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 2024-11-10.

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	13% 9% 3 8% 5% 4 4 4 5% 7% 38%	101598
	Night	13% 9% 4 8% 5% 4 4 3 5% 6% 39%	97623
Transparency	Day	44% 7% 12% 24% 12% 1	105168
	Night	44% 6% 12% 23% 14% 2	102193
Seeing	Day	17% 11% 29% 26% 13% 4	15927
	Night	17% 10% 31% 31% 11% 1	25770

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	9% 15% 9% 17% 5% 5% 4 4 3 5% 25%	2527
	11th to 20th	Day	10% 12% 4 12% 9% 6% 5% 8% 7% 6% 21%	2530
	21st to end	Day	16% 21% 7% 11% 5% 3 4 2 4 6% 20%	3085
February	1st to 10th	Day	11% 12% 5% 9% 6% 5% 5% 4 6% 6% 30%	1710
	11th to 20th	Day	14% 11% 4 7% 4 4 5% 3 7% 6% 35%	1697
	21st to end	Day	12% 13% 4 11% 5% 4 3 3 5% 6% 35%	1570
March	1st to 10th	Day	15% 8% 3 6% 4 3 4 2 4 5% 46%	3184
	11th to 20th	Day	11% 7% 2 8% 4 5% 4 3 5% 6% 43%	3480
	21st to end	Day	23% 13% 4 12% 5% 4 4 3 4 5% 24%	3993
April	1st to 10th	Day	20% 12% 3 6% 5% 4 4 3 5% 6% 32%	2280
	11th to 20th	Day	17% 12% 4 7% 5% 5% 4 3 5% 6% 34%	2254
	21st to end	Day	21% 10% 3 7% 4 4 5% 3 5% 6% 33%	2285
May	1st to 10th	Day	18% 8% 2 7% 5% 5% 5% 4 6% 7% 34%	4352
	11th to 20th	Day	15% 7% 3 6% 4 4 4 3 5% 7% 41%	4399
	21st to end	Day	17% 7% 2 6% 5% 4 4 4 5% 7% 39%	4824
June	1st to 10th	Day	11% 5% 2 6% 4 4 5% 4 6% 8% 45%	2660
	11th to 20th	Day	12% 6% 3 6% 5% 5% 4 4 6% 8% 43%	2660
	21st to end	Day	12% 6% 3 7% 5% 5% 5% 5% 6% 8% 39%	2660
July	1st to 10th	Day	10% 7% 3 7% 5% 5% 6% 5% 7% 9% 36%	4440
	11th to 20th	Day	5% 4 2 5% 3 5% 5% 4 6% 9% 52%	4440
	21st to end	Day	7% 6% 3 7% 5% 5% 6% 5% 7% 9% 41%	4813
August	1st to 10th	Day	8% 7% 3 7% 5% 5% 5% 5% 7% 9% 40%	4141
	11th to 20th	Day	12% 5% 2 6% 4 4 4 4 6% 7% 46%	3955
	21st to end	Day	9% 5% 2 6% 4 4 5% 3 6% 9% 48%	4180
September	1st to 10th	Day	15% 5% 2 5% 4 4 4 3 5% 7% 46%	2280
	11th to 20th	Day	12% 6% 2 6% 4 3 4 4 5% 8% 47%	2280
	21st to end	Day	14% 6% 2 5% 4 4 4 3 6% 6% 45%	2024
October	1st to 10th	Day	15% 6% 2 6% 4 3 3 2 5% 7% 47%	1900
	11th to 20th	Day	18% 9% 2 6% 4 4 4 4 4 6% 39%	1900
	21st to end	Day	17% 11% 3 5% 4 4 3 3 4 6% 40%	2005
November	1st to 10th	Day	11% 9% 2 8% 5% 3 4 4 6% 6% 43%	1753
	11th to 20th	Day	15% 13% 4 9% 4 4 4 3 5% 6% 33%	1596
	21st to end	Day	13% 13% 3 7% 4 3 3 2 6% 7% 39%	1520
December	1st to 10th	Day	14% 13% 5% 10% 6% 4 4 4 5% 6% 30%	1520
	11th to 20th	Day	14% 12% 5% 9% 5% 5% 5% 4 6% 7% 28%	1918
	21st to end	Day	20% 22% 8% 12% 4 4 3 2 3 5% 18%	2783
January	1st to 10th	Night	10% 13% 8% 14% 6% 5% 4 3 4 6% 27%	4428
	11th to 20th	Night	11% 16% 6% 13% 6% 4 5% 4 8% 5% 22%	4440
	21st to end	Night	16% 17% 8% 10% 7% 4 4 3 4 5% 23%	4564
