Weiser State Forest
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Weiser State Forest clear sky chart from 2005-11-06 to 2024-07-31.

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% 8% 3 7% 5% 4 4 4 5% 7% 36%	90057
	Night	16% 8% 3 7% 5% 4 4 4 5% 7% 38%	89769
Transparency	Day	45% 7% 12% 21% 13% 2	89783
	Night	44% 7% 12% 21% 13% 2	89597
Seeing	Day	23% 14% 28% 20% 11% 4	14478
	Night	21% 13% 26% 28% 11% 1	23845

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	15% 12% 3 7% 5% 4 4 3 4 5% 38%	2517
	11th to 20th	Day	14% 14% 5% 14% 6% 5% 4 4 5% 6% 23%	2722
	21st to end	Day	20% 12% 5% 9% 6% 4 4 3 4 5% 27%	3124
February	1st to 10th	Day	16% 11% 3 7% 5% 6% 5% 4 5% 6% 32%	1710
	11th to 20th	Day	15% 9% 4 9% 5% 4 4 4 6% 7% 34%	1709
	21st to end	Day	18% 11% 5% 8% 4 4 4 3 4 6% 33%	1570
March	1st to 10th	Day	25% 8% 2 6% 4 4 4 3 4 6% 34%	3297
	11th to 20th	Day	10% 8% 3 8% 5% 5% 4 4 5% 7% 41%	3480
	21st to end	Day	20% 9% 3 6% 4 3 3 3 4 5% 42%	3928
April	1st to 10th	Day	16% 9% 3 8% 5% 5% 4 4 5% 6% 35%	2280
	11th to 20th	Day	16% 8% 2 7% 4 5% 4 4 5% 7% 39%	2254
	21st to end	Day	18% 5% 3 7% 5% 4 4 4 6% 7% 38%	2280
May	1st to 10th	Day	29% 7% 2 5% 5% 4 4 3 4 6% 31%	4130
	11th to 20th	Day	23% 8% 3 8% 6% 5% 5% 4 5% 7% 27%	4398
	21st to end	Day	13% 6% 2 5% 4 4 5% 4 6% 9% 42%	4837
June	1st to 10th	Day	13% 7% 2 6% 6% 5% 4 4 7% 8% 37%	2660
	11th to 20th	Day	13% 7% 3 7% 5% 4 5% 5% 7% 8% 37%	2660
	21st to end	Day	11% 5% 2 6% 4 5% 5% 5% 7% 10% 40%	2660
July	1st to 10th	Day	10% 6% 3 7% 5% 5% 6% 5% 7% 10% 37%	2660
	11th to 20th	Day	8% 5% 2 6% 4 4 6% 5% 7% 10% 43%	2660
	21st to end	Day	10% 7% 3 7% 6% 5% 7% 4 6% 8% 37%	2735
August	1st to 10th	Day	10% 6% 2 6% 6% 6% 5% 6% 8% 11% 35%	2327
	11th to 20th	Day	13% 6% 3 6% 5% 5% 5% 4 7% 9% 38%	2221
	21st to end	Day	13% 5% 2 6% 4 4 5% 5% 7% 9% 40%	2376
September	1st to 10th	Day	17% 6% 2 6% 4 3 4 3 5% 7% 44%	2160
	11th to 20th	Day	13% 5% 2 5% 4 3 5% 3 6% 7% 49%	2160
	21st to end	Day	19% 8% 2 5% 3 4 4 4 5% 6% 40%	1905
October	1st to 10th	Day	18% 6% 1 6% 4 4 4 4 5% 8% 40%	1800
	11th to 20th	Day	19% 6% 2 5% 5% 4 3 3 6% 6% 40%	1800
	21st to end	Day	19% 7% 3 7% 4 3 4 4 5% 7% 37%	1980
November	1st to 10th	Day	14% 7% 3 5% 3 3 3 3 6% 7% 46%	1685
	11th to 20th	Day	18% 7% 2 6% 4 4 4 4 5% 6% 40%	1654
	21st to end	Day	18% 8% 3 6% 5% 4 6% 4 5% 6% 37%	1520
December	1st to 10th	Day	19% 11% 3 9% 4 5% 4 4 5% 6% 31%	1520
	11th to 20th	Day	21% 10% 3 6% 4 4 4 3 5% 6% 34%	1906
	21st to end	Day	19% 12% 4 9% 6% 6% 5% 4 6% 5% 25%	2772
January	1st to 10th	Night	15% 11% 3 8% 5% 5% 4 3 5% 7% 34%	4429
	11th to 20th	Night	17% 10% 5% 10% 5% 4 4 3 5% 5% 31%	4234
	21st to end	Night	23% 10% 3 9% 4 4 4 3 4 5% 30%	4532
February	1st to 10th	Night	16% 10% 3 7% 5% 4 5% 4 5% 6% 35%	2470
	11th to 20th	Night	15% 10% 3 7% 5% 5% 5% 5% 5% 6% 33%	2356
	21st to end	Night	17% 9% 4 7% 5% 5% 4 3 5% 6% 35%	1884
