Joe Kurz Wildlife Management Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Joe Kurz Wildlife Management 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	12% 6% 2 6% 5% 5% 5% 4 6% 8% 42%	127060
	Night	12% 6% 2 6% 4 4 4 4 6% 8% 45%	124311
Transparency	Day	37% 8% 12% 19% 18% 6%	130871
	Night	36% 7% 11% 19% 20% 8%	128568
Seeing	Day	16% 10% 23% 25% 18% 9%	16385
	Night	15% 9% 22% 29% 21% 4	26414

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	15% 8% 3 4 3 2 3 3 4 5% 50%	4065
	11th to 20th	Day	10% 8% 3 4 3 2 2 3 5% 7% 52%	4060
	21st to end	Day	21% 9% 3 7% 3 3 3 3 4 5% 39%	4770
February	1st to 10th	Day	15% 9% 3 6% 4 4 4 4 5% 7% 39%	2000
	11th to 20th	Day	20% 8% 2 6% 3 4 3 3 4 5% 42%	1948
	21st to end	Day	16% 8% 2 7% 4 4 4 4 5% 7% 39%	1650
March	1st to 10th	Day	20% 9% 3 7% 4 4 4 4 5% 6% 35%	4605
	11th to 20th	Day	9% 5% 2 5% 4 4 4 4 5% 7% 50%	4980
	21st to end	Day	16% 6% 2 6% 4 3 4 3 5% 6% 44%	5465
April	1st to 10th	Day	11% 6% 2 6% 5% 4 4 5% 4 7% 46%	2269
	11th to 20th	Day	11% 5% 3 6% 4 3 3 3 6% 7% 50%	2374
	21st to end	Day	8% 4 2 6% 5% 4 4 4 5% 7% 51%	2520
May	1st to 10th	Day	12% 6% 2 7% 5% 5% 5% 4 5% 8% 39%	5862
	11th to 20th	Day	16% 7% 2 7% 5% 5% 5% 4 7% 10% 32%	5861
	21st to end	Day	8% 5% 2 6% 5% 5% 5% 4 7% 8% 44%	6433
June	1st to 10th	Day	9% 7% 2 8% 7% 7% 6% 5% 7% 10% 32%	2600
	11th to 20th	Day	5% 4 2 5% 5% 7% 6% 5% 9% 12% 39%	2600
	21st to end	Day	5% 4 2 7% 7% 8% 6% 6% 8% 10% 36%	2600
July	1st to 10th	Day	8% 6% 3 8% 6% 7% 7% 6% 9% 12% 28%	5900
	11th to 20th	Day	5% 4 2 7% 6% 6% 7% 5% 9% 13% 36%	5900
	21st to end	Day	6% 7% 3 9% 7% 7% 9% 7% 9% 11% 24%	6424
August	1st to 10th	Day	8% 5% 2 7% 5% 6% 6% 6% 9% 12% 34%	4179
	11th to 20th	Day	7% 4 2 5% 5% 5% 6% 4 6% 10% 47%	3849
	21st to end	Day	7% 5% 2 5% 4 5% 6% 5% 6% 9% 46%	4312
September	1st to 10th	Day	12% 6% 2 6% 5% 5% 7% 5% 7% 7% 38%	2212
	11th to 20th	Day	13% 6% 2 6% 4 4 5% 4 7% 8% 41%	2200
	21st to end	Day	13% 5% 2 5% 5% 4 5% 4 4 6% 47%	2200
October	1st to 10th	Day	13% 5% 2 5% 3 3 4 3 4 6% 53%	2200
	11th to 20th	Day	10% 4 1 3 3 2 3 2 4 7% 58%	2120
	21st to end	Day	12% 5% 2 4 3 4 4 2 4 4 55%	2200
November	1st to 10th	Day	11% 7% 2 5% 4 3 5% 3 4 5% 53%	1874
	11th to 20th	Day	13% 4 1 4 3 3 2 3 4 7% 56%	1890
	21st to end	Day	11% 6% 2 6% 3 4 4 4 5% 7% 48%	1890
December	1st to 10th	Day	16% 7% 2 5% 4 3 3 3 5% 5% 47%	3020
	11th to 20th	Day	14% 8% 3 6% 5% 3 4 3 4 5% 45%	3463
	21st to end	Day	19% 8% 3 6% 3 3 4 3 4 6% 42%	4565
January	1st to 10th	Night	14% 8% 2 5% 3 3 3 3 4 5% 49%	5903
	11th to 20th	Night	12% 7% 3 7% 4 3 4 3 4 6% 46%	5900
	21st to end	Night	18% 10% 2 5% 4 3 4 3 5% 5% 42%	6168
February	1st to 10th	Night	14% 8% 2 7% 5% 4 2 3 4 6% 45%	2400
	11th to 20th	Night	20% 8% 2 6% 3 3 3 3 4 5% 43%	2338
	21st to end	Night	15% 7% 3 5% 4 4 4 4 5% 6% 43%	1980
