McGee Creek Natural Scenic State Recreation Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the McGee Creek Natural Scenic State Recreation Area clear sky chart from 2005-11-06 to 2026-01-02.

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	13% 6% 2 5% 4 4 4 3 5% 7% 49%	127424
	Night	13% 5% 2 4 3 3 3 3 4 6% 54%	124200
Transparency	Day	35% 3 10% 25% 21% 6%	131076
	Night	32% 3 9% 24% 24% 9%	128611
Seeing	Day	17% 12% 28% 26% 15% 3	16838
	Night	16% 12% 29% 30% 12% 1	26733

By Month

Percentage Cloud Cover SE (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% 9% 3 5% 3 3 3 2 4 5% 48%	4086
	11th to 20th	Day	6% 5% 2 4 3 3 3 2 4 5% 62%	4080
	21st to end	Day	20% 8% 2 5% 2 2 2 2 3 5% 49%	4488
February	1st to 10th	Day	21% 7% 3 7% 4 3 4 2 3 4 41%	1800
	11th to 20th	Day	18% 8% 3 6% 4 4 3 3 4 5% 44%	1934
	21st to end	Day	22% 7% 3 5% 3 3 3 2 3 4 46%	1721
March	1st to 10th	Day	20% 6% 2 5% 3 2 3 2 4 4 48%	4936
	11th to 20th	Day	12% 6% 2 5% 3 3 3 3 5% 6% 51%	4980
	21st to end	Day	17% 8% 3 6% 4 4 4 3 5% 6% 40%	5462
April	1st to 10th	Day	17% 7% 2 6% 4 3 3 3 4 6% 45%	2200
	11th to 20th	Day	17% 5% 2 5% 5% 3 4 3 5% 5% 46%	2366
	21st to end	Day	19% 8% 2 7% 4 4 3 3 4 5% 41%	2490
May	1st to 10th	Day	20% 7% 2 6% 4 4 4 3 5% 6% 39%	5862
	11th to 20th	Day	15% 6% 2 6% 4 4 4 3 5% 6% 43%	5862
	21st to end	Day	18% 7% 2 7% 5% 4 4 3 5% 6% 37%	6434
June	1st to 10th	Day	10% 5% 2 5% 3 4 5% 5% 7% 10% 44%	2600
	11th to 20th	Day	10% 5% 2 6% 4 5% 5% 5% 7% 9% 44%	2600
	21st to end	Day	5% 3 1 4 4 5% 5% 4 6% 9% 54%	2600
July	1st to 10th	Day	7% 5% 3 7% 5% 5% 6% 5% 6% 10% 40%	5900
	11th to 20th	Day	5% 3 2 4 4 4 4 4 6% 8% 57%	5900
	21st to end	Day	5% 4 1 5% 4 4 5% 5% 7% 9% 51%	6422
August	1st to 10th	Day	4 2 1 4 3 3 4 3 6% 8% 61%	4234
	11th to 20th	Day	7% 3 1 4 3 3 3 3 6% 10% 55%	4171
	21st to end	Day	4 3 1 4 5% 4 5% 4 7% 9% 55%	4363
September	1st to 10th	Day	11% 5% 1 4 4 4 4 3 5% 6% 52%	2224
	11th to 20th	Day	9% 5% 2 5% 5% 5% 6% 5% 5% 7% 48%	2200
	21st to end	Day	9% 4 1 4 3 4 4 3 5% 6% 57%	2200
October	1st to 10th	Day	8% 4 2 4 3 4 4 3 4 5% 60%	2074
	11th to 20th	Day	13% 4 2 4 2 3 2 2 3 4 61%	2000
	21st to end	Day	19% 6% 2 4 2 2 3 2 3 4 53%	2200
November	1st to 10th	Day	13% 5% 1 5% 3 2 3 3 4 5% 55%	2058
	11th to 20th	Day	12% 4 2 4 3 3 2 2 4 5% 59%	1989
	21st to end	Day	18% 5% 1 5% 3 3 3 2 3 5% 52%	1890
December	1st to 10th	Day	19% 6% 2 3 2 2 3 2 4 5% 52%	3030
	11th to 20th	Day	23% 7% 2 4 2 3 3 2 4 5% 46%	3481
	21st to end	Day	24% 8% 2 5% 3 3 3 2 4 5% 42%	4587
January	1st to 10th	Night	15% 5% 2 7% 3 3 3 3 4 5% 49%	5902
	11th to 20th	Night	7% 4 2 3 2 2 3 2 4 5% 65%	5900
	21st to end	Night	22% 8% 2 4 2 2 3 2 3 4 47%	6490
February	1st to 10th	Night	17% 7% 3 5% 4 3 3 3 4 5% 47%	2600
	11th to 20th	Night	17% 8% 2 6% 3 4 3 3 5% 5% 45%	2368
