Banjo Creek
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Banjo Creek clear sky chart from 2005-11-06 to 2024-11-25.

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% 6% 2 7% 5% 5% 5% 4 6% 8% 40%	100971
	Night	13% 6% 2 6% 4 4 4 4 6% 7% 42%	98445
Transparency	Day	40% 8% 12% 20% 16% 4	104615
	Night	38% 8% 12% 20% 17% 5%	102940
Seeing	Day	16% 12% 27% 26% 15% 4	15502
	Night	16% 11% 28% 31% 14% 2	25270

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% 6% 2 5% 3 3 3 3 3 5% 52%	2836
	11th to 20th	Day	12% 5% 2 6% 4 4 4 3 5% 5% 50%	2840
	21st to end	Day	14% 10% 3 7% 4 4 4 3 4 5% 41%	3124
February	1st to 10th	Day	14% 8% 3 6% 5% 4 4 3 5% 5% 43%	1710
	11th to 20th	Day	19% 6% 2 6% 5% 4 3 3 4 5% 44%	1824
	21st to end	Day	14% 7% 3 6% 5% 4 4 3 6% 7% 40%	1570
March	1st to 10th	Day	25% 9% 2 5% 3 3 3 3 5% 6% 35%	3399
	11th to 20th	Day	11% 5% 2 5% 3 3 3 3 5% 6% 53%	3480
	21st to end	Day	16% 5% 2 5% 3 4 4 3 4 5% 48%	3895
April	1st to 10th	Day	11% 6% 2 4 3 3 4 3 4 6% 53%	2280
	11th to 20th	Day	10% 4 2 5% 4 3 4 4 5% 8% 50%	2254
	21st to end	Day	9% 5% 2 6% 5% 4 5% 4 6% 8% 47%	2280
May	1st to 10th	Day	10% 6% 3 7% 5% 6% 6% 5% 8% 9% 37%	3765
	11th to 20th	Day	17% 8% 3 8% 6% 6% 5% 4 6% 7% 30%	4004
	21st to end	Day	7% 5% 2 7% 5% 5% 6% 4 6% 10% 42%	4751
June	1st to 10th	Day	9% 6% 2 6% 6% 6% 6% 6% 7% 10% 35%	2660
	11th to 20th	Day	9% 5% 2 6% 6% 6% 6% 5% 8% 10% 38%	2660
	21st to end	Day	6% 6% 2 6% 6% 6% 7% 6% 9% 12% 33%	2660
July	1st to 10th	Day	8% 5% 3 8% 6% 6% 7% 6% 9% 12% 30%	4229
	11th to 20th	Day	10% 8% 3 11% 7% 7% 7% 6% 8% 9% 23%	4120
	21st to end	Day	11% 8% 3 10% 7% 7% 7% 6% 8% 9% 25%	4466
August	1st to 10th	Day	20% 11% 4 10% 6% 6% 5% 4 7% 9% 20%	4042
	11th to 20th	Day	10% 7% 2 7% 6% 6% 6% 5% 8% 8% 36%	3730
	21st to end	Day	8% 5% 2 7% 6% 6% 6% 5% 7% 10% 38%	4180
September	1st to 10th	Day	12% 7% 3 7% 5% 6% 5% 4 7% 8% 36%	2280
	11th to 20th	Day	15% 6% 3 7% 5% 5% 6% 4 5% 7% 36%	2280
	21st to end	Day	20% 8% 2 7% 5% 4 3 4 5% 7% 35%	2023
October	1st to 10th	Day	14% 7% 2 6% 4 4 4 3 4 6% 45%	1900
	11th to 20th	Day	11% 6% 3 5% 4 4 3 2 4 7% 52%	1900
	21st to end	Day	11% 6% 3 5% 3 3 3 3 5% 5% 53%	2090
November	1st to 10th	Day	15% 6% 2 5% 4 3 3 2 4 7% 49%	1957
	11th to 20th	Day	15% 6% 2 3 4 3 4 3 5% 5% 50%	1805
	21st to end	Day	13% 5% 2 4 3 3 3 4 5% 7% 51%	1735
December	1st to 10th	Day	17% 7% 2 6% 5% 5% 3 3 5% 6% 40%	1520
	11th to 20th	Day	16% 6% 2 4 3 2 3 2 4 5% 52%	1910
	21st to end	Day	14% 8% 2 6% 3 3 4 3 5% 6% 46%	2812
January	1st to 10th	Night	14% 7% 2 5% 4 3 4 3 5% 6% 46%	4109
	11th to 20th	Night	14% 7% 2 6% 5% 4 4 4 6% 7% 41%	4120
	21st to end	Night	14% 7% 3 7% 4 4 4 4 5% 6% 44%	4532
February	1st to 10th	Night	18% 6% 2 4 4 3 4 3 5% 7% 42%	2470
	11th to 20th	Night	19% 8% 3 7% 3 3 4 3 4 6% 41%	2240
	21st to end	Night	16% 7% 2 5% 3 3 3 4 4 6% 46%	1884