March	1st to 10th	Night	20% 9% 3 6% 4 4 4 3 5% 6% 36%	5246
	11th to 20th	Night	10% 5% 2 5% 4 4 4 3 6% 7% 51%	4980
	21st to end	Night	13% 6% 2 6% 5% 4 4 3 5% 6% 47%	5467
April	1st to 10th	Night	11% 5% 2 5% 5% 4 4 4 6% 6% 48%	2147
	11th to 20th	Night	11% 5% 2 5% 3 3 4 4 5% 7% 51%	1975
	21st to end	Night	6% 5% 2 5% 4 4 4 4 6% 6% 53%	1880
May	1st to 10th	Night	9% 5% 2 6% 4 5% 5% 4 7% 12% 40%	4033
	11th to 20th	Night	17% 7% 2 6% 5% 5% 5% 4 6% 9% 34%	4032
	21st to end	Night	9% 4 2 5% 4 4 5% 4 7% 11% 45%	4421
June	1st to 10th	Night	6% 6% 2 6% 6% 6% 6% 6% 8% 10% 39%	1800
	11th to 20th	Night	4 4 2 6% 5% 4 5% 4 8% 11% 47%	1800
	21st to end	Night	5% 5% 2 7% 6% 5% 5% 5% 9% 12% 40%	1800
July	1st to 10th	Night	8% 6% 3 9% 6% 6% 7% 5% 9% 12% 29%	4058
	11th to 20th	Night	5% 4 2 7% 6% 5% 6% 6% 9% 13% 38%	4057
	21st to end	Night	7% 7% 3 8% 6% 7% 7% 7% 10% 11% 28%	4427
August	1st to 10th	Night	7% 5% 2 7% 6% 7% 7% 5% 9% 12% 33%	2965
	11th to 20th	Night	6% 4 2 6% 5% 4 5% 4 6% 11% 47%	3200
	21st to end	Night	6% 5% 2 5% 3 4 4 4 5% 9% 51%	3586
September	1st to 10th	Night	8% 5% 2 7% 4 5% 5% 5% 8% 10% 41%	2166
	11th to 20th	Night	12% 5% 2 7% 4 4 5% 3 6% 8% 44%	2200
	21st to end	Night	9% 6% 2 7% 5% 4 5% 3 6% 8% 46%	2200
October	1st to 10th	Night	10% 5% 2 5% 3 3 3 3 5% 6% 55%	2200
	11th to 20th	Night	11% 4 1 3 3 3 3 3 4 4 60%	2278
	21st to end	Night	11% 5% 2 5% 3 3 3 3 4 4 58%	2640
November	1st to 10th	Night	11% 6% 1 4 3 3 4 3 4 5% 56%	2639
	11th to 20th	Night	13% 5% 2 5% 3 3 2 3 3 5% 56%	2730
	21st to end	Night	12% 6% 2 6% 4 3 4 3 5% 6% 49%	2730
December	1st to 10th	Night	14% 7% 2 5% 3 3 3 2 4 6% 51%	4380
	11th to 20th	Night	15% 5% 2 5% 3 3 4 3 5% 7% 48%	4952
	21st to end	Night	18% 8% 3 6% 4 3 4 3 4 6% 41%	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	36% 4 5% 20% 27% 7%	4066
	11th to 20th	Day	32% 3 5% 20% 30% 10%	4060
	21st to end	Day	47% 3 7% 14% 20% 9%	4770
February	1st to 10th	Day	44% 5% 8% 17% 20% 6%	2000
	11th to 20th	Day	45% 3 6% 17% 22% 7%	1958
	21st to end	Day	44% 6% 8% 14% 20% 9%	1650
March	1st to 10th	Day	48% 5% 7% 11% 22% 6%	4605
	11th to 20th	Day	32% 6% 7% 14% 22% 20%	4980
	21st to end	Day	41% 4 7% 19% 20% 9%	5465
April	1st to 10th	Day	37% 7% 9% 21% 18% 9%	2269
	11th to 20th	Day	33% 6% 9% 19% 24% 10%	2374
	21st to end	Day	31% 7% 10% 22% 26% 4	2520
May	1st to 10th	Day	40% 8% 13% 20% 17% 2	5897
	11th to 20th	Day	44% 9% 18% 18% 9% 1	5865
	21st to end	Day	35% 9% 13% 22% 19% 1	6447
June	1st to 10th	Day	43% 11% 15% 18% 11% 2	2600
	11th to 20th	Day	33% 10% 20% 21% 15% 1	2600
	21st to end	Day	39% 12% 17% 18% 11% 3	2600
July	1st to 10th	Day	43% 13% 20% 19% 4 1	5835
	11th to 20th	Day	35% 14% 29% 18% 4 1	5831
	21st to end	Day	46% 15% 19% 17% 3	6240
August	1st to 10th	Day	38% 11% 16% 26% 8%	4166
	11th to 20th	Day	30% 10% 15% 30% 14% 1	3885
	21st to end	Day	31% 10% 17% 24% 15% 3	4311
