Wyalusing
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Wyalusing clear sky chart from 2005-11-06 to 2024-01-13.

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	14% 9% 4 6% 6% 3 4 5% 5% 7% 37%	74753
	Night	13% 8% 4 7% 5% 3 4 4 5% 7% 40%	74999
Transparency	Day	46% 7% 13% 22% 11% 1	74453
	Night	45% 6% 12% 22% 13% 2	74819
Seeing	Day	17% 11% 29% 26% 13% 4	14727
	Night	17% 10% 31% 30% 11% 1	24720

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	10% 11% 7% 9% 6% 5% 5% 7% 4 7% 29%	1517
	11th to 20th	Day	12% 15% 7% 10% 7% 4 4 4 5% 7% 25%	1456
	21st to end	Day	14% 15% 6% 11% 7% 3 6% 4 5% 7% 23%	1760
February	1st to 10th	Day	11% 12% 6% 8% 7% 4 5% 5% 6% 6% 30%	1620
	11th to 20th	Day	15% 10% 4 7% 5% 3 5% 5% 6% 6% 34%	1606
	21st to end	Day	14% 12% 4 9% 7% 3 3 4 4 6% 34%	1480
March	1st to 10th	Day	15% 9% 5% 7% 7% 3 4 4 5% 6% 35%	1836
	11th to 20th	Day	13% 9% 4 7% 5% 4 5% 4 4 7% 39%	1980
	21st to end	Day	21% 10% 4 8% 5% 3 4 4 4 7% 29%	2274
April	1st to 10th	Day	20% 11% 4 6% 6% 3 4 4 5% 6% 32%	2160
	11th to 20th	Day	17% 12% 4 6% 5% 3 4 4 5% 6% 33%	2134
	21st to end	Day	21% 10% 3 6% 5% 3 4 5% 4 6% 33%	2164
May	1st to 10th	Day	16% 8% 3 7% 7% 5% 6% 5% 6% 8% 29%	2487
	11th to 20th	Day	18% 7% 3 7% 7% 3 5% 4 5% 7% 34%	2479
	21st to end	Day	17% 6% 3 6% 6% 3 5% 4 5% 7% 37%	2725
June	1st to 10th	Day	11% 5% 2 5% 5% 3 5% 5% 5% 9% 46%	2520
	11th to 20th	Day	11% 5% 3 5% 6% 3 5% 5% 5% 8% 44%	2520
	21st to end	Day	11% 6% 3 6% 6% 4 5% 5% 5% 9% 39%	2520
July	1st to 10th	Day	8% 5% 2 4 5% 3 5% 5% 7% 9% 48%	2520
	11th to 20th	Day	7% 4 2 5% 5% 3 5% 6% 6% 9% 47%	2520
	21st to end	Day	7% 4 2 5% 5% 3 5% 6% 7% 10% 45%	2743
August	1st to 10th	Day	6% 6% 2 5% 6% 4 5% 7% 8% 10% 42%	2351
	11th to 20th	Day	13% 6% 2 6% 5% 3 4 5% 6% 7% 45%	2257
	21st to end	Day	11% 5% 2 5% 5% 3 5% 4 5% 8% 47%	2376
September	1st to 10th	Day	16% 5% 2 4 5% 3 5% 4 4 8% 45%	2160
	11th to 20th	Day	12% 6% 2 6% 5% 2 4 4 5% 8% 47%	2160
	21st to end	Day	14% 6% 2 4 5% 3 4 5% 6% 6% 45%	1919
October	1st to 10th	Day	16% 6% 2 6% 5% 2 3 3 5% 7% 45%	1800
	11th to 20th	Day	19% 9% 3 6% 5% 3 4 4 4 6% 38%	1800
	21st to end	Day	18% 11% 4 4 5% 2 4 3 4 6% 40%	1900
November	1st to 10th	Day	11% 8% 2 6% 6% 2 4 5% 6% 6% 44%	1672
	11th to 20th	Day	15% 11% 4 8% 5% 3 4 5% 4 6% 33%	1596
	21st to end	Day	14% 12% 4 6% 5% 2 3 2 5% 7% 39%	1520
December	1st to 10th	Day	14% 13% 5% 10% 7% 3 4 5% 5% 7% 30%	1520
	11th to 20th	Day	14% 11% 6% 8% 6% 3 5% 5% 6% 7% 28%	1918
	21st to end	Day	20% 21% 9% 11% 5% 3 3 3 3 5% 18%	2783
January	1st to 10th	Night	10% 10% 5% 9% 7% 4 5% 5% 4 6% 34%	2648
	11th to 20th	Night	13% 13% 6% 12% 7% 3 4 4 4 6% 28%	2549
	21st to end	Night	15% 12% 6% 10% 7% 3 5% 4 4 7% 27%	2592
February	1st to 10th	Night	10% 13% 7% 9% 6% 3 5% 5% 4 5% 32%	2340
	11th to 20th	Night	11% 9% 4 8% 7% 4 4 4 4 6% 40%	2240
