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 2024-11-28.

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%	101345
	Night	12% 7% 3 6% 4 4 4 3 5% 6% 47%	98277
Transparency	Day	38% 6% 12% 26% 16% 2	104994
	Night	37% 5% 11% 25% 18% 3	102768
Seeing	Day	15% 10% 27% 28% 17% 4	15718
	Night	14% 9% 31% 31% 13% 1	25561

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% 10% 3 9% 5% 4 5% 4 5% 5% 37%	2824
	11th to 20th	Day	12% 12% 4 8% 5% 7% 5% 3 4 4 37%	2850
	21st to end	Day	15% 16% 4 8% 3 3 3 2 4 5% 36%	3135
February	1st to 10th	Day	15% 12% 5% 8% 5% 4 3 3 5% 6% 35%	1710
	11th to 20th	Day	14% 8% 3 8% 4 3 4 4 4 5% 41%	1664
	21st to end	Day	15% 9% 3 7% 4 3 4 4 5% 6% 40%	1615
March	1st to 10th	Day	15% 11% 3 6% 4 3 3 3 4 4 46%	3436
	11th to 20th	Day	13% 7% 2 5% 3 3 3 3 5% 7% 49%	3480
	21st to end	Day	18% 13% 4 7% 5% 3 3 3 5% 6% 34%	3814
April	1st to 10th	Day	13% 7% 3 7% 5% 4 3 3 5% 6% 44%	2249
	11th to 20th	Day	16% 9% 2 5% 4 4 4 3 6% 6% 41%	2254
	21st to end	Day	20% 7% 3 7% 5% 5% 4 3 5% 6% 35%	2310
May	1st to 10th	Day	16% 7% 3 6% 5% 5% 5% 3 6% 8% 36%	4082
	11th to 20th	Day	16% 7% 3 6% 5% 4 4 4 6% 7% 39%	4082
	21st to end	Day	12% 7% 2 5% 5% 4 5% 4 5% 8% 44%	4784
June	1st to 10th	Day	7% 4 2 5% 5% 4 4 4 8% 10% 47%	2660
	11th to 20th	Day	7% 4 2 6% 5% 5% 4 4 6% 9% 47%	2660
	21st to end	Day	6% 3 1 5% 5% 4 4 5% 6% 10% 51%	2660
July	1st to 10th	Day	12% 7% 2 6% 3 4 4 3 6% 8% 44%	4322
	11th to 20th	Day	5% 4 2 6% 4 4 4 4 6% 10% 51%	4120
	21st to end	Day	7% 4 2 6% 4 6% 6% 5% 9% 11% 41%	4465
August	1st to 10th	Day	5% 3 2 5% 4 4 4 4 6% 10% 53%	4104
	11th to 20th	Day	10% 6% 2 6% 4 5% 4 4 5% 8% 47%	4014
	21st to end	Day	5% 3 2 5% 3 4 3 4 6% 10% 55%	4180
September	1st to 10th	Day	11% 4 2 5% 3 4 3 3 5% 7% 53%	2280
	11th to 20th	Day	10% 4 2 5% 3 3 4 4 6% 6% 52%	2204
	21st to end	Day	8% 6% 2 5% 3 4 4 3 4 6% 55%	2023
October	1st to 10th	Day	12% 4 2 5% 3 3 3 3 4 7% 55%	1900
	11th to 20th	Day	13% 6% 3 5% 2 2 2 2 3 5% 55%	1900
	21st to end	Day	17% 8% 3 7% 3 3 2 2 4 5% 47%	2090
November	1st to 10th	Day	11% 6% 2 5% 3 3 4 3 4 6% 53%	1958
	11th to 20th	Day	14% 6% 2 6% 3 3 3 3 4 6% 50%	1719
	21st to end	Day	15% 8% 3 6% 3 3 2 3 4 5% 46%	1576
December	1st to 10th	Day	12% 9% 3 7% 4 3 3 3 5% 7% 44%	1520
	11th to 20th	Day	12% 11% 4 7% 4 4 4 3 5% 5% 41%	1918
	21st to end	Day	17% 16% 7% 10% 4 4 4 3 4 5% 26%	2783
January	1st to 10th	Night	11% 10% 4 15% 5% 5% 3 3 3 4 39%	4127
	11th to 20th	Night	13% 8% 4 11% 6% 7% 5% 4 4 4 35%	4120
	21st to end	Night	18% 14% 4 9% 3 3 3 3 3 5% 34%	4532
February	1st to 10th	Night	14% 10% 4 7% 5% 4 5% 3 5% 6% 37%	2470
	11th to 20th	Night	13% 9% 3 8% 4 3 3 3 4 6% 43%	2403
	21st to end	Night	14% 9% 4 7% 3 3 4 4 4 4 45%	1852
March	1st to 10th	Night	16% 10% 3 5% 4 3 3 3 4 5% 45%	3419