February	1st to 10th	Night	9% 14% 6% 10% 6% 4 6% 4 4 5% 33%	2470
	11th to 20th	Night	11% 10% 3 9% 6% 4 4 3 4 6% 41%	2368
	21st to end	Night	14% 10% 4 8% 4 4 4 3 5% 5% 37%	1884
March	1st to 10th	Night	15% 10% 4 6% 4 3 3 3 5% 5% 43%	3686
	11th to 20th	Night	11% 7% 2 6% 4 4 4 3 5% 7% 47%	3480
	21st to end	Night	26% 12% 4 10% 4 4 3 3 4 4 27%	3637
April	1st to 10th	Night	15% 12% 3 7% 5% 3 3 3 6% 5% 38%	1900
	11th to 20th	Night	19% 8% 3 5% 4 4 4 4 5% 6% 39%	1875
	21st to end	Night	19% 8% 3 7% 4 4 4 4 5% 7% 37%	1891
May	1st to 10th	Night	17% 7% 2 7% 4 4 4 3 6% 7% 38%	2552
	11th to 20th	Night	13% 7% 3 6% 5% 4 3 4 5% 6% 45%	2506
	21st to end	Night	11% 5% 2 5% 4 4 4 4 6% 7% 47%	2743
June	1st to 10th	Night	10% 6% 2 5% 5% 4 4 4 6% 7% 47%	1520
	11th to 20th	Night	10% 5% 2 6% 4 4 4 4 6% 9% 45%	1520
	21st to end	Night	10% 6% 1 5% 5% 4 5% 3 7% 7% 48%	1520
July	1st to 10th	Night	10% 8% 2 6% 4 4 3 4 6% 9% 43%	2530
	11th to 20th	Night	4 2 2 4 3 4 4 4 6% 10% 56%	2530
	21st to end	Night	5% 4 2 6% 4 5% 5% 4 7% 8% 51%	2750
August	1st to 10th	Night	9% 5% 2 5% 4 4 5% 4 5% 8% 50%	2795
	11th to 20th	Night	9% 4 2 6% 4 4 4 3 4 8% 52%	2880
	21st to end	Night	10% 6% 2 5% 3 3 4 3 6% 7% 51%	3476
September	1st to 10th	Night	10% 5% 2 4 3 3 4 3 4 7% 54%	1900
	11th to 20th	Night	13% 4 1 4 3 3 4 3 5% 6% 53%	1900
	21st to end	Night	11% 5% 2 5% 4 3 4 3 4 7% 53%	2133
October	1st to 10th	Night	11% 7% 2 4 3 3 3 3 4 6% 52%	2280
	11th to 20th	Night	16% 7% 3 6% 4 4 4 3 5% 7% 44%	2280
	21st to end	Night	17% 10% 3 6% 4 3 4 3 5% 6% 38%	2593
November	1st to 10th	Night	13% 7% 3 6% 3 4 3 3 5% 5% 47%	2530
	11th to 20th	Night	14% 12% 5% 8% 6% 4 4 3 5% 5% 34%	2579
	21st to end	Night	16% 10% 3 7% 5% 3 3 3 5% 6% 38%	2660
December	1st to 10th	Night	13% 13% 5% 10% 6% 5% 4 4 5% 6% 30%	2660
	11th to 20th	Night	14% 13% 4 10% 5% 5% 5% 4 6% 5% 29%	3279
	21st to end	Night	20% 16% 6% 13% 6% 5% 4 3 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	63% 6% 13% 13% 5%	2528
	11th to 20th	Day	57% 8% 13% 14% 7%	2530
	21st to end	Day	66% 6% 13% 12% 4	3085
February	1st to 10th	Day	52% 6% 13% 18% 10% 1	1710
	11th to 20th	Day	47% 7% 10% 26% 9% 1	1706
	21st to end	Day	52% 6% 10% 20% 10% 2	1570
March	1st to 10th	Day	40% 6% 11% 26% 14% 3	3184
	11th to 20th	Day	39% 5% 11% 33% 11% 1	3480
	21st to end	Day	61% 8% 11% 13% 6% 1	3993
April	1st to 10th	Day	52% 6% 11% 22% 9%	2280
	11th to 20th	Day	52% 5% 9% 21% 11% 2	2254
	21st to end	Day	50% 7% 11% 19% 12% 1	2285
May	1st to 10th	Day	46% 7% 11% 21% 15% 1	4393
	11th to 20th	Day	41% 7% 11% 31% 10% 1	4403
	21st to end	Day	43% 8% 9% 24% 14% 2	4837
