Innisfail
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Innisfail clear sky chart from 2005-11-06 to 2026-01-17.

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	9% 9% 3 8% 5% 5% 5% 4 6% 8% 36%	131743
	Night	7% 10% 4 10% 6% 5% 5% 4 6% 8% 34%	128649
Transparency	Day	43% 7% 15% 24% 10% 1	131443
	Night	45% 7% 14% 22% 10% 2	128527
Seeing	Day	12% 6% 23% 32% 20% 7%	16871
	Night	12% 6% 27% 38% 16% 2	26033

By Month

Percentage Cloud Cover NW (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	3 10% 6% 15% 8% 6% 5% 5% 6% 7% 29%	3249
	11th to 20th	Day	3 11% 5% 9% 7% 6% 6% 5% 8% 8% 31%	3201
	21st to end	Day	3 10% 4 9% 5% 6% 5% 4 6% 8% 40%	3972
February	1st to 10th	Day	6% 14% 5% 10% 7% 6% 6% 5% 6% 8% 26%	1600
	11th to 20th	Day	5% 13% 5% 13% 6% 8% 6% 5% 6% 8% 25%	1720
	21st to end	Day	3 12% 6% 11% 8% 6% 7% 6% 6% 9% 27%	1585
March	1st to 10th	Day	3 9% 4 12% 7% 5% 5% 3 5% 10% 36%	4518
	11th to 20th	Day	5% 11% 4 10% 6% 4 5% 3 7% 8% 37%	4945
	21st to end	Day	9% 20% 6% 12% 5% 5% 5% 4 6% 6% 21%	5573
April	1st to 10th	Day	8% 13% 4 8% 7% 5% 6% 5% 6% 7% 31%	2468
	11th to 20th	Day	11% 14% 4 9% 6% 5% 5% 4 6% 7% 29%	2570
	21st to end	Day	12% 12% 4 8% 6% 4 5% 4 6% 9% 31%	2600
May	1st to 10th	Day	13% 9% 3 7% 4 5% 5% 4 6% 7% 37%	6379
	11th to 20th	Day	12% 11% 4 10% 6% 5% 6% 5% 8% 8% 25%	6734
	21st to end	Day	13% 8% 3 7% 5% 5% 5% 4 6% 7% 38%	7405
June	1st to 10th	Day	15% 7% 2 7% 6% 6% 6% 5% 7% 8% 31%	3000
	11th to 20th	Day	18% 9% 3 8% 6% 6% 5% 5% 6% 8% 25%	3000
	21st to end	Day	10% 6% 2 7% 5% 5% 5% 5% 8% 10% 37%	3000
July	1st to 10th	Day	8% 5% 2 5% 3 4 4 3 6% 9% 50%	6780
	11th to 20th	Day	11% 5% 2 5% 4 4 5% 4 7% 10% 42%	6780
	21st to end	Day	11% 5% 2 6% 4 4 5% 4 6% 9% 45%	7331
August	1st to 10th	Day	9% 6% 2 6% 5% 5% 5% 4 7% 10% 41%	4541
	11th to 20th	Day	7% 5% 2 5% 5% 5% 6% 5% 9% 11% 40%	4248
	21st to end	Day	10% 5% 2 5% 4 4 5% 4 6% 8% 48%	4664
September	1st to 10th	Day	11% 5% 2 6% 4 4 4 4 6% 8% 46%	2501
	11th to 20th	Day	15% 7% 2 5% 3 4 4 3 5% 7% 46%	2200
	21st to end	Day	8% 8% 3 6% 5% 5% 5% 4 6% 9% 43%	2200
October	1st to 10th	Day	7% 8% 3 6% 5% 5% 5% 5% 6% 10% 40%	3441
	11th to 20th	Day	7% 8% 3 8% 5% 6% 5% 4 7% 10% 38%	2979
	21st to end	Day	7% 8% 4 8% 6% 5% 5% 4 6% 6% 40%	3200
November	1st to 10th	Day	7% 16% 4 10% 7% 5% 5% 4 6% 7% 28%	1686
