Catawissa
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Catawissa clear sky chart from 2005-11-06 to 2024-11-05.

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 4 5% 7% 43%	101209
	Night	14% 8% 3 6% 4 4 4 3 5% 6% 44%	97902
Transparency	Day	39% 4 11% 25% 18% 3	104842
	Night	40% 4 11% 24% 18% 3	102410
Seeing	Day	18% 12% 28% 25% 14% 4	15622
	Night	19% 12% 29% 27% 13% 1	25424

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% 12% 8% 10% 4 4 4 4 5% 6% 31%	2527
	11th to 20th	Day	13% 10% 4 7% 5% 5% 4 3 5% 6% 37%	2790
	21st to end	Day	21% 16% 5% 6% 4 3 3 3 3 4 30%	3135
February	1st to 10th	Day	15% 13% 4 9% 4 4 4 2 5% 5% 35%	1710
	11th to 20th	Day	15% 9% 3 7% 5% 4 4 3 5% 5% 38%	1810
	21st to end	Day	15% 10% 3 8% 4 4 3 4 4 7% 39%	1570
March	1st to 10th	Day	18% 12% 3 6% 4 3 3 2 4 4 41%	3213
	11th to 20th	Day	13% 8% 1 5% 4 3 3 3 4 7% 49%	3480
	21st to end	Day	15% 8% 3 7% 5% 4 5% 4 6% 6% 36%	3993
April	1st to 10th	Day	12% 6% 2 7% 4 4 5% 4 6% 7% 43%	2280
	11th to 20th	Day	18% 8% 3 5% 4 4 4 3 5% 5% 41%	2254
	21st to end	Day	18% 8% 2 7% 5% 5% 4 3 5% 7% 36%	2280
May	1st to 10th	Day	14% 8% 3 7% 6% 5% 5% 4 7% 8% 32%	3797
	11th to 20th	Day	18% 8% 2 6% 4 4 4 4 5% 7% 39%	4389
	21st to end	Day	10% 6% 2 6% 5% 5% 5% 4 6% 7% 44%	4824
June	1st to 10th	Day	9% 5% 2 6% 4 5% 5% 4 6% 9% 46%	2660
	11th to 20th	Day	8% 4 2 5% 4 4 4 4 6% 9% 51%	2660
	21st to end	Day	5% 4 1 4 5% 5% 5% 5% 7% 11% 48%	2660
July	1st to 10th	Day	13% 5% 2 6% 4 5% 5% 4 6% 9% 41%	4440
	11th to 20th	Day	4 4 2 5% 4 4 5% 4 7% 12% 49%	4440
	21st to end	Day	7% 6% 2 7% 5% 5% 5% 5% 7% 9% 41%	4503
August	1st to 10th	Day	5% 4 2 4 4 4 5% 5% 7% 9% 51%	4104
	11th to 20th	Day	13% 5% 2 6% 4 4 5% 4 6% 7% 44%	3738
	21st to end	Day	7% 4 2 4 3 4 4 4 6% 9% 52%	4180
September	1st to 10th	Day	13% 4 2 4 4 3 3 3 5% 7% 50%	2280
	11th to 20th	Day	11% 5% 2 5% 3 3 4 4 5% 7% 50%	2271
	21st to end	Day	8% 5% 2 6% 4 4 4 3 5% 7% 53%	2057
October	1st to 10th	Day	10% 4 2 5% 4 3 3 3 4 6% 56%	1900
	11th to 20th	Day	15% 6% 2 4 3 3 3 2 4 6% 53%	1900
	21st to end	Day	18% 8% 2 4 3 3 3 3 4 5% 47%	2090
November	1st to 10th	Day	12% 6% 1 4 4 3 2 3 4 6% 55%	1718
	11th to 20th	Day	14% 7% 3 5% 4 3 3 3 5% 6% 48%	1710
	21st to end	Day	17% 10% 3 6% 3 3 4 3 3 5% 43%	1625
December	1st to 10th	Day	15% 11% 3 6% 3 3 4 4 4 7% 40%	1520
	11th to 20th	Day	13% 12% 4 8% 4 4 3 3 4 7% 39%	1918
	21st to end	Day	18% 15% 5% 9% 5% 4 4 3 4 5% 27%	2783
January	1st to 10th	Night	15% 11% 7% 9% 4 4 3 3 4 4 36%	4428
	11th to 20th	Night	13% 12% 4 12% 5% 6% 6% 3 4 4 31%	4176
	21st to end	Night	24% 16% 4 7% 4 3 3 2 4 4 30%	4532
February	1st to 10th	Night	16% 12% 4 8% 4 4 4 3 5% 5% 35%	2470
	11th to 20th	Night	15% 9% 4 8% 4 4 3 2 4 5% 42%	2254
	21st to end	Night	17% 10% 3 8% 5% 3 4 3 4 4 39%	1884