June	1st to 10th	Day	35% 8% 14% 26% 16% 1	2660
	11th to 20th	Day	39% 7% 12% 23% 18% 1	2660
	21st to end	Day	40% 9% 12% 24% 12% 2	2660
July	1st to 10th	Day	42% 8% 15% 27% 7% 1	4371
	11th to 20th	Day	28% 8% 15% 30% 18% 1	4365
	21st to end	Day	37% 9% 14% 20% 18% 2	4662
August	1st to 10th	Day	39% 8% 14% 25% 13% 1	4126
	11th to 20th	Day	36% 7% 12% 31% 13% 1	3994
	21st to end	Day	33% 6% 15% 31% 14% 1	4179
September	1st to 10th	Day	36% 7% 13% 24% 18% 2	2280
	11th to 20th	Day	36% 6% 12% 31% 15% 1	2280
	21st to end	Day	38% 6% 11% 29% 15% 1	2024
October	1st to 10th	Day	24% 4 7% 41% 23% 1	3160
	11th to 20th	Day	35% 4 10% 28% 20% 2	3140
	21st to end	Day	42% 3 11% 29% 12% 2	3282
November	1st to 10th	Day	41% 5% 14% 24% 12% 2	1753
	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	58% 6% 11% 17% 7%	4428
	11th to 20th	Night	59% 6% 12% 16% 8%	4440
	21st to end	Night	64% 5% 9% 16% 5% 1	4564
February	1st to 10th	Night	53% 5% 11% 18% 11% 1	2470
	11th to 20th	Night	45% 5% 12% 23% 13% 1	2369
	21st to end	Night	47% 6% 13% 21% 11% 2	1884
March	1st to 10th	Night	43% 5% 11% 25% 13% 2	3686
	11th to 20th	Night	35% 6% 10% 30% 17% 2	3480
	21st to end	Night	61% 5% 9% 16% 8% 1	3637
April	1st to 10th	Night	46% 6% 11% 22% 14% 1	1900
	11th to 20th	Night	46% 6% 9% 22% 15% 3	1875
	21st to end	Night	46% 7% 11% 20% 14% 3	1891
May	1st to 10th	Night	44% 7% 11% 18% 20% 1	2576
	11th to 20th	Night	38% 8% 9% 25% 17% 2	2507
	21st to end	Night	32% 10% 12% 27% 18% 2	2751
June	1st to 10th	Night	35% 7% 13% 26% 17% 2	1520
	11th to 20th	Night	35% 6% 12% 23% 21% 3	1520
	21st to end	Night	33% 8% 14% 24% 16% 4	1520
July	1st to 10th	Night	38% 6% 16% 25% 12% 2	2490
	11th to 20th	Night	22% 8% 17% 35% 16% 2	2482
	21st to end	Night	29% 8% 19% 21% 21% 2	2662
August	1st to 10th	Night	32% 7% 14% 28% 18% 1	2786
	11th to 20th	Night	31% 6% 14% 31% 16% 1	2907
	21st to end	Night	32% 6% 13% 27% 19% 4	3476
September	1st to 10th	Night	30% 7% 10% 27% 25% 1	1900
	11th to 20th	Night	31% 6% 11% 33% 17% 2	1900
	21st to end	Night	31% 6% 11% 29% 22% 1	2133
October	1st to 10th	Night	24% 4 7% 35% 29% 2	3800
	11th to 20th	Night	31% 5% 10% 23% 30% 2	3779
	21st to end	Night	45% 4 9% 24% 15% 1	4266
November	1st to 10th	Night	39% 5% 14% 23% 17% 2	2530
	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	19% 16% 43% 17% 6%	270
	21st to end	Day	21% 17% 35% 24% 3	297
February	1st to 10th	Day	16% 20% 43% 16% 5% 1	270
	11th to 20th	Day	21% 21% 32% 19% 6% 1	270
	21st to end	Day	22% 17% 39% 18% 4	225
March	1st to 10th	Day	15% 21% 41% 17% 6%	270
	11th to 20th	Day	19% 17% 37% 20% 6% 1	270
	21st to end	Day	28% 15% 32% 19% 5% 1	399