	21st to end	Night	17% 7% 2 4 3 3 3 3 3 5% 51%	1906
March	1st to 10th	Night	20% 7% 2 5% 2 3 3 3 4 4 46%	4919
	11th to 20th	Night	11% 5% 1 4 3 3 3 3 4 6% 57%	4980
	21st to end	Night	17% 6% 2 5% 3 3 3 3 5% 6% 46%	5467
April	1st to 10th	Night	16% 6% 2 5% 3 3 3 3 5% 5% 50%	2200
	11th to 20th	Night	14% 5% 2 5% 3 3 4 2 5% 7% 50%	1981
	21st to end	Night	16% 5% 2 5% 4 3 2 3 4 7% 48%	1905
May	1st to 10th	Night	21% 7% 2 5% 4 3 3 3 5% 6% 41%	4053
	11th to 20th	Night	13% 4 2 5% 4 4 4 4 6% 8% 47%	4053
	21st to end	Night	15% 5% 2 6% 3 4 4 4 5% 8% 44%	4443
June	1st to 10th	Night	6% 3 2 4 3 3 3 4 7% 9% 57%	1800
	11th to 20th	Night	7% 3 1 4 3 2 3 3 6% 10% 57%	1800
	21st to end	Night	4 2 1 3 2 2 3 3 5% 8% 66%	1800
July	1st to 10th	Night	6% 5% 2 6% 4 4 5% 5% 7% 10% 46%	4078
	11th to 20th	Night	4 2 1 3 3 3 3 3 5% 8% 66%	4077
	21st to end	Night	3 3 1 3 3 2 4 3 6% 10% 61%	4449
August	1st to 10th	Night	2 2 1 2 2 3 4 2 5% 8% 68%	2926
	11th to 20th	Night	4 3 1 3 2 2 4 3 5% 9% 64%	2888
	21st to end	Night	3 2 1 4 3 4 3 3 6% 9% 62%	3522
September	1st to 10th	Night	7% 5% 1 4 3 3 3 3 5% 7% 59%	2171
	11th to 20th	Night	8% 4 2 5% 4 4 4 3 6% 7% 53%	2200
	21st to end	Night	8% 2 2 4 2 3 3 3 4 8% 61%	2200
October	1st to 10th	Night	7% 3 1 4 3 3 3 3 4 6% 64%	2305
	11th to 20th	Night	11% 4 2 3 2 3 3 2 3 5% 62%	2400
	21st to end	Night	18% 5% 2 4 3 2 2 2 3 4 56%	2640
November	1st to 10th	Night	13% 4 2 3 3 3 3 3 4 4 58%	2460
	11th to 20th	Night	10% 5% 2 4 3 3 3 3 4 5% 59%	2628
	21st to end	Night	18% 5% 2 3 3 2 3 2 4 5% 53%	2730
December	1st to 10th	Night	12% 7% 2 5% 3 3 3 3 4 5% 54%	4380
	11th to 20th	Night	19% 6% 2 5% 3 2 3 2 3 4 51%	4946
	21st to end	Night	21% 10% 2 4 2 2 2 2 3 4 48%	6633

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	41% 1 9% 26% 20% 3	4087
	11th to 20th	Day	26% 2 9% 25% 34% 4	4080
	21st to end	Day	42% 1 4 20% 25% 9%	4488
February	1st to 10th	Day	47% 2 7% 17% 21% 5%	1800
	11th to 20th	Day	44% 2 6% 23% 20% 5%	1944
	21st to end	Day	45% 2 4 15% 25% 10%	1721
March	1st to 10th	Day	41% 1 5% 16% 20% 18%	4936
	11th to 20th	Day	36% 1 7% 18% 18% 19%	4980
	21st to end	Day	46% 2 9% 25% 17% 1	5464
April	1st to 10th	Day	42% 3 9% 21% 18% 8%	2200
	11th to 20th	Day	40% 3 9% 22% 20% 6%	2366
	21st to end	Day	46% 3 8% 21% 19% 3	2490
May	1st to 10th	Day	47% 3 9% 23% 15% 2	5900
	11th to 20th	Day	42% 3 12% 22% 18% 3	5866
	21st to end	Day	48% 4 11% 19% 14% 4	6447
June	1st to 10th	Day	34% 5% 15% 28% 15% 2	2600
	11th to 20th	Day	35% 4 14% 26% 18% 2	2600
	21st to end	Day	26% 7% 13% 29% 23% 3	2600
July	1st to 10th	Day	37% 7% 18% 27% 11% 1	5836
	11th to 20th	Day	23% 5% 12% 37% 21% 2	5831
	21st to end	Day	25% 7% 15% 34% 18% 1	6240
August	1st to 10th	Day	20% 4 13% 28% 28% 6%	4220
	11th to 20th	Day	25% 4 18% 36% 15% 2	4210