	21st to end	Night	15% 10% 4 8% 5% 3 4 4 4 5% 36%	1776
March	1st to 10th	Night	17% 10% 5% 6% 4 3 3 4 5% 6% 38%	2141
	11th to 20th	Night	14% 7% 3 7% 5% 3 4 4 5% 8% 41%	1980
	21st to end	Night	20% 10% 4 6% 5% 3 5% 4 5% 5% 31%	2081
April	1st to 10th	Night	15% 10% 4 6% 6% 3 3 4 6% 5% 38%	1800
	11th to 20th	Night	19% 8% 3 5% 5% 3 4 5% 5% 6% 38%	1775
	21st to end	Night	19% 7% 3 6% 5% 3 4 5% 5% 7% 37%	1792
May	1st to 10th	Night	17% 7% 3 5% 5% 2 4 5% 6% 7% 38%	1472
	11th to 20th	Night	17% 7% 3 6% 5% 3 3 4 5% 8% 40%	1416
	21st to end	Night	12% 6% 3 5% 4 3 4 5% 5% 8% 47%	1551
June	1st to 10th	Night	10% 5% 2 5% 6% 3 4 4 5% 8% 47%	1440
	11th to 20th	Night	10% 5% 2 6% 5% 3 4 4 6% 9% 46%	1440
	21st to end	Night	10% 5% 1 4 5% 3 5% 4 6% 8% 50%	1440
July	1st to 10th	Night	5% 4 1 4 3 3 3 5% 5% 11% 56%	1440
	11th to 20th	Night	6% 3 2 4 4 3 3 4 6% 10% 55%	1440
	21st to end	Night	6% 2 2 4 3 2 5% 5% 7% 9% 55%	1575
August	1st to 10th	Night	5% 4 2 3 4 4 5% 5% 7% 10% 52%	1584
	11th to 20th	Night	9% 3 2 6% 5% 3 4 4 5% 9% 51%	1643
	21st to end	Night	9% 4 3 4 3 3 3 4 5% 7% 53%	1980
September	1st to 10th	Night	11% 5% 2 4 4 3 4 4 4 7% 53%	1800
	11th to 20th	Night	13% 4 1 4 4 2 4 4 5% 7% 53%	1800
	21st to end	Night	11% 4 2 4 5% 2 4 4 4 7% 53%	2020
October	1st to 10th	Night	12% 6% 2 4 4 2 4 4 4 6% 51%	2160
	11th to 20th	Night	17% 6% 3 5% 5% 3 5% 4 5% 7% 42%	2160
	21st to end	Night	17% 10% 3 6% 4 2 4 4 5% 6% 38%	2456
November	1st to 10th	Night	12% 7% 3 5% 4 3 4 4 5% 5% 48%	2406
	11th to 20th	Night	15% 11% 6% 7% 6% 3 4 4 4 5% 35%	2579
	21st to end	Night	16% 10% 4 6% 5% 3 4 4 4 6% 38%	2660
December	1st to 10th	Night	13% 12% 5% 9% 6% 4 4 5% 5% 6% 30%	2660
	11th to 20th	Night	14% 12% 5% 9% 5% 3 5% 5% 6% 6% 29%	3279
	21st to end	Night	21% 15% 6% 12% 7% 3 5% 4 4 4 20%	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	54% 7% 14% 15% 9%	1518
	11th to 20th	Day	61% 5% 12% 16% 6%	1456
	21st to end	Day	61% 6% 14% 12% 7% 1	1760
February	1st to 10th	Day	54% 6% 13% 18% 8% 1	1620
	11th to 20th	Day	49% 7% 11% 23% 9% 1	1615
	21st to end	Day	53% 6% 9% 19% 10% 2	1480
March	1st to 10th	Day	50% 6% 14% 21% 8% 1	1836
	11th to 20th	Day	46% 5% 13% 24% 11% 1	1980
	21st to end	Day	55% 6% 11% 20% 7% 1	2274
April	1st to 10th	Day	53% 6% 11% 21% 9% 1	2160
	11th to 20th	Day	52% 5% 9% 21% 11% 2	2134
	21st to end	Day	51% 7% 11% 19% 11% 1	2164
May	1st to 10th	Day	51% 8% 13% 20% 8% 1	2487
	11th to 20th	Day	50% 6% 13% 20% 10% 1	2483
	21st to end	Day	46% 7% 10% 21% 13% 2	2725
June	1st to 10th	Day	35% 8% 14% 27% 15% 1	2520
	11th to 20th	Day	38% 7% 13% 23% 18% 1	2520
	21st to end	Day	40% 9% 13% 24% 13% 2	2520
July	1st to 10th	Day	31% 9% 15% 31% 12% 2	2451
	11th to 20th	Day	33% 10% 16% 24% 15% 2	2445
	21st to end	Day	32% 9% 16% 27% 14% 2	2591
August	1st to 10th	Day	34% 10% 15% 28% 11% 2	2336
	11th to 20th	Day	37% 8% 13% 27% 13% 2	2257