March	1st to 10th	Night	22% 12% 3 7% 4 3 4 3 3 4 35%	3542
	11th to 20th	Night	11% 9% 3 8% 4 4 4 4 4 5% 44%	3479
	21st to end	Night	16% 10% 3 6% 4 3 4 3 4 5% 44%	3702
April	1st to 10th	Night	17% 10% 3 7% 6% 4 4 4 6% 7% 33%	1900
	11th to 20th	Night	15% 7% 3 6% 5% 4 4 4 6% 8% 39%	1875
	21st to end	Night	18% 5% 3 6% 4 4 3 3 5% 7% 42%	1900
May	1st to 10th	Night	27% 8% 3 6% 5% 4 4 3 5% 6% 30%	2822
	11th to 20th	Night	25% 9% 4 7% 4 4 4 4 5% 6% 28%	2495
	21st to end	Night	12% 6% 2 7% 5% 4 4 3 6% 10% 41%	2738
June	1st to 10th	Night	14% 6% 2 5% 4 3 5% 4 6% 7% 44%	1520
	11th to 20th	Night	12% 6% 3 5% 5% 5% 4 5% 5% 10% 41%	1520
	21st to end	Night	11% 5% 2 5% 5% 4 6% 4 7% 9% 42%	1520
July	1st to 10th	Night	11% 6% 3 7% 5% 5% 5% 4 7% 8% 39%	1520
	11th to 20th	Night	6% 5% 2 6% 5% 5% 5% 5% 7% 10% 44%	1520
	21st to end	Night	11% 6% 2 5% 5% 5% 5% 4 7% 9% 40%	1809
August	1st to 10th	Night	11% 6% 2 6% 4 5% 4 4 7% 10% 41%	1611
	11th to 20th	Night	12% 6% 3 7% 5% 5% 5% 4 6% 8% 39%	1660
	21st to end	Night	11% 6% 3 6% 4 5% 5% 4 6% 9% 42%	1980
September	1st to 10th	Night	14% 6% 2 6% 4 4 3 3 5% 6% 46%	1800
	11th to 20th	Night	12% 5% 3 4 4 3 3 3 5% 7% 53%	1800
	21st to end	Night	17% 6% 2 6% 4 3 5% 3 5% 6% 42%	2050
October	1st to 10th	Night	19% 7% 2 5% 4 3 3 2 5% 6% 43%	2160
	11th to 20th	Night	16% 7% 2 5% 4 4 4 3 5% 7% 44%	2160
	21st to end	Night	19% 7% 2 6% 3 4 4 4 5% 7% 40%	2376
November	1st to 10th	Night	11% 6% 2 5% 4 4 3 3 6% 6% 50%	2391
	11th to 20th	Night	15% 9% 3 6% 5% 3 3 3 5% 6% 42%	2522
	21st to end	Night	16% 7% 2 6% 5% 4 5% 4 5% 8% 38%	2660
December	1st to 10th	Night	18% 11% 2 7% 5% 4 5% 4 6% 6% 32%	2660
	11th to 20th	Night	18% 8% 3 7% 5% 5% 5% 4 5% 5% 35%	3288
	21st to end	Night	18% 10% 3 9% 6% 5% 5% 4 6% 7% 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	46% 6% 15% 23% 8% 3	2518
	11th to 20th	Day	58% 6% 12% 12% 10% 2	2722
	21st to end	Day	57% 7% 11% 18% 6% 1	3124
February	1st to 10th	Day	50% 7% 12% 20% 10% 1	1710
	11th to 20th	Day	47% 6% 12% 23% 11% 2	1718
	21st to end	Day	52% 4 11% 20% 9% 3	1570
March	1st to 10th	Day	49% 7% 10% 24% 8% 2	3300
	11th to 20th	Day	38% 6% 15% 25% 13% 3	3480
	21st to end	Day	46% 5% 9% 21% 17% 2	3928
April	1st to 10th	Day	48% 6% 10% 19% 13% 4	2280
	11th to 20th	Day	43% 6% 11% 21% 15% 4	2254
	21st to end	Day	43% 6% 11% 22% 15% 4	2280
May	1st to 10th	Day	53% 6% 8% 20% 10% 2	4142
	11th to 20th	Day	54% 9% 12% 16% 8% 2	4402
	21st to end	Day	35% 8% 13% 25% 16% 2	4837
June	1st to 10th	Day	41% 8% 12% 22% 15% 1	2660
	11th to 20th	Day	42% 8% 14% 22% 12% 2	2660
	21st to end	Day	36% 9% 14% 26% 15% 1	2660
July	1st to 10th	Day	41% 8% 12% 21% 15% 2	2590
	11th to 20th	Day	34% 8% 15% 25% 16% 2	2585
	21st to end	Day	43% 8% 11% 19% 17% 2	2590
August	1st to 10th	Day	39% 11% 15% 22% 13%	2314
	11th to 20th	Day	41% 8% 13% 22% 14% 1	2221
