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 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	9% 9% 3 8% 5% 5% 5% 4 6% 8% 36%	105835
	Night	7% 10% 4 9% 6% 5% 5% 4 6% 8% 34%	102208
Transparency	Day	43% 7% 15% 24% 9% 1	105580
	Night	45% 7% 14% 22% 10% 2	102110
Seeing	Day	13% 6% 23% 32% 20% 7%	15450
	Night	12% 5% 26% 38% 16% 2	24485

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 12% 6% 14% 6% 5% 5% 5% 6% 8% 32%	2219
	11th to 20th	Day	4 9% 5% 9% 6% 6% 7% 6% 9% 8% 31%	2199
	21st to end	Day	4 10% 4 9% 6% 7% 5% 4 6% 8% 38%	2762
February	1st to 10th	Day	6% 15% 5% 9% 6% 5% 6% 5% 6% 9% 27%	1520
	11th to 20th	Day	5% 14% 5% 12% 6% 8% 6% 5% 6% 7% 26%	1631
	21st to end	Day	3 12% 6% 12% 8% 6% 7% 6% 6% 8% 26%	1508
March	1st to 10th	Day	3 12% 6% 15% 9% 6% 6% 4 5% 7% 28%	3138
	11th to 20th	Day	5% 10% 3 7% 5% 4 5% 4 8% 9% 42%	3448
	21st to end	Day	8% 22% 6% 13% 5% 5% 4 3 4 6% 24%	3886
April	1st to 10th	Day	8% 13% 4 8% 7% 5% 6% 4 6% 7% 30%	2344
	11th to 20th	Day	12% 14% 4 9% 6% 5% 5% 4 5% 7% 29%	2440
	21st to end	Day	12% 12% 4 8% 6% 4 5% 4 6% 9% 31%	2470
May	1st to 10th	Day	19% 12% 3 8% 5% 5% 5% 4 6% 6% 28%	4462
	11th to 20th	Day	10% 10% 4 9% 6% 5% 6% 4 7% 9% 29%	4694
	21st to end	Day	17% 10% 3 8% 6% 6% 6% 4 7% 8% 26%	5161
June	1st to 10th	Day	15% 7% 2 7% 6% 6% 6% 5% 7% 8% 30%	2850
	11th to 20th	Day	19% 9% 3 8% 6% 6% 5% 4 6% 8% 25%	2850
	21st to end	Day	10% 6% 2 6% 5% 5% 5% 5% 8% 10% 37%	2850
July	1st to 10th	Day	9% 4 2 6% 3 4 4 4 6% 8% 50%	4740
	11th to 20th	Day	8% 4 2 4 3 4 5% 4 7% 10% 48%	4740
	21st to end	Day	7% 4 2 5% 4 4 5% 4 6% 10% 50%	5107
August	1st to 10th	Day	9% 6% 2 6% 5% 5% 5% 4 7% 9% 41%	4401
	11th to 20th	Day	7% 5% 2 5% 5% 4 6% 5% 8% 12% 41%	4115
	21st to end	Day	11% 5% 2 5% 4 4 5% 4 6% 8% 47%	4521
September	1st to 10th	Day	11% 6% 2 6% 4 4 4 4 6% 8% 45%	2377
	11th to 20th	Day	16% 8% 2 6% 3 4 4 3 5% 7% 44%	2090
	21st to end	Day	9% 8% 3 6% 4 5% 5% 4 6% 9% 42%	2090
October	1st to 10th	Day	7% 8% 4 7% 5% 5% 5% 5% 6% 10% 39%	3336
	11th to 20th	Day	7% 8% 3 8% 5% 6% 5% 4 7% 10% 37%	2887
	21st to end	Day	7% 8% 4 8% 6% 5% 5% 4 6% 6% 40%	3101
November	1st to 10th	Day	7% 16% 5% 10% 7% 5% 5% 4 6% 7% 28%	1604
	11th to 20th	Day	6% 14% 4 9% 6% 4 6% 4 5% 6% 34%	1482
	21st to end	Day	6% 12% 4 11% 7% 6% 5% 3 6% 8% 32%	1358