March	1st to 10th	Night	25% 10% 3 6% 4 4 4 3 5% 4 33%	3451
	11th to 20th	Night	13% 6% 2 5% 4 3 3 3 5% 6% 51%	3480
	21st to end	Night	18% 5% 2 4 3 3 3 3 4 6% 49%	3736
April	1st to 10th	Night	13% 4 2 6% 4 4 4 3 5% 6% 49%	1900
	11th to 20th	Night	10% 5% 2 5% 4 5% 5% 4 6% 7% 48%	1875
	21st to end	Night	10% 4 1 5% 4 5% 4 3 6% 7% 51%	1900
May	1st to 10th	Night	9% 6% 3 7% 5% 6% 6% 5% 6% 7% 38%	3130
	11th to 20th	Night	19% 7% 2 7% 4 4 5% 3 5% 7% 36%	2918
	21st to end	Night	7% 5% 2 7% 4 5% 5% 4 7% 11% 43%	2799
June	1st to 10th	Night	8% 6% 3 7% 5% 4 5% 5% 7% 9% 41%	1520
	11th to 20th	Night	7% 5% 2 6% 5% 5% 5% 5% 8% 11% 41%	1520
	21st to end	Night	7% 6% 3 6% 5% 5% 7% 5% 8% 11% 38%	1520
July	1st to 10th	Night	7% 4 2 7% 6% 4 6% 5% 9% 14% 36%	2712
	11th to 20th	Night	9% 7% 3 8% 5% 6% 7% 5% 9% 12% 28%	2840
	21st to end	Night	13% 6% 3 8% 6% 5% 6% 5% 8% 9% 30%	3087
August	1st to 10th	Night	16% 10% 4 7% 5% 5% 6% 4 7% 10% 26%	2854
	11th to 20th	Night	9% 7% 3 8% 6% 5% 7% 5% 6% 9% 35%	3097
	21st to end	Night	7% 4 2 7% 4 5% 6% 6% 9% 10% 40%	3476
September	1st to 10th	Night	10% 5% 2 6% 5% 5% 5% 5% 6% 9% 43%	1900
	11th to 20th	Night	14% 7% 3 6% 5% 4 4 5% 6% 7% 40%	1900
	21st to end	Night	17% 7% 3 8% 5% 5% 4 4 5% 7% 36%	2152
October	1st to 10th	Night	13% 6% 2 5% 4 4 4 3 5% 6% 48%	2280
	11th to 20th	Night	13% 6% 2 5% 3 3 3 3 4 5% 53%	2280
	21st to end	Night	10% 5% 2 5% 3 3 3 3 5% 6% 56%	2508
November	1st to 10th	Night	14% 6% 2 6% 4 3 4 2 5% 5% 49%	2341
	11th to 20th	Night	16% 7% 3 5% 3 3 3 3 4 5% 47%	2593
	21st to end	Night	12% 5% 2 6% 3 3 3 3 5% 7% 51%	2537
December	1st to 10th	Night	16% 7% 2 7% 4 4 4 3 5% 6% 41%	2660
	11th to 20th	Night	17% 5% 3 6% 3 3 3 3 4 5% 47%	3285
	21st to end	Night	15% 6% 2 5% 4 3 4 3 5% 7% 46%	4839

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	35% 4 8% 25% 23% 5%	2837
	11th to 20th	Day	35% 5% 7% 17% 28% 7%	2840
	21st to end	Day	45% 7% 8% 15% 18% 8%	3124
February	1st to 10th	Day	41% 5% 11% 22% 18% 3	1710
	11th to 20th	Day	43% 4 8% 17% 22% 6%	1833
	21st to end	Day	42% 7% 10% 17% 18% 6%	1570
March	1st to 10th	Day	49% 6% 11% 15% 13% 7%	3399
	11th to 20th	Day	30% 7% 8% 17% 24% 14%	3480
	21st to end	Day	39% 5% 9% 24% 18% 5%	3895
April	1st to 10th	Day	33% 6% 10% 20% 24% 7%	2280
	11th to 20th	Day	31% 7% 12% 21% 22% 7%	2254
	21st to end	Day	34% 8% 13% 23% 18% 4	2280
May	1st to 10th	Day	39% 13% 17% 19% 10% 2	3800
	11th to 20th	Day	49% 10% 11% 20% 10% 1	4008
	21st to end	Day	33% 11% 16% 26% 12% 2	4765
June	1st to 10th	Day	41% 12% 15% 18% 14% 1	2660
	11th to 20th	Day	36% 12% 18% 19% 13% 1	2660
	21st to end	Day	39% 13% 17% 19% 11% 1	2660
July	1st to 10th	Day	41% 14% 17% 18% 9% 1	4164
	11th to 20th	Day	53% 12% 19% 12% 3 1	4051
	21st to end	Day	51% 11% 14% 15% 8%	4324
August	1st to 10th	Day	59% 11% 17% 10% 3	4029
	11th to 20th	Day	42% 11% 13% 22% 11%	3766
	21st to end	Day	38% 9% 16% 26% 10% 1	4180