March	1st to 10th	Night	22% 11% 2 5% 4 3 3 2 3 4 43%	3669
	11th to 20th	Night	14% 7% 2 4 3 3 3 3 4 7% 51%	3480
	21st to end	Night	18% 10% 3 7% 5% 5% 5% 4 5% 5% 33%	3636
April	1st to 10th	Night	12% 7% 3 6% 3 3 4 4 5% 6% 47%	1900
	11th to 20th	Night	14% 8% 2 6% 3 4 3 2 5% 7% 45%	1875
	21st to end	Night	19% 7% 2 6% 4 3 3 3 5% 7% 41%	1900
May	1st to 10th	Night	18% 7% 2 6% 3 4 4 4 5% 8% 40%	3083
	11th to 20th	Night	15% 8% 2 6% 4 3 4 3 5% 7% 43%	2512
	21st to end	Night	10% 6% 2 6% 5% 6% 5% 4 7% 9% 42%	2743
June	1st to 10th	Night	9% 5% 2 6% 4 4 4 4 7% 9% 49%	1520
	11th to 20th	Night	6% 4 2 4 4 3 4 3 6% 10% 55%	1520
	21st to end	Night	4 3 2 4 4 4 4 4 5% 9% 56%	1520
July	1st to 10th	Night	13% 6% 2 5% 4 3 3 4 5% 9% 45%	2530
	11th to 20th	Night	5% 4 1 5% 4 3 3 3 5% 9% 57%	2530
	21st to end	Night	6% 6% 3 6% 5% 5% 5% 5% 7% 11% 41%	3056
August	1st to 10th	Night	5% 3 1 4 3 3 4 4 6% 8% 59%	2836
	11th to 20th	Night	11% 5% 2 6% 4 4 4 3 5% 8% 47%	3091
	21st to end	Night	5% 3 1 4 3 4 4 3 5% 10% 58%	3476
September	1st to 10th	Night	12% 5% 1 5% 3 3 3 3 5% 6% 53%	1900
	11th to 20th	Night	9% 5% 2 5% 4 4 4 3 5% 7% 52%	1900
	21st to end	Night	10% 4 2 5% 3 4 4 3 4 6% 55%	2107
October	1st to 10th	Night	8% 4 2 5% 3 3 3 2 4 7% 60%	2280
	11th to 20th	Night	14% 6% 2 5% 2 2 3 3 5% 6% 53%	2280
	21st to end	Night	18% 8% 2 4 3 3 3 2 4 5% 48%	2508
November	1st to 10th	Night	11% 6% 1 4 3 3 3 3 4 5% 56%	2460
	11th to 20th	Night	15% 6% 3 5% 3 3 4 3 5% 7% 48%	2470
	21st to end	Night	18% 9% 3 5% 3 3 2 2 4 5% 44%	2553
December	1st to 10th	Night	16% 11% 3 6% 4 3 4 3 5% 6% 37%	2660
	11th to 20th	Night	16% 11% 4 6% 4 5% 3 3 4 5% 40%	3279
	21st to end	Night	17% 19% 5% 9% 5% 4 4 3 4 5% 24%	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	52% 3 11% 23% 9% 1	2528
	11th to 20th	Day	48% 2 12% 24% 14%	2790
	21st to end	Day	59% 2 9% 17% 12% 2	3135
February	1st to 10th	Day	51% 3 10% 23% 11% 1	1710
	11th to 20th	Day	47% 4 10% 20% 14% 4	1820
	21st to end	Day	46% 4 9% 23% 14% 4	1570
March	1st to 10th	Day	48% 3 6% 20% 17% 6%	3213
	11th to 20th	Day	37% 3 11% 27% 17% 6%	3480
	21st to end	Day	48% 4 16% 22% 10% 1	3993
April	1st to 10th	Day	40% 4 11% 25% 19% 1	2280
	11th to 20th	Day	44% 4 9% 24% 16% 4	2254
	21st to end	Day	49% 4 10% 23% 14% 1	2280
May	1st to 10th	Day	47% 5% 13% 23% 11% 1	3832
	11th to 20th	Day	45% 4 11% 26% 13% 1	4393
	21st to end	Day	38% 6% 9% 23% 22% 1	4837
June	1st to 10th	Day	35% 6% 12% 28% 17% 2	2660
	11th to 20th	Day	30% 5% 12% 28% 22% 4	2660
	21st to end	Day	28% 7% 17% 26% 16% 5%	2660
July	1st to 10th	Day	39% 6% 11% 29% 12% 2	4371
	11th to 20th	Day	27% 6% 15% 33% 17% 2	4365
	21st to end	Day	36% 8% 17% 27% 11% 1	4361
August	1st to 10th	Day	27% 6% 16% 35% 16%	4090
	11th to 20th	Day	38% 6% 13% 25% 17% 2	3774
	21st to end	Day	28% 6% 15% 34% 15% 3	4179