September	1st to 10th	Day	41% 9% 15% 15% 15% 4	2212
	11th to 20th	Day	39% 8% 12% 20% 18% 3	2200
	21st to end	Day	37% 6% 9% 22% 20% 6%	2200
October	1st to 10th	Day	27% 5% 7% 14% 32% 15%	3590
	11th to 20th	Day	17% 3 5% 17% 29% 30%	3438
	21st to end	Day	24% 3 5% 17% 39% 12%	3538
November	1st to 10th	Day	34% 4 7% 15% 27% 12%	1874
	11th to 20th	Day	29% 4 9% 18% 26% 14%	1890
	21st to end	Day	36% 6% 9% 17% 25% 8%	1890
December	1st to 10th	Day	39% 4 6% 17% 25% 8%	3020
	11th to 20th	Day	42% 3 8% 18% 21% 8%	3460
	21st to end	Day	41% 5% 8% 21% 22% 3	4565
January	1st to 10th	Night	36% 5% 5% 20% 27% 7%	5903
	11th to 20th	Night	37% 5% 6% 18% 25% 9%	5900
	21st to end	Night	44% 4 5% 13% 27% 6%	6168
February	1st to 10th	Night	41% 4 7% 18% 20% 10%	2400
	11th to 20th	Night	44% 4 5% 16% 21% 9%	2339
	21st to end	Night	41% 6% 8% 14% 18% 13%	1980
March	1st to 10th	Night	48% 5% 8% 14% 15% 10%	5246
	11th to 20th	Night	32% 5% 9% 13% 23% 18%	4980
	21st to end	Night	38% 5% 6% 19% 21% 10%	5467
April	1st to 10th	Night	35% 7% 9% 19% 19% 11%	2147
	11th to 20th	Night	32% 5% 7% 21% 24% 11%	1975
	21st to end	Night	29% 7% 13% 22% 23% 6%	1880
May	1st to 10th	Night	34% 11% 18% 21% 15% 2	4060
	11th to 20th	Night	44% 9% 16% 21% 8% 1	4033
	21st to end	Night	30% 7% 19% 24% 18% 2	4429
June	1st to 10th	Night	35% 13% 18% 19% 15% 1	1800
	11th to 20th	Night	27% 11% 21% 28% 11% 2	1800
	21st to end	Night	32% 11% 22% 19% 13% 3	1800
July	1st to 10th	Night	43% 13% 21% 17% 5% 1	4015
	11th to 20th	Night	33% 15% 31% 18% 4 1	4006
	21st to end	Night	45% 14% 23% 15% 3 1	4297
August	1st to 10th	Night	38% 12% 18% 25% 7%	2954
	11th to 20th	Night	29% 9% 16% 30% 14% 1	3230
	21st to end	Night	29% 9% 15% 25% 20% 3	3586
September	1st to 10th	Night	34% 11% 17% 19% 15% 4	2166
	11th to 20th	Night	37% 9% 11% 22% 17% 4	2200
	21st to end	Night	35% 8% 12% 18% 20% 8%	2200
October	1st to 10th	Night	29% 5% 9% 14% 28% 15%	3590
	11th to 20th	Night	17% 3 4 15% 30% 32%	3699
	21st to end	Night	21% 4 4 20% 34% 18%	4252
November	1st to 10th	Night	31% 5% 8% 15% 27% 14%	2639
	11th to 20th	Night	32% 4 5% 17% 27% 15%	2730
	21st to end	Night	36% 6% 7% 17% 25% 9%	2730
December	1st to 10th	Night	36% 3 6% 19% 27% 9%	4380
	11th to 20th	Night	37% 4 11% 16% 24% 7%	4954
	21st to end	Night	43% 5% 7% 23% 20% 2	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	28% 19% 39% 13% 1	303
	11th to 20th	Day	24% 23% 32% 13% 6% 2	300
	21st to end	Day	24% 24% 37% 9% 5% 1	330
February	1st to 10th	Day	26% 20% 36% 15% 3	300
	11th to 20th	Day	36% 20% 33% 10% 2	300
	21st to end	Day	26% 24% 34% 14% 2	249
March	1st to 10th	Day	27% 18% 34% 16% 4 1	347
	11th to 20th	Day	23% 20% 31% 18% 8% 1	500
	21st to end	Day	20% 20% 31% 23% 6% 1	550
April	1st to 10th	Day	19% 17% 33% 21% 9% 1	500
	11th to 20th	Day	15% 16% 32% 23% 12% 2	492
	21st to end	Day	13% 12% 30% 26% 15% 3	500