December	1st to 10th	Day	5% 15% 5% 12% 8% 6% 4 4 5% 7% 29%	1330
	11th to 20th	Day	4 10% 5% 13% 8% 7% 5% 5% 7% 8% 28%	1682
	21st to end	Day	3 8% 5% 9% 5% 5% 5% 4 5% 8% 42%	2442
January	1st to 10th	Night	4 12% 6% 13% 8% 7% 6% 5% 6% 7% 26%	4726
	11th to 20th	Night	3 10% 4 12% 7% 6% 7% 6% 6% 8% 31%	4699
	21st to end	Night	4 12% 4 10% 6% 5% 6% 5% 7% 8% 32%	4922
February	1st to 10th	Night	6% 14% 5% 12% 7% 6% 6% 4 6% 8% 27%	2660
	11th to 20th	Night	5% 14% 5% 11% 7% 8% 7% 5% 6% 7% 27%	2436
	21st to end	Night	3 12% 4 10% 7% 6% 6% 5% 7% 8% 32%	1943
March	1st to 10th	Night	3 9% 4 16% 8% 8% 7% 5% 7% 8% 24%	3736
	11th to 20th	Night	6% 8% 3 8% 6% 5% 6% 6% 8% 10% 35%	3531
	21st to end	Night	6% 18% 8% 15% 7% 5% 5% 4 5% 6% 19%	3751
April	1st to 10th	Night	8% 12% 4 10% 7% 5% 5% 5% 6% 8% 29%	1835
	11th to 20th	Night	8% 13% 5% 11% 7% 6% 6% 4 5% 8% 28%	1691
	21st to end	Night	11% 9% 3 9% 6% 6% 5% 5% 7% 8% 31%	1710
May	1st to 10th	Night	22% 12% 3 9% 4 4 4 3 4 6% 28%	2496
	11th to 20th	Night	12% 9% 3 7% 6% 6% 6% 5% 7% 9% 32%	2199
	21st to end	Night	17% 10% 4 10% 7% 6% 5% 5% 8% 7% 21%	2414
June	1st to 10th	Night	15% 9% 4 8% 6% 5% 5% 5% 7% 8% 27%	1330
	11th to 20th	Night	18% 9% 3 9% 7% 6% 7% 4 6% 7% 24%	1330
	21st to end	Night	9% 7% 2 6% 6% 5% 6% 5% 7% 9% 37%	1330
July	1st to 10th	Night	9% 5% 2 8% 6% 5% 5% 4 5% 8% 41%	2220
	11th to 20th	Night	5% 3 2 6% 4 3 5% 5% 8% 11% 49%	2220
	21st to end	Night	7% 6% 2 5% 3 4 5% 4 7% 10% 48%	2441
August	1st to 10th	Night	12% 7% 2 6% 4 4 4 4 5% 8% 44%	2529
	11th to 20th	Night	8% 6% 2 6% 5% 5% 5% 4 7% 12% 39%	2720
	21st to end	Night	10% 5% 2 6% 4 5% 5% 4 7% 8% 45%	3146
September	1st to 10th	Night	10% 6% 3 7% 3 4 5% 3 6% 9% 45%	1799
	11th to 20th	Night	15% 7% 3 5% 4 4 4 3 6% 7% 41%	2090
	21st to end	Night	8% 7% 2 7% 4 4 5% 4 7% 8% 45%	2090
October	1st to 10th	Night	7% 7% 3 7% 4 5% 5% 4 7% 8% 44%	3638
	11th to 20th	Night	6% 9% 3 8% 5% 4 5% 4 7% 9% 41%	4040
	21st to end	Night	6% 9% 3 8% 6% 6% 6% 4 7% 8% 39%	4457
November	1st to 10th	Night	9% 16% 4 9% 5% 5% 5% 4 6% 7% 31%	2673
	11th to 20th	Night	5% 12% 5% 10% 7% 6% 6% 5% 6% 9% 30%	2915
	21st to end	Night	4 11% 4 12% 6% 5% 6% 4 7% 10% 31%	2917
December	1st to 10th	Night	6% 12% 4 11% 7% 6% 5% 4 6% 7% 33%	2850
	11th to 20th	Night	3 10% 5% 12% 8% 7% 7% 5% 7% 8% 29%	3510