	21st to end	Day	38% 8% 12% 22% 17% 3	2376
September	1st to 10th	Day	40% 6% 12% 21% 17% 3	2160
	11th to 20th	Day	34% 6% 11% 24% 22% 4	2160
	21st to end	Day	45% 6% 9% 18% 20% 2	1905
October	1st to 10th	Day	40% 8% 13% 23% 15% 1	1800
	11th to 20th	Day	42% 6% 11% 24% 16% 1	1800
	21st to end	Day	44% 7% 10% 24% 14% 2	1980
November	1st to 10th	Day	36% 5% 15% 23% 18% 3	1685
	11th to 20th	Day	42% 5% 13% 22% 15% 3	1654
	21st to end	Day	44% 7% 12% 27% 8% 1	1520
December	1st to 10th	Day	53% 6% 14% 17% 9% 1	1520
	11th to 20th	Day	49% 6% 15% 24% 7% 1	1906
	21st to end	Day	54% 9% 16% 14% 6%	2772
January	1st to 10th	Night	45% 8% 15% 22% 8% 2	4429
	11th to 20th	Night	51% 6% 15% 18% 9% 1	4234
	21st to end	Night	53% 6% 10% 21% 8% 1	4532
February	1st to 10th	Night	47% 7% 13% 23% 9% 1	2470
	11th to 20th	Night	48% 5% 13% 19% 15% 1	2358
	21st to end	Night	49% 5% 11% 19% 14% 3	1884
March	1st to 10th	Night	50% 6% 10% 22% 11% 1	3552
	11th to 20th	Night	38% 7% 15% 28% 12% 2	3480
	21st to end	Night	42% 5% 8% 20% 21% 4	3702
April	1st to 10th	Night	48% 5% 11% 19% 14% 3	1900
	11th to 20th	Night	41% 7% 11% 20% 18% 2	1875
	21st to end	Night	41% 6% 11% 21% 17% 4	1900
May	1st to 10th	Night	54% 7% 8% 19% 10% 2	2829
	11th to 20th	Night	53% 10% 13% 12% 10% 1	2496
	21st to end	Night	39% 9% 13% 22% 13% 5%	2739
June	1st to 10th	Night	37% 8% 12% 22% 20% 2	1520
	11th to 20th	Night	38% 8% 13% 23% 16% 2	1520
	21st to end	Night	36% 8% 15% 26% 15% 1	1520
July	1st to 10th	Night	42% 9% 14% 17% 14% 4	1480
	11th to 20th	Night	33% 9% 15% 25% 17% 2	1472
	21st to end	Night	36% 9% 16% 21% 16% 2	1714
August	1st to 10th	Night	36% 8% 15% 25% 15% 1	1600
	11th to 20th	Night	42% 10% 12% 18% 17% 1	1660
	21st to end	Night	36% 9% 13% 20% 18% 3	1980
September	1st to 10th	Night	39% 7% 11% 21% 19% 3	1800
	11th to 20th	Night	32% 6% 10% 27% 22% 3	1800
	21st to end	Night	42% 5% 10% 20% 22% 2	2050
October	1st to 10th	Night	43% 5% 10% 24% 15% 2	2160
	11th to 20th	Night	40% 6% 11% 27% 15% 2	2160
	21st to end	Night	41% 6% 11% 25% 15% 1	2376
November	1st to 10th	Night	34% 6% 12% 25% 19% 4	2391
	11th to 20th	Night	42% 5% 10% 23% 16% 4	2522
	21st to end	Night	42% 7% 13% 26% 11% 2	2660
December	1st to 10th	Night	50% 6% 13% 19% 12%	2660
	11th to 20th	Night	47% 6% 14% 21% 11% 1	3288
	21st to end	Night	51% 7% 16% 19% 6%	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	36% 22% 28% 10% 4	180
	11th to 20th	Day	43% 18% 30% 8% 1	239
	21st to end	Day	29% 28% 30% 10% 3	297
February	1st to 10th	Day	32% 26% 32% 7% 2	270
	11th to 20th	Day	36% 26% 31% 6% 1	316
	21st to end	Day	36% 19% 29% 14% 3	382
March	1st to 10th	Day	34% 18% 28% 16% 4	460
	11th to 20th	Day	31% 25% 27% 13% 3 1	460
	21st to end	Day	30% 24% 27% 13% 5% 2	506
April	1st to 10th	Day	31% 20% 27% 15% 5% 1	460
	11th to 20th	Day	25% 23% 25% 16% 8% 3	452
	21st to end	Day	28% 17% 35% 12% 6% 3	460