May	1st to 10th	Day	13% 13% 29% 28% 14% 5%	503
	11th to 20th	Day	13% 7% 24% 32% 16% 8%	527
	21st to end	Day	12% 7% 18% 33% 19% 11%	573
June	1st to 10th	Day	11% 4 18% 30% 25% 11%	530
	11th to 20th	Day	6% 3 15% 31% 27% 18%	530
	21st to end	Day	8% 2 15% 29% 28% 17%	530
July	1st to 10th	Day	8% 2 10% 25% 30% 24%	525
	11th to 20th	Day	7% 2 6% 23% 37% 25%	524
	21st to end	Day	8% 2 7% 28% 34% 22%	576
August	1st to 10th	Day	13% 2 11% 25% 27% 22%	526
	11th to 20th	Day	9% 2 9% 25% 35% 21%	519
	21st to end	Day	14% 2 10% 31% 27% 16%	583
September	1st to 10th	Day	12% 3 12% 29% 29% 14%	530
	11th to 20th	Day	16% 3 11% 30% 30% 10%	530
	21st to end	Day	13% 2 18% 29% 28% 9%	530
October	1st to 10th	Day	15% 5% 26% 29% 18% 7%	530
	11th to 20th	Day	12% 8% 21% 32% 22% 5%	530
	21st to end	Day	17% 9% 25% 27% 17% 4	583
November	1st to 10th	Day	20% 11% 27% 26% 14% 3	352
	11th to 20th	Day	16% 15% 39% 23% 6% 1	330
	21st to end	Day	14% 19% 38% 21% 7% 1	330
December	1st to 10th	Day	25% 22% 32% 17% 4 1	330
	11th to 20th	Day	26% 15% 35% 17% 6% 1	330
	21st to end	Day	27% 16% 35% 17% 4 1	363
January	1st to 10th	Night	22% 20% 31% 22% 5%	805
	11th to 20th	Night	21% 17% 29% 26% 7%	800
	21st to end	Night	22% 16% 36% 23% 3	880
February	1st to 10th	Night	19% 14% 33% 29% 6%	800
	11th to 20th	Night	25% 16% 32% 24% 3	783
	21st to end	Night	20% 18% 34% 25% 3	660
March	1st to 10th	Night	17% 16% 33% 28% 6%	800
	11th to 20th	Night	17% 16% 33% 24% 10%	800
	21st to end	Night	17% 15% 30% 28% 10%	880
April	1st to 10th	Night	15% 14% 32% 28% 11%	747
	11th to 20th	Night	15% 14% 26% 30% 13% 1	593
	21st to end	Night	9% 9% 24% 39% 19% 1	600
May	1st to 10th	Night	9% 8% 26% 34% 22% 2	600
	11th to 20th	Night	14% 4 20% 35% 22% 5%	591
	21st to end	Night	13% 2 14% 35% 31% 6%	650
June	1st to 10th	Night	7% 1 13% 40% 34% 5%	600
	11th to 20th	Night	5% 2 14% 31% 36% 13%	600
	21st to end	Night	6% 2 9% 33% 41% 10%	600
July	1st to 10th	Night	8% 2 6% 25% 46% 12%	585
	11th to 20th	Night	7% 1 5% 22% 48% 18%	582
	21st to end	Night	6% 1 6% 26% 48% 12%	657
August	1st to 10th	Night	8% 1 7% 29% 43% 13%	597
	11th to 20th	Night	11% 1 5% 28% 43% 11%	594
	21st to end	Night	14% 1 9% 28% 36% 13%	660
September	1st to 10th	Night	8% 2 10% 29% 40% 11%	766
	11th to 20th	Night	14% 2 11% 31% 37% 6%	800
	21st to end	Night	12% 3 13% 35% 33% 4	800
October	1st to 10th	Night	12% 4 20% 35% 24% 6%	800
	11th to 20th	Night	13% 8% 22% 32% 24% 3	800
	21st to end	Night	14% 8% 23% 33% 19% 3	880
November	1st to 10th	Night	16% 7% 22% 35% 20% 1	820
	11th to 20th	Night	15% 10% 29% 30% 14% 1	840
	21st to end	Night	16% 13% 28% 30% 13% 1	840
December	1st to 10th	Night	19% 14% 30% 27% 10%	840
	11th to 20th	Night	20% 12% 30% 29% 8% 1	840
	21st to end	Night	25% 14% 25% 28% 8%	924

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