	21st to end	Day	24% 7% 16% 37% 14% 2	4362
September	1st to 10th	Day	32% 4 8% 25% 21% 9%	2224
	11th to 20th	Day	33% 5% 10% 24% 21% 8%	2200
	21st to end	Day	27% 5% 8% 23% 28% 10%	2200
October	1st to 10th	Day	18% 2 6% 12% 38% 24%	3373
	11th to 20th	Day	20% 2 4 19% 35% 20%	3240
	21st to end	Day	30% 2 5% 28% 27% 7%	3538
November	1st to 10th	Day	33% 2 8% 25% 25% 7%	2058
	11th to 20th	Day	30% 2 7% 26% 27% 10%	1989
	21st to end	Day	37% 1 6% 22% 26% 7%	1890
December	1st to 10th	Day	37% 2 7% 34% 18% 3	3030
	11th to 20th	Day	44% 1 4 20% 25% 6%	3479
	21st to end	Day	47% 1 5% 23% 21% 4	4587
January	1st to 10th	Night	39% 1 6% 27% 23% 3	5902
	11th to 20th	Night	23% 2 10% 22% 33% 10%	5900
	21st to end	Night	44% 1 5% 15% 26% 9%	6490
February	1st to 10th	Night	41% 3 7% 20% 22% 7%	2600
	11th to 20th	Night	42% 3 6% 22% 21% 6%	2368
	21st to end	Night	39% 2 5% 19% 23% 13%	1906
March	1st to 10th	Night	43% 1 4 15% 21% 16%	4919
	11th to 20th	Night	31% 1 5% 23% 17% 23%	4980
	21st to end	Night	40% 2 9% 20% 25% 3	5467
April	1st to 10th	Night	38% 2 8% 21% 19% 12%	2200
	11th to 20th	Night	35% 3 8% 23% 20% 11%	1981
	21st to end	Night	38% 2 10% 25% 22% 3	1905
May	1st to 10th	Night	46% 3 11% 22% 13% 5%	4080
	11th to 20th	Night	35% 3 12% 24% 20% 5%	4054
	21st to end	Night	40% 3 15% 21% 15% 6%	4452
June	1st to 10th	Night	25% 4 15% 33% 19% 3	1800
	11th to 20th	Night	23% 4 13% 33% 24% 4	1800
	21st to end	Night	18% 5% 14% 30% 29% 5%	1800
July	1st to 10th	Night	33% 6% 18% 28% 13% 3	4035
	11th to 20th	Night	18% 4 13% 37% 26% 3	4026
	21st to end	Night	19% 5% 17% 36% 22% 1	4320
August	1st to 10th	Night	15% 3 10% 31% 33% 8%	2916
	11th to 20th	Night	18% 3 16% 37% 21% 5%	2915
	21st to end	Night	20% 4 16% 37% 20% 3	3522
September	1st to 10th	Night	26% 4 10% 24% 26% 11%	2171
	11th to 20th	Night	30% 4 9% 24% 22% 10%	2200
	21st to end	Night	24% 3 7% 25% 29% 12%	2200
October	1st to 10th	Night	15% 2 5% 14% 35% 30%	3773
	11th to 20th	Night	18% 1 4 15% 41% 21%	3899
	21st to end	Night	30% 3 5% 28% 24% 11%	4252
November	1st to 10th	Night	30% 3 6% 23% 28% 11%	2460
	11th to 20th	Night	29% 2 6% 23% 28% 12%	2628
	21st to end	Night	35% 3 6% 21% 28% 7%	2730
December	1st to 10th	Night	33% 3 7% 28% 24% 5%	4380
	11th to 20th	Night	41% 2 4 18% 26% 10%	4947
	21st to end	Night	43% 2 6% 22% 22% 5%	6633

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	24% 25% 33% 15% 3	303
	11th to 20th	Day	24% 25% 37% 10% 2 1	300
	21st to end	Day	25% 25% 31% 14% 4	330
February	1st to 10th	Day	35% 18% 36% 10% 2	300
	11th to 20th	Day	35% 27% 31% 6% 1	300
	21st to end	Day	39% 24% 27% 8% 2	249
March	1st to 10th	Day	31% 22% 33% 13% 2	300
	11th to 20th	Day	35% 27% 28% 7% 3	300
	21st to end	Day	28% 26% 36% 7% 2	330
April	1st to 10th	Day	31% 21% 36% 9% 2	300
	11th to 20th	Day	29% 20% 35% 12% 4	484
