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 2024-06-17.

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	10% 10% 4 8% 6% 5% 5% 4 6% 8% 34%	89235
	Night	7% 10% 4 10% 6% 5% 6% 4 6% 8% 33%	89661
Transparency	Day	46% 8% 15% 22% 9% 1	88939
	Night	47% 7% 14% 21% 9% 2	89538
Seeing	Day	13% 6% 23% 32% 20% 7%	14824
	Night	12% 5% 26% 38% 16% 2	23958

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% 10% 3 8% 6% 6% 5% 4 6% 8% 25%	2794
	21st to end	Day	10% 6% 2 6% 5% 5% 5% 5% 8% 10% 37%	2700
July	1st to 10th	Day	10% 6% 2 7% 4 5% 5% 4 7% 9% 39%	2700
	11th to 20th	Day	12% 6% 2 5% 4 5% 5% 4 7% 9% 40%	2700
	21st to end	Day	8% 4 2 5% 4 4 5% 4 7% 10% 47%	2920
August	1st to 10th	Day	10% 6% 2 5% 4 4 5% 4 7% 11% 41%	2507
	11th to 20th	Day	9% 4 1 5% 4 4 5% 4 7% 9% 47%	2350
	21st to end	Day	11% 5% 2 5% 4 4 6% 4 7% 7% 44%	2574
September	1st to 10th	Day	12% 6% 2 7% 4 4 4 4 6% 8% 43%	2253
	11th to 20th	Day	15% 8% 2 6% 3 4 4 3 5% 7% 44%	1980
	21st to end	Day	9% 8% 3 6% 4 5% 5% 4 6% 9% 42%	1980
October	1st to 10th	Day	11% 11% 4 6% 5% 5% 4 4 5% 7% 39%	1896
	11th to 20th	Day	10% 9% 3 8% 5% 5% 4 4 7% 7% 38%	1652
	21st to end	Day	7% 11% 5% 9% 6% 6% 6% 4 6% 7% 33%	1782
November	1st to 10th	Day	7% 17% 5% 10% 7% 5% 5% 4 6% 7% 28%	1523
	11th to 20th	Day	7% 14% 5% 9% 6% 4 6% 4 5% 6% 34%	1408
	21st to end	Day	6% 12% 3 11% 7% 6% 5% 3 6% 9% 32%	1330
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	19% 9% 3 9% 7% 6% 7% 4 6% 7% 24%	1309
	21st to end	Night	9% 7% 2 6% 6% 6% 6% 5% 7% 9% 37%	1260
July	1st to 10th	Night	10% 5% 2 7% 6% 5% 5% 5% 6% 10% 39%	1260
	11th to 20th	Night	9% 5% 2 9% 5% 4 6% 5% 8% 9% 38%	1260
	21st to end	Night	7% 5% 2 5% 3 4 5% 5% 7% 9% 48%	1393
August	1st to 10th	Night	9% 5% 3 7% 5% 5% 4 4 6% 10% 41%	1432
	11th to 20th	Night	9% 6% 2 6% 5% 4 4 4 6% 10% 42%	1550
	21st to end	Night	9% 5% 2 6% 4 4 5% 4 7% 8% 44%	1782
September	1st to 10th	Night	10% 6% 2 7% 3 5% 5% 3 6% 9% 44%	1703
	11th to 20th	Night	15% 7% 3 5% 4 4 4 3 6% 7% 41%	1980
	21st to end	Night	8% 8% 2 7% 4 4 5% 4 7% 7% 45%	1980
October	1st to 10th	Night	11% 9% 3 7% 5% 5% 5% 4 6% 7% 40%	2063
	11th to 20th	Night	7% 10% 3 9% 6% 5% 5% 4 7% 8% 37%	2307
	21st to end	Night	6% 11% 4 9% 6% 5% 5% 4 8% 8% 33%	2574
November	1st to 10th	Night	9% 16% 4 9% 5% 4 5% 4 6% 7% 31%	2536
	11th to 20th	Night	5% 12% 5% 10% 7% 5% 5% 5% 6% 8% 31%	2769
	21st to end	Night	4 11% 4 11% 6% 6% 6% 4 7% 10% 32%	2850
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	55% 9% 12% 17% 5% 1	2794
	21st to end	Day	39% 11% 19% 25% 6% 1	2700
July	1st to 10th	Day	37% 10% 21% 24% 6% 1	2626
	11th to 20th	Day	38% 9% 23% 24% 6%	2619
	21st to end	Day	30% 10% 23% 30% 7%	2758
August	1st to 10th	Day	35% 10% 22% 26% 6%	2490
	11th to 20th	Day	31% 9% 25% 25% 8% 1	2350
	21st to end	Day	34% 9% 20% 26% 10% 1	2574
September	1st to 10th	Day	37% 8% 19% 24% 9% 3	2253
	11th to 20th	Day	40% 6% 14% 29% 11% 1	1980
