Kearn Memorial Wildlife Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kearn Memorial Wildlife Area clear sky chart from 2005-11-06 to 2026-01-17.

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	12% 7% 3 6% 4 4 4 3 5% 7% 44%	127212
	Night	12% 7% 3 7% 4 4 4 3 5% 6% 47%	124728
Transparency	Day	38% 5% 12% 26% 17% 3	130822
	Night	37% 5% 11% 25% 18% 4	129194
Seeing	Day	15% 10% 27% 28% 16% 4	17244
	Night	14% 9% 32% 31% 13% 1	27154

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	16% 10% 3 8% 5% 4 5% 3 5% 5% 36%	4144
	11th to 20th	Day	8% 10% 4 8% 5% 6% 5% 3 4 5% 40%	4134
	21st to end	Day	14% 13% 3 7% 3 4 4 3 4 5% 40%	4488
February	1st to 10th	Day	15% 12% 5% 8% 5% 4 3 3 4 6% 35%	1800
	11th to 20th	Day	15% 9% 4 8% 5% 3 3 4 4 5% 40%	1754
	21st to end	Day	14% 9% 3 6% 4 3 4 4 5% 6% 41%	1698
March	1st to 10th	Day	13% 10% 3 5% 3 2 3 2 3 5% 51%	4936
	11th to 20th	Day	10% 6% 2 5% 3 3 3 3 5% 7% 53%	4980
	21st to end	Day	15% 11% 3 7% 5% 4 4 4 5% 7% 34%	5462
April	1st to 10th	Day	14% 8% 3 7% 5% 4 3 3 5% 6% 43%	2368
	11th to 20th	Day	16% 9% 2 5% 4 4 3 3 6% 6% 41%	2374
	21st to end	Day	19% 8% 3 8% 5% 5% 4 3 5% 6% 34%	2432
May	1st to 10th	Day	15% 7% 2 6% 5% 4 5% 3 6% 8% 38%	5862
	11th to 20th	Day	14% 6% 2 6% 4 4 4 4 6% 8% 42%	5862
	21st to end	Day	19% 6% 2 5% 4 4 4 3 5% 7% 41%	6881
June	1st to 10th	Day	8% 4 2 5% 5% 4 4 4 7% 10% 47%	2800
	11th to 20th	Day	8% 5% 2 6% 5% 5% 5% 4 6% 9% 47%	2800
	21st to end	Day	6% 3 2 5% 5% 4 4 4 6% 10% 51%	2800
July	1st to 10th	Day	10% 6% 2 6% 3 4 4 3 5% 8% 47%	6186
	11th to 20th	Day	7% 5% 2 6% 4 5% 5% 4 7% 10% 44%	5900
	21st to end	Day	7% 4 2 6% 4 5% 6% 5% 9% 11% 41%	6422
August	1st to 10th	Day	5% 3 1 5% 4 4 4 4 6% 10% 53%	4234
	11th to 20th	Day	10% 6% 2 6% 4 4 4 4 5% 8% 48%	4143
	21st to end	Day	5% 3 2 5% 3 4 4 4 6% 10% 55%	4312
September	1st to 10th	Day	11% 5% 2 5% 3 4 3 3 5% 7% 52%	2400
	11th to 20th	Day	10% 4 2 5% 3 4 4 4 6% 7% 51%	2320
	21st to end	Day	8% 6% 2 5% 3 4 4 3 4 6% 55%	2129
October	1st to 10th	Day	12% 4 2 5% 3 3 3 3 5% 7% 55%	2000
	11th to 20th	Day	13% 6% 3 6% 2 3 2 2 3 5% 55%	2000
	21st to end	Day	17% 8% 3 7% 3 3 2 2 4 5% 46%	2200
November	1st to 10th	Day	11% 5% 2 5% 3 2 4 3 4 6% 54%	2058
	11th to 20th	Day	14% 6% 2 6% 4 3 3 3 4 6% 50%	1805
	21st to end	Day	16% 9% 3 7% 3 3 2 3 4 5% 44%	1680
December	1st to 10th	Day	7% 7% 3 7% 4 3 3 3 4 6% 52%	2690
	11th to 20th	Day	10% 8% 3 7% 4 4 3 3 4 5% 48%	3088
	21st to end	Day	18% 20% 7% 10% 4 3 3 3 3 4 24%	4070
January	1st to 10th	Night	14% 9% 4 15% 6% 5% 3 3 3 3 35%	6037
	11th to 20th	Night	11% 8% 4 12% 5% 6% 4 3 3 3 41%	5979
	21st to end	Night	15% 11% 4 9% 3 3 4 3 4 5% 41%	6490
February	1st to 10th	Night	14% 10% 4 7% 5% 4 5% 3 6% 6% 37%	2600
	11th to 20th	Night	14% 9% 3 8% 4 4 3 3 4 6% 42%	2533
	21st to end	Night	13% 9% 4 7% 3 3 4 4 4 5% 46%	1945