	21st to end	Day	34% 7% 13% 28% 16% 2	2376
September	1st to 10th	Day	37% 7% 13% 24% 17% 2	2160
	11th to 20th	Day	35% 7% 12% 31% 14% 1	2160
	21st to end	Day	39% 6% 11% 28% 14% 1	1919
October	1st to 10th	Day	40% 6% 12% 28% 14%	1800
	11th to 20th	Day	47% 5% 13% 22% 12% 1	1800
	21st to end	Day	46% 5% 13% 22% 13% 1	1900
November	1st to 10th	Day	41% 5% 14% 24% 13% 3	1672
	11th to 20th	Day	52% 6% 12% 20% 9% 1	1596
	21st to end	Day	47% 5% 17% 24% 7%	1520
December	1st to 10th	Day	55% 6% 14% 16% 8% 2	1520
	11th to 20th	Day	53% 7% 17% 14% 8% 1	1915
	21st to end	Day	71% 4 10% 11% 4	2783
January	1st to 10th	Night	51% 6% 13% 19% 12% 1	2648
	11th to 20th	Night	57% 6% 14% 15% 7%	2549
	21st to end	Night	59% 5% 11% 16% 8% 1	2592
February	1st to 10th	Night	54% 5% 11% 18% 10% 1	2340
	11th to 20th	Night	46% 5% 12% 22% 12% 2	2241
	21st to end	Night	48% 6% 12% 20% 11% 2	1776
March	1st to 10th	Night	48% 6% 14% 23% 8% 1	2141
	11th to 20th	Night	43% 6% 14% 22% 14% 2	1980
	21st to end	Night	54% 5% 12% 19% 9% 1	2081
April	1st to 10th	Night	46% 6% 11% 22% 14% 2	1800
	11th to 20th	Night	47% 6% 9% 21% 14% 3	1775
	21st to end	Night	46% 7% 11% 19% 14% 3	1792
May	1st to 10th	Night	45% 7% 13% 21% 13% 1	1472
	11th to 20th	Night	43% 7% 12% 24% 13% 1	1417
	21st to end	Night	35% 9% 12% 25% 17% 2	1552
June	1st to 10th	Night	35% 7% 14% 26% 17% 2	1440
	11th to 20th	Night	35% 6% 12% 23% 21% 3	1440
	21st to end	Night	32% 8% 15% 25% 16% 4	1440
July	1st to 10th	Night	24% 8% 14% 32% 18% 3	1400
	11th to 20th	Night	25% 8% 15% 30% 19% 3	1392
	21st to end	Night	23% 8% 20% 28% 17% 4	1487
August	1st to 10th	Night	27% 8% 17% 30% 17% 2	1575
	11th to 20th	Night	31% 7% 15% 28% 17% 2	1643
	21st to end	Night	29% 8% 12% 28% 18% 5%	1980
September	1st to 10th	Night	32% 7% 10% 26% 24% 1	1800
	11th to 20th	Night	31% 6% 11% 33% 18% 2	1800
	21st to end	Night	31% 7% 11% 29% 21% 1	2020
October	1st to 10th	Night	34% 6% 11% 28% 20% 2	2160
	11th to 20th	Night	41% 6% 12% 21% 19% 1	2160
	21st to end	Night	46% 6% 12% 21% 14% 1	2456
November	1st to 10th	Night	38% 5% 14% 23% 17% 3	2406
	11th to 20th	Night	52% 6% 12% 18% 10% 1	2579
	21st to end	Night	48% 5% 13% 25% 8% 1	2660
December	1st to 10th	Night	54% 6% 13% 19% 7% 1	2660
	11th to 20th	Night	54% 6% 14% 18% 7% 1	3281
	21st to end	Night	68% 6% 9% 13% 4	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	18% 14% 33% 23% 10% 2	270
	11th to 20th	Day	20% 15% 42% 17% 6%	246
	21st to end	Day	22% 16% 36% 23% 3	264
February	1st to 10th	Day	17% 20% 45% 15% 3 1	240
	11th to 20th	Day	23% 21% 31% 18% 5% 1	240
	21st to end	Day	24% 18% 38% 17% 3	198
March	1st to 10th	Day	15% 21% 40% 17% 6%	240
	11th to 20th	Day	18% 15% 39% 20% 7% 1	240
	21st to end	Day	29% 14% 32% 19% 6% 1	360
April	1st to 10th	Day	29% 14% 34% 17% 5%	420
	11th to 20th	Day	22% 20% 25% 23% 8% 1	412