September	1st to 10th	Day	42% 10% 17% 14% 13% 4	2280
	11th to 20th	Day	45% 8% 11% 18% 15% 3	2280
	21st to end	Day	48% 8% 10% 17% 15% 3	2023
October	1st to 10th	Day	36% 5% 8% 23% 23% 6%	3160
	11th to 20th	Day	24% 4 5% 18% 26% 22%	3140
	21st to end	Day	25% 4 5% 26% 31% 8%	3428
November	1st to 10th	Day	36% 5% 10% 20% 25% 5%	1957
	11th to 20th	Day	36% 4 8% 21% 24% 7%	1805
	21st to end	Day	33% 5% 9% 24% 24% 5%	1735
December	1st to 10th	Day	43% 7% 10% 22% 14% 4	1520
	11th to 20th	Day	36% 4 7% 25% 20% 8%	1906
	21st to end	Day	38% 6% 11% 20% 22% 2	2812
January	1st to 10th	Night	37% 6% 9% 21% 22% 4	4109
	11th to 20th	Night	42% 6% 8% 17% 22% 6%	4120
	21st to end	Night	41% 6% 9% 17% 20% 7%	4532
February	1st to 10th	Night	40% 5% 10% 22% 18% 5%	2470
	11th to 20th	Night	45% 5% 10% 15% 19% 7%	2242
	21st to end	Night	39% 5% 9% 20% 18% 7%	1884
March	1st to 10th	Night	54% 6% 9% 14% 13% 4	3451
	11th to 20th	Night	33% 7% 9% 12% 24% 14%	3480
	21st to end	Night	35% 6% 11% 26% 17% 5%	3736
April	1st to 10th	Night	36% 7% 11% 17% 22% 7%	1900
	11th to 20th	Night	34% 7% 12% 22% 19% 5%	1875
	21st to end	Night	30% 9% 14% 26% 17% 4	1900
May	1st to 10th	Night	39% 14% 17% 20% 9% 2	3160
	11th to 20th	Night	46% 9% 12% 20% 13% 1	2919
	21st to end	Night	29% 14% 20% 25% 11% 1	2806
June	1st to 10th	Night	36% 10% 18% 23% 12% 1	1520
	11th to 20th	Night	32% 13% 18% 25% 10% 1	1520
	21st to end	Night	37% 12% 19% 21% 11%	1520
July	1st to 10th	Night	36% 14% 23% 19% 8% 1	2667
	11th to 20th	Night	44% 13% 25% 14% 4	2786
	21st to end	Night	48% 13% 14% 16% 8%	2988
August	1st to 10th	Night	51% 10% 22% 15% 2	2843
	11th to 20th	Night	43% 11% 17% 20% 8%	3127
	21st to end	Night	34% 10% 17% 26% 12% 1	3476
September	1st to 10th	Night	36% 12% 17% 17% 15% 2	1900
	11th to 20th	Night	41% 9% 13% 19% 15% 3	1900
	21st to end	Night	46% 8% 13% 20% 13% 2	2152
October	1st to 10th	Night	40% 5% 7% 19% 26% 3	3800
	11th to 20th	Night	24% 3 5% 18% 24% 25%	3779
	21st to end	Night	22% 4 7% 28% 29% 11%	4120
November	1st to 10th	Night	36% 6% 8% 19% 25% 6%	2341
	11th to 20th	Night	39% 5% 8% 16% 24% 8%	2593
	21st to end	Night	33% 5% 9% 24% 23% 6%	2537
December	1st to 10th	Night	44% 6% 13% 17% 17% 4	2660
	11th to 20th	Night	38% 6% 8% 19% 23% 6%	3288
	21st to end	Night	36% 6% 9% 23% 22% 3	4839

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	21% 26% 36% 14% 2	270
	11th to 20th	Day	21% 26% 33% 18% 1	270
	21st to end	Day	23% 24% 36% 13% 4	297
February	1st to 10th	Day	22% 20% 39% 17% 2	270
	11th to 20th	Day	29% 22% 35% 12% 2	432
	21st to end	Day	20% 24% 35% 18% 3 1	382
March	1st to 10th	Day	22% 19% 37% 17% 5% 1	460
	11th to 20th	Day	23% 22% 34% 14% 6% 1	460
	21st to end	Day	21% 19% 37% 16% 7%	506
April	1st to 10th	Day	20% 22% 35% 16% 5% 2	460
	11th to 20th	Day	14% 18% 34% 22% 8% 5%	452
	21st to end	Day	13% 15% 33% 26% 11% 2	460