May	1st to 10th	Day	33% 16% 28% 14% 7% 2	463
	11th to 20th	Day	27% 14% 28% 20% 9% 2	487
	21st to end	Day	18% 10% 29% 24% 15% 5%	529
June	1st to 10th	Day	20% 13% 26% 25% 13% 3	490
	11th to 20th	Day	19% 10% 28% 27% 13% 3	490
	21st to end	Day	14% 12% 32% 27% 13% 3	490
July	1st to 10th	Day	13% 6% 25% 27% 22% 7%	485
	11th to 20th	Day	8% 5% 29% 33% 21% 5%	484
	21st to end	Day	13% 5% 27% 32% 17% 5%	529
August	1st to 10th	Day	12% 6% 24% 28% 22% 8%	446
	11th to 20th	Day	12% 5% 22% 33% 20% 8%	439
	21st to end	Day	14% 5% 28% 28% 13% 12%	495
September	1st to 10th	Day	19% 8% 22% 23% 18% 11%	450
	11th to 20th	Day	13% 7% 25% 27% 19% 8%	450
	21st to end	Day	27% 10% 23% 20% 14% 5%	450
October	1st to 10th	Day	24% 7% 23% 23% 17% 7%	450
	11th to 20th	Day	22% 14% 29% 24% 10% 2	450
	21st to end	Day	24% 16% 31% 20% 8% 1	495
November	1st to 10th	Day	21% 16% 25% 25% 11% 2	372
	11th to 20th	Day	29% 17% 28% 17% 9% 1	314
	21st to end	Day	27% 21% 36% 12% 4 1	180
December	1st to 10th	Day	34% 22% 29% 10% 4 1	180
	11th to 20th	Day	37% 20% 33% 7% 3	180
	21st to end	Day	32% 20% 32% 13% 3	198
January	1st to 10th	Night	24% 21% 33% 19% 3	760
	11th to 20th	Night	27% 17% 30% 23% 3	760
	21st to end	Night	21% 22% 33% 22% 2	836
February	1st to 10th	Night	25% 19% 30% 24% 2	760
	11th to 20th	Night	26% 24% 33% 16% 1	743
	21st to end	Night	29% 22% 29% 17% 3	628
March	1st to 10th	Night	25% 19% 32% 20% 4	760
	11th to 20th	Night	27% 19% 30% 19% 5% 1	760
	21st to end	Night	23% 20% 32% 18% 6%	836
April	1st to 10th	Night	25% 19% 31% 20% 5%	760
	11th to 20th	Night	20% 15% 35% 23% 7% 1	751
	21st to end	Night	22% 14% 28% 29% 6% 1	760
May	1st to 10th	Night	26% 9% 27% 26% 12%	572
	11th to 20th	Night	20% 6% 31% 32% 11%	374
	21st to end	Night	14% 8% 21% 39% 17% 1	411
June	1st to 10th	Night	16% 6% 23% 35% 20%	380
	11th to 20th	Night	15% 4 24% 41% 15% 1	380
	21st to end	Night	12% 4 24% 45% 14% 1	380
July	1st to 10th	Night	14% 3 19% 41% 20% 3	370
	11th to 20th	Night	10% 2 14% 44% 28% 2	368
	21st to end	Night	12% 3 19% 39% 25% 2	563
August	1st to 10th	Night	15% 2 11% 43% 28% 1	537
	11th to 20th	Night	15% 4 11% 36% 30% 4	596
	21st to end	Night	13% 4 18% 35% 28% 3	792
September	1st to 10th	Night	17% 3 20% 35% 22% 3	720
	11th to 20th	Night	13% 5% 19% 34% 24% 5%	720
	21st to end	Night	20% 7% 20% 31% 20% 2	720
October	1st to 10th	Night	23% 7% 20% 29% 19% 3	720
	11th to 20th	Night	19% 12% 26% 32% 12% 1	720
	21st to end	Night	24% 13% 27% 28% 8% 1	792
November	1st to 10th	Night	16% 12% 30% 31% 11% 1	740
	11th to 20th	Night	21% 19% 27% 24% 7% 1	760
	21st to end	Night	22% 16% 30% 24% 7%	760
December	1st to 10th	Night	26% 18% 30% 21% 4	760
	11th to 20th	Night	22% 17% 31% 26% 3	760
	21st to end	Night	24% 20% 27% 27% 2	836

Page generated at 2024-07-28 09:52:09. Version ac07

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