	11th to 20th	Day	6% 14% 4 9% 6% 5% 6% 4 5% 7% 34%	1556
	21st to end	Day	6% 12% 4 12% 7% 6% 6% 3 6% 8% 30%	1470
December	1st to 10th	Day	7% 15% 4 10% 7% 6% 5% 4 6% 8% 27%	2360
	11th to 20th	Day	6% 11% 4 12% 8% 7% 7% 5% 7% 7% 27%	2712
	21st to end	Day	3 8% 5% 9% 6% 6% 5% 5% 5% 8% 41%	3575
January	1st to 10th	Night	3 12% 6% 15% 8% 6% 6% 5% 6% 7% 25%	6916
	11th to 20th	Night	3 11% 4 12% 7% 6% 7% 5% 6% 7% 33%	6830
	21st to end	Night	3 10% 5% 10% 5% 5% 5% 5% 7% 8% 37%	7026
February	1st to 10th	Night	6% 13% 5% 12% 8% 7% 6% 4 6% 7% 26%	2800
	11th to 20th	Night	5% 13% 5% 11% 7% 7% 7% 5% 6% 7% 27%	2567
	21st to end	Night	3 11% 4 10% 7% 6% 6% 5% 6% 8% 32%	2042
March	1st to 10th	Night	4 9% 4 12% 7% 6% 6% 5% 7% 9% 32%	5376
	11th to 20th	Night	4 9% 4 10% 6% 6% 6% 6% 8% 10% 30%	5054
	21st to end	Night	8% 18% 7% 15% 6% 5% 5% 4 5% 7% 21%	5386
April	1st to 10th	Night	8% 12% 4 10% 6% 5% 5% 5% 6% 8% 31%	1931
	11th to 20th	Night	8% 13% 5% 11% 7% 6% 6% 4 5% 8% 28%	1781
	21st to end	Night	11% 9% 3 9% 7% 6% 5% 5% 7% 8% 31%	1800
May	1st to 10th	Night	16% 10% 3 8% 4 4 4 3 5% 7% 35%	3582
	11th to 20th	Night	14% 10% 4 8% 6% 6% 6% 5% 6% 8% 27%	3159
	21st to end	Night	13% 8% 3 9% 6% 5% 5% 5% 7% 7% 32%	3470
June	1st to 10th	Night	15% 9% 4 8% 7% 5% 5% 5% 7% 8% 27%	1400
	11th to 20th	Night	18% 9% 3 10% 7% 6% 7% 4 6% 7% 24%	1400
	21st to end	Night	10% 7% 2 6% 6% 5% 6% 5% 7% 9% 37%	1400
July	1st to 10th	Night	8% 6% 2 8% 6% 5% 6% 4 6% 8% 40%	3180
	11th to 20th	Night	9% 5% 2 7% 4 4 5% 4 7% 10% 44%	3180
	21st to end	Night	11% 6% 2 5% 3 4 5% 4 6% 10% 44%	3508
August	1st to 10th	Night	12% 7% 2 6% 4 4 4 4 5% 8% 43%	2609
	11th to 20th	Night	8% 6% 2 7% 5% 5% 5% 4 7% 12% 39%	2807
	21st to end	Night	10% 5% 2 6% 4 5% 5% 4 7% 8% 46%	3245
September	1st to 10th	Night	9% 5% 2 7% 3 4 5% 3 6% 9% 46%	1895
	11th to 20th	Night	15% 7% 3 5% 4 4 4 3 6% 6% 43%	2200
	21st to end	Night	8% 7% 2 7% 4 4 5% 4 6% 8% 45%	2200
October	1st to 10th	Night	7% 7% 2 7% 4 5% 5% 5% 7% 8% 44%	3753
	11th to 20th	Night	6% 9% 3 8% 4 4 5% 4 7% 9% 41%	4168
	21st to end	Night	6% 9% 3 8% 6% 6% 6% 4 7% 8% 39%	4600
November	1st to 10th	Night	9% 15% 5% 9% 5% 5% 5% 4 6% 7% 31%	2810
	11th to 20th	Night	5% 11% 5% 10% 7% 6% 6% 5% 7% 8% 31%	3061
	21st to end	Night	4 11% 4 11% 6% 6% 6% 4 7% 9% 31%	3150
December	1st to 10th	Night	7% 14% 5% 12% 7% 6% 5% 4 6% 7% 27%	5040