March	1st to 10th	Night	15% 10% 3 5% 4 3 3 3 4 5% 45%	4919
	11th to 20th	Night	10% 7% 2 5% 3 3 3 3 5% 7% 54%	4980
	21st to end	Night	14% 9% 4 8% 5% 5% 4 3 5% 7% 37%	5467
April	1st to 10th	Night	10% 7% 2 6% 3 4 4 3 5% 6% 50%	2031
	11th to 20th	Night	15% 7% 3 5% 3 2 3 3 4 7% 47%	1975
	21st to end	Night	18% 7% 2 6% 4 3 4 3 5% 8% 40%	1965
May	1st to 10th	Night	16% 8% 2 6% 4 3 4 3 5% 8% 42%	4053
	11th to 20th	Night	14% 7% 3 6% 3 3 4 3 6% 9% 44%	4053
	21st to end	Night	16% 6% 1 5% 4 3 3 3 5% 6% 47%	3993
June	1st to 10th	Night	7% 3 1 4 4 3 4 5% 7% 8% 54%	1600
	11th to 20th	Night	5% 3 1 5% 5% 4 4 3 7% 12% 51%	1600
	21st to end	Night	4 2 1 3 3 4 5% 3 7% 10% 58%	1600
July	1st to 10th	Night	9% 6% 2 5% 3 4 4 3 7% 9% 48%	3773
	11th to 20th	Night	5% 4 2 6% 4 4 4 4 7% 10% 51%	4077
	21st to end	Night	6% 4 2 4 4 5% 4 4 8% 12% 46%	4449
August	1st to 10th	Night	3 1 1 3 3 4 3 3 6% 9% 63%	2926
	11th to 20th	Night	10% 5% 2 5% 4 3 3 3 4 7% 53%	2915
	21st to end	Night	3 3 1 4 4 4 4 4 6% 8% 59%	3586
September	1st to 10th	Night	11% 5% 2 4 3 3 2 3 5% 7% 57%	2000
	11th to 20th	Night	9% 4 1 4 3 4 3 4 5% 8% 54%	2075
	21st to end	Night	8% 4 1 4 4 3 4 3 4 6% 58%	2250
October	1st to 10th	Night	8% 4 2 4 3 3 4 3 5% 6% 60%	2400
	11th to 20th	Night	13% 4 2 5% 3 3 3 2 4 5% 55%	2400
	21st to end	Night	16% 6% 2 5% 3 3 3 2 4 4 51%	2640
November	1st to 10th	Night	11% 5% 1 3 3 3 4 2 4 5% 57%	2460
	11th to 20th	Night	10% 7% 2 5% 4 3 3 3 5% 6% 52%	2808
	21st to end	Night	16% 9% 2 6% 4 3 3 2 3 5% 47%	2940
December	1st to 10th	Night	8% 8% 2 5% 4 4 3 3 5% 6% 52%	4720
	11th to 20th	Night	13% 9% 3 7% 4 3 3 3 4 5% 45%	5339
	21st to end	Night	20% 17% 5% 10% 4 4 3 2 3 4 28%	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	51% 4 10% 23% 11% 1	4145
	11th to 20th	Day	46% 4 9% 23% 14% 4	4134
	21st to end	Day	48% 3 9% 17% 18% 4	4488
February	1st to 10th	Day	51% 4 11% 21% 11% 1	1800
	11th to 20th	Day	47% 5% 11% 20% 15% 2	1763
	21st to end	Day	44% 5% 9% 23% 16% 4	1698
March	1st to 10th	Day	39% 3 7% 24% 22% 5%	4936
	11th to 20th	Day	32% 4 9% 23% 26% 7%	4980
	21st to end	Day	48% 6% 17% 24% 5%	5464
April	1st to 10th	Day	43% 5% 10% 23% 16% 2	2368
	11th to 20th	Day	43% 6% 13% 23% 14% 2	2374
	21st to end	Day	50% 5% 12% 21% 11% 1	2432
May	1st to 10th	Day	44% 7% 13% 23% 13% 1	5900
	11th to 20th	Day	39% 8% 13% 24% 14% 3	5866
	21st to end	Day	43% 7% 9% 28% 13% 1	6895
June	1st to 10th	Day	30% 9% 16% 28% 16% 1	2800
	11th to 20th	Day	33% 8% 14% 28% 16% 2	2800
	21st to end	Day	27% 7% 16% 30% 15% 4	2800
July	1st to 10th	Day	35% 6% 11% 26% 20% 2	6120
	11th to 20th	Day	33% 7% 15% 30% 13% 1	5831
	21st to end	Day	31% 9% 18% 32% 9%	6240
August	1st to 10th	Day	26% 6% 17% 29% 20% 1	4220
	11th to 20th	Day	35% 6% 14% 28% 15% 1	4182
	21st to end	Day	24% 6% 15% 37% 14% 4	4311
