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 2024-10-25.

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	16% 7% 2 6% 4 4 4 4 6% 7% 39%	101250
	Night	16% 7% 2 6% 4 4 4 4 5% 7% 40%	97551
Transparency	Day	43% 5% 11% 24% 14% 2	101013
	Night	43% 5% 11% 24% 15% 2	97407
Seeing	Day	21% 13% 28% 22% 12% 4	14881
	Night	20% 12% 28% 28% 11% 1	24203

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% 5% 4 3 5% 6% 41%	2517
	11th to 20th	Day	14% 12% 4 11% 6% 4 4 3 5% 6% 30%	2684
	21st to end	Day	19% 11% 4 9% 5% 5% 3 3 4 5% 32%	3124
February	1st to 10th	Day	15% 9% 3 6% 5% 5% 6% 4 5% 6% 36%	1710
	11th to 20th	Day	15% 8% 3 7% 5% 4 4 3 6% 6% 38%	1744
	21st to end	Day	19% 9% 3 7% 4 4 5% 3 4 5% 35%	1570
March	1st to 10th	Day	25% 6% 2 6% 5% 4 4 3 5% 5% 36%	3234
	11th to 20th	Day	10% 5% 2 7% 5% 6% 5% 4 6% 8% 42%	3480
	21st to end	Day	22% 8% 2 6% 3 3 3 2 4 5% 43%	3965
April	1st to 10th	Day	16% 8% 2 6% 5% 4 5% 4 6% 7% 38%	2280
	11th to 20th	Day	16% 7% 2 5% 4 4 4 4 5% 7% 42%	2254
	21st to end	Day	17% 6% 2 7% 5% 4 4 4 6% 7% 40%	2280
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%	2017
November	1st to 10th	Day	14% 7% 2 5% 3 2 3 3 5% 7% 49%	1671
	11th to 20th	Day	17% 5% 1 5% 5% 3 4 3 5% 7% 44%	1701
	21st to end	Day	16% 6% 2 6% 4 4 5% 3 5% 8% 42%	1520
December	1st to 10th	Day	19% 9% 2 7% 5% 4 4 3 6% 6% 34%	1520
	11th to 20th	Day	20% 7% 2 5% 4 4 4 3 5% 7% 38%	1906
	21st to end	Day	18% 8% 3 8% 5% 5% 5% 3 6% 7% 31%	2772
January	1st to 10th	Night	15% 7% 2 7% 4 4 4 4 5% 8% 39%	4429
	11th to 20th	Night	18% 8% 3 6% 4 4 4 3 5% 6% 38%	4271
	21st to end	Night	22% 10% 3 8% 4 3 3 3 4 6% 35%	4532
February	1st to 10th	Night	16% 8% 3 6% 5% 4 5% 4 5% 7% 38%	2470
	11th to 20th	Night	17% 8% 3 7% 4 4 5% 3 4 6% 39%	2320
	21st to end	Night	18% 7% 3 6% 4 4 4 3 5% 6% 38%	1884
March	1st to 10th	Night	21% 10% 3 7% 4 3 3 3 4 5% 37%	3601
	11th to 20th	Night	11% 7% 2 6% 5% 4 4 4 5% 6% 47%	3479
	21st to end	Night	15% 9% 3 5% 4 3 3 3 4 5% 46%	3666
April	1st to 10th	Night	17% 7% 3 5% 6% 4 4 4 6% 7% 38%	1900
	11th to 20th	Night	15% 7% 2 6% 4 4 4 3 5% 8% 42%	1875
	21st to end	Night	18% 6% 2 5% 4 3 3 4 5% 6% 44%	1900
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	19% 5% 1 5% 3 3 2 3 5% 7% 46%	2443
November	1st to 10th	Night	12% 5% 1 4 4 3 4 3 5% 6% 52%	2407
	11th to 20th	Night	15% 7% 3 6% 4 3 4 3 5% 6% 45%	2474
	21st to end	Night	15% 5% 2 5% 4 4 4 4 5% 8% 43%	2660
December	1st to 10th	Night	19% 8% 2 7% 4 5% 4 3 5% 6% 36%	2660
	11th to 20th	Night	17% 7% 2 6% 4 4 4 4 5% 7% 39%	3288
	21st to end	Night	18% 8% 3 6% 5% 4 5% 4 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 9% 22% 11% 4	1570
March	1st to 10th	Day	48% 6% 8% 27% 9% 2	3237
	11th to 20th	Day	37% 6% 11% 28% 15% 3	3480
	21st to end	Day	46% 3 9% 21% 19% 3	3965
April	1st to 10th	Day	44% 4 10% 22% 15% 5%	2280
	11th to 20th	Day	41% 6% 11% 23% 16% 4	2254
	21st to end	Day	42% 5% 11% 22% 16% 4	2280
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	41% 4 11% 25% 18% 2	1900
	11th to 20th	Day	40% 4 10% 25% 19% 2	1900
	21st to end	Day	40% 5% 10% 25% 19% 2	2017
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 10% 21% 15% 4	1884
March	1st to 10th	Night	49% 4 9% 24% 13% 2	3611
	11th to 20th	Night	34% 7% 12% 29% 16% 2	3480
	21st to end	Night	41% 4 7% 20% 23% 5%	3666
April	1st to 10th	Night	45% 4 10% 22% 16% 4	1900
	11th to 20th	Night	40% 6% 10% 21% 20% 3	1875
	21st to end	Night	41% 5% 10% 23% 17% 5%	1900
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	44% 3 10% 25% 16% 2	2280
	11th to 20th	Night	36% 4 10% 29% 18% 3	2280
	21st to end	Night	38% 3 9% 28% 19% 2	2443
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	36% 16% 30% 16% 2	382
March	1st to 10th	Day	26% 22% 31% 17% 4	460
	11th to 20th	Day	27% 26% 30% 13% 4 1	460
	21st to end	Day	27% 21% 32% 14% 5% 2	506
April	1st to 10th	Day	28% 20% 28% 17% 7% 1	460
	11th to 20th	Day	25% 19% 29% 17% 7% 3	452
	21st to end	Day	28% 14% 32% 19% 5% 3	460
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	21% 14% 32% 21% 10% 2	508
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% 21% 32% 19% 3	628
March	1st to 10th	Night	21% 18% 34% 22% 4	760
	11th to 20th	Night	24% 20% 30% 20% 5% 1	760
	21st to end	Night	22% 17% 35% 20% 6%	836
April	1st to 10th	Night	23% 19% 34% 20% 5%	760
	11th to 20th	Night	20% 14% 34% 25% 7%	751
	21st to end	Night	21% 13% 31% 26% 8%	760
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	23% 11% 27% 27% 11%	812
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

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