	11th to 20th	Night	12% 6% 2 4 3 3 3 3 5% 6% 53%	3480
	21st to end	Night	17% 9% 4 9% 5% 4 4 3 4 5% 35%	3817
April	1st to 10th	Night	10% 7% 2 6% 3 4 4 3 5% 6% 51%	1930
	11th to 20th	Night	15% 8% 3 6% 3 2 3 3 5% 7% 47%	1875
	21st to end	Night	18% 7% 2 6% 4 3 4 3 5% 7% 41%	1867
May	1st to 10th	Night	15% 8% 2 7% 4 4 4 3 5% 7% 40%	2823
	11th to 20th	Night	14% 8% 3 6% 3 4 4 3 5% 9% 41%	2823
	21st to end	Night	11% 4 1 5% 4 3 4 4 5% 7% 51%	2780
June	1st to 10th	Night	7% 3 1 4 4 3 4 4 7% 9% 54%	1520
	11th to 20th	Night	4 3 1 5% 5% 4 4 3 8% 12% 51%	1520
	21st to end	Night	4 2 1 3 3 4 5% 3 7% 9% 59%	1520
July	1st to 10th	Night	12% 7% 2 5% 3 4 3 3 6% 7% 47%	2643
	11th to 20th	Night	3 3 1 4 3 3 3 4 6% 10% 59%	2850
	21st to end	Night	6% 4 2 5% 3 4 4 4 7% 10% 50%	3098
August	1st to 10th	Night	3 1 1 3 3 4 4 3 6% 9% 63%	2836
	11th to 20th	Night	11% 5% 2 5% 4 3 3 3 4 7% 52%	2824
	21st to end	Night	3 3 1 4 4 4 4 4 5% 8% 59%	3476
September	1st to 10th	Night	11% 4 2 4 3 3 2 3 5% 7% 58%	1900
	11th to 20th	Night	10% 4 1 4 3 4 3 4 4 8% 55%	1971
	21st to end	Night	8% 4 1 5% 4 3 4 3 4 6% 57%	2137
October	1st to 10th	Night	8% 4 2 4 3 3 4 3 5% 6% 60%	2280
	11th to 20th	Night	13% 4 2 4 3 3 3 3 4 5% 56%	2280
	21st to end	Night	15% 6% 2 5% 3 3 3 2 4 5% 51%	2508
November	1st to 10th	Night	11% 6% 1 3 3 3 4 2 4 5% 57%	2340
	11th to 20th	Night	10% 7% 2 5% 5% 3 3 3 5% 6% 51%	2674
	21st to end	Night	15% 8% 2 5% 4 3 3 2 3 5% 48%	2759
December	1st to 10th	Night	13% 9% 3 6% 4 4 3 3 5% 6% 43%	2660
	11th to 20th	Night	14% 9% 3 7% 4 3 3 3 4 5% 44%	3279
	21st to end	Night	17% 17% 5% 10% 4 4 3 3 3 4 28%	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	48% 5% 9% 26% 11%	2825
	11th to 20th	Day	52% 4 11% 22% 11%	2850
	21st to end	Day	53% 4 10% 17% 15% 1	3135
February	1st to 10th	Day	51% 4 12% 21% 11% 1	1710
	11th to 20th	Day	45% 5% 12% 21% 15% 2	1673
	21st to end	Day	45% 5% 10% 22% 15% 4	1615
March	1st to 10th	Day	42% 4 8% 24% 19% 3	3436
	11th to 20th	Day	36% 5% 11% 27% 17% 4	3480
	21st to end	Day	51% 6% 17% 20% 5%	3814
April	1st to 10th	Day	42% 5% 11% 24% 17% 2	2249
	11th to 20th	Day	42% 6% 13% 24% 14% 2	2254
	21st to end	Day	50% 5% 12% 21% 12% 1	2310
May	1st to 10th	Day	46% 8% 13% 21% 12% 1	4120
	11th to 20th	Day	43% 8% 12% 24% 13%	4086
	21st to end	Day	38% 8% 11% 29% 13% 1	4797
June	1st to 10th	Day	30% 9% 16% 28% 16% 1	2660
	11th to 20th	Day	32% 8% 15% 28% 16% 2	2660
	21st to end	Day	27% 7% 16% 31% 15% 4	2660
July	1st to 10th	Day	39% 7% 11% 25% 16% 3	4256
	11th to 20th	Day	27% 8% 14% 34% 16% 1	4051
	21st to end	Day	31% 10% 19% 29% 10% 1	4325
August	1st to 10th	Day	26% 6% 17% 29% 21% 1	4090
	11th to 20th	Day	36% 6% 14% 27% 15% 2	4053
	21st to end	Day	23% 6% 15% 38% 14% 4	4179
September	1st to 10th	Day	31% 6% 13% 25% 18% 7%	2280