September	1st to 10th	Day	32% 6% 13% 25% 18% 6%	2400
	11th to 20th	Day	31% 6% 9% 27% 24% 2	2320
	21st to end	Day	30% 5% 10% 28% 23% 4	2129
October	1st to 10th	Day	19% 3 6% 20% 38% 14%	3260
	11th to 20th	Day	22% 2 5% 24% 39% 8%	3240
	21st to end	Day	37% 3 7% 24% 25% 3	3538
November	1st to 10th	Day	32% 5% 12% 28% 20% 4	2058
	11th to 20th	Day	37% 4 9% 24% 22% 4	1805
	21st to end	Day	44% 3 9% 28% 16% 1	1680
December	1st to 10th	Day	35% 3 12% 34% 15% 1	2690
	11th to 20th	Day	40% 4 11% 30% 14% 1	3085
	21st to end	Day	65% 3 11% 14% 6% 1	4070
January	1st to 10th	Night	55% 3 10% 21% 10% 1	6037
	11th to 20th	Night	49% 3 9% 22% 13% 4	5979
	21st to end	Night	47% 3 11% 18% 17% 5%	6490
February	1st to 10th	Night	48% 5% 12% 20% 13% 2	2600
	11th to 20th	Night	44% 4 11% 21% 17% 3	2534
	21st to end	Night	42% 4 9% 22% 18% 5%	1945
March	1st to 10th	Night	42% 4 7% 20% 22% 4	4919
	11th to 20th	Night	31% 4 6% 24% 28% 6%	4980
	21st to end	Night	46% 5% 14% 24% 9% 2	5467
April	1st to 10th	Night	35% 5% 11% 23% 22% 4	2031
	11th to 20th	Night	38% 4 9% 26% 18% 5%	1975
	21st to end	Night	44% 5% 11% 25% 14% 1	1965
May	1st to 10th	Night	42% 7% 15% 21% 14% 1	4080
	11th to 20th	Night	36% 7% 12% 22% 17% 5%	4054
	21st to end	Night	38% 6% 10% 23% 21% 1	4001
June	1st to 10th	Night	25% 7% 16% 33% 16% 4	1600
	11th to 20th	Night	25% 9% 14% 28% 21% 3	1600
	21st to end	Night	20% 6% 18% 30% 21% 5%	1600
July	1st to 10th	Night	31% 5% 13% 27% 22% 2	3732
	11th to 20th	Night	27% 6% 15% 35% 16% 2	4026
	21st to end	Night	27% 6% 18% 38% 10% 1	4320
August	1st to 10th	Night	17% 5% 22% 31% 23% 2	2916
	11th to 20th	Night	33% 4 12% 29% 21% 1	2942
	21st to end	Night	23% 6% 13% 37% 18% 4	3586
September	1st to 10th	Night	29% 4 11% 27% 22% 7%	2000
	11th to 20th	Night	29% 6% 11% 27% 23% 5%	2075
	21st to end	Night	27% 5% 9% 27% 28% 4	2250
October	1st to 10th	Night	16% 3 5% 22% 41% 11%	3920
	11th to 20th	Night	23% 3 7% 23% 28% 16%	3899
	21st to end	Night	33% 4 7% 28% 24% 3	4252
November	1st to 10th	Night	29% 4 11% 29% 21% 5%	2460
	11th to 20th	Night	34% 4 9% 26% 23% 5%	2808
	21st to end	Night	42% 3 9% 27% 16% 3	2940
December	1st to 10th	Night	34% 4 11% 35% 15% 1	4720
	11th to 20th	Night	42% 3 11% 26% 16% 1	5341
	21st to end	Night	62% 4 10% 17% 6% 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	20% 16% 38% 22% 4	330
	11th to 20th	Day	26% 15% 41% 16% 1	318
	21st to end	Day	15% 18% 46% 18% 3	330
February	1st to 10th	Day	28% 15% 39% 16% 2	300
	11th to 20th	Day	21% 25% 36% 14% 4 1	300
	21st to end	Day	22% 22% 39% 13% 3	249
March	1st to 10th	Day	18% 19% 43% 18% 2	300
	11th to 20th	Day	28% 16% 32% 19% 3 1	300
	21st to end	Day	32% 21% 30% 12% 5%	330
April	1st to 10th	Day	20% 18% 33% 22% 6% 1	468
	11th to 20th	Day	22% 16% 34% 21% 6%	492
	21st to end	Day	23% 13% 31% 24% 8%	532