	11th to 20th	Night	5% 13% 5% 13% 8% 7% 6% 5% 7% 8% 23%	5700
	21st to end	Night	2 9% 4 10% 6% 5% 5% 4 6% 8% 41%	7623

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	53% 6% 9% 20% 11% 1	3249
	11th to 20th	Day	47% 6% 11% 14% 18% 4	3222
	21st to end	Day	40% 5% 14% 31% 10%	3972
February	1st to 10th	Day	52% 7% 12% 17% 10% 2	1600
	11th to 20th	Day	54% 7% 13% 16% 9% 2	1729
	21st to end	Day	51% 8% 11% 18% 11% 1	1585
March	1st to 10th	Day	44% 5% 15% 23% 14%	4518
	11th to 20th	Day	43% 7% 13% 22% 15% 1	4946
	21st to end	Day	62% 6% 10% 15% 7%	5573
April	1st to 10th	Day	49% 9% 15% 19% 8%	2468
	11th to 20th	Day	52% 7% 10% 21% 10% 1	2570
	21st to end	Day	49% 7% 13% 24% 7% 1	2600
May	1st to 10th	Day	44% 6% 9% 24% 15% 1	6379
	11th to 20th	Day	51% 8% 13% 21% 7%	6738
	21st to end	Day	43% 8% 15% 24% 9% 1	7406
June	1st to 10th	Day	47% 8% 15% 21% 8% 1	3000
	11th to 20th	Day	53% 9% 13% 19% 5% 1	3000
	21st to end	Day	38% 10% 20% 25% 6% 1	3000
July	1st to 10th	Day	29% 7% 18% 32% 11% 2	6706
	11th to 20th	Day	35% 7% 21% 30% 7%	6699
	21st to end	Day	34% 8% 18% 27% 11% 2	7125
August	1st to 10th	Day	37% 9% 18% 29% 7%	4524
	11th to 20th	Day	32% 9% 25% 26% 7% 1	4289
	21st to end	Day	31% 7% 22% 30% 9% 1	4663
September	1st to 10th	Day	35% 7% 19% 26% 10% 3	2501
	11th to 20th	Day	38% 6% 14% 30% 11% 1	2200
	21st to end	Day	37% 7% 17% 25% 11% 3	2200
October	1st to 10th	Day	38% 6% 20% 29% 6% 1	3441
	11th to 20th	Day	41% 7% 17% 21% 13% 2	2979
	21st to end	Day	42% 6% 10% 33% 9% 1	3200
November	1st to 10th	Day	53% 7% 11% 19% 8% 2	1686
	11th to 20th	Day	49% 7% 12% 21% 10% 1	1556
	21st to end	Day	50% 6% 15% 18% 9% 2	1470
December	1st to 10th	Day	54% 6% 16% 18% 6% 1	2360
	11th to 20th	Day	53% 8% 16% 18% 4 1	2714
	21st to end	Day	40% 5% 10% 24% 17% 3	3575
January	1st to 10th	Night	55% 7% 11% 19% 7% 2	6916
	11th to 20th	Night	49% 5% 12% 16% 14% 4	6871
	21st to end	Night	41% 6% 16% 26% 10% 1	7026
February	1st to 10th	Night	55% 5% 10% 18% 11% 1	2800
	11th to 20th	Night	53% 5% 12% 17% 11% 2	2568
	21st to end	Night	47% 5% 12% 22% 12% 2	2042
March	1st to 10th	Night	45% 6% 15% 21% 12% 1	5376
	11th to 20th	Night	44% 9% 15% 20% 11% 1	5054
	21st to end	Night	62% 7% 8% 15% 7% 1	5386
April	1st to 10th	Night	49% 7% 12% 19% 12%	1931
	11th to 20th	Night	53% 6% 11% 20% 9% 1	1781
