% 8% 1	840
	21st to end	Night	18% 18% 32% 25% 7%	840
December	1st to 10th	Night	25% 16% 32% 21% 6%	840
	11th to 20th	Night	21% 16% 33% 25% 5%	840
	21st to end	Night	24% 17% 28% 29% 2	924

Page generated at 2026-08-27 04:07:10. Version ac07

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