	21st to end	Day	23% 14% 30% 20% 11% 2	424
May	1st to 10th	Day	20% 14% 33% 24% 8% 1	603
	11th to 20th	Day	22% 15% 27% 24% 8% 3	625
	21st to end	Day	20% 9% 26% 25% 15% 5%	679
June	1st to 10th	Day	10% 7% 28% 35% 17% 4	630
	11th to 20th	Day	16% 8% 28% 32% 14% 3	630
	21st to end	Day	13% 8% 31% 29% 15% 4	630
July	1st to 10th	Day	8% 5% 20% 31% 22% 14%	621
	11th to 20th	Day	10% 4 28% 32% 19% 7%	618
	21st to end	Day	7% 4 26% 36% 21% 6%	684
August	1st to 10th	Day	8% 2 23% 34% 23% 11%	626
	11th to 20th	Day	15% 7% 15% 28% 24% 11%	571
	21st to end	Day	10% 6% 25% 30% 20% 9%	495
September	1st to 10th	Day	17% 9% 21% 29% 19% 5%	450
	11th to 20th	Day	14% 5% 21% 34% 20% 6%	450
	21st to end	Day	19% 11% 28% 25% 16% 2	377
October	1st to 10th	Day	20% 9% 29% 26% 13% 2	270
	11th to 20th	Day	27% 17% 31% 18% 7%	270
	21st to end	Day	28% 14% 31% 18% 6% 2	297
November	1st to 10th	Day	16% 14% 39% 20% 9% 2	270
	11th to 20th	Day	18% 21% 33% 21% 7% 1	270
	21st to end	Day	23% 14% 38% 20% 6%	270
December	1st to 10th	Day	16% 19% 38% 19% 7% 1	270
	11th to 20th	Day	19% 13% 37% 20% 9% 1	270
	21st to end	Day	29% 12% 43% 14% 2	297
January	1st to 10th	Night	13% 15% 38% 26% 8%	950
	11th to 20th	Night	19% 11% 36% 28% 5%	911
	21st to end	Night	20% 12% 36% 27% 5%	990
February	1st to 10th	Night	18% 13% 39% 25% 5%	900
	11th to 20th	Night	16% 15% 39% 23% 6%	846
	21st to end	Night	22% 13% 38% 23% 4 1	592
March	1st to 10th	Night	22% 13% 34% 23% 7%	701
	11th to 20th	Night	17% 11% 34% 30% 8% 1	540
	21st to end	Night	23% 10% 32% 28% 5% 1	594
April	1st to 10th	Night	19% 14% 37% 25% 5%	540
	11th to 20th	Night	23% 12% 30% 29% 6%	533
	21st to end	Night	22% 9% 32% 28% 8% 1	540
May	1st to 10th	Night	20% 8% 33% 30% 7% 1	540
	11th to 20th	Night	18% 8% 31% 35% 8% 1	531
	21st to end	Night	15% 5% 29% 34% 16% 1	584
June	1st to 10th	Night	12% 4 27% 44% 12% 1	540
	11th to 20th	Night	12% 3 29% 43% 12% 1	540
	21st to end	Night	11% 4 27% 41% 15% 1	540
July	1st to 10th	Night	5% 2 17% 40% 32% 3	525
	11th to 20th	Night	7% 3 21% 44% 21% 4	522
	21st to end	Night	7% 2 16% 48% 25% 2	591
August	1st to 10th	Night	7% 3 16% 46% 28% 1	537
	11th to 20th	Night	10% 2 15% 40% 26% 6%	534
	21st to end	Night	11% 2 18% 42% 23% 3	594
September	1st to 10th	Night	13% 5% 21% 36% 19% 6%	540
	11th to 20th	Night	14% 3 21% 34% 24% 3	540
	21st to end	Night	12% 9% 28% 33% 17% 1	689
October	1st to 10th	Night	15% 7% 28% 32% 16% 2	720
	11th to 20th	Night	19% 12% 33% 28% 9%	720
	21st to end	Night	21% 13% 29% 30% 7%	792
November	1st to 10th	Night	17% 10% 38% 25% 9% 1	740
	11th to 20th	Night	19% 14% 41% 20% 6%	869
	21st to end	Night	22% 12% 35% 24% 7%	950
December	1st to 10th	Night	17% 14% 39% 24% 5% 1	950
	11th to 20th	Night	22% 11% 35% 25% 6%	950
	21st to end	Night	27% 13% 33% 23% 3	1045

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