	21st to end	Night	3 9% 4 9% 5% 5% 4 4 6% 8% 44%	5214

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	50% 5% 11% 22% 11% 1	2219
	11th to 20th	Day	46% 7% 10% 15% 18% 4	2220
	21st to end	Day	42% 6% 14% 30% 8% 1	2762
February	1st to 10th	Day	51% 8% 12% 17% 10% 2	1520
	11th to 20th	Day	54% 7% 13% 15% 8% 2	1640
	21st to end	Day	52% 8% 11% 17% 11% 1	1508
March	1st to 10th	Day	54% 6% 14% 16% 10%	3138
	11th to 20th	Day	37% 8% 17% 23% 14% 1	3449
	21st to end	Day	62% 5% 10% 15% 7%	3886
April	1st to 10th	Day	50% 9% 15% 18% 8%	2344
	11th to 20th	Day	53% 7% 10% 21% 9%	2440
	21st to end	Day	49% 7% 13% 23% 7% 1	2470
May	1st to 10th	Day	54% 7% 10% 23% 6%	4462
	11th to 20th	Day	47% 9% 13% 23% 9%	4698
	21st to end	Day	52% 10% 14% 17% 6% 1	5162
June	1st to 10th	Day	48% 9% 15% 21% 7% 1	2850
	11th to 20th	Day	54% 9% 12% 18% 5% 1	2850
	21st to end	Day	38% 10% 19% 25% 6% 1	2850
July	1st to 10th	Day	30% 7% 17% 31% 13% 3	4666
	11th to 20th	Day	29% 8% 20% 35% 9%	4659
	21st to end	Day	28% 8% 16% 29% 15% 3	4946
August	1st to 10th	Day	37% 8% 18% 29% 8%	4384
	11th to 20th	Day	32% 9% 25% 26% 7% 1	4156
	21st to end	Day	32% 7% 23% 29% 8% 1	4520
September	1st to 10th	Day	36% 8% 19% 24% 11% 4	2377
	11th to 20th	Day	40% 6% 14% 29% 10% 1	2090
	21st to end	Day	37% 7% 17% 25% 11% 3	2090
October	1st to 10th	Day	38% 6% 20% 28% 6% 1	3336
	11th to 20th	Day	41% 7% 17% 21% 12% 2	2887
	21st to end	Day	42% 6% 10% 33% 9% 1	3101
November	1st to 10th	Day	53% 8% 11% 18% 8% 2	1604
	11th to 20th	Day	49% 6% 11% 21% 11% 1	1482
	21st to end	Day	49% 6% 16% 18% 9% 2	1358
December	1st to 10th	Day	54% 6% 11% 16% 10% 2	1330
	11th to 20th	Day	50% 8% 16% 20% 5% 1	1684
	21st to end	Day	39% 5% 10% 22% 19% 5%	2442
January	1st to 10th	Night	54% 7% 11% 19% 8% 2	4726
	11th to 20th	Night	50% 5% 10% 16% 14% 5%	4740
	21st to end	Night	46% 7% 14% 23% 10% 1	4922
February	1st to 10th	Night	54% 5% 10% 19% 10% 1	2660
	11th to 20th	Night	53% 6% 13% 16% 10% 2	2437
	21st to end	Night	47% 5% 12% 22% 12% 2	1943
March	1st to 10th	Night	53% 7% 9% 21% 9% 1	3736
	11th to 20th	Night	40% 10% 18% 19% 12% 1	3531
	21st to end	Night	63% 8% 9% 14% 5% 1	3751
April	1st to 10th	Night	50% 8% 12% 19% 11%	1835
	11th to 20th	Night	53% 6% 11% 20% 8% 1	1691
	21st to end	Night	49% 8% 13% 22% 7% 2	1710