	11th to 20th	Day	30% 5% 9% 27% 26% 2	2204
	21st to end	Day	30% 5% 10% 29% 22% 4	2023
October	1st to 10th	Day	18% 3 6% 20% 38% 14%	3160
	11th to 20th	Day	22% 2 5% 24% 39% 9%	3140
	21st to end	Day	37% 3 7% 24% 25% 3	3428
November	1st to 10th	Day	33% 5% 12% 26% 20% 4	1958
	11th to 20th	Day	37% 4 9% 23% 22% 4	1719
	21st to end	Day	42% 3 9% 28% 17% 1	1576
December	1st to 10th	Day	41% 4 12% 30% 12% 1	1520
	11th to 20th	Day	45% 5% 12% 26% 10% 2	1915
	21st to end	Day	60% 4 11% 16% 8% 1	2783
January	1st to 10th	Night	50% 4 12% 22% 12% 1	4127
	11th to 20th	Night	54% 3 11% 21% 10% 1	4120
	21st to end	Night	54% 3 11% 20% 10% 1	4532
February	1st to 10th	Night	48% 5% 12% 20% 13% 2	2470
	11th to 20th	Night	42% 4 12% 22% 17% 3	2404
	21st to end	Night	43% 4 9% 21% 17% 5%	1852
March	1st to 10th	Night	41% 5% 9% 22% 18% 4	3419
	11th to 20th	Night	33% 5% 8% 26% 25% 3	3480
	21st to end	Night	51% 6% 13% 23% 7% 1	3817
April	1st to 10th	Night	35% 5% 11% 24% 22% 4	1930
	11th to 20th	Night	38% 5% 9% 26% 17% 5%	1875
	21st to end	Night	44% 5% 10% 25% 15% 1	1867
May	1st to 10th	Night	42% 9% 14% 19% 15% 2	2850
	11th to 20th	Night	39% 8% 13% 27% 11% 1	2824
	21st to end	Night	33% 7% 12% 24% 23% 1	2788
June	1st to 10th	Night	25% 7% 16% 32% 16% 4	1520
	11th to 20th	Night	24% 9% 13% 29% 21% 3	1520
	21st to end	Night	20% 6% 17% 31% 21% 5%	1520
July	1st to 10th	Night	35% 5% 12% 27% 18% 3	2600
	11th to 20th	Night	20% 5% 14% 38% 21% 3	2796
	21st to end	Night	26% 6% 21% 34% 12% 1	2999
August	1st to 10th	Night	16% 6% 22% 31% 23% 2	2826
	11th to 20th	Night	33% 4 12% 29% 21% 1	2851
	21st to end	Night	22% 6% 13% 37% 17% 4	3476
September	1st to 10th	Night	28% 5% 11% 27% 23% 8%	1900
	11th to 20th	Night	28% 5% 11% 26% 24% 5%	1971
	21st to end	Night	27% 5% 9% 27% 28% 4	2137
October	1st to 10th	Night	16% 3 5% 22% 41% 11%	3800
	11th to 20th	Night	22% 3 7% 23% 29% 16%	3779
	21st to end	Night	33% 4 7% 28% 25% 3	4120
November	1st to 10th	Night	30% 4 11% 28% 21% 6%	2340
	11th to 20th	Night	35% 4 8% 25% 23% 5%	2674
	21st to end	Night	41% 3 9% 28% 17% 3	2759
December	1st to 10th	Night	42% 5% 12% 25% 15% 1	2660
	11th to 20th	Night	43% 4 10% 28% 13% 1	3281
	21st to end	Night	61% 4 8% 17% 8% 2	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	19% 17% 35% 24% 4	270
	11th to 20th	Day	31% 13% 39% 16% 1	270
	21st to end	Day	14% 19% 46% 17% 3	297
February	1st to 10th	Day	28% 14% 37% 18% 3	270
	11th to 20th	Day	19% 24% 36% 15% 4 1	270
	21st to end	Day	24% 22% 38% 12% 3	225
March	1st to 10th	Day	18% 18% 45% 17% 2	270
	11th to 20th	Day	29% 16% 33% 19% 3	270
	21st to end	Day	35% 20% 28% 12% 5%	297
April	1st to 10th	Day	18% 18% 34% 23% 6% 1	429
	11th to 20th	Day	21% 15% 34% 23% 7%	452
	21st to end	Day	24% 13% 31% 23% 9%	490