May	1st to 10th	Day	13% 17% 35% 23% 9% 2	463
	11th to 20th	Day	17% 10% 27% 31% 13% 3	487
	21st to end	Day	14% 7% 24% 30% 19% 6%	529
June	1st to 10th	Day	10% 7% 29% 32% 18% 4	490
	11th to 20th	Day	10% 5% 22% 35% 19% 8%	490
	21st to end	Day	6% 6% 21% 38% 23% 6%	490
July	1st to 10th	Day	8% 3 15% 34% 30% 9%	485
	11th to 20th	Day	9% 3 13% 37% 31% 7%	484
	21st to end	Day	9% 3 19% 36% 27% 5%	532
August	1st to 10th	Day	14% 5% 18% 33% 22% 8%	486
	11th to 20th	Day	12% 3 16% 30% 28% 11%	479
	21st to end	Day	12% 4 16% 33% 26% 10%	539
September	1st to 10th	Day	12% 6% 21% 28% 20% 14%	490
	11th to 20th	Day	17% 5% 19% 33% 18% 7%	490
	21st to end	Day	23% 6% 23% 25% 17% 7%	490
October	1st to 10th	Day	17% 7% 23% 27% 18% 8%	490
	11th to 20th	Day	14% 12% 27% 30% 13% 4	490
	21st to end	Day	14% 13% 27% 24% 19% 4	539
November	1st to 10th	Day	17% 13% 28% 27% 11% 3	495
	11th to 20th	Day	19% 14% 32% 24% 9% 2	403
	21st to end	Day	19% 14% 27% 24% 15% 1	371
December	1st to 10th	Day	22% 18% 41% 13% 6% 1	180
	11th to 20th	Day	20% 22% 30% 18% 8% 2	180
	21st to end	Day	19% 17% 35% 17% 11% 1	211
January	1st to 10th	Night	20% 20% 31% 23% 5%	760
	11th to 20th	Night	19% 17% 30% 29% 6%	760
	21st to end	Night	19% 18% 36% 24% 3	836
February	1st to 10th	Night	21% 16% 33% 26% 4	760
	11th to 20th	Night	24% 23% 34% 17% 2	743
	21st to end	Night	20% 19% 34% 24% 3	628
March	1st to 10th	Night	18% 16% 37% 24% 5%	760
	11th to 20th	Night	21% 16% 37% 20% 5% 1	760
	21st to end	Night	18% 18% 35% 23% 6%	836
April	1st to 10th	Night	15% 18% 40% 23% 5%	760
	11th to 20th	Night	13% 15% 39% 25% 8%	751
	21st to end	Night	11% 13% 39% 32% 5% 1	760
May	1st to 10th	Night	13% 13% 41% 26% 7% 1	760
	11th to 20th	Night	17% 9% 28% 34% 11%	628
	21st to end	Night	9% 4 19% 44% 22% 2	453
June	1st to 10th	Night	10% 3 26% 46% 14% 1	380
	11th to 20th	Night	7% 2 25% 46% 19% 2	380
	21st to end	Night	8% 3 20% 49% 18% 1	380
July	1st to 10th	Night	10% 2 12% 47% 26% 4	479
	11th to 20th	Night	8% 1 11% 45% 27% 7%	552
	21st to end	Night	9% 2 16% 47% 24% 2	624
August	1st to 10th	Night	14% 3 11% 40% 28% 4	583
	11th to 20th	Night	11% 2 14% 40% 28% 5%	750
	21st to end	Night	13% 2 13% 35% 31% 5%	836
September	1st to 10th	Night	11% 2 19% 31% 29% 6%	760
	11th to 20th	Night	15% 3 20% 36% 22% 4	760
	21st to end	Night	21% 5% 19% 31% 21% 3	760
October	1st to 10th	Night	14% 6% 23% 30% 24% 4	760
	11th to 20th	Night	16% 9% 26% 31% 17% 2	760
	21st to end	Night	14% 9% 26% 30% 18% 3	836
November	1st to 10th	Night	16% 10% 24% 34% 15% 1	780
	11th to 20th	Night	19% 12% 30% 27% 10% 1	800
	21st to end	Night	14% 14% 30% 27% 15% 1	779
December	1st to 10th	Night	21% 13% 29% 28% 8%	760
	11th to 20th	Night	17% 12% 34% 29% 7% 1	760
	21st to end	Night	16% 16% 31% 28% 8%	836

Page generated at 2024-11-22 08:02:27. Version ac07

Copyright © 2024 Attilla Danko.