May	1st to 10th	Night	56% 6% 10% 22% 6%	2496
	11th to 20th	Night	43% 9% 13% 25% 10%	2199
	21st to end	Night	56% 11% 14% 14% 4 1	2414
June	1st to 10th	Night	51% 9% 13% 18% 8% 1	1330
	11th to 20th	Night	56% 9% 12% 17% 5% 2	1330
	21st to end	Night	39% 9% 20% 23% 8% 1	1330
July	1st to 10th	Night	39% 9% 14% 23% 12% 2	2185
	11th to 20th	Night	25% 10% 20% 34% 7% 4	2178
	21st to end	Night	29% 8% 16% 31% 15% 1	2364
August	1st to 10th	Night	38% 8% 15% 30% 8%	2521
	11th to 20th	Night	35% 9% 23% 27% 5% 1	2745
	21st to end	Night	33% 9% 20% 29% 8% 1	3146
September	1st to 10th	Night	34% 8% 15% 27% 13% 4	1799
	11th to 20th	Night	40% 8% 14% 25% 10% 3	2090
	21st to end	Night	36% 6% 16% 25% 14% 3	2090
October	1st to 10th	Night	35% 6% 18% 27% 13% 1	3638
	11th to 20th	Night	38% 6% 17% 28% 9% 1	4040
	21st to end	Night	41% 6% 14% 30% 9% 1	4457
November	1st to 10th	Night	51% 6% 11% 21% 9% 2	2673
	11th to 20th	Night	48% 7% 14% 18% 11% 1	2915
	21st to end	Night	47% 7% 16% 19% 7% 3	2917
December	1st to 10th	Night	50% 6% 11% 19% 11% 3	2850
	11th to 20th	Night	50% 8% 14% 20% 6% 1	3507
	21st to end	Night	38% 5% 11% 26% 14% 6%	5214

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	6% 3 25% 33% 22% 11%	180
	11th to 20th	Day	8% 2 33% 35% 16% 7%	180
	21st to end	Day	8% 7% 25% 30% 22% 9%	198
February	1st to 10th	Day	9% 12% 16% 41% 15% 7%	180
	11th to 20th	Day	9% 5% 23% 42% 17% 5%	254
	21st to end	Day	6% 4 24% 40% 19% 8%	320
March	1st to 10th	Day	8% 8% 27% 35% 17% 5%	460
	11th to 20th	Day	6% 4 26% 38% 20% 7%	460
	21st to end	Day	13% 6% 24% 32% 16% 8%	506
April	1st to 10th	Day	10% 10% 28% 32% 14% 5%	460
	11th to 20th	Day	16% 8% 24% 28% 18% 6%	452
	21st to end	Day	16% 8% 22% 32% 17% 4	460
May	1st to 10th	Day	16% 8% 23% 29% 18% 6%	542
	11th to 20th	Day	12% 8% 22% 33% 19% 6%	675
	21st to end	Day	18% 5% 16% 31% 23% 8%	734
June	1st to 10th	Day	16% 8% 23% 34% 16% 4	680
	11th to 20th	Day	20% 10% 19% 31% 16% 4	680
	21st to end	Day	12% 5% 21% 31% 22% 10%	680
July	1st to 10th	Day	14% 4 15% 32% 24% 11%	671
	11th to 20th	Day	13% 3 17% 33% 25% 8%	668
	21st to end	Day	8% 5% 18% 31% 28% 11%	720
August	1st to 10th	Day	11% 5% 22% 31% 22% 9%	487
	11th to 20th	Day	8% 5% 18% 34% 29% 6%	477
	21st to end	Day	12% 7% 18% 31% 23% 9%	539
September	1st to 10th	Day	13% 4 29% 28% 20% 6%	490