	21st to end	Day	38% 7% 18% 24% 11% 2	1980
October	1st to 10th	Day	44% 5% 16% 24% 9% 1	1896
	11th to 20th	Day	44% 8% 15% 22% 10% 1	1652
	21st to end	Day	48% 8% 11% 21% 11% 1	1782
November	1st to 10th	Day	54% 8% 11% 18% 8% 2	1523
	11th to 20th	Day	49% 7% 12% 21% 10% 1	1408
	21st to end	Day	48% 6% 16% 19% 9% 2	1330
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	1309
	21st to end	Night	40% 10% 19% 23% 7% 1	1260
July	1st to 10th	Night	38% 11% 20% 25% 5% 1	1225
	11th to 20th	Night	38% 13% 22% 20% 7% 1	1218
	21st to end	Night	28% 11% 21% 29% 10% 1	1316
August	1st to 10th	Night	37% 11% 21% 24% 6%	1424
	11th to 20th	Night	36% 8% 21% 28% 7% 1	1550
	21st to end	Night	34% 10% 17% 26% 12% 2	1782
September	1st to 10th	Night	35% 8% 15% 27% 12% 3	1703
	11th to 20th	Night	39% 8% 14% 25% 10% 4	1980
	21st to end	Night	36% 6% 16% 25% 14% 3	1980
October	1st to 10th	Night	42% 6% 16% 23% 12% 1	2063
	11th to 20th	Night	43% 7% 16% 23% 10% 2	2307
	21st to end	Night	46% 7% 16% 21% 9% 1	2574
November	1st to 10th	Night	51% 6% 11% 21% 10% 2	2536
	11th to 20th	Night	48% 7% 15% 18% 12% 1	2769
	21st to end	Night	46% 7% 17% 20% 8% 3	2850
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	21% 10% 19% 32% 15% 4	662
	21st to end	Day	12% 5% 20% 30% 22% 11%	630
July	1st to 10th	Day	14% 4 16% 32% 23% 11%	621
	11th to 20th	Day	14% 3 19% 33% 24% 6%	618
	21st to end	Day	8% 5% 18% 32% 28% 10%	666
August	1st to 10th	Day	12% 4 22% 30% 22% 9%	447
	11th to 20th	Day	9% 5% 18% 34% 28% 6%	437
	21st to end	Day	12% 6% 18% 30% 24% 10%	495
September	1st to 10th	Day	14% 4 30% 29% 19% 4	450
	11th to 20th	Day	20% 6% 22% 28% 20% 5%	450
	21st to end	Day	14% 8% 30% 24% 18% 6%	450
October	1st to 10th	Day	17% 7% 23% 27% 16% 10%	366
	11th to 20th	Day	11% 9% 30% 28% 17% 6%	270
	21st to end	Day	13% 9% 31% 31% 14% 2	297
November	1st to 10th	Day	18% 4 21% 39% 13% 5%	270
	11th to 20th	Day	13% 6% 26% 37% 14% 2	216
	21st to end	Day	6% 7% 28% 34% 16% 10%	180
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	21% 5% 23% 33% 18% 1	374
	21st to end	Night	14% 3 20% 40% 22% 2	360
July	1st to 10th	Night	14% 3 12% 47% 23% 1	350
	11th to 20th	Night	13% 2 20% 41% 23% 1	348
	21st to end	Night	9% 4 15% 42% 28% 3	394
August	1st to 10th	Night	11% 2 15% 37% 33% 2	358
	11th to 20th	Night	11% 5% 14% 44% 24% 2	482
	21st to end	Night	12% 4 19% 43% 22% 1	594
September	1st to 10th	Night	13% 3 20% 45% 17% 2	616
	11th to 20th	Night	17% 5% 18% 38% 21% 1	720
	21st to end	Night	12% 3 27% 39% 17% 1	720
October	1st to 10th	Night	15% 4 24% 39% 16% 2	720
	11th to 20th	Night	12% 6% 28% 38% 15% 1	720
	21st to end	Night	11% 8% 31% 37% 12% 1	792
November	1st to 10th	Night	16% 6% 31% 34% 12% 2	871
	11th to 20th	Night	11% 7% 37% 33% 10% 2	950
	21st to end	Night	8% 5% 36% 37% 12% 2	950
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 2024-06-14 11:06:12. Version ac07

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