May	1st to 10th	Day	16% 13% 36% 24% 10% 1	703
	11th to 20th	Day	17% 12% 28% 27% 13% 3	725
	21st to end	Day	17% 8% 28% 26% 16% 5%	789
June	1st to 10th	Day	8% 4 20% 35% 25% 8%	730
	11th to 20th	Day	9% 3 24% 36% 23% 5%	730
	21st to end	Day	5% 6% 29% 37% 19% 3	730
July	1st to 10th	Day	11% 3 14% 31% 30% 12%	721
	11th to 20th	Day	5% 2 19% 36% 29% 8%	718
	21st to end	Day	9% 2 15% 34% 32% 9%	794
August	1st to 10th	Day	8% 3 16% 42% 28% 5%	726
	11th to 20th	Day	8% 4 19% 34% 30% 7%	700
	21st to end	Day	9% 2 11% 33% 34% 11%	583
September	1st to 10th	Day	11% 4 15% 35% 28% 8%	530
	11th to 20th	Day	7% 3 15% 40% 27% 9%	450
	21st to end	Day	12% 5% 23% 31% 20% 8%	330
October	1st to 10th	Day	15% 6% 28% 28% 17% 6%	330
	11th to 20th	Day	14% 15% 38% 23% 11%	330
	21st to end	Day	25% 18% 31% 22% 4 1	363
November	1st to 10th	Day	15% 12% 38% 25% 7% 3	330
	11th to 20th	Day	15% 20% 31% 24% 8% 2	330
	21st to end	Day	26% 15% 27% 25% 6%	330
December	1st to 10th	Day	15% 16% 41% 19% 7% 1	330
	11th to 20th	Day	20% 17% 38% 20% 5% 1	330
	21st to end	Day	21% 20% 41% 17% 1	363
January	1st to 10th	Night	15% 14% 41% 24% 6%	1050
	11th to 20th	Night	18% 16% 40% 21% 4	1031
	21st to end	Night	16% 14% 42% 26% 2	1100
February	1st to 10th	Night	18% 13% 42% 24% 3	1000
	11th to 20th	Night	18% 16% 39% 24% 3	979
	21st to end	Night	20% 15% 45% 18% 3	625
March	1st to 10th	Night	17% 14% 41% 25% 3	600
	11th to 20th	Night	20% 11% 35% 28% 5%	600
	21st to end	Night	26% 12% 37% 21% 4	660
April	1st to 10th	Night	14% 14% 38% 30% 4 1	600
	11th to 20th	Night	18% 13% 33% 28% 8%	593
	21st to end	Night	19% 10% 37% 27% 7%	600
May	1st to 10th	Night	16% 7% 34% 36% 8%	600
	11th to 20th	Night	15% 7% 27% 35% 15% 1	591
	21st to end	Night	12% 5% 30% 32% 19% 2	650
June	1st to 10th	Night	7% 4 16% 44% 27% 2	600
	11th to 20th	Night	6% 2 24% 46% 21% 2	600
	21st to end	Night	5% 2 28% 45% 20% 1	600
July	1st to 10th	Night	10% 2 11% 41% 32% 4	585
	11th to 20th	Night	4 1 14% 44% 34% 2	582
	21st to end	Night	8% 2 12% 42% 35% 2	657
August	1st to 10th	Night	6% 1 12% 48% 32% 1	597
	11th to 20th	Night	6% 3 12% 44% 32% 3	594
	21st to end	Night	6% 1 13% 39% 38% 3	660
September	1st to 10th	Night	11% 2 14% 44% 26% 4	600
	11th to 20th	Night	10% 3 16% 39% 28% 6%	600
	21st to end	Night	8% 4 21% 42% 22% 4	650
October	1st to 10th	Night	10% 4 28% 35% 20% 3	800
	11th to 20th	Night	15% 8% 38% 30% 10%	800
	21st to end	Night	20% 11% 34% 27% 9%	880
November	1st to 10th	Night	13% 8% 37% 33% 9%	820
	11th to 20th	Night	14% 12% 38% 29% 7%	945
	21st to end	Night	20% 13% 36% 25% 5%	1050
December	1st to 10th	Night	17% 13% 39% 25% 5%	1050
	11th to 20th	Night	21% 11% 37% 27% 4	1050
	21st to end	Night	20% 16% 37% 24% 3	1155

Page generated at 2026-01-14 00:14:27. Version ac07

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