	21st to end	Night	49% 8% 12% 23% 7% 2	1800
May	1st to 10th	Night	47% 5% 9% 22% 14% 3	3579
	11th to 20th	Night	50% 9% 14% 20% 7%	3159
	21st to end	Night	46% 9% 15% 21% 7% 1	3470
June	1st to 10th	Night	51% 9% 13% 18% 8% 1	1400
	11th to 20th	Night	56% 9% 12% 17% 5% 2	1400
	21st to end	Night	39% 9% 20% 23% 7% 1	1400
July	1st to 10th	Night	38% 9% 15% 24% 11% 2	3145
	11th to 20th	Night	33% 8% 21% 30% 5% 3	3138
	21st to end	Night	33% 9% 21% 26% 11% 1	3410
August	1st to 10th	Night	38% 8% 16% 30% 8%	2601
	11th to 20th	Night	35% 9% 23% 27% 5% 1	2832
	21st to end	Night	32% 9% 20% 30% 8% 1	3245
September	1st to 10th	Night	33% 8% 15% 28% 13% 4	1895
	11th to 20th	Night	39% 8% 14% 26% 11% 3	2200
	21st to end	Night	35% 6% 16% 26% 14% 3	2200
October	1st to 10th	Night	35% 6% 19% 27% 13% 1	3753
	11th to 20th	Night	38% 6% 17% 28% 10% 1	4168
	21st to end	Night	41% 6% 14% 30% 9% 1	4600
November	1st to 10th	Night	51% 6% 10% 21% 9% 2	2810
	11th to 20th	Night	48% 7% 15% 18% 11% 1	3061
	21st to end	Night	47% 7% 16% 20% 8% 3	3150
December	1st to 10th	Night	55% 5% 15% 16% 6% 1	5040
	11th to 20th	Night	57% 7% 15% 15% 6%	5697
	21st to end	Night	40% 4 9% 26% 16% 4	7623

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	5% 5% 26% 33% 20% 9%	220
	11th to 20th	Day	8% 4 33% 35% 14% 6%	212
	21st to end	Day	8% 7% 25% 31% 20% 8%	220
February	1st to 10th	Day	9% 12% 17% 42% 15% 7%	200
	11th to 20th	Day	8% 6% 25% 40% 17% 5%	283
	21st to end	Day	5% 5% 24% 40% 19% 7%	349
March	1st to 10th	Day	8% 7% 26% 35% 18% 5%	500
	11th to 20th	Day	6% 4 26% 37% 19% 7%	500
	21st to end	Day	14% 6% 24% 32% 17% 7%	550
April	1st to 10th	Day	10% 10% 27% 32% 15% 5%	500
	11th to 20th	Day	16% 9% 24% 28% 17% 5%	492
	21st to end	Day	16% 8% 22% 31% 18% 5%	500
May	1st to 10th	Day	15% 8% 25% 29% 17% 6%	586
	11th to 20th	Day	12% 8% 22% 33% 18% 6%	725
	21st to end	Day	17% 5% 17% 32% 22% 8%	789
June	1st to 10th	Day	15% 8% 23% 34% 16% 4	730
	11th to 20th	Day	20% 10% 19% 31% 17% 4	730
	21st to end	Day	12% 5% 19% 31% 22% 10%	730
July	1st to 10th	Day	13% 5% 15% 33% 23% 11%	721
	11th to 20th	Day	14% 3 18% 32% 25% 8%	718
	21st to end	Day	9% 5% 17% 31% 28% 11%	774
August	1st to 10th	Day	11% 4 22% 30% 23% 9%	527
	11th to 20th	Day	8% 5% 20% 34% 27% 6%	517
	21st to end	Day	11% 6% 17% 31% 25% 10%	583