September	1st to 10th	Day	33% 5% 9% 27% 21% 5%	2280
	11th to 20th	Day	33% 4 8% 27% 25% 2	2271
	21st to end	Day	31% 5% 7% 30% 24% 3	2057
October	1st to 10th	Day	18% 2 6% 19% 48% 7%	3160
	11th to 20th	Day	24% 2 7% 22% 37% 9%	3140
	21st to end	Day	33% 3 7% 28% 27% 3	3428
November	1st to 10th	Day	32% 3 13% 25% 21% 6%	1718
	11th to 20th	Day	38% 2 9% 25% 22% 5%	1710
	21st to end	Day	45% 3 9% 27% 16%	1625
December	1st to 10th	Day	46% 3 11% 26% 13% 1	1520
	11th to 20th	Day	47% 3 11% 23% 15% 2	1915
	21st to end	Day	60% 3 11% 15% 10% 1	2783
January	1st to 10th	Night	53% 2 10% 24% 10% 1	4428
	11th to 20th	Night	59% 2 8% 20% 9% 1	4176
	21st to end	Night	60% 2 9% 21% 7% 1	4532
February	1st to 10th	Night	52% 4 10% 20% 13% 1	2470
	11th to 20th	Night	46% 3 9% 22% 17% 3	2255
	21st to end	Night	49% 3 9% 21% 14% 4	1884
March	1st to 10th	Night	48% 2 7% 24% 16% 3	3669
	11th to 20th	Night	36% 3 12% 25% 20% 4	3480
	21st to end	Night	53% 4 11% 25% 7%	3636
April	1st to 10th	Night	37% 4 11% 26% 18% 4	1900
	11th to 20th	Night	40% 4 9% 24% 18% 4	1875
	21st to end	Night	45% 3 9% 25% 16% 2	1900
May	1st to 10th	Night	44% 5% 15% 21% 14% 2	3113
	11th to 20th	Night	41% 4 14% 26% 14% 1	2513
	21st to end	Night	38% 6% 13% 24% 17% 2	2751
June	1st to 10th	Night	31% 5% 15% 28% 17% 4	1520
	11th to 20th	Night	25% 4 12% 29% 26% 4	1520
	21st to end	Night	24% 5% 16% 30% 19% 7%	1520
July	1st to 10th	Night	36% 4 13% 29% 14% 4	2490
	11th to 20th	Night	24% 4 11% 37% 20% 3	2482
	21st to end	Night	34% 7% 19% 26% 13% 1	2959
August	1st to 10th	Night	22% 6% 18% 33% 20% 1	2826
	11th to 20th	Night	35% 4 13% 26% 18% 3	3121
	21st to end	Night	23% 5% 14% 36% 18% 3	3476
September	1st to 10th	Night	33% 4 10% 25% 23% 6%	1900
	11th to 20th	Night	31% 5% 9% 26% 26% 4	1900
	21st to end	Night	31% 4 8% 26% 27% 4	2107
October	1st to 10th	Night	16% 2 7% 18% 50% 9%	3800
	11th to 20th	Night	22% 2 7% 23% 36% 11%	3779
	21st to end	Night	31% 3 8% 26% 27% 5%	4120
November	1st to 10th	Night	31% 3 12% 26% 22% 6%	2460
	11th to 20th	Night	38% 3 8% 25% 23% 5%	2470
	21st to end	Night	43% 3 9% 25% 18% 2	2553
December	1st to 10th	Night	48% 3 11% 25% 12% 1	2660
	11th to 20th	Night	48% 3 8% 24% 16% 1	3281
	21st to end	Night	64% 3 10% 14% 7% 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	29% 22% 30% 15% 3 1	270
	11th to 20th	Day	34% 22% 33% 11%	270
	21st to end	Day	25% 28% 34% 12% 2	297
February	1st to 10th	Day	29% 24% 33% 11% 2	270
	11th to 20th	Day	30% 26% 30% 11% 3	270
	21st to end	Day	33% 23% 36% 8% 1	225
March	1st to 10th	Day	23% 23% 44% 9% 2	270
	11th to 20th	Day	35% 19% 32% 10% 3 1	270
	21st to end	Day	34% 18% 33% 12% 4	399
April	1st to 10th	Day	25% 17% 34% 19% 5%	460
	11th to 20th	Day	29% 15% 31% 17% 6% 1	452
	21st to end	Day	25% 17% 35% 17% 5%	460
May	1st to 10th	Day	22% 18% 34% 20% 6% 1	463