April	1st to 10th	Day	30% 14% 34% 17% 5%	460
	11th to 20th	Day	23% 21% 25% 23% 8% 1	452
	21st to end	Day	23% 15% 30% 20% 10% 2	465
May	1st to 10th	Day	20% 14% 32% 23% 9% 1	653
	11th to 20th	Day	21% 15% 28% 25% 9% 3	675
	21st to end	Day	20% 10% 26% 26% 14% 5%	734
June	1st to 10th	Day	10% 8% 28% 34% 16% 4	680
	11th to 20th	Day	16% 9% 29% 30% 13% 3	680
	21st to end	Day	15% 9% 31% 28% 14% 4	680
July	1st to 10th	Day	9% 6% 20% 30% 22% 13%	671
	11th to 20th	Day	9% 5% 28% 31% 19% 8%	668
	21st to end	Day	7% 4 26% 36% 21% 6%	739
August	1st to 10th	Day	8% 3 23% 34% 22% 10%	676
	11th to 20th	Day	15% 7% 17% 28% 22% 11%	618
	21st to end	Day	10% 6% 25% 31% 20% 8%	539
September	1st to 10th	Day	16% 9% 22% 29% 20% 5%	490
	11th to 20th	Day	13% 4 21% 36% 20% 6%	490
	21st to end	Day	18% 10% 28% 26% 15% 2	412
October	1st to 10th	Day	19% 9% 31% 26% 13% 2	300
	11th to 20th	Day	26% 17% 32% 18% 7%	300
	21st to end	Day	27% 16% 32% 18% 6% 2	330
November	1st to 10th	Day	16% 16% 38% 19% 8% 2	297
	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% 25% 8%	950
	11th to 20th	Night	19% 11% 37% 27% 5%	950
	21st to end	Night	20% 12% 36% 28% 5%	1045
February	1st to 10th	Night	17% 13% 38% 26% 6%	950
	11th to 20th	Night	16% 15% 40% 24% 6%	894
	21st to end	Night	21% 13% 38% 24% 4	628
March	1st to 10th	Night	22% 13% 35% 23% 7%	739
	11th to 20th	Night	17% 11% 35% 29% 7% 1	570
	21st to end	Night	24% 10% 32% 28% 5% 1	627
April	1st to 10th	Night	19% 15% 37% 25% 5%	570
	11th to 20th	Night	22% 12% 32% 28% 5%	563
	21st to end	Night	22% 9% 33% 27% 8% 1	570
May	1st to 10th	Night	19% 9% 34% 30% 7% 1	570
	11th to 20th	Night	17% 8% 30% 35% 8% 1	561
	21st to end	Night	15% 5% 29% 35% 16% 1	617
June	1st to 10th	Night	11% 5% 28% 44% 11% 1	570
	11th to 20th	Night	12% 4 29% 42% 12% 1	570
	21st to end	Night	12% 5% 27% 40% 14% 1	570
July	1st to 10th	Night	7% 2 17% 40% 31% 3	555
	11th to 20th	Night	7% 3 21% 44% 22% 4	552
	21st to end	Night	7% 2 16% 48% 25% 2	624
August	1st to 10th	Night	8% 3 16% 46% 27% 1	567
	11th to 20th	Night	10% 2 15% 42% 25% 6%	564
	21st to end	Night	11% 2 18% 43% 23% 3	627
September	1st to 10th	Night	13% 5% 21% 36% 20% 5%	570
	11th to 20th	Night	14% 3 21% 35% 24% 3	570
	21st to end	Night	12% 9% 27% 34% 18% 1	728
October	1st to 10th	Night	15% 7% 27% 33% 16% 2	760
	11th to 20th	Night	18% 12% 34% 27% 9%	760
	21st to end	Night	22% 13% 30% 29% 6%	836
November	1st to 10th	Night	18% 10% 37% 25% 9% 1	779
	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

Page generated at 2024-11-07 05:55:47. Version ac07

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