September	1st to 10th	Day	12% 4 27% 28% 21% 7%	530
	11th to 20th	Day	19% 5% 20% 27% 22% 7%	530
	21st to end	Day	12% 8% 33% 25% 16% 5%	530
October	1st to 10th	Day	16% 7% 24% 28% 17% 9%	436
	11th to 20th	Day	10% 9% 30% 30% 16% 5%	330
	21st to end	Day	13% 10% 30% 33% 12% 2	363
November	1st to 10th	Day	17% 5% 24% 36% 14% 4	330
	11th to 20th	Day	12% 7% 27% 38% 14% 2	264
	21st to end	Day	6% 6% 30% 33% 16% 9%	220
December	1st to 10th	Day	14% 4 25% 33% 19% 5%	220
	11th to 20th	Day	9% 8% 39% 25% 16% 3	220
	21st to end	Day	7% 6% 22% 34% 24% 7%	242
January	1st to 10th	Night	10% 6% 31% 36% 15% 2	1050
	11th to 20th	Night	12% 7% 31% 36% 13% 1	1031
	21st to end	Night	10% 9% 28% 39% 11% 2	915
February	1st to 10th	Night	11% 7% 26% 38% 17% 2	800
	11th to 20th	Night	10% 6% 31% 38% 14% 1	784
	21st to end	Night	8% 4 24% 38% 21% 5%	660
March	1st to 10th	Night	9% 4 29% 40% 16% 2	800
	11th to 20th	Night	9% 3 28% 43% 14% 3	800
	21st to end	Night	13% 5% 25% 40% 14% 3	880
April	1st to 10th	Night	13% 6% 29% 33% 17% 2	731
	11th to 20th	Night	13% 8% 28% 40% 10% 1	593
	21st to end	Night	14% 8% 27% 36% 13% 1	600
May	1st to 10th	Night	19% 7% 24% 35% 13% 2	466
	11th to 20th	Night	14% 7% 26% 37% 16% 1	394
	21st to end	Night	21% 5% 19% 36% 17% 2	433
June	1st to 10th	Night	20% 8% 25% 32% 13% 3	400
	11th to 20th	Night	19% 5% 23% 34% 18% 1	400
	21st to end	Night	14% 4 21% 38% 22% 2	400
July	1st to 10th	Night	13% 3 13% 47% 23% 1	390
	11th to 20th	Night	13% 2 19% 43% 23% 1	388
	21st to end	Night	9% 4 15% 41% 29% 2	438
August	1st to 10th	Night	12% 2 15% 37% 32% 2	398
	11th to 20th	Night	10% 5% 15% 44% 24% 2	536
	21st to end	Night	12% 4 19% 44% 22%	660
September	1st to 10th	Night	12% 3 20% 46% 18% 2	686
	11th to 20th	Night	16% 5% 18% 39% 22% 1	800
	21st to end	Night	12% 4 29% 39% 16% 1	800
October	1st to 10th	Night	14% 4 25% 39% 16% 2	800
	11th to 20th	Night	12% 7% 28% 38% 15% 1	800
	21st to end	Night	11% 9% 32% 36% 12% 1	880
November	1st to 10th	Night	16% 7% 32% 33% 11% 2	965
	11th to 20th	Night	10% 7% 36% 34% 10% 2	1050
	21st to end	Night	9% 5% 35% 37% 12% 2	1050
December	1st to 10th	Night	13% 7% 28% 34% 14% 3	1050
	11th to 20th	Night	9% 7% 33% 37% 13% 1	1050
	21st to end	Night	10% 5% 30% 37% 15% 3	1155

Page generated at 2026-01-13 23:14:24. Version ac07

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