	11th to 20th	Day	20% 14% 29% 23% 12% 2	665
	21st to end	Day	13% 11% 33% 25% 12% 5%	734
June	1st to 10th	Day	11% 6% 25% 33% 20% 5%	680
	11th to 20th	Day	9% 6% 23% 41% 16% 5%	680
	21st to end	Day	5% 9% 32% 34% 16% 5%	680
July	1st to 10th	Day	13% 3 16% 30% 27% 10%	671
	11th to 20th	Day	6% 3 25% 38% 22% 5%	668
	21st to end	Day	10% 4 19% 32% 28% 6%	739
August	1st to 10th	Day	9% 3 18% 39% 25% 6%	676
	11th to 20th	Day	14% 3 22% 29% 25% 7%	488
	21st to end	Day	11% 2 17% 28% 32% 10%	539
September	1st to 10th	Day	13% 4 18% 31% 27% 7%	490
	11th to 20th	Day	11% 3 19% 30% 26% 12%	490
	21st to end	Day	12% 9% 23% 31% 19% 6%	457
October	1st to 10th	Day	14% 9% 28% 33% 10% 5%	300
	11th to 20th	Day	23% 15% 33% 21% 7% 1	300
	21st to end	Day	34% 18% 29% 17% 2	330
November	1st to 10th	Day	16% 12% 42% 18% 8% 4	282
	11th to 20th	Day	25% 17% 31% 19% 6% 1	270
	21st to end	Day	29% 14% 34% 17% 6% 1	270
December	1st to 10th	Day	22% 21% 32% 16% 7% 2	270
	11th to 20th	Day	25% 19% 35% 16% 4	270
	21st to end	Day	30% 23% 33% 12% 2	297
January	1st to 10th	Night	21% 21% 34% 20% 4	950
	11th to 20th	Night	25% 21% 34% 17% 3	950
	21st to end	Night	24% 19% 35% 20% 2	1045
February	1st to 10th	Night	26% 19% 33% 20% 3	950
	11th to 20th	Night	23% 19% 39% 16% 2	779
	21st to end	Night	26% 20% 34% 18% 2	628
March	1st to 10th	Night	26% 16% 36% 19% 3	722
	11th to 20th	Night	25% 13% 34% 23% 5%	570
	21st to end	Night	26% 15% 35% 21% 4	627
April	1st to 10th	Night	17% 19% 35% 24% 5%	570
	11th to 20th	Night	20% 14% 33% 25% 8%	563
	21st to end	Night	23% 13% 34% 24% 5%	570
May	1st to 10th	Night	18% 11% 32% 31% 8% 1	570
	11th to 20th	Night	19% 5% 28% 32% 14% 1	561
	21st to end	Night	12% 5% 26% 35% 19% 3	617
June	1st to 10th	Night	11% 4 20% 38% 26% 1	570
	11th to 20th	Night	9% 2 25% 45% 19% 1	570
	21st to end	Night	5% 4 25% 43% 21% 2	570
July	1st to 10th	Night	11% 1 12% 38% 32% 5%	555
	11th to 20th	Night	5% 2 17% 43% 31% 2	552
	21st to end	Night	7% 2 15% 41% 32% 3	624
August	1st to 10th	Night	7% 2 13% 41% 34% 3	567
	11th to 20th	Night	9% 3 13% 40% 31% 5%	564
	21st to end	Night	7% 1 14% 37% 36% 4	627
September	1st to 10th	Night	14% 3 15% 34% 29% 5%	570
	11th to 20th	Night	12% 3 15% 35% 30% 6%	570
	21st to end	Night	11% 7% 23% 30% 25% 4	749
October	1st to 10th	Night	9% 6% 27% 31% 22% 4	760
	11th to 20th	Night	18% 13% 31% 26% 12% 1	760
	21st to end	Night	25% 14% 32% 23% 6%	836
November	1st to 10th	Night	14% 12% 38% 26% 10%	760
	11th to 20th	Night	21% 15% 32% 25% 7%	760
	21st to end	Night	24% 15% 33% 23% 5%	843
December	1st to 10th	Night	25% 15% 33% 22% 4 1	950
	11th to 20th	Night	26% 13% 30% 26% 4	950
	21st to end	Night	29% 17% 32% 19% 2	1045

Page generated at 2024-11-03 01:11:28. Version ac07

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