	21st to end	Day	24% 23% 33% 14% 5% 1	590
May	1st to 10th	Day	19% 17% 41% 19% 3	703
	11th to 20th	Day	18% 13% 39% 20% 10% 2	725
	21st to end	Day	17% 10% 37% 20% 14% 2	789
June	1st to 10th	Day	10% 6% 27% 35% 18% 4	730
	11th to 20th	Day	10% 6% 28% 37% 16% 3	730
	21st to end	Day	5% 3 25% 40% 22% 4	730
July	1st to 10th	Day	8% 2 19% 36% 28% 7%	721
	11th to 20th	Day	3 2 17% 40% 32% 5%	718
	21st to end	Day	4 2 16% 40% 31% 8%	794
August	1st to 10th	Day	5% 1 14% 47% 29% 4	726
	11th to 20th	Day	9% 3 16% 42% 28% 4	715
	21st to end	Day	7% 2 13% 37% 34% 8%	621
September	1st to 10th	Day	9% 2 14% 35% 32% 8%	354
	11th to 20th	Day	5% 3 21% 41% 26% 4	330
	21st to end	Day	13% 6% 21% 38% 18% 3	330
October	1st to 10th	Day	6% 8% 32% 38% 13% 3	330
	11th to 20th	Day	17% 12% 36% 29% 6%	330
	21st to end	Day	29% 15% 29% 22% 5%	363
November	1st to 10th	Day	17% 15% 41% 21% 5% 2	330
	11th to 20th	Day	18% 19% 36% 21% 4 2	330
	21st to end	Day	26% 22% 35% 14% 3	330
December	1st to 10th	Day	27% 17% 35% 16% 5%	330
	11th to 20th	Day	31% 19% 36% 10% 4	330
	21st to end	Day	28% 21% 33% 14% 3	363
January	1st to 10th	Night	18% 17% 33% 26% 5%	1006
	11th to 20th	Night	22% 18% 32% 24% 4	1000
	21st to end	Night	19% 18% 32% 26% 5%	1100
February	1st to 10th	Night	24% 21% 33% 19% 3	1000
	11th to 20th	Night	25% 21% 33% 18% 2	814
	21st to end	Night	26% 19% 33% 19% 3	586
March	1st to 10th	Night	24% 16% 34% 22% 4	600
	11th to 20th	Night	23% 17% 38% 19% 4	600
	21st to end	Night	20% 19% 35% 20% 5%	660
April	1st to 10th	Night	20% 19% 37% 21% 4	600
	11th to 20th	Night	19% 18% 35% 23% 5%	593
	21st to end	Night	17% 17% 37% 22% 7% 1	600
May	1st to 10th	Night	13% 13% 37% 30% 7%	600
	11th to 20th	Night	13% 8% 38% 28% 12% 1	591
	21st to end	Night	10% 8% 33% 31% 16% 2	650
June	1st to 10th	Night	7% 5% 23% 41% 22% 3	600
	11th to 20th	Night	7% 4 31% 42% 16%	600
	21st to end	Night	3 2 22% 45% 25% 4	600
July	1st to 10th	Night	6% 1 16% 41% 32% 4	585
	11th to 20th	Night	3 1 18% 47% 28% 3	582
	21st to end	Night	4 1 13% 44% 33% 5%	657
August	1st to 10th	Night	4 1 14% 49% 30% 3	597
	11th to 20th	Night	6% 1 14% 44% 30% 4	594
	21st to end	Night	5% 1 13% 45% 33% 4	660
September	1st to 10th	Night	9% 3 13% 44% 29% 3	600
	11th to 20th	Night	10% 3 18% 38% 29% 3	600
	21st to end	Night	7% 3 24% 39% 25% 3	600
October	1st to 10th	Night	8% 6% 29% 35% 20% 2	705
	11th to 20th	Night	14% 9% 32% 32% 12% 1	800
	21st to end	Night	21% 13% 28% 25% 11% 1	880
November	1st to 10th	Night	15% 12% 36% 29% 8%	820
	11th to 20th	Night	15% 15% 33% 29% 8%	948
	21st to end	Night	24% 15% 31% 23% 8%	1050
December	1st to 10th	Night	19% 16% 35% 26% 4	1050
	11th to 20th	Night	24% 14% 34% 23% 5%	1050
	21st to end	Night	24% 18% 31% 23% 4	1155

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