	11th to 20th	Day	21% 5% 21% 27% 20% 6%	490
	21st to end	Day	13% 9% 31% 24% 18% 6%	490
October	1st to 10th	Day	16% 7% 25% 27% 16% 9%	401
	11th to 20th	Day	10% 9% 30% 29% 16% 6%	300
	21st to end	Day	14% 9% 29% 33% 13% 3	330
November	1st to 10th	Day	17% 5% 21% 37% 15% 5%	300
	11th to 20th	Day	13% 7% 26% 36% 15% 2	240
	21st to end	Day	7% 7% 27% 34% 16% 10%	188
December	1st to 10th	Day	13% 2 24% 34% 21% 5%	180
	11th to 20th	Day	8% 6% 38% 27% 18% 3	180
	21st to end	Day	6% 6% 22% 33% 27% 6%	198
January	1st to 10th	Night	10% 6% 31% 36% 15% 2	950
	11th to 20th	Night	12% 7% 30% 37% 14% 1	950
	21st to end	Night	10% 9% 27% 39% 12% 3	870
February	1st to 10th	Night	11% 7% 27% 37% 16% 2	760
	11th to 20th	Night	10% 6% 30% 38% 15% 1	744
	21st to end	Night	9% 4 23% 38% 21% 5%	628
March	1st to 10th	Night	9% 4 29% 40% 16% 2	760
	11th to 20th	Night	9% 3 28% 42% 15% 3	760
	21st to end	Night	13% 5% 24% 40% 15% 3	836
April	1st to 10th	Night	13% 6% 29% 34% 16% 2	695
	11th to 20th	Night	13% 7% 28% 40% 11% 1	563
	21st to end	Night	14% 8% 27% 36% 13% 1	570
May	1st to 10th	Night	19% 7% 23% 34% 14% 2	443
	11th to 20th	Night	13% 6% 27% 38% 16% 1	374
	21st to end	Night	23% 5% 19% 36% 16% 2	411
June	1st to 10th	Night	20% 8% 24% 33% 13% 3	380
	11th to 20th	Night	20% 5% 24% 33% 18% 1	380
	21st to end	Night	13% 3 21% 39% 21% 2	380
July	1st to 10th	Night	14% 3 11% 47% 24% 1	370
	11th to 20th	Night	12% 2 18% 42% 24% 1	368
	21st to end	Night	9% 4 15% 41% 29% 2	416
August	1st to 10th	Night	12% 2 15% 38% 31% 2	378
	11th to 20th	Night	11% 5% 14% 44% 24% 2	509
	21st to end	Night	12% 4 19% 43% 21%	627
September	1st to 10th	Night	12% 3 20% 46% 17% 2	651
	11th to 20th	Night	17% 5% 18% 38% 21% 1	760
	21st to end	Night	12% 3 28% 40% 16% 1	760
October	1st to 10th	Night	15% 4 25% 38% 16% 2	760
	11th to 20th	Night	11% 6% 28% 39% 15% 1	760
	21st to end	Night	11% 8% 31% 37% 12% 1	836
November	1st to 10th	Night	16% 6% 31% 34% 12% 2	918
	11th to 20th	Night	11% 7% 36% 33% 10% 2	1000
	21st to end	Night	9% 5% 36% 36% 12% 2	973
December	1st to 10th	Night	13% 7% 27% 36% 15% 3	950
	11th to 20th	Night	9% 6% 32% 38% 14% 1	950
	21st to end	Night	11% 5% 29% 37% 15% 3	1045

Page generated at 2024-11-22 06:02:27. Version ac07

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