May	1st to 10th	Day	17% 14% 36% 23% 9% 1	653
	11th to 20th	Day	17% 11% 28% 28% 13% 3	675
	21st to end	Day	16% 8% 28% 26% 17% 6%	734
June	1st to 10th	Day	7% 4 20% 36% 25% 8%	680
	11th to 20th	Day	9% 2 25% 37% 23% 5%	680
	21st to end	Day	5% 6% 29% 36% 19% 4	680
July	1st to 10th	Day	12% 3 14% 30% 30% 12%	671
	11th to 20th	Day	5% 2 19% 36% 29% 9%	668
	21st to end	Day	9% 2 15% 34% 31% 9%	739
August	1st to 10th	Day	8% 2 15% 41% 29% 5%	676
	11th to 20th	Day	8% 4 20% 34% 28% 6%	651
	21st to end	Day	9% 2 10% 32% 36% 11%	539
September	1st to 10th	Day	11% 3 15% 34% 28% 8%	490
	11th to 20th	Day	7% 3 14% 39% 27% 9%	414
	21st to end	Day	11% 6% 25% 32% 19% 7%	300
October	1st to 10th	Day	15% 7% 28% 26% 18% 7%	300
	11th to 20th	Day	13% 14% 38% 25% 9%	300
	21st to end	Day	24% 18% 32% 22% 4 1	330
November	1st to 10th	Day	16% 12% 37% 25% 8% 4	300
	11th to 20th	Day	16% 20% 31% 23% 8% 2	300
	21st to end	Day	24% 15% 28% 26% 6%	291
December	1st to 10th	Day	15% 14% 41% 19% 9% 1	270
	11th to 20th	Day	22% 16% 34% 22% 5% 1	270
	21st to end	Day	22% 22% 41% 16%	297
January	1st to 10th	Night	15% 14% 40% 24% 7%	950
	11th to 20th	Night	19% 16% 39% 22% 4 1	950
	21st to end	Night	16% 14% 41% 27% 2	1045
February	1st to 10th	Night	18% 14% 42% 23% 3	950
	11th to 20th	Night	17% 15% 40% 25% 3	929
	21st to end	Night	21% 15% 44% 17% 3	596
March	1st to 10th	Night	17% 13% 42% 24% 4	570
	11th to 20th	Night	20% 11% 35% 29% 5%	570
	21st to end	Night	26% 12% 35% 22% 4	627
April	1st to 10th	Night	14% 13% 39% 29% 4 1	570
	11th to 20th	Night	18% 12% 33% 29% 8%	563
	21st to end	Night	19% 10% 37% 27% 8%	570
May	1st to 10th	Night	16% 7% 34% 35% 8%	570
	11th to 20th	Night	15% 6% 27% 35% 14% 1	561
	21st to end	Night	12% 5% 30% 31% 20% 2	617
June	1st to 10th	Night	7% 4 16% 44% 27% 2	570
	11th to 20th	Night	6% 1 25% 46% 20% 2	570
	21st to end	Night	4 2 28% 45% 20% 1	570
July	1st to 10th	Night	10% 2 12% 41% 32% 4	555
	11th to 20th	Night	4 1 14% 44% 35% 2	552
	21st to end	Night	8% 2 13% 41% 35% 2	624
August	1st to 10th	Night	6% 1 12% 47% 33% 1	567
	11th to 20th	Night	6% 2 13% 45% 31% 3	564
	21st to end	Night	6% 1 13% 39% 38% 3	627
September	1st to 10th	Night	11% 1 14% 43% 27% 4	570
	11th to 20th	Night	10% 3 16% 38% 27% 6%	570
	21st to end	Night	8% 4 22% 42% 21% 3	617
October	1st to 10th	Night	10% 4 28% 34% 20% 3	760
	11th to 20th	Night	15% 7% 39% 29% 9%	760
	21st to end	Night	19% 11% 34% 27% 9%	836
November	1st to 10th	Night	13% 8% 37% 33% 9%	780
	11th to 20th	Night	14% 13% 37% 29% 8%	900
	21st to end	Night	19% 13% 38% 25% 6%	986
December	1st to 10th	Night	17% 12% 40% 25% 6%	950
	11th to 20th	Night	21% 11% 36% 28% 4	950
	21st to end	Night	19% 17% 37% 24% 2	1045

Page generated at 2024-11-24 23:22:20. Version ac07

Copyright